Monolith by Monoprice M2100X 2x90 Watts Per Channel Stereo Home Theater Power Amplifier with RCA & XLR Inputs
Product # 43863
UPC # 889028182611
$399.99
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Browse 44 questions
and 65 answers
No volume control?
New User U
on Nov 21, 2024
BEST ANSWER: Thank you for your question, Domenico. In order to control the volume, you would need a pre-amp or an AVR for the setup. I hope this helps.
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- Jhomar R Staff on Nov 22, 2024
BEST ANSWER: Thank you for your question, Domenico. In order to control the volume, you would need a pre-amp or an AVR for the setup. I hope this helps.
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- Jhomar R Staff on Nov 22, 2024
That is correct. This is strictly a power amplifier with source (pre-amp, streamer, etc) inputs. The source would control the volume. For example, a Wiim Pro Plus streamer connected to this amplifier. You would use the Wiim streamer to control volume via the Wiim smartphone app.
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- Lowell S on Nov 22, 2024
- Purchased on Mar 28, 2024
The volume control will be on the pre amp you connect to this. This is a stand alone amp, not a receiver.
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- Buysumtime on Nov 21, 2024
- Purchased on Feb 8, 2024
This is an amplifier. The volume is controlled by the source device, such as a receiver, preamp, etc.
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- M3incorp on Nov 21, 2024
- Purchased on Jan 15, 2024
It is a power amp not a preamp. Pre amps and integrated amps have volume controls.
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- Brian K on Nov 21, 2024
- Purchased on Feb 12, 2024
No volume control. You will need a preamp or receiver with preamp outputs.
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- STEVEN F on Nov 21, 2024
- Purchased on Mar 5, 2024
you need a pre amp..or home theater amp with rca audio outputs
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- bill b on Nov 22, 2024
- Purchased on Jan 17, 2024
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Where are the back panel photos?
A shopper
on May 14, 2024
BEST ANSWER: Hi, below the main picture, you'll see small ones and a right arrow. You can press the right arrow until you see the picture of the rear panel. Thank you.
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- Jhomar R Staff on May 14, 2024
BEST ANSWER: Hi, below the main picture, you'll see small ones and a right arrow. You can press the right arrow until you see the picture of the rear panel. Thank you.
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- Jhomar R Staff on May 14, 2024
Hi, on the monoprice site, there are little pictures below main picture you can enlarge. Use the right arrow and select the sixth picture. It will provide backside photo.
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- Brian K on May 14, 2024
- Purchased on Feb 12, 2024
its same as all there other brands 2 balanced 2 rca a plug 2 areas speaker wires go
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- Justin on May 15, 2024
- Purchased on Dec 15, 2023
hit arrows left or right on pictres below/slides shows back panel
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- Justin on May 15, 2024
- Purchased on Dec 15, 2023
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The XLR inputs are those balanced inputs on this amplifier?
A shopper
on Mar 17, 2025
BEST ANSWER: Hi, based on the specs on the website, the XLR input is unbalanced.
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- Jhomar R Staff on Mar 19, 2025
BEST ANSWER: Hi, based on the specs on the website, the XLR input is unbalanced.
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- Jhomar R Staff on Mar 19, 2025
According to the documentation, they are not. Those XLR inputs are just for convenience. It wasn't a show stopper for me and the amp sounds great no matter which input you use.
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- Alan S on Mar 18, 2025
- Purchased on Jan 13, 2025
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In addition to my (Answered) question about the XLR inputs, I got an answer saying it's for convenience, I Think this is besides the point of my question. I asked what is the point of having XLR Unbalanced inputs in terms of the Balanced or Unbalanced ability / spec, many other known Amplifiers with XLR inputs are 'BALANCED' for a reason, to have a BALANCED connection and use XLR not just for convenience but to get the signal in Balanced 'form' --- Please elaborate why you chose to use an Unbalanced XLR connection on these lesser / more budget amplifiers, and not Balanced(I think a lot of these buyers of these new amps think they're getting balanced inputs)..?
K G
on Aug 27, 2023
Monolith by Monoprice M2100X 2x90 Watts Per Channel Stereo Home Theater Power Amplifier with RCA & XLR Inputs
Monolith by Monoprice M5100X 5x90 Watts Per Channel Multi-Channel Home Theater Power Amplifier with RCA & XLR Inputs
Monolith by Monoprice M3100X 3x90 Watts Per Channel Multi-Channel Home Theater Power Amplifier with RCA & XLR Inputs
BEST ANSWER: Convenience. Many amps are out there with XLR inputs that are not balanced inputs. Why would you expect balanced inputs on these "lesser / more budget amplifiers"?
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- Inaccurate
- New User U Staff on Aug 28, 2023
So the XLR is convenience of having an XLR connection without Balanced ability, I understand. - if you check the 'why I Bought this item' section, some are mistaken thinking it's a Balanced connection because it's XLR. This isn't my mistake I read the page / info about unbalanced XLR. I guess it is a mistake to think if an AMP has RCA + XLR, to think XLR is automatically going to be Balanced. why not just have RCA then I'd say. Thanks for responding.
No need to be snarky - especially when you are the seller. Bush league answer, imho. Not necessary.
BEST ANSWER: Convenience. Many amps are out there with XLR inputs that are not balanced inputs. Why would you expect balanced inputs on these "lesser / more budget amplifiers"?
- Reply(2)
- Inaccurate
- New User U Staff on Aug 28, 2023
So the XLR is convenience of having an XLR connection without Balanced ability, I understand. - if you check the 'why I Bought this item' section, some are mistaken thinking it's a Balanced connection because it's XLR. This isn't my mistake I read the page / info about unbalanced XLR. I guess it is a mistake to think if an AMP has RCA + XLR, to think XLR is automatically going to be Balanced. why not just have RCA then I'd say. Thanks for responding.
No need to be snarky - especially when you are the seller. Bush league answer, imho. Not necessary.
This is a strange feature and could be deceiving to the novice user. If you plug a balanced male XLR plug into this female XLR jack on the amplifier, it will certainly pass the signal, but there will be a 6 dB loss. The loss is because only half of the balanced signal is used. The other half goes to ground. I think the description should be modified so as to give a full explanation of what's going on. As I said, this is not how an XLR input is usually wired -- convenance or not.
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- Stephen D on Mar 15, 2024
You're asking non-product developers product development questions. Know your audience buddy...
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- Inaccurate
- New User U on Aug 31, 2023
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Does this have a metal faceplate?
A shopper
on Jan 29, 2024
BEST ANSWER: yes like a brushed aluminum
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- Justin on Jan 30, 2024
- Purchased on Dec 15, 2023
BEST ANSWER: yes like a brushed aluminum
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- Justin on Jan 30, 2024
- Purchased on Dec 15, 2023
The faceplate is the same material as the rest of the housing.
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- M3incorp on Jan 29, 2024
- Purchased on Jan 15, 2024
yes it does ..its very well made ..
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- bill b on Jan 30, 2024
- Purchased on Jan 17, 2024
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The power on indicator light is shown in red, as well as a violet or blue color. Can you explain the difference?
A shopper
on Jun 3, 2024
BEST ANSWER: Hi, the power indicator goes red when on standby mode and goes blue when its on. Thank you.
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- Jhomar R Staff on Jun 5, 2024
BEST ANSWER: Hi, the power indicator goes red when on standby mode and goes blue when its on. Thank you.
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- Jhomar R Staff on Jun 5, 2024
When the amplifier is in standby the indicator is red, when the system turned on the indicator glows blue.
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- Paul D on Jun 4, 2024
- Purchased on Feb 24, 2024
Light is red on standby mode, blue when turned on.
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- Amer H on Jun 3, 2024
- Purchased on Mar 23, 2024
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why call it a Multi Channel when it is only a dual or Stereo Unit?
A shopper
on Nov 25, 2023
Well, according to Meriam-Webster and other English language dictionaries....multi means more than one...multi doesn't indicate how many more than one, just more than one....so Monoprice is correct by saying this is a multi channel unit. Probably for marketing and branding they chose mutli- instead of stereo or dual.
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- S E on Nov 25, 2023
- Purchased on Sep 30, 2023
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Does it come with a remote?
A shopper
on Dec 29, 2023
BEST ANSWER: No. It only power your speakers.
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- New User U on Dec 29, 2023
- Purchased on Dec 15, 2023
BEST ANSWER: No. It only power your speakers.
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- New User U on Dec 29, 2023
- Purchased on Dec 15, 2023
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Can this amp be paired with the Yamaha RX-V870 AVR that is presently driving my Focal Theva's No.3?
Yamaha rated @ 80w x 3 - 25w x 2
Yamaha rated @ 80w x 3 - 25w x 2
A shopper
on Aug 16, 2024
BEST ANSWER: Monoprice Power Amp requires a pre-amp signal. It appears from my research that your Yamaha has a Pre-Out and a Line-Out. I am assuming you have a subwoofer using your Yamaha Pre-out. Therefore, without a pre-out available due to using a subwoofer, this power amp will not work for you. However, if you are not using the Yamaha pre-outs, then you have a signal pathway to the Monolith Power Amp. Your next problem is your Focal speakers are not bi-wireable. If they were bi-wireable, I would use the Monolith Power Amp to drive the lower frequencies. The Power Amp has some serious juice for the bass section.
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- Brian K on Aug 17, 2024
- Purchased on Feb 12, 2024
BEST ANSWER: Monoprice Power Amp requires a pre-amp signal. It appears from my research that your Yamaha has a Pre-Out and a Line-Out. I am assuming you have a subwoofer using your Yamaha Pre-out. Therefore, without a pre-out available due to using a subwoofer, this power amp will not work for you. However, if you are not using the Yamaha pre-outs, then you have a signal pathway to the Monolith Power Amp. Your next problem is your Focal speakers are not bi-wireable. If they were bi-wireable, I would use the Monolith Power Amp to drive the lower frequencies. The Power Amp has some serious juice for the bass section.
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- Brian K on Aug 17, 2024
- Purchased on Feb 12, 2024
i have mine driving 2 bowers shelf speakers like 140 watts so should be ok
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- Justin on Aug 17, 2024
- Purchased on Dec 15, 2023
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Would this be able to drive 4 JBL Studio Speakers which are 6 OHM?
Stephen M
on Aug 17, 2024
BEST ANSWER: It's a 2 channel amplifier. It cannot drive 4 speakers. You would need to purchase the 5ch amplifier for that.
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- New User U Staff on Aug 19, 2024
BEST ANSWER: It's a 2 channel amplifier. It cannot drive 4 speakers. You would need to purchase the 5ch amplifier for that.
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- New User U Staff on Aug 19, 2024
Yes, the specs show "Safe with all types of loads. Rated for 4 to 16 ohms" . Also shows 90 watts for 8 ohms, and 135 watts for 4 ohms - I suspect those 6 ohm JBLs will get a little more output than its stated 90 watts.
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- Paul D on Aug 19, 2024
- Purchased on Feb 24, 2024
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Does it sense input signal to turn on / off?
A shopper
on Oct 2, 2024
BEST ANSWER: Hi, you can use the trigger port for this feature. This brings an amplifier out of standby mode when music starts playing, reducing the time it takes for the amplifier to become active and start outputting audio to your speakers.
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- Jhomar R Staff on Oct 4, 2024
BEST ANSWER: Hi, you can use the trigger port for this feature. This brings an amplifier out of standby mode when music starts playing, reducing the time it takes for the amplifier to become active and start outputting audio to your speakers.
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- Jhomar R Staff on Oct 4, 2024
i love this amp..but no..it does not have this feature
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- bill b on Oct 2, 2024
- Purchased on Jan 17, 2024
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How many watts per channel RMS?
A shopper
on Dec 3, 2024
BEST ANSWER: Hi, thank you for your question. That's 90 watts per channel.
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- Jhomar R Staff on Dec 11, 2024
BEST ANSWER: Hi, thank you for your question. That's 90 watts per channel.
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- Jhomar R Staff on Dec 11, 2024
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How many watts RMS?
A shopper
on Aug 3, 2023
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What is the point of an XLR
input if it isn't balanced?
input if it isn't balanced?
A shopper
on Aug 8, 2023
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Is this amp capable of 2 ohm loads?
A shopper
on Oct 11, 2023
BEST ANSWER: No, only down to 4 ohms. I have a Parasound 275v2 two channel amp that will run at 2 ohms, but the amp can get hot.
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- Inaccurate
- David h on Oct 13, 2023
- Purchased on Aug 11, 2023
BEST ANSWER: No, only down to 4 ohms. I have a Parasound 275v2 two channel amp that will run at 2 ohms, but the amp can get hot.
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- David h on Oct 13, 2023
- Purchased on Aug 11, 2023
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Are the weights and dimensions shown in Full Specs for the shipping container, or the actual amp?
A shopper
on Nov 17, 2023
BEST ANSWER: Thank you for your inquiry. The weight listed on the full specs tab is the weight of the actual amplifier. The weight of the unit including the shipping box is 30.8 pounds.
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- Inaccurate
- Jake S Staff on Dec 1, 2023
BEST ANSWER: Thank you for your inquiry. The weight listed on the full specs tab is the weight of the actual amplifier. The weight of the unit including the shipping box is 30.8 pounds.
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- Jake S Staff on Dec 1, 2023
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Can this amplifier be driven in mono to drive one speaker and if so, what are the power ratings if one were to get two for a stereo system?
A shopper
on Dec 11, 2023
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what are the actual dimensions of the amp -- not the box?
A shopper
on Dec 19, 2023
BEST ANSWER: Thank you for your inquiry. The actual dimension should be 21.5" x 19.5" x 9.0" (545mm x 490mm x 230mm)
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- Inaccurate
- Jake S Staff on Dec 19, 2023
BEST ANSWER: Thank you for your inquiry. The actual dimension should be 21.5" x 19.5" x 9.0" (545mm x 490mm x 230mm)
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- Jake S Staff on Dec 19, 2023
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Is the XLR pass-through stereo? I'd like to create a 2.1 setup without a receiver or a pre/pro by connecting this subwoofer's XLR input to my LG CX 77 television's 3.5mm headphone output via an XLR-to-TRS cable into TRS-to-3.5mm adapter, then connect this subwoofer's XLR output to an M2100X to power a pair of THX-465T speakers. (I can upgrade that system later by adding a pre/pro, more amps, and more speakers.) Would this work?
A shopper
on May 13, 2024
Monolith by Monoprice M2100X 2x90 Watts Per Channel Stereo Home Theater Power Amplifier with RCA & XLR Inputs
Monoprice 6ft Premier Series XLR Male to 1/4in TRS Male Cable, 16AWG (Gold Plated)
Monoprice 3.5mm TRS Stereo Plug to 1/4in (6.35mm) TRS Stereo Jack Adapter, Gold Plated
Monolith by Monoprice THX-465T THX Certified Ultra Dolby Atmos Enabled Tower Speaker (Each)
Monolith by Monoprice M-15 V2 15in THX Certified Ultra 1000-Watt Powered Subwoofer
BEST ANSWER: No that doesnt work. The XLR only daisy chains the LFE from one sub to another.
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- New User U Staff on May 13, 2024
BEST ANSWER: No that doesnt work. The XLR only daisy chains the LFE from one sub to another.
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- New User U Staff on May 13, 2024
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what are the exact dimensions of just the Monolith by Monoprice M2100X 2x90 Watts Per Channel Stereo Home Theater Power Amplifier with RCA & XLR Inputs? the Full Specs page shows 17" x 15.5" x 5.9" but someone commented different dimensions. I need to know the exact dimensions of just the amp to ensure it will fit in my audio cabinet
A shopper
on Jul 22, 2024
BEST ANSWER: Hi, the actual dimensions of the product is 17" x 15.5" x 5.9" (431mm x 393mm x 150mm). Thank you
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- Jhomar R Staff on Jul 23, 2024
BEST ANSWER: Hi, the actual dimensions of the product is 17" x 15.5" x 5.9" (431mm x 393mm x 150mm). Thank you
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- Jhomar R Staff on Jul 23, 2024
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I have 4 speakers, how do I hook them up?
A shopper
on Aug 26, 2024
BEST ANSWER: You cant hook up 4 speakers to a 2ch amplifier.
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- New User U Staff on Aug 27, 2024
BEST ANSWER: You cant hook up 4 speakers to a 2ch amplifier.
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- New User U Staff on Aug 27, 2024
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Does the amp automatically go into a standby mode if no audio signal is detected or do you have to press the front button each time?
A shopper
on Nov 27, 2023
Would it work in the EU - 220V?
MOMCHIL Z
on Dec 7, 2023
Does this amp have the ability to auto-on and auto-off via the input source?
A shopper
on Dec 30, 2023
Can this amp be rack mounted?
Lance K
on Feb 13, 2024
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Rated 4 out of 5
Does the job.
I'm using the amp in a secondary system. It's being fed a signal from the Wiim Ultra streamer/preamp. We also have a Playstation and TV connected to the Wiim. We recently purchased a new credenza for the living room and it all looks and works very fine for the space. Submitted photos, but they all need to be rotated 90 degrees.
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Rated 5 out of 5
Monolith Amp
2 months in and it has performed well.
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Rated 5 out of 5
Great stereo amp
Great amp for my custom made bookshelf speakers. Big open sound, airy with plenty of range. The amp is solid comparable to the Hafler DH-500 it replaced.
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Rated 5 out of 5
First class build and performance
Possibly the best value for dollar piece of equipment i have purchased in the past 20 years.
I have 2 home theater installations, so I purchased 2 units when they were recently on sale. Both were to replace 2 not cheap but not good sounding class d amps, which were having class d amp issues driving my atmos overhead speakers.
The improvement in sound stage and clarity was instantly apparent.
I have 2 home theater installations, so I purchased 2 units when they were recently on sale. Both were to replace 2 not cheap but not good sounding class d amps, which were having class d amp issues driving my atmos overhead speakers.
The improvement in sound stage and clarity was instantly apparent.
Added Oct 28, 2024
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Rated 3 out of 5
Disappointed!
I have been eyeing this power amplifier for a little while now and after seeing all the good reviews, I decided to buy it. It's design is cool. Has a nice look to it and is simple and sleek. That's a plus. But, aside from the aesthetics, I am disappointed. It doesn't offer and auto sense on/.off through input signal. Only through 12v trigger. The sound is decent for 8 ohm speakers but for 4 ohm speakers, which it states it can produce 135 watts per channel into a 4 ohm load, it is terrible. There is no quality to the sound it produced whatsoever. It also struggled to push these speakers. Now, the speakers I used are 4 ohm, 100 watts each. This amp, according to it's specs, should have pushed them without any issues. This was a huge disappointment. For the average listener, with an 8 ohm set of speakers, this may work, but for anything else, this isn't the right amp.
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Rated 5 out of 5
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Rated 5 out of 5
Monoprice 2 channel amp
Wrorked great right out of the box; as advertised, great sound. Easy setup. Nice aesthetics. Great value.
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Rated 5 out of 5
M2100X
Love this Amp!! I am using it to power my surround speakers in a 7.2 setup. The sound is loud and clean. It definitely made my surround speakers come to life.
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Rated 3 out of 5
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Rated 5 out of 5
Monoprice M2100X
Sounds great and looks good.
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