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Yamaha A-S1100

Stereo integrated amplifier (Black)

Item # 022AS1100B

One thing all audiophiles have in common is their tireless pursuit of pristine stereo sound.

One thing all audiophiles have in common is their tireless pursuit of pristine stereo sound.

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Item # 022AS1100B

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About the Yamaha A-S1100

Stereo sound for the serious listener

One thing all audiophiles have in common is their tireless pursuit of pristine stereo sound. That's why we love a good classic-style integrated amp like the Yamaha A-S1100. Its meticulous internal design is driven by one important objective: to serve your speakers a steady diet of clean power so they can perform to their fullest potential, while preserving every detail of your music. Combining Yamaha's latest audio technology with vintage-style features, the A-S1100 is a modern take on a classic amp, without any extraneous features coming between you and your music.
Yamaha A-S1100

The Yamaha A-S1100 is a musical powerhouse and a cool, retro-looking centerpiece for your stereo system.

Stereo sound for the serious listener

One thing all audiophiles have in common is their tireless pursuit of pristine stereo sound. That's why we love a good classic-style integrated amp like the Yamaha A-S1100. Its meticulous internal design is driven by one important objective: to serve your speakers a steady diet of clean power so they can perform to their fullest potential, while preserving every detail of your music. Combining Yamaha's latest audio technology with vintage-style features, the A-S1100 is a modern take on a classic amp, without any extraneous features coming between you and your music.

Quality construction, inside and out

Yamaha's A-S line of integrated amps is a favorite among some of our savviest audiophile customers, and the A-S1100 looks to be another winner. If you're among those discerning enough to pick one up, we can't wait to hear what you think of it. Probably the first thing you'll notice when you unbox your new A-S1100 is its substantial weight. That's a great indicator of its high-quality internal components. Externally, this retro-styled amp has plenty of "wow" factor, too. Its aluminum front panel and piano black wooden side panels make it an eye-catching centerpiece for your stereo system. Refined utilitarian accents like machined aluminum knobs and softly illuminated level meters provide the finishing touches to the A-S1100's stylish look.

Clean, pure sound

The A-S1100 has inputs for six analog audio components, including a turntable. This amp owes its impressive stereo performance in large part to Yamaha's Floating and Balanced Power Amplifier design. It employs a symmetrical layout with isolated circuitry, ensuring a high signal-to-noise ratio and a large, well-defined soundstage. This design separates the power amp circuit from the ground, so sound quality isn't adversely affected by tiny voltage fluctuations. The fully balanced signal path ensures an ultra-low-noise signal. Pure brass speaker terminals — contoured to the shape of human fingers so they're easy to turn and fasten tightly - reflect Yamaha's obsession with quality. They've taken pains to ensure that this final, critical link in the audio chain provides a secure connection for your speakers without impacting sound quality.


Product highlights:

  • 90 watts x 2 channels into 8 ohms (20-20,000 Hz) at 0.07% THD
  • 150 watts x 2 channels into 4 ohms (20-20,000 Hz) at 0.07% THD
  • 4-ohm capability allows use with a wide range of speakers
  • signal-to-noise ratio: 100 dB (CD), 90 dB (phono MM), 83 dB (phono MC)
  • large illuminated level meters (VU or peak) for left and right channels
  • large-capacity power supply delivers energetic, dynamic sound with a fast response
  • symmetrical amp layout separates left and right channel circuits for improved signal-to-noise ratio
  • aluminum front panel and wood side panels
  • discrete phono preamplifier
  • rotary bass and treble controls
  • front-panel switching for 2 pairs of speakers
  • all-stage fully discrete configuration for strong reproduction of high frequencies
  • electronic volume control for optimum sound dynamics
  • low-impedance design ensures powerful bass response
  • parallel volume and tone controls
  • remote control
Connections and Dimensions
  • 6 pairs of RCA audio inputs, including MM (moving magnet)/MC (moving coil) phono input
  • 1 stereo RCA record output
  • Main Direct Input lets you connect the A-S1100 to a surround sound receiver or pre/pro to power your home theater's front left and right speakers
  • 2 pairs of heavy-duty brass screw-type speaker terminals
  • full-size headphone jack
  • 12-volt trigger and remote in/out for use with external controllers
  • detachable power cord
  • 17-1/8"W x 6-1/8"H x 19-3/16"D
  • weight: 51.4 lbs.
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # A-S1100BL

What's in the box:

  • Integrated stereo amplifier
  • 6.5' AC power cord
  • Remote control (RAS32)
  • 2 "AA" batteries
  • Owner's Manual (En/Fr)
  • Safety Brochure (En/Fr)
  • US Warranty card
  • "Yamaha Worldwide Representative Offices" Note

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Yamaha A-S1100 reviews

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Awesome unit

Wes from Wexford, PA on 2/20/2019

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Don't hesitate and buy. I had been searching for a while and I am not sure you can get a better unit in this price range. I upgraded from my vintage Sansui AU-717 and this A-S1100 is fantastic. When I took it out of the box I was amazed at the design of the front of the unit, but when I turned it around I was even more amazed at the build quality. Very solid unit that is powering Monitor Audio Silver 300 speakers. Super crisp sound - tight highs and lows, but I am more impressed with the mid-range this combination produces. (Sources- bluesound Node 2i (Tidal HiFi), Marantz 5004 CD, Technics 1200)

Pros: Build Quality Looks SOUND (Crisp, direct, sharp) Meters


Crutchfield response on

7 of 7 found this helpful

Yamaha A-S1100

Crutchfield customer from Rio Rancho, NM on 2/9/2019

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Very nice unit. Excellent sound. It replaced a 40 year old Yamaha CA2010. I had to stick with Yamaha quality.



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1 of 1 found this helpful

Amazing amp

John from Las Vegas, NV on 1/21/2019

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Very good amplifier; a very big step up from the s501, etc. Much fuller and more room filling sound. Fine details in the music are easily heard. Money well spent.

Pros: Sound improvement.

Cons: Weight

Crutchfield response on

3 of 4 found this helpful

A superb integrated amp!

John from Brookline, MA on 12/15/2018

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One of the best integrated amps I've ever heard, and I've heard and owned many. Clean, transparent, distortion-free and highly detailed sound is what this unit delivers across the whole audible frequency range. Lots of headroom - 90 watts into 8 ohms may not seem like much these days, but those are 90 CLEAN watts, especially when delivered to efficient speakers. ( I use Klipsch Heresy III's.) I haven't even needed to turn the volume past about 1/3 to fill my listening room with powerful sound. I listen to all types of music, but especially classical, which is the most challenging type of music for an audio system. The built-in phono preamp - often a weak spot in an amp - is excellent, with switchable MM/MC response. Not much more I can say - it's a great amp, built like a tank (57 pounds!) and well... you get what you pay for.

Pros: Clean, transparent, distortion-free and highly detailed sound across the whole audible frequency range. Lots of headroom, lots of power.

Cons: It damned expensive, I must say. But I'm glad I spent some extra bucks on this component.

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6 of 6 found this helpful

Live, Rich, Energetic, and Detailed

Craig from North Bend, OR on 1/23/2018

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This is an excellent integrated amp. I've only had it a week+ and have just gotten it broken in (100+ hours). Sonic signature is neutral with plenty of detail, but I quickly found that it needs to be connected to other good components to bring out its best-- and that includes interconnects as well as CD player w/DAC or transport and DAC. My system is a hodge-podge of "good stuff" and this amp fits right in and my stereo system now produces some of the finest music I have heard in my listening room. And as others have noted,it's "drop dead gorgeous" to look at. This will likely be my last amp and I plan to enjoy it to the end. I also really like the direct manual controls and "only the necessary inputs/outputs "on back as I'm not into anything but CDs for source material. Its sound is excellent on a broad variety of music from original rock if the recording is decent(1950's) to recent and ethereal New Age-y stuff-- also country, and it excels with my blues collection:-) I don't like complicated remotes either, but really would like a Balance control on this remote. This integrated is as good as my old Stereophile Class A and B components ever were. All above In My Humble Opinion!

Pros: Live, rich, energetic and detailed. Really useful manual controls as well as inputs and outputs. Beautiful appearance. 60 Day return Policy by Crutchfield was an important decision factor.

Cons: Very few, and none very serious. Heavy and big I'd like balance control on the remote too.

Crutchfield response on

13 of 14 found this helpful

Ended my Amp Quest

Guest from Kansas on 1/11/2018

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This integrated amp ended my search following auditions with Parasound, Rogue Audio, Sony, and others. Where this amp really shines is in its silent noise floor, channel separation, and bass extension. It made me realize that some other amps literally cut off the lowest bass octaves. In addition, it produces the most accurate piano tones I've heard from stereo playback. If I close my eyes, I can almost convince myself that a piano is in the room. Other amps make piano recordings sound as though there's a curtain between you and the instrument. There's no detectable transistor distortion either. Don't worry about its class AB topology. These are every bit as smooth as any class A amp.

Pros: Bass extension Clarity No detectable distortion Great channel separation Realistic piano tone

Cons: No LED on the volume knob It's Pre-In and Main-out design does not allow insertion of a high pass filter. In other words, it doesn't allow use of the high-pass filters that subwoofers often have for relieving the main speakers of low octave duties. Phono preamp is decent but not great

Crutchfield response on

14 of 14 found this helpful

Outstanding integrated amplifier!

Kirk from Jenkins Township,PA on 4/11/2017

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I am in love with this amplifier. I have a quadraphonic set-up and this is powering a pair of Klipsch Heresy speakers in the rear and a pair of KG 5.2 towers in the front. I upgraded to this amplifier as my old one was beginning to fail after being hammered by me at what my wife terms ridiculously LOUD levels. This amp drives all 4 speakers with plenty of power to spare. The most impressive part to me is how clean the sound is at every volume setting I've used. I generally never go over an estimated 80% of what the amplifier is capable of producing. I have zero audible distortion from the lowest level through the point that pictures are falling off of the walls throughout my house. This amplifier is the perfect unit for the few of us audiophiles remaining in a world of surround sound. There is no unnecessary, wasted space to drag the sound quality down. The icing on the cake is that watt for watt, the quality and price of the A-S1100 is unmatched. Installation is essentially exactly as one would remember setting a stereo up before surround sound units became the rage. I also love the appearance of this unit as it "LOOKS" like a real other words, the appearance is akin to the high end audio systems I remember from when I was a kid. I spent 14 months researching and listening to every amplifier & integrated amplifier I could locate within 150-200 miles of where I live and in the end I could have bought this unit at the very beginning of my sea

Pros: Clean sound, loads of usable power, appearance is excellent, Yamaha quality, best bang for the buck I found by far.

Cons: None for those who want a real clean, powerful stereo amplifier.

Crutchfield response on

23 of 24 found this helpful

Great Amp!!!

Michael from Chicago, IL on 1/30/2017

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Perfect amp for 2 channel music listening. Lots of clean power and it is also really cool looking with VU meters. I have large, audiophile-category floor standing speakers and records/vinyl sounds amazing. CD's as well. Great for movies. Note that if you have a modern TV with only the optical output or computer media, you'll need a DAC.

Pros: Lots of clean power High quality Phono and headphone inputs built in Great looking VU meters and classic styling

Cons: No digital inputs Big and heavy (if that's an issue for you)

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12 of 12 found this helpful

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More details on the Yamaha A-S1100

Stacey B.

Features & specs

Performance Specs
Watts RMS per Channel (8-ohms) 90
Watts RMS per Channel (6-ohms) Not given
Watts RMS per Channel (4-ohms) 150
Frequency Bandwidth 20-20k
THD 0.07%
Minimum Impedance 4 ohms
Signal to Noise Ratio 100
Digital Music Features
Built-in DAC (Digital to Analog Converter) No
High-resolution Audio Playback No
Bluetooth No
Wi-Fi N/A
Total Analog Inputs 6
Phono Input Yes
Optical Digital Inputs No
Coaxial Digital Inputs No
USB Input No
Preamp Outputs Stereo
Headphone Output 1/4"
Dimensions and Warranty
Width (inches) 17-1/8
Height (inches) 6-1/8
Depth (inches) 19-3/16
Weight (pounds) 51.4
Parts Warranty 2 Years
Labor Warranty 2 Years

Product Research

Audio Section
Inputs & Outputs
Front-Panel + Remote Control

Audio Section

Floating & Balanced Amplifier Design: The basic design of the A-S1100's power amplifier circuit adopts a unique floating and balanced power amplifier technology developed by Yamaha. Adopting output elements with the same polarity on the plus and minus sides of the output stage, along with completely separating the NFB (negative feedback) circuit and power supply into a total of four plus and minus sides of the left and right channels, results in a thoroughly symmetric push-pull operation of the output stage. Completely floating the entire power amplifier circuit from the ground removes any negative impact of minute voltage fluctuations or ground noise.

MOSFET Outputs: The amplifier's output elements are comprised of MOSFETs, which provide a warm and natural sonic characteristic in the audible playback. The use of MOSFETs, which have the same polarity on the plus and minus sides, further evolves the ideal symmetrical design to eliminate sound quality variations due to difference in polarity, a major distinguishing characteristic of the floating and balanced power amplifier. This results in sound with a superior signal-to-noise ratio and superbly well-defined sound fields

Dedicated Single-Ended Amplification: Since this device employs a dedicated single-ended amplifier, it provides excellent response in the amplification of single-ended analog sound from all kinds of audio sources such as CD players and D/A converters. By fully utilizing single-ended amplification, the A-S1100 transparently draws out the intrinsic qualities of your favorite audio devices, including those made by other manufacturers.

All-Stage Full Discrete Configuration: This amplifier adopts an all-stage, fully-discrete configuration through all sound circuit stages using only the most meticulously selected, high-precision parts from input to output (applicable during tone control circuit defeat). The slew-rate of the audio signal has been improved to bring lively and strong response to high musical notes. Moreover, the tone control circuit lets you switch to the defeat-state and enable a full-discrete configuration that bypasses the op-amp IC of the internal circuit, simply by setting the BASS / TREBLE knobs to their center points.

Low-Impedance Design: By strengthening the capacity of the high-current route (raising the section area of the cable core wire to about 60% of that of the A-S1000) and by pursuing thorough low-impedance design and forming screw-clamped wire connections of major ground points, the A-S1100 boasts excellent speaker drive power with a damping factor of more than 250 (8Ω, 1 kHz). Along with the large capacity power source transformer equipped with an EI core, this design delivers bass reproduction that is powerful.

Symmetrical Design: The left-right symmetrical construction with the power supply in the center and the ends of the power amp blocks achieves greater separation of the left and right channels. This is necessary for proper two-channel stereo reproduction and ideal weight balance. The center frame is fine-tuned which extends from the front to the back of the casing and with specially made metal legs (selectable from spike or pad), the A-S1100 has superb mechanical rigidity and installation stability that dramatically lessens the impact of external vibrations on sound quality.

Large Capacity Power Supply: The A-S1100 employs an original EI transformer, carefully customized for optimum compatibility with the chassis. Combining four large capacity carbon sheath block capacitors delivers an energetic sound, even during high volume that is only possible with the A-S1100. Moreover, since the control amp and control system is equipped with twelve shunt type local regulators that prevent deterioration caused by current fluctuation, a clean and stable power supply is achieved. The EI transformer is mounted on the chassis using a brass washer, restricting internal vibration that would result in noise.

Elegant & Sophisticated Design: The refined design and construction of the A-S1100 reflects the commitment to fine craftsmanship and art that Yamaha has exhibited for over a century as a world-class musical instrument maker. This amplifier offers a metal front panel and side wood panels that have been beautifully integrated by the masterful use of advanced technology. Moreover, the dials and tone controls are machined aluminum knobs for a richly textured finish and graceful touch.

Inputs & Outputs

6 RCA Inputs: The Yamaha A-S1100 is equipped with six unbalanced analog RCA stereo inputs for connecting an external audio source such as a CD player, AM/FM tuner, Turntable, and/or cassette deck; as well a preamp or AV receiver. There is also one analog RCA stereo output for recording through the amplifier.

Main Direct Input: One of the A-S1100's analog inputs is labeled Main Direct Input. This input allows you to connect your preamplifier or AV receiver directly to the A-S1100 and use the Yamaha integrated amp as a power amplifier to drive a pair of speakers in your system.

Note: Audio signal coming into the amplifier's Main Direct Input is only output through the speaker outputs of the A-S1100. No audio signal will by output from the stereo amplifier's Pre-Out, Rec Out, or Headphone Output.

Discrete Configured Phono Preamp: The phono preamp is comprised of a MC head amp and an equalizer amp, each of which are discretely configured, resulting in a rich sound with pronounced musicality when playing vinyl records with both MC and MM phono cartridges. The unit's Phono input consists of stereo RCA jacks and a ground terminal. There is a switch on the back panel which allows you to indicate what type of turntable cartridge (MC/MM) you are using.

High-Quality Binding Post Terminals: Yamaha's meticulous obsession with quality continues through to the speaker terminals, which are the last and crucial link in the audio chain. Featuring two sets of binding-post speaker terminals (A&B) with originally designed handles; these are created by cutting pure brass enabling secure connection with no reduction in sound quality. Contoured to the shape of human fingers, they not only look beautiful, but can be turned easily and fastened tightly with minimal effort. They are also compatible with connections using banana plugs.

Note: You can use the A & B speaker outputs to power two pair of separate speakers or you can bi-wire a single pair of speakers. If you use two sets (A and B) of speaker, the impedance of each speaker must be 8-ohm or higher. When only using one set of speakers (A or B), use speakers with an impedance of 4-ohm or higher.

Pre-Outs: The Yamaha integrated amplifier is equipped with a stereo preamp output for connecting a powered subwoofer or to use the A-S1100 as a preamplifier and connect it to a larger power amplifier to power your speakers.

Headphone Jack: The A-S11000 integrated amplifier is equipped with a front-panel 1/4" headphone jack for connecting a pair of headphones (sold separately). Once a set of headphones are connected, the amplifier's speaker outputs mute automatically.

Note: The headphones do not function for the amplifier Main Direct Input.

Trigger Input + Remote Input/Output: The A-S1100 features a 12V trigger input (3.5mm) to synchronize power on /off with another component that features a 12V trigger output. The integrated amp also has remote input and remote output minijack terminals for use with external IR receivers and compatible Yamaha components.

Front-Panel + Remote Control

Front-Panel Controls: The integrated amplifier offers the following convenient front-panel controls - Volume, Input Select, Bass & Treble, Balance, and A+B Speaker Selection.

Remote Control: The supplied remote control features a design complementary to the aluminum front panel of the amplifier with a simple, easy-to-understand button layout and a gorgeous metallic texture. In addition to the basic volume adjustment and input switching controls of the A-S1100, it can also be used to operate Yamaha CD players (sold separately).

Electronic Volume Control: Yamaha utilized a high-quality digital volume control specially designed by New Japan Radio Co., Ltd., which consists only of ladder-type resistance, removing the impact of slew-rate decline or coloring of the sound. This delivers higher purity in the sound and excellent, fast response to large volume changes and steep transients. Moreover, the tone controls employ a triple-parallel method, minimizing the detrimental impact on sound quality seen with straight-line tone controls.

Triple-Parallel Tone Control: In addition, the bass, treble, and common circuits each utilize simple construction in which the NFB of the amp is not used and the CR elements are simply fixed in a straight line. This ensures exceptional sound reproduction even when tone control is applied. When tone defeat is applied, straight signal flow from one volume circuit to a discrete configuration buffer amp is achieved.

Level Meters: The center of the main unit features level meters that provide visual enjoyment of the music with rapid or delicate movement of the needles. The meter is illuminated softly from inside by LEDs, giving a warm, beautiful lamplight look. The meter indicators, along with VU display, can be switched to show peak power as well, according to your preferences. The meter's window has been precision-fit to the panel and lays completely flat with no gaps for an elegant and beautiful appearance.

Auto Power Standby: The integrated amplifier enter standby mode automatically if not operate for approximately 8 hours.

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Customer Q&A

Crutchfield asked: Why did you buy this?
I have researched many sites for advice for my 2 channel system. I have owned Marantz Reference, McIntosh, Audio Research, among other high-end names. I chose the A-S1100 for both sonic and vendor reliability reasons, meaning both the vendor and the mfg. Ultimately, I trust Crutchfield to back up a product I will put up against some stiff (strictly tube) construction--and I have no concern they will back me! [ Dan  Jun 26, 2019 ]

4 questions already asked

Aloha! I intend to buy the Yamaha A-S1100 to power my Martin Logan 60xt 4 ohm speakers which I know without a doubt the amp can handle but I have one curious question that I am trying to get a definitive answer on. And that is do I also need to impedance match my receiver to this amp and speakers? Or am I only concerned about impedance matching the amp and speakers without worrying about the receiver impedance? In other words, is the receiver impedance even in the equation when matching the amp and speaker impedances? Will I have to impedance match all 3 pieces of gear or just the amp and speakers? Same question just stated different ways. Additional background info: The receiver I have is the Yamaha Aventage RX-A3070 which can be set to 8 ohms and 6 ohms. When set to 6 ohms the manual states that I can hook up 4 ohm speakers to the "front" speaker outputs which is what I have done for quite a while now with these Martin Logans for 2 channel listening pleasure without an amp. I now have several 8 ohm Definitive Technology speakers that will cause me to set the RX-A3070 receiver to 8 ohms and will also be taking up those "front" speaker spots. I want to hook the A-S1100 amp up to the receiver's zone 2 pre-out so I can maintain a separate 2 channel listening capability with the Martin Logans but I assume the zone 2 pre-out will be at 8 ohms. Just not sure if it matters once an amp (4 ohm stable) enters the equation to power some 4 ohm speakers.
[ steven  Jul 23, 2019 ]
1 answer
Hi Steven, You should not need to be concerned about the impedance of your receiver matching the amp, since you are only using the preamp outputs to control the AS1100 it should not have any effect. HAPPY listening!
[ Craig  Jul 31, 2019 ]
Can you add a subwoofer to the A-S1100?
[ RONNIE S  Oct 15, 2017 ]
1 answer
Sure. The Yamaha integrated amplifier is equipped with a stereo preamp output for connecting a powered subwoofer or to use the A-S1100 as a preamplifier and connect it to a larger power amplifier to power your speakers. You will find this information, and more, by clicking the "Details" tab on the Yamaha's main webpage and scrolling down below the "Features & Specs" table. I hope that helps. My Bio:
[ Ryan  Oct 20, 2017 ]  Staff
where is this model made? Malaysia or China?
[ C  Mar 08, 2019 ]
2 answers
I have absolutely no idea where it's made. Get a look at the online manual or phjotos and see if you can find the "made in" tag. Yamaha builds its products all over the world, not just China & Malaysia? They even make stuff in Japan! And the US! WHAT DIFFERENCE DOES ITY MAKE?? Your Crutchfield salesperson could probably tell you right off the bat, why is this being addrssed to me (a customer) anyway? BTW, I absolutely LOVE my Yamaha A-S1100 (Black, not silver) and I recommend it to you!
[ John  Mar 12, 2019 ]
[ Laura  Mar 12, 2019 ]

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