Customer Reviews

Adequate for the price.

I bought a pair of these to bridge for my turntable amp. I had not made up my mind what power amp I really wanted, so I bought these cheap Class D amps as a temporary fill in. They are ok for the price, but I don't think the advertised bridged power is anywhere near accurate. Also, they take about ten seconds to power up. I'll be selling them when I decide what I really want.

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Good power and sound

Very happy with this amp. Simply wanted a little more juice to feed my hungry speakers. Was a bit worried about a Class D amp sounding sterile but this has a nice, indistinguishable from analog sound and it provides a great soundstage and plenty of power. Using strictly for music and it delivers exactly what I wanted. May get another for running bridged or for my other system in the house...or both.

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Fun for bi-amping!

I ended up buying a used pair of Polk R700's for a verry good deal, and that made me decide I needed something better than my entry level Sony receiver and to ditch the idea of setting up surround sound and instead focus on awesome stereo. After a lot of shopping and reading and watching YouTube videos, I decided to use these, using a Yamaha WXC-50 as a DAC and streamer. My computer and PS5 are both connected to my TV via HDMI, and then I run an optical cable out of the TV and into the WXC-50, then connect the RCA out from the WXC-50 the to top amp, and then run another set of patch cables from that amp's out to the bottom amp's in. Being able to adjust the volume of each amp's left and right channels makes tweaking and dialing in the speakers a lot of fun. The cascade power is so satisfying, I just turn on my WXC-50 and then both amps click on, one then the other. Does bi-amping actually do anything? I don't know, I've never actually tested by trying one amp vs two, because it's too much work, and I mostly do it because 2 amps are cool. Bi-wiring is definitely pointless, you're just removing a speakers jumpers and using wires as jumpers instead, wires that probably don't carry the signal as well as the big metal, probably gold plated jumpers that were removed. My system sounds awesome! Playing games, watching movies, listening to music are all on a new level, the sound is incredible, sometimes emotional and moving, I like a wide variety of music and it all sounds fantastic!

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Very strong and detailed amplifier great imaging

I found this Niles si2100 to be a very fine amplifier, I reviewed a lot of amplifiers and I decided on this one and I'm happy I did, so if anyone out there on the fence, tried out you want be sorry..

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Lasted only 5 years

I thought it was a fine amplifier but after just 5 years and 4 months it stopped working. I bought it in October 2019 and now in February 2025 it just clicks and does not put out any sound. Turn it off and on and it will briefly make sound with green light on but 15 seconds later back to red light and clicking. I've never had a piece of stereo work such a short time, normally I run amplifiers for 25 years!

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Niles SI-2100

Great experience, from ordering to delivery, love the product and the support of your team is exceptional!

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Exactly what it is meant to be

This thing is awesome. Powerful, sleek, and does exactly what it says it will. I've got it paired with a Definititve ceiling speaker (Stereo input) and it delivers tons of power. Lots of room left to expand and still have enough juice to add a couple more speakers as I finish the audio buildout in my kitchen/dining area.

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SI2100 a great amp

Great value, nice sound/power

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High value power amp

Very Clean and powerful, without bells and whistles my 2.1 setup doesn't need. I have it rack mounted under a mixing board. Controls are as they should be on a power amp - a button in front to turn it on and turn it off, and separate gain controls for each channel in the back to balance for the room. All of the other control functions come from input devices. My only audio source is a Wiim Pro DAC streaming over wifi, with a hardwire input from a TV. The Wiim ouputs to a 4 pot analog equalizer, which outputs to the SA-1200. I've turned off the Wiim's equalizer because analog knobs are so much easier, and provide plenty of tonal range. Ten pots would be great, but overkill, and I can always turn the Wiim equalizer back on. I've been using two A/B single channel power amps in my other set up, which is fine, but I'm going to replace them with another one of these. Good stuff.

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Niles SI-2100

I bought this same amp a couple years ago and decided to get another because they sound very good ,2 amps 4 speakers C26 Mcintosh to control it all sounds great with Polk speakers , will probably buy another amp for a complete wall of sound as my budget allows , highly recommend Niles amps !!

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Surprising performance.

Excellent performance even compared to more expensive AB class amplifier. Operating temperature is nor very warm at all lowering my Martin Logan towers full range. Auto sense is fast as well as auto stand by. Case is light but of high quality. Wish I had heard about NILES prior to other purchases. Recommended.

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Perfect amp to run outdoor speakers

Perfect for my outdoor speakers!!!! Great power and stays very cool.

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Great!

Great amp! Sounds awesome. Runs strong and hits harder then you'd think it would.

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Equalizer solution

Bought the Niles SI-2100 to supplement my new Cambridge EVO150 in order to utilize additional speakers. The unit is being used for some Bose-901's which require a Bose equalizer. It has to be set up separately so as not to effect other speakers in my situation. Easy to hook up, set the volume to match other speakers output and turn on. Sounds great, perfect for what I needed. I'm now running up to 4 sets of speakers depending in the mood.

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Nice addition for zone 2 outdoor speakers

I bought two of these, to power two pairs of Klipsch outdoor speakers using zone 2 of a Denon receiver. They are nice, well-made units and are doing everything I hoped they would. They sound great through the Klipsch. I would definitely recommend this amp.

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Niles SI-2100

Awesome sound. Trigger switch works perfectly with no hum. Hooked this up to my Klipsch 610 RF mains through my Denon AVR 4500 . Even at 85 W per channel max this amp makes them come alive without distortion. Lightweight and powerful. Easy to configure.

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Niles SI-2100

Nice and powerful.

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Niles SI-2100

Bought two of these to bridge mono to power my front tower speakers. Amps sound great, plenty of power, clean and clear, and the auto on/off feature works great. Would definitely recommend

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Niles SI-2100

I recently added this amplifier to my home theater system, running my front left and right speakers while connected to my Marantz Cinema 60 HT receiver. I really wasn't expecting much other than adding a bit more power to my system. I was pleasantly surprised and impressed by how much more clear and detailed the sound became through my front speakers! I'm using Dali on wall speakers that tend to be more difficult to drive with a low 4ohm impedance and the Niles drives them with ease. It really brought the Dali's to life, with much more clarity and punch than they ever had driven by only my Marantz receiver. The Niles amplifier was definitely a solid addition to my system and I'd highly recommend it for anyone looking to add a bit more power and precise sound and control to their system.

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Good amp

I have two of them. I have them for almost one year. No problems at all. Just wish the price would go done a bit. I use one for surrounds and the other for my front speakers. Av receiver is Marantz SR-7015. Run four Elac UB5. Fronts are Elac DF52-BL. Also run center is also Elac. System runs strong.

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Niles SI-2100

Great power amp, very well thought out

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Niles SI-2100

staff is amazing, just getting to know the amp

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Good Clean Sound.

This is a great amp investment for a HT setup. Niles were the Custom install "go to" home theater/stereo units of the 80's. Very reliable and easy to configure, they are known to increase dynamic headroom in a current system (such as how I am using it) , which is needed in a HT setup for Cinematic appeal. It never warms to the touch, and it was an easy setup in my current system. The small footprint allows for ease of placement in tighter scenarios.**Highly Recommended and Underrated!!**

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Niles SI-2100

This little amp has it all. I love the clarity of sound it produces very detailed. Easy to fit in tight spaces if you need to, so far does not seem to get super hot when pushing it.I would definitely recommend this one for an amp to do multiple applications.

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Honest critique

I called crutchfield for assistance in adding a component to my new stereo system. One of the team listened to my concerns, my speakers were power hungry and I wanted to listen to music on lower settings. It was suggested an amplifier would push more power to them. I was told this Niles 100 watt was enuf to give more ooopmph to my system. Well it certainly does that. I have one pair of floor standing speakers hooked up to this amp,and a set of bookshelve speakers from the denon reciever. The reciever powers the bookshelf set witch gives them more power than plugging two sets in to it, and the amp does the floor set with separate power just for them. It makes a difference, as wen turned on it takes a couple seconds to engage, and the sound comes alive. Very noticeable sound difference. I'm glad I went this way. By the way, my speakers are klipsch 6000,and rp600m .I'm well pleased with this whole setup. The bookshelf speakers are nice all alone, I have them on both sides of two chairs in my music room. The floor speakers are across the room from the chairs equally spaced and I'm in stereo heaven. The most important part of this review is the team at crutchfield. Every one is very helpful. Don't delay to make a purchase at crutchfield, you'll be glad you did.

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5 stars for Niles

This replaced a vintage Harmon Kardon amp from the early 80's that finally bit the dust. The Niles sounds great and is much smaller and lighter than the old HK and does not put off as much heat.

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Niles SI-2100

Easy to install and pushes power to outdoor speakers nicely.

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Niles SI-2100

Powers my zone 2 speakers beautifully

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Niles SI-2100

Great size, runs very cool, sounds great!!

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Niles SI-2100

Plenty of power sounds good no complaints at all work as it should

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Niles SI-2100

Definitely improved system sound reproduction.

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Niles SI-2100

Happy with product . Sales help was great learned alot.

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Great solution to my power problem issue!

A great product that I added to my system, which now provides me enough audio power from my receivers, Zone 2, line level output, to power my multi-room, in-home speakers. Crutchfield consultants worked with me on my particular problem, and in selecting the Niles SI-2100 amp as a solution, and it worked great in my situation!

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Niles SI-2100

I'm not an audio engineer therefore I don't take measurements, but the unit works the way it's supposed to work. I bought it to power my two front height speakers, and thus far they're working. Simple & easy to set up.

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terrific power amp

slim (short, about 1U in size), works great, replaced a much larger and hotter power amp with no sacrifice in performance; fair price point; was able to take advantage of the options for triggering (12V, sound sense, or none); seems to interface fine with my Niles speaker selectors as expected

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Niles SI-2100

Great job Manny! Does exactly what I wanted to happen!! Thank you!

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Niles SI-2100

Very happy with the new amplifier and your service is awesome.

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Niles SI-2100

Good, clean power. Sleek, minimalist design. And open-box pricing. Perfect.

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MORE POWER!!!

Got this Amp to power a set of out door speakers using my Yamaha Theater receiver as a source. So now my Zone 2 is patched outside. Matched with the Niles volume control I get loud, clear sound outside.

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Powahhh!

Bought this amp to drive an older 10" JL W6 in a home theater application. Rated power when bridged mono was a perfect match (400W RMS @ 8Ohm). DIY sealed box, hooked up to the subwoofer (SW) preout of a Marantz AV receiver. This setup far exceeded my expectations. The amp effortlessly drives this sub - music is clean and punchy, LFEs in movies are explosive and visceral. I've listened to Pink Floyd's Time and Outkast's Rosa Parks a few dozen times each and haven't stopped smiling. Great purchase, super useful low profile amp with gobs of power. Runs warm, have fans or leave doors open.

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Niles SI-2100

Feels heavy and well built. Great value. The only negative is long 10 second delay with the auto detection to turn the amp on. This means it's not convenient to use with an Alexa device.

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Niles SI-2100

Easy installation and great sound from Zone 2- hooked it up to my Onkyo receiver.

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Clean and powerful amplifier with compact form factor.

Just the right form factor for my Jamo Concert 9 Series C 93 II bookshelf speakers. Simple and versatile design in a compact formfactor with all the right features. Future proof because they can be bridged then stacked and come with rack mounting brackets!

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If sounds matter to you, nod the Nad

Bought two of these to replace my aging mono amps. These are class D amps. I kept an a open mind and decided to try them in a stereo music setup. The niles got impressive reviews (which made me choose them). To me the sound is on the bright side. They handled the loads well and played loud. But the warmth of a class A or class Ab was lacking. I exchanged these for the Nad cL 940 (only rated at 35w/ channel) which played music with warmth and superb clarity. The bass was accurate too. I thought to myself "this amp makes the sweetest sounds. Do not pay attention to the 35w power output specs. This little guy(I suspect) punches way above that. I use it to power front speakers that are limited to 80 hz. My sub handles the rest. If u need more power this can be bridged to output more than 70w/ channel. This is a 4 channel amp in regular stereo mode, and two channel in bridged mode. It sounds so good in 35w mode that I don't want to mess with it. if you want great subwoofer amps, then buy the Niles 2100's. If you want music that satisfies the soul, get the Nad. Please don't make the same mistake I did. Go ahead and spend a little bit more so you don't end up feeling like tossing your amp(s) out the window.

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Niles SI-2100

Bought this amp to rebuild my system. Back in the 80's I had a SAE amp and a SAE preamp that where fantastic unfortunately about 10 years ago the amp started smoking and in the process took out the preamp also. I'm going to start with just one amp and if the sound is what I want I'll get another one and run them bridged to get back the power I had with the SAE. The Yamaha receiver I've been running is okay but now that I can afford it I'm looking to get high end equipment again.

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Niles SI-2100

I am using this amp for my ceiling speakers. There was a huge difference in sound once connected.

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Audio distribution amplifier

This is very stable audio distribution amplifier that works with loads below 3 Ohm. It has also excellent overload circuit protection. Niles continues it's legacy with this product.

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Niles SI-2100

You can always depend on Niles quality products. Designed and built very well.

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Niles SI-2100

Great sound and works well. Connected to receiver via 3.5 aux and turns on/off with receiver.

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Niles SI-2100

Sounds quite good with the Klipsch speakers. Annoying that the sensor turns these off frequently, but I understand this feature is defeatable.

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Niles SI-2100

This Niles amp is perfect for my in-wall 8" Paradigm speakers. I use my Sonos Port to integrate my house and outside 70V systems.

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Review Analogy

I had a friend who jumped off the roof from a five-story building. On his way down, people poked their heads out the windows and asked my friend how he was doing. He answered: Sooo faaaar, soooo, goooood ...

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Niles SI-2100

Powering Martin Logan motion 40's. Front R. l. Channels on 7.2.4 system with Marantz 6012. Drives them well.

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Niles SI-2100

Sounds fantastic and great value!

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Niles SI-2100

So far great product..

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Niles SI-2100

so far looks good

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Niles SI-2100

This power amplifier powers my home system that contains speakers in 4 different rooms of my house. The automatic power on/off works like a charm. The sound is much better than the old receiver I was using before . Very nice amplifier!

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200 Watts of Quality Power easily drives 6 Niles OS 5.5 speakers

This Power Amp was recommended by the AV Design Experts and I am very pleased with it performance. I was concerned it wouldn't have enough power to drive 6 Niles OS 5.5 speakers in a outdoor pavilion through a volume controlled speaker selector. It has absolutely no issue driving all 6 speakers at the same time and they sound great. You get what you pay for, so although this amp is a little pricey I believe you will be very happy with the performance. Due to being in an outdoor space I want to go minimal with speakers, amp, and Bluetooth receiver. This amp matched with the Niles outdoor speakers, and iFi Audio Zen Blue is a great combo.

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Niles SI-2100

Works week. Nice boost to sound.

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Niles SI-2100

Great little amp for the price.

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Great for adding a 2nd zone or surround speakers

I picked up the Niles SI-2100 to add height speakers to my basement system. I'm impressed with the quality, and its compact profile. I'm going to purchase another to add a 2nd set of height speakers to my main system.

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Niles SI-2100

I use this to power my subs on my Klipsch Forte lll's and it is an excellent unit, plus it looks great!

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Great Sound and Budget Friendly

I was looking for an amp to pair with my Carver Pre-Amp that was budget friendly and would fit in my stereo cabinet. This amp was perfect. Nice, compact size and paired well with my Carver. Using the amp to power my Polk Tsi-300 and it does a great job. My previous amp was an older Technics amp and I was worried that a newer amp would not sound as good but was very pleasantly surprised. I also like that the amp runs cool even at high volumes for long listening sessions. Lots of power for a great price.

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Amp

This is a nice amp for sure, I'm very impressed with this purchase.

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Great little amp

I purchased this amplifier to drive a pair of Bowers & Wilkins AM-1 outdoor speakers. It is being driven from zone 2 of my Lexicon MC-8 Digital Controller and it sounds really good.

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Niles SI-2100

I only bought this so I could Add my Equalizer to the Marantz NR1200 It does not give me the same ability and tone adjustment that i used to get using a tape monitor loop of my older Harmon Kardin

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Niles SI-2100

This amp is exactly what I was missing to run my power hungry Elac speakers. It really brought them to life! Love that it can handle low ohm loads and multiple speakers from each terminal.

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Niles SI-2100

great product

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Almost perfect

This amp does exactly what I want it to. 12 volt trigger works great as I'm using this to power 3 "zone 2" speaker pairs. Sound is very good when playing music, but if the source is paused, there is a faint hum that I have not been able to eliminate.

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Niles SI-2100

These 2 amps worked PERFECT for my zone 2/3 application driving 2 pair of speakers per zone with plenty of power and delivering a true audiophile experience. I couldn't be happier.

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Just like peanuts, one is not enough.

Just ask awesome little amp, stays cool and sounds crystal clear. Started with one and now have 3 to run my zones. Love it.

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Front height speakers

It is a great product and got it at a super sale price at Crutchfield. I purchased it to power my front height speakers paired with a Sony STR-ZA2100ES and it is a good match and integrated perfectly. I do think that my STR-ZA2100ES treble is more airy and refined than on this unit although it is still breaking in and being rated at the same wattage per channel I also believe the Sony is more dynamic and a bit more power but it could be because it is powering the fronts center, surround and surround speakers. Still a great until at a great price, would not change it for another amplifier.

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Niles SI-2100

Simple and easy to use

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Niles SI-2100

Added this to my 7.1 system to power my in-wall subwoofer. Running it bridged the amplifier provides perfect noiseless solid power to drive the speaker.

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Home Theatre Power Amp

This Power Amp is terrific! Extremely high quality upon terminating into 4 ohm stereo loads on two pair of Klipsch speakers per channel. And since the output is 220 watts per channel, I have headroom to spare. Great investment for a home theatre audio system.

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Niles SI-2100

I love this amp. I'm amped just talking about it! LOL! I like the auto shut off and the ease of use. Waiting for the si 2150 so I can upgrade.

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Brought my AM-1s to life

Love this amp. I had 4 Bower & Wilkins AM-1 hooked up to a Denon 800H A +B but was not getting the performance with all 4 running. I added this to Zone 2 on the Pool Speakers came to life. This is coming from a guy that has a pair of Rev 10s on his boat. Wow load crisp with great base.

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Niles SI-2100

Used mono bridge for passive sub, worked perfect.

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Niles SI-2100

Good Quality product.

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Niles SI-2100

This device is simple and powerful. I used it with an old set of Magneplanar MMGs and they have never sounded better.

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Great price for a great product

Great amplifier. Does exactly what I need it to do. Great value for this product too.

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Great product at a great price!

Great product - quality through and through. Wonderful sound.

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Niles SI-2100

Great item easy connection and powerful I add two wide speakers to my Onkyo now i have 11.2 sound and is amazing

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21st century design in second room amp

This is all you need and nothing more in an auxiliary amp, wrapped in a beautiful package. I'm proud to have this as a part of my system!

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Niles SI-2100 as Dolby Atmos Front Height power amp

I purchased the SI-2100 to power my front height speakers in my 7.1.2 Dolby Atmos setup, driving the SI-2100 from my Anthem MRX-720 receiver. The SI-2100 was easy to add to the system, I used the trigger output of the MRX-720 to trigger the SI-2100 to power on with the rest of the system. The amp is very quiet, no hiss or noise with my ear right against the height speakers.

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Niles SI-2100

Great power and sound for the money

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Solid little amp

I bought two of these to run 4 outdoor NHT O2 ARC (8ohm) speakers that are installed on dedicated fence posts around my pool. Both amps are daisy chained and hanging off of a Marantz NR1506 inside my house. Unfortunately, this makes my speaker wire runs a little long (all >60ft) so I ended up buying two of these amps and running a single speaker (8ohm) off of each channel using 12awg wire. I'm using banana plugs at all connections. NOTE: If I had the ability to do shorter speaker wire runs I would have no problem running a single SI-2100 to power four 8ohm speakers I use these amps almost daily. I've even used them for ~12 hours straight w/o issue. This includes cranking things up and down throughout the day/night. Considering how low profile they are, they don't get very hot. However, if you plan to stack these with other equipment, I suggest placing this amp on top, or making sure to add some space between each device. The only area for heat dissipation is on top of the amp. So far, I'm impressed. They deliver a decent amount of power for the money in a no frills package. If you already have a frontend device (receiver/wifi streaming device), these amps will make a nice addition to your setup.

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Literal Tears of Joy!!!

This unit has brought my speakers to life. Back story, my father had a pair of E V Georgians circa 1964 that I was using a Denon integrated amplifier receiver to push them and the sound was not what I remembered as a boy. I hooked up the Niles Power Amp and all I can say is the speakers came alive. I am totally satisfied with this purchase. Thank you Crutchfield.

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Niles SI-2100

Works great paired with my onkyo receiver to power bedroom speakers, sounds fantastic!!

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Niles SI-2100

Excellent

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Niles SI-2100

Awesome design, awesome power! A fantastic deal!

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Niles SI-2100 is great

This is an outstanding product. The auto-on (auto-listening) feature is super helpful. The Niles does a great job driving all 8 of my in-ceiling speakers. I use it in combination with my Sonos Connect. Great tandem.

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Perfect!

Just what I needed. I used this to run my Atmos channel. Working great!

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Great amp

Perfect, exactly what I needed.

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Niles SI-2100

Easy to set up. Banana plugs spaced well. Runs 6 seat shakers in home theater. Works great!

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Excellent, affordable stereo power amp

Exactly what I needed. Was looking for a simple, affordable, stereo amp to pair with a Denon X3600H to utilize the A/V receiver's ability to process 11.1 (7.1.4 Atmos) channels via the multi-channel output. Anyone with one of these mid-level 9.1 Denon receivers that can process 11.1 should seriously consider this power amp for 7.1.4 Atmos. The ability to use 4 height speakers without compromising the rear surround channels is a game changer considering the cost of a 9.1 pre-amp + this amp vs the cost of an 11.1 pre-amp.

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AN ADD ON POWER AMP

THIS AMP IS VERY NICE. EASY SETUP, COMPACT AND SPACING, AND FITS IN WELL WITH MY PRESENT SYSTEM. EVEN THOUGH ITS A 2 CHANNEL AMP, IT CAN HANDLE UP TO 6 SPEAKERS. GOOD PIECE OF EQUIPMENT FOR THE MONEY.

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Solid

I purchased the Niles amp in replacement of another brand that cracked and popped when sound was at low volume, that was enouph for me too make an upgrade too this amp. Now there is zero noise at low volume and its powerful, the Bass is more robust , midrange as well as highs sound better, Im very happy with this amp. Its very good quality IMOP..

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Niles SI-2100

Nice clean power, easy to hook up, really woke up my speakers.

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A Solid Replacement

So far so good. Had to replace my Carver amp from "1980", yes 40 years of service, not bad. All that is now left of my original audio system is a pair of ADS L710 speakers. My requirements aren't what they used to be, and there is where the Niles more than fills the bill of what I want and need. It appears to be an excellent piece of equipment and you can't go wrong with Crutchfield, as trusted name for many years. At the moment very satisfied.

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Niles SI-2100

This amplifier is quite remarkable...especially for the money! Used to replace an AudioResearch D-100 amplifier purchased many more years ago then I care to remeber for far more than the Niles SI-2100 cost me, I was not disappointed. The pre-amp is also an AR tube, powering the full range of a pair of top of the line Mirage Tower speakers. I can't say that I am missing anything, and it doesn't take five minutes to warm up. Yes, technology has come a long way in electronics but this is not necesarily so in audio, older is sometimes better. The Niles-SI-2100 stands proudly with the big names of years ago. It doesn't hurt that it weighs practically nothing and fits in a smaller space generating a considerably less heat. Thinking of buying another rather than splitting channels!

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Very Nice Amplifier for Atmos Speakers

Using this to drive a pair of SVS Prime Elevation speakers. Works better than expected, good amount of clean power with absolutely no distortion detected at high volumes. Perfect amp for Atmos speakers!

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Excellent amp to bi-amp my Polk CSi A6

This is a very nicely built amp. I am using this for center channel Polk CSi A6. Using a Y cable to feed input to both L/R channels in the amp, and am bi-amping my CSi A6, the results are phenomenal. Dialogues are so crisp and clear. I am using a Yamaha RX A1060 receiver. Crutchcfield sales advisor Jenny was so helpful in advising me chose this amp. Niles support is also very reachable. Well built amp, excellent sound output. Well worth the investment.

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Great purchase

Been using this with a set of Klipsch Bookshelf speakers. Pushes them great and clear! I brought this on sale. An awesome purchase. Crutchfield service made the purchase even more worthwhile.

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Niles SI-2100

Works great and sounds great thx.

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