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frontpagevid1900 posted Today 07:49 PM
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  1. Deal Image
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Item 1 of 2
frontpagevid1900 posted Today 07:49 PM

Monoprice Monolith M2100X 2x90 W/Ch Home Theater Power Amplifier

+ Free S&H

$200

$400

50% off
Monoprice
7 Comments
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Deal Details
Monoprice has Monoprice Monolith M2100X 2x90 Watts Per Channel Stereo Home Theater Power Amplifier (43863) on sale for $399.99 - 50% off w/ promo code SHOP50 in cart = $199.99. Shipping is free.

Thanks to Community Member vid1900 for finding this deal.

Features:
  • 2 Channels of Amplification
  • 90 Watts Per Channel into 8 ohms
  • Unbalanced RCA Inputs
  • XLR Inputs
  • 3RU Height
  • Class AB Amplification
  • 3 Year Replacement Warranty

Editor's Notes

Written by SubZero5 | Staff
  • About this deal:
    • This price is $100 less than the previous FP deal.
  • About this product:
    • Rating of 4.7/5 from Monoprice customer reviews.
  • About this store:
    • Details of Monoprice's return policy (here)

Original Post

Written by vid1900
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Monoprice has Monoprice Monolith M2100X 2x90 Watts Per Channel Stereo Home Theater Power Amplifier (43863) on sale for $399.99 - 50% off w/ promo code SHOP50 in cart = $199.99. Shipping is free.

Thanks to Community Member vid1900 for finding this deal.

Features:
  • 2 Channels of Amplification
  • 90 Watts Per Channel into 8 ohms
  • Unbalanced RCA Inputs
  • XLR Inputs
  • 3RU Height
  • Class AB Amplification
  • 3 Year Replacement Warranty

Editor's Notes

Written by SubZero5 | Staff
  • About this deal:
    • This price is $100 less than the previous FP deal.
  • About this product:
    • Rating of 4.7/5 from Monoprice customer reviews.
  • About this store:
    • Details of Monoprice's return policy (here)

Original Post

Written by vid1900

Community Voting

Deal Score
+15
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Price Intelligence

Model: Monolith by Monoprice M2100X 2x90 Watts Per Channel Stereo Home Theater Power Amplifier with RCA & XLR Inputs

Deal History 

Sale Price
Slickdeal
  • $NaN
$200
  • Today

Current Prices

Sort: Lowest to Highest | Last Updated 7/3/2026, 01:36 AM
Sold By Sale Price
NewEgg$319.99

Top Comments

vid1900
3014 Posts
1636 Reputation
The Fosi v3 only puts out 34wpc into 8 ohms with the stock power supply...so you need to buy the 48v supply to get the 89 watts.

The Fosi lacks the XLR inputs

The Fosi lacks the 12v turn on circuit

The Fosi is a great little amp, but not in the same league as the Monolith.

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7 Comments

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Original Poster
Pro
Today 08:00 PM
3,014 Posts
Joined Sep 2016
vid1900
Original Poster
Pro
Today 08:00 PM
3,014 Posts
Just in case the original post gets edited:

The perfect amp to power your Streamer Box, add 2 more channels to your 7 channel amp, or to give some serious power to a dedicated Stereo system.

90wpc into 8 ohm speakers, 135wpc into 4 ohm speakers
1
Today 08:28 PM
168 Posts
Joined Sep 2018
MaroonLeopard1601Today 08:28 PM
168 Posts
What would be the difference between getting a fosi v3 / Douk a5 and this?
Today 08:54 PM
455 Posts
Joined Nov 2018
madsci1016Today 08:54 PM
455 Posts
Dang need the 3 channel
Original Poster
Pro
Today 09:52 PM
3,014 Posts
Joined Sep 2016
vid1900
Original Poster
Pro
Today 09:52 PM
3,014 Posts

Our community has rated this post as helpful. If you agree, why not thank vid1900

Quote from MaroonLeopard1601 :
What would be the difference between getting a fosi v3 / Douk a5 and this?
The Fosi v3 only puts out 34wpc into 8 ohms with the stock power supply...so you need to buy the 48v supply to get the 89 watts.

The Fosi lacks the XLR inputs

The Fosi lacks the 12v turn on circuit

The Fosi is a great little amp, but not in the same league as the Monolith.
3
Today 10:06 PM
400 Posts
Joined May 2016
VolumnusToday 10:06 PM
400 Posts
Quote from vid1900 :
The Fosi v3 only puts out 34wpc into 8 ohms with the stock power supply...so you need to buy the 48v supply to get the 89 watts.

The Fosi lacks the XLR inputs

The Fosi lacks the 12v turn on circuit

The Fosi is a great little amp, but not in the same league as the Monolith.
I have the Fosi V3 with the 48V power supply. They are down to around $80 in open box condition on eBay. To get around the on/off issue, I use a master/slave power strip. It also turns my Aircom cooler on and off with the receiver. The Cyberpower power strip was only $15. If I were using the external amp to push my fronts, I'd go with the Monolith (for twice the cost of the Fosi and a master/slave power strip), but I'm just using it to push two wide speakers that are barely even utilized.
1
1
Today 10:42 PM
168 Posts
Joined Sep 2018
MaroonLeopard1601Today 10:42 PM
168 Posts
Quote from Volumnus :
I have the Fosi V3 with the 48V power supply. They are down to around $80 in open box condition on eBay. To get around the on/off issue, I use a master/slave power strip. It also turns my Aircom cooler on and off with the receiver. The Cyberpower power strip was only $15. If I were using the external amp to push my fronts, I'd go with the Monolith (for twice the cost of the Fosi and a master/slave power strip), but I'm just using it to push two wide speakers that are barely even utilized.
Would the monolith be better than the amps I mentioned if I'm looking to run a 2.1 setup with Elac Debut 3.0 / Emotiva XB2? (although still researching bookshelfs. I did try the KEF LSX II from costco, loved the dispersion and soundstage on it) will also be using the wiim ultra as a preamp. Sorry I'm still noob when it comes to ohms and watts. Will be in an apartment but I do like things loud sometimes.
Last edited by MaroonLeopard1601 July 3, 2026 at 03:46 PM.
Today 11:07 PM
235 Posts
Joined Feb 2011
sbattosaiToday 11:07 PM
235 Posts
Good to add that it's a class AB amplifier (I thought it was a class D)

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