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Russound A2100

Compact stereo power amplifier

Item # 543A2100

This compact workhorse delivers 100 watts per channel while taking up half the space of a traditional rack-mounted amp.

This compact workhorse delivers 100 watts per channel while taking up half the space of a traditional rack-mounted amp.

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Item # 543A2100

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$329.99 -$80.00 Price break

$249.99

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About the Russound A2100

Powerful amp, small footprint

I've been a fan of Russound's stereo amplifiers for years. They produce lots of power and are easy to use, and the A2100 is no exception. This compact workhorse delivers 100 watts per channel while only taking up half the space of a traditional rack-mounted amp. Install two side-by-side, or use the included full-width mounting ears for a clean single-amp install.

Powerful amp, small footprint

I've been a fan of Russound's stereo amplifiers for years. They produce lots of power and are easy to use, and the A2100 is no exception. This compact workhorse delivers 100 watts per channel while only taking up half the space of a traditional rack-mounted amp. Install two side-by-side, or use the included full-width mounting ears for a clean single-amp install.

Perfect for music in a second zone

With plenty of power under the hood, the A2100 can be used in a variety of configurations. Drive your main speakers with it, or connect a pair of outdoor or kitchen speakers for easy sound in a second zone.

Want to really jam? Bridge a pair of these amps to drive even the most power-hungry speakers with ease. A pair of RCA inputs support a pre-amp, receiver, or analog sources that have their own volume control.

Multiple power-on options

The A2100 can be turned on manually, or automatically when it detects a source. It's even 12-volt trigger compatible so you can have it turn on when another piece of equipment is fired up. A carefully designed chassis minimizes heat when installed in a rack.

Never worry about blowing your speakers

One of the features I like most about the A2100 is the ability to set maximum volume limits. On the back panel is a dial that lets you set a volume "ceiling." Even if an over-enthusiastic listener maxes out the system's volume, there won't be any damage to the speakers. This is a great way to make sure that guests or kids don't accidentally turn the system up to distortion levels.

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Product highlights:

  • 100 watts x 2 into 8 ohms
  • 125 watts x 2 into 4 ohms
  • 225 watts bridged into 8 ohms
  • robust protection circuitry
  • combines easily with other Russound 1/2-rack products
  • selectable output impedance: 8-ohm, 4-ohm, or bridged
  • 12v trigger input and output for automated turn-on
  • signal-sensing input activates the amplifier when a source is detected
  • 1 pair of analog stereo RCA inputs
  • one pair of speaker connectors (supports up to 12-gauge wire)
  • space-saving low-profile design
  • total harmonic distortion: less than 0.1% into 8 ohms
  • rack-mountable with included hardware
  • detachable power cable
  • 8-1/2"W x 10-1/2"D x 1-3/4"H
  • weight: 4.1 lbs.
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # 2800-536847

What's in the box:

  • Digital stereo amplifier
  • 6' AC power cord
  • 2 Short brackets
  • Long bracket
  • Mounting plate
  • 4 Countersunk-head machine screws
  • 6 Pan-head machine screws
  • 4 Rubber feet
  • Cord-lock clip
  • Installation Manual

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Russound A2100 reviews

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Does what it is suppose to do, with a clean sound

Crutchfield customer from Charlotte, NC on 5/1/2019

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Inexpensive and did exactly what I needed to move my Denon x4500 to a 7.2.4 Dolby Atmos system. I do not use the trigger function because it is also signal activated when sound is on. Only reason I'm giving it a 4 instead of a 5 is because I cannot connect Banana plugs. Pain to switch things around to try different settings. Over all, does what it suppose to do.

Pros: Sound

Cons: Speaker wire connections

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0 of 0 found this helpful

Music for Pool and Deck

Crutchfield customer from Fall Branch, TN on 4/14/2019

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Clean sound! Hooked Echo Inputs to 2 Russounds and Polk Atriums. Named the Echos Pool and Deck. Set the Russound to turn on with signal detection. Now I simple tell Alexa to play music (podcast or book) at Pool or Deck. Works flawless, very clean sound. Looking to do same for front porch and maybe other places. Very pleased. And of course, Crutchfield is ALWAYS the best!

Pros: Simple setup, easy options for remote on/off. Very clean sound. Rack mountable!

Cons: None. I love this setup!

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2 of 2 found this helpful

Mostly clean sound, but not perfect.

James from Gaithersburg, MD on 2/7/2018

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I bought the Russound A2100 based on a recommendation by a Crutchfield rep. I asked for an amp to power my mains on a 7.2.2 Klipsch Reference Premiere speaker setup currently powered by a Denon AVR-X4300H. I liked to play at reference levels & it seemed the Denon was struggling and getting hot when I approached 0db. I was told this amp was underrated at 100w & would be plenty of power for my setup. FYI, the AVR-X4300H is rated at 125w/ch 2ch driven. This amp is a mixed bag. Very cheap speaker connectors & cutting out of sound not good, Neither is the hiss when using the 12v trigger. But it does sound clean & powerful at most listening levels. If someone tells you it is underrated at 100w, don't believe it. I am sorry I got it because I now need another one or a better more powerful amp.

Pros: The Russound added a good bit of punch and dynamic headroom to the mains. I calibrated the setup using the Audyssey MultEQ XT32 in the Denon and the result was very good for most listening levels.

Cons: The speaker connections are simply idiotic, tiny, difficult to work with, and very easy to short speaker wires on them. If you're using larger than 16 gauge wire you'll likely not get the wire into the connectors. The screws used to clamp down on speaker wires are weak, and will likely break if used more than once. One of mine stripped on first use & I am concerned about it falling out. Sound cuts out at or near reference level (set @ 80% gain).

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3 of 4 found this helpful

Excellent purchase.

Mike from Culver City, CA on 11/3/2017

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Does exactly what it's supposed to do. Output is matched to our speakers. Sound quality is awesome. No problem with set up nor inputting speaker wires etc...

Pros: Love that you can unplug speakers from back of unit all at one time (If you need to move the unit).

Cons:

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0 of 0 found this helpful

Solid Sounding Amp

John from Phoenixville, PA on 9/24/2017

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For a very reasonable cost, this amp provides great sound from ceiling speakers using a second output from my preamp. The unit is very compact, which is both good and bad. The power is fully adequate to drive the speakers and the sound is clean and crisp. The only issue is that the speaker connects are in a word microscopic. They will only accommodate wire up to a certain gauge and the 4 leads are so close it was not at all easy to set each connection in place. Any fraying on the wire edge made it even more difficult. Now that it's set up I am enjoying the unit, but I must admit it almost was returned due to the speaker connects.

Pros: Price, power, sound quality, compact size

Cons: Very small connects for speaker wires

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1 of 1 found this helpful

Small device, Delivers great sound.

Ramon from Philadelphia, PA on 11/7/2016

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I can't believe this product as small as it is can deliver what My B&K Components monster of a box delivered for me in the past. Great product.

Pros:

Cons:

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More details on the Russound A2100

Stacey B.

Product Research

Features

A2100 Digital Amplifier: The Russound A2100 is a 2-channel digital amplifier designed to be used to boost audio amplification where needed, either as a standalone amplifier, or as an addition to a whole-house distributed audio system in order to provide extra amplifier power in larger rooms or spaces.

Class D Stereo Amplifier: The Russound A2100 utilizes the latest Class D digital amplification technology. Designed to handle an impedance as low as 4 ohms allows a total of four 8-ohm speakers to be used with the A2100 amplifier.

  • Stereo (8 Ohms): 100W x 2Ch @ 8 Ohms < 0.1% THD+N
  • Stereo (4 Ohms): 125W x 2Ch @ 4 Ohms < 0.5% THD +N
  • Bridged (8 Ohms): 225W x 1Ch @ 8 Ohms < 0.2% THD+N

Bridgeable: If 100 watts isn't enough for you, the A2100 includes a bridge option that allows you to bridge both channels into a single powerful 225-watt output. Combine two A2100 units together in the same system and you can have a stereo output at 225-watts per channel at 8 ohms.

Line Input w/ Level Control: The Russound A2100 digital stereo amplifier is equipped with one stereo RCA input with volume level control.

Buffered Line Output: The A2100 includes a stereo buffered line output that can be used for daisy-chaining additional amplifiers to your system. By using the integrated line outputs, you can add multiple amplifiers and create an expansive audio zone for very large rooms or outdoor zones that require additional power or more speakers.

Removable Screw-Down Speaker Connectors: Installer-friendly, removal screw-down connectors are used for all speaker connections, allowing you to lock in all connections for a long-lasting, trouble-free installation that is still easy to service and adjust throughout the life of the system. All connectors accept up to 12-gauge speaker wire.

Power Modes: The A2100 digital stereo amplifier has three modes of power operation - Always On, Auto On (Signal Sensing), & Trigger.

  • Always On: In this mode, the A2100 is always active and ready for use.
  • Auto On (Signal Sensing): Thanks to Auto On, the amplifier can detect the presence of an audio signal and automatically turns on. The unit stays in Standby mode when there is no audio signal present.
  • Trigger In/Out: The A2100 features a 12V trigger input (3.5mm) and can detect the presence of a 12vDC signal and turns on the amplifier when the signal is present and turns it off when the signal goes away. The Trigger Out (3.5mm) provides 100mA/12VDC max to drive other 12V triggered devices. When using Trigger mode, the front panel power  switch must be On.

Protection Circuitry: The Russound A2100 digital stereo amplifier utilizes built-in protection circuitry to prevent the amplifier from being damaged as a result of a short-circuit or thermal overload.

  • Short-Circuit Protection: The A2100 is designed with special circuitry to safeguard the amplifier under a short-circuit condition. A faulty speaker can also cause a short circuit condition. The front panel LED illuminates orange when the amplifier is in short circuit protection.  If this fault condition occurs, turn off the amplifier and check speakers for short circuit conditions when appropriate.
  • Thermal Overload Protection: The A2100 is designed with special circuitry to safeguard the amplifier under a thermal overload condition. Thermal protection mode can only engage when the unit has been run at high volume for extended periods of time without adequate ventilation and/or when speaker impedances are below the minimum levels for the amplifier. If this fault occurs, turn off the amplifier, and check that the speaker impedance rating is above the minimum rating. Also check for adequate ventilation around the amplifier and make adjustments if necessary. Once the unit has cooled to safe operating temperatures, the amplifier may be powered back on.

Mounting Options: The Russound A2100 amplifier can be set on a tabletop or wall-mounted with screws or hook-and-loop tape. Rack-mounting ears are included to install either one A2100 in a 1U space or two units in a 1U space.

  • Tabletop-Mount: Simply place the A2100 amplifier on a horizontal flat surface with adequate ventilation on the top and all sides. Four self-adhesive rubber feet are included (the feet add approximately 0.1875" to the overall height of the amplifier).
  • Wall-Mount: The amplifier comes with two wall mounting brackets and attachment screws. There are two attachment locations on each side of the amplifier for more mounting options. Hook-and-loop tape can be used as well.
  • Rack-Mount: The rack mounting ears support either one or two amps in a single rack space. To install one amplifier in a rack space, use the long ear and one of the wall-mount brackets. The unit can be mounted either to the left or right side of the rack space.

Detachable AC Power Cord: The Russound A2100 comes with a detachable 6' AC power terminated by a 3-prong connector. A flip-down cord lock keeps the IEC power cord in its place, preventing accidental disconnection when moving gear in a stack or when pivoting a rack for service.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Recommended by Advisor Artie, but I reviewed online to check. Okay... bought this amp. Seems best for my application. [ S  Jul 20, 2019 ]
A
Highpower in a small package. [ Philip  Sep 19, 2017 ]
A
Need an amplifier for my whole home speaker system [ Daniel R.  Mar 26, 2017 ]

2 questions already asked

Q
Why isn't the frequency response published?
[ Al  Jun 22, 2019 ]
1 answer
A
I don't think frequency response is published for an amplifier. I believe it is for speakers only. Amplifiers can publish THD which you may be confusing
[ Marcus  Jun 25, 2019 ]
Q
Can this amp be placed on its side and mounted so?
[ Marcus  Jun 01, 2019 ]
2 answers
A
Yes, of course.
[ Jeff  Jun 11, 2019 ]
A
I don't see why you couldn't mount on side if your rack can hold it that way.
[ JED E  Jun 11, 2019 ]

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