Monolith by Monoprice M8125x 8x100 Watts Per Channel Class-D Multi-Channel Home Theater Power Amplifier with XLR Inputs Hypex NC252MP
Product # 42565
UPC # 889028185520
$1,999.99
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Browse 22 questions
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and 16 answers
Are you currently shipping the units that have the xlr to rca fix? It was reported on AVS website but haven’t heard anything as of late.
New User U
on Apr 18, 2023
BEST ANSWER: It has not been implemented in these units, but we can send out a kit to you that can be installed. This is only applicable if you are going to use an XLR to RCA adapter. If connecting XLR to XLR, no need to have fix.
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- Inaccurate
- New User U Staff on Apr 26, 2023
BEST ANSWER: It has not been implemented in these units, but we can send out a kit to you that can be installed. This is only applicable if you are going to use an XLR to RCA adapter. If connecting XLR to XLR, no need to have fix.
- Reply
- Inaccurate
- New User U Staff on Apr 26, 2023
I have a support ticket response that forwarded my inquiry to a higher tier. It has been a week with no response. It looks like a generic Hypex design with the added heatsink. The Hypex design makes it easy to repair, but I would like the Monoprice 5-year replacement warranty. I'd like to know if the fix hasn't been implemented or will the shield plate be included for DIY modification. A simple fix to implement, but going unanswered leads to other concerns.
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- Inaccurate
- Lionel S on Apr 24, 2023
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Is this a new amp?
A shopper
on Dec 19, 2021
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How do the power ratings from this model differ from 200watt model of this? Also what are the power requirements from outlet circuit?
Daniel J
on Jan 6, 2022
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Any plans on a 5 channel? I think that would sell like hot cakes
Eric S
on Jul 20, 2022
Monolith by Monoprice M8125x 8x100 Watts Per Channel Class-D Multi-Channel Home Theater Power Amplifier with XLR Inputs Hypex NC252MP
Monolith by Monoprice M8250x 8x200 Watts Per Channel Class-D Multi-Channel Home Theater Power Amplifier with XLR Inputs Hypex NC502MP
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Is it ok to have only some channels plugged in while it is running? So if I am using 4 channels and have the other four unplugged (four of my 8 speakers are backordered).
New User U
on Oct 13, 2022
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WHAT DOES CLASS D MEAN ?
A shopper
on Oct 19, 2022
BEST ANSWER: https://en.wikipedia.org/wiki/Class-D_amplifier
- Reply
- Inaccurate
- New User U Staff on Oct 19, 2022
BEST ANSWER: https://en.wikipedia.org/wiki/Class-D_amplifier
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- Inaccurate
- New User U Staff on Oct 19, 2022
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I am interested in this amp, but 8 channels is confusing to me. 5, 7, 9, 11 makes sense, but maybe I'm missing something. What home theater configuration would use the 8th channel? Thanks!
Loren H
on Nov 25, 2022
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Can two outputs be connected to provide 200w (bi-amp)?
A shopper
on Apr 11, 2023
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do the currently shipping units have the XLR to RCA hum fix issue resolved?
david m
on Apr 11, 2023
BEST ANSWER: Thank you for your question. That should not be an issue. If you do have further questions about this, please reach out to our Customer Support team.
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- Inaccurate
- Carlos R Staff on Oct 11, 2023
BEST ANSWER: Thank you for your question. That should not be an issue. If you do have further questions about this, please reach out to our Customer Support team.
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- Inaccurate
- Carlos R Staff on Oct 11, 2023
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Do you need an XLR into each port to make the correlating speaker work? So if you have a source that's RCA, you'd have to buy several RCA splitters and RCA to XLR adapters for it to work? But then you get the hum. So what do you plan to do to fix this massive error in design?
A shopper
on Apr 25, 2023
BEST ANSWER: This unit only has balanced XLR. I own this and it is working out great, but my processer has all balanced XLR outputs for connection. I also own the 9x which has XLR and RCA inputs, again I am using XLR with 9x as well.
In my opinion this unit was designed to be smaller dimensionally (low height), so eliminating the RCA would be the correct engineering choice as most home audio nowadays uses XLR. If you required RCA I suggest looking at the 9x, 11x or the 7x (200W x 7).
This unit just doesn't fit your application needs, but that does not mean it has a "massive error in design". It was perfect to power my 6 - ATMOS speakers while comfortably fitting inside my current audio tower. A taller unit would have caused issues for me as the 9x already takes up a lot of space.
In my opinion this unit was designed to be smaller dimensionally (low height), so eliminating the RCA would be the correct engineering choice as most home audio nowadays uses XLR. If you required RCA I suggest looking at the 9x, 11x or the 7x (200W x 7).
This unit just doesn't fit your application needs, but that does not mean it has a "massive error in design". It was perfect to power my 6 - ATMOS speakers while comfortably fitting inside my current audio tower. A taller unit would have caused issues for me as the 9x already takes up a lot of space.
- Reply
- Inaccurate
- Timothy F on Apr 25, 2023
- Purchased on Apr 14, 2023
Monolith by Monoprice 7x200 Watts Per Channel Multi-Channel Home Theater Power Amplifier with XLR Inputs
Monolith by Monoprice 5x200 Watts Per Channel Multi-Channel Home Theater Power Amplifier with XLR Inputs
Monolith by Monoprice 9-Channel (3x200 Watts + 6x100 Watts) Multi-Channel Home Theater Power Amplifier with XLR Inputs
Monolith by Monoprice 11-Channel (3x200 + 8x100 Watts) Multi-Channel Home Theater Power Amplifier with XLR Inputs
BEST ANSWER: This unit only has balanced XLR. I own this and it is working out great, but my processer has all balanced XLR outputs for connection. I also own the 9x which has XLR and RCA inputs, again I am using XLR with 9x as well.
In my opinion this unit was designed to be smaller dimensionally (low height), so eliminating the RCA would be the correct engineering choice as most home audio nowadays uses XLR. If you required RCA I suggest looking at the 9x, 11x or the 7x (200W x 7).
This unit just doesn't fit your application needs, but that does not mean it has a "massive error in design". It was perfect to power my 6 - ATMOS speakers while comfortably fitting inside my current audio tower. A taller unit would have caused issues for me as the 9x already takes up a lot of space.
In my opinion this unit was designed to be smaller dimensionally (low height), so eliminating the RCA would be the correct engineering choice as most home audio nowadays uses XLR. If you required RCA I suggest looking at the 9x, 11x or the 7x (200W x 7).
This unit just doesn't fit your application needs, but that does not mean it has a "massive error in design". It was perfect to power my 6 - ATMOS speakers while comfortably fitting inside my current audio tower. A taller unit would have caused issues for me as the 9x already takes up a lot of space.
- Reply
- Inaccurate
- Timothy F on Apr 25, 2023
- Purchased on Apr 14, 2023
Monolith by Monoprice 7x200 Watts Per Channel Multi-Channel Home Theater Power Amplifier with XLR Inputs
Monolith by Monoprice 5x200 Watts Per Channel Multi-Channel Home Theater Power Amplifier with XLR Inputs
Monolith by Monoprice 9-Channel (3x200 Watts + 6x100 Watts) Multi-Channel Home Theater Power Amplifier with XLR Inputs
Monolith by Monoprice 11-Channel (3x200 + 8x100 Watts) Multi-Channel Home Theater Power Amplifier with XLR Inputs
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Can it be set to 4x channels BTL mode?
A shopper
on Aug 20, 2023
BEST ANSWER: No, bridging two channels together is not supported.
- Reply
- Inaccurate
- Baltobike on Aug 20, 2023
- Purchased on Apr 21, 2023
BEST ANSWER: No, bridging two channels together is not supported.
- Reply
- Inaccurate
- Baltobike on Aug 20, 2023
- Purchased on Apr 21, 2023
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Do you have a 7.1 Dolby Digital/DTS SPDIF decoder w/ +4dBu balanced XLR outputs to mate with this amplifier unit?
A shopper
on May 11, 2022
Would 2 of these be what were intended to power the 16channels for the HTP-1? No issues in ordering 2 now with the intent to pair with the HTP-1 when it comes back in stock?
New User U
on Aug 14, 2022
How did you rack mount this amp (M8125x)?
Daniel L
on Nov 23, 2022
I need 2 of these, but they must be able to fasten into a rack. A rack shelf is not acceptable. I know that the rack ears are not included in the box. Does Monoprice sell the rack ears? If not, what is a solution to get them? (Perhaps from your OEM?)
New User U
on Jan 29, 2023
The specs list this as 200 wpc @8 ohms. 200 wpc @ 4 ohms. But continue reading and then the specs change to 200 @8 and 175 @ 4. Can you confirm the true specs for wpc for 8 and 4 ohms? Thank you.
John B
on Mar 17, 2023
Does the current M8125 stock have the unbalanced input fix for the low level buzz in even numbered channels?
A shopper
on Apr 15, 2023
Is the Wattage rating higher with fewer channels driven? Can it get close to 200 Watts per channel with four channel driven (one per module)?
A shopper
on May 26, 2023
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Reviews
4.8 / 5.0
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Rated 5 out of 5
Powering full range Polk r700 towers
Awesome Amp! Powering a set of Polk R700s towers, a Polk L400 Center, and Polk rears. Great power, never gets hot, or warm really. even with running Polk tower speakers with dual 8" woofers at full range. Powering 7 speakers in a home theater config this thing has ample power on tap and so much more to spare.
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Response from Monoprice
It's great to hear that the Monolith by Monoprice M8125x amplifier is exceeding your expectations and providing ample power for your Polk R700 towers and home theater setup. If you need any further assistance or have questions about your amplifier or setup, feel free to let us know. Enjoy your home theater experience!
February 15, 2024
Eli S
Rated 5 out of 5
Plenty of Power for my Surround and Atmos speakers
Wanted class D Hypex or Purifi. The build quality of this amp is awesome and looks great too. I have no noise when sitting idle , using XLR connections to my HTP-1 processor. I use these 8 channels to power my LS, RS, LRS, RRS, and 4 atmos channels and never had an issue running at Reference levels on my M&K speakers running at 4 ohms. Recommended buy.
PS ,my LCRs are powered by a higher wattage Purify amplifier by another brand
PS ,my LCRs are powered by a higher wattage Purify amplifier by another brand
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November 2, 2023
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Response from Monoprice
Hey there, thanks for the 5-star review of our Monolith! I'm glad to hear that you're loving it so far.
It sounds like you're a serious audiophile, with your high-wattage Purifi amplifier powering your LCRs and the Monolith powering the rest of your speakers. You must have an incredible home theater system!
I'm sure you're very happy with the sound quality of your system, and I'm glad that the Monolith is playing its part. It's a great amplifier, and I'm confident that it will continue to provide you with many years of enjoyment.
If you're ever looking for other home theater equipment, be sure to check out our website. We have a wide selection of products to choose from, and our prices are very competitive.
It sounds like you're a serious audiophile, with your high-wattage Purifi amplifier powering your LCRs and the Monolith powering the rest of your speakers. You must have an incredible home theater system!
I'm sure you're very happy with the sound quality of your system, and I'm glad that the Monolith is playing its part. It's a great amplifier, and I'm confident that it will continue to provide you with many years of enjoyment.
If you're ever looking for other home theater equipment, be sure to check out our website. We have a wide selection of products to choose from, and our prices are very competitive.
November 2, 2023
Eli S
Rated 4 out of 5
Sound Quality & Appearance of the Monolith 8125X
Both the sound quality and the appearance of this amp more than met my expectations. Where are the rack mount adapters?
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Rated 5 out of 5
Quality and Value
The Monolith M8125 is built to a high standard and delivers great performance. The noise floor is vanishingly low in my system and it generates more power than most situations would require. It has no problems handling the custom subwoofers in my home theater (Dayton Audio UM18-22 18" drivers in sealed enclosures). The relatively shallow depth of the M8125 allows it to be used in smaller cabinets and it is cool in operation even when pushed fairly hard. The only limitations are the requirement for a 20 amp circuit for full power output and the lack of unbalanced (RCA) inputs. Highly recommended.
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