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expired Posted by TattyBear | Staff • Dec 15, 2023
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expired Posted by TattyBear | Staff • Dec 15, 2023

Monoprice Monolith Multi‑Channel Home Theater Power Amplifier: M3100X 3x90W $345 + Free Shipping

$345

$500

31% off
Monoprice
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Monoprice Monolith [monoprice.com] has Multi‑Channel Home Theater Power Amplifier: M3100X 3x90W on sale for $344.99 when you apply coupon code MERRY5 in cart - Shipping is Free
  • M3100X Features:
    • 3 Channels of Amplification
    • 90 Watts Per Channel into 8 ohms
    • Unbalanced RCA Inputs
    • XLR Inputs
    • 3RU Height
    • Class AB Amplification
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Deal Details
Community Notes
About the Poster
Monoprice Monolith [monoprice.com] has Multi‑Channel Home Theater Power Amplifier: M3100X 3x90W on sale for $344.99 when you apply coupon code MERRY5 in cart - Shipping is Free
  • M3100X Features:
    • 3 Channels of Amplification
    • 90 Watts Per Channel into 8 ohms
    • Unbalanced RCA Inputs
    • XLR Inputs
    • 3RU Height
    • Class AB Amplification

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Model: Monolith by Monoprice M3100X 3x90 Watts Per Channel Multi-Channel Home Theater Power Amplifier with RCA & XLR Inputs

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Sort: Lowest to Highest | Last Updated 7/15/2025, 07:04 PM
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Monoprice.com$449.99

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41 Comments

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Dec 19, 2023
16 Posts
Joined Feb 2015
Dec 19, 2023
Nicemaneuvers
Dec 19, 2023
16 Posts
I picked this up around Black Friday, looks like the price has come down a little since then! This provided a good entry point for me into the world of audio separates. I use it to power my front LCR trio of Monolith THX-365; does a great job.
Dec 19, 2023
202 Posts
Joined May 2011
Dec 19, 2023
camaro748
Dec 19, 2023
202 Posts
Quote from Nicemaneuvers :
I picked this up around Black Friday, looks like the price has come down a little since then! This provided a good entry point for me into the world of audio separates. I use it to power my front LCR trio of Monolith THX-365; does a great job.
I'm thinking of getting this amp and the monolith thx 365 in wall speakers too. How are they?
Dec 19, 2023
1,702 Posts
Joined Jun 2023
Dec 19, 2023
LovelySparrow901
Dec 19, 2023
1,702 Posts
These amps are NOT built by ATI, unlike the earlier Monolith models, correct?
1
1
Dec 19, 2023
139 Posts
Joined Nov 2014
Dec 19, 2023
Elitoh
Dec 19, 2023
139 Posts
Overkill for Klipsch rp-8000f's and a 504c?
1
Dec 19, 2023
90 Posts
Joined Apr 2008
Dec 19, 2023
jturnbull65
Dec 19, 2023
90 Posts
I picked up the DefTech D17s that have been on sale and upon reading that they are power hungry have been looking at the picking up this monoprice 3 channel amp or emotiva basX A3. Thoughts?
Dec 19, 2023
183 Posts
Joined Nov 2010
Dec 19, 2023
slothv
Dec 19, 2023
183 Posts
I never really understood if these were worth it… Would this have any noticeable improvement over a Denon 3400h? Running 5.1.2 setup for home theater.
Dec 19, 2023
906 Posts
Joined Nov 2012
Dec 19, 2023
TheSchlaf
Dec 19, 2023
906 Posts
Quote from Elitoh :
Overkill for Klipsch rp-8000f's and a 504c?
In what size room? I'd say if you have 100W/channel already, no.

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Dec 19, 2023
4,943 Posts
Joined Dec 2009
Dec 19, 2023
seanleeforever
Dec 19, 2023
4,943 Posts
Quote from slothv :
I never really understood if these were worth it… Would this have any noticeable improvement over a Denon 3400h? Running 5.1.2 setup for home theater.
depend on speakers you have. but i'd argue most of speaker don't actually need something like this except electrostatic speakers, which are typically low in efficiency.


another benefit i see with dedicated AMP is that you no longer have to throw away that portion of system when a new video standard come out. more often than not it is the video chipset get out dated.
1
Dec 19, 2023
567 Posts
Joined Apr 2012
Dec 19, 2023
e_honda
Dec 19, 2023
567 Posts
Quote from Elitoh :
Overkill for Klipsch rp-8000f's and a 504c?
Given they are pretty sensitive as most Klipsch's are, yeah it's likely overkill and I doubt you'd notice much in of a difference (if any) over just any decent AVR.
Dec 20, 2023
1,390 Posts
Joined Nov 2003
Dec 20, 2023
JesusFreak
Dec 20, 2023
1,390 Posts
Quote from e_honda :
Given they are pretty sensitive as most Klipsch's are, yeah it's likely overkill and I doubt you'd notice much in of a difference (if any) over just any decent AVR.
Klipsch sensitivity values should not be trusted.
1
Dec 20, 2023
234 Posts
Joined Nov 2016
Dec 20, 2023
ninjewz
Dec 20, 2023
234 Posts
I have the 5 channel version of this and have been happy. It's powering SVS Ultra LCR bookshelves and XTZ Spirit 6 surrounds and I have no complaints yet. I want to expand my system and add Atmos speakers as well so it'll keep my system happy in the long run.
Last edited by ninjewz December 19, 2023 at 07:43 PM.
Dec 20, 2023
573 Posts
Joined Jul 2016
Dec 20, 2023
jborage
Dec 20, 2023
573 Posts
Quote from slothv :
I never really understood if these were worth it… Would this have any noticeable improvement over a Denon 3400h? Running 5.1.2 setup for home theater.
I added an outlaw amp to my denon x3500h and I can't tell you I notice a difference
Dec 20, 2023
203 Posts
Joined Sep 2018
Dec 20, 2023
jbtay
Dec 20, 2023
203 Posts
Quote from slothv :
I never really understood if these were worth it… Would this have any noticeable improvement over a Denon 3400h? Running 5.1.2 setup for home theater.
What speakers do you have?

Ordinarily no as the amperage on your unit is similar to this with 105W @ 8 ohms.

I would not spend the money.
1
Dec 20, 2023
203 Posts
Joined Sep 2018
Dec 20, 2023
jbtay
Dec 20, 2023
203 Posts
Quote from jborage :
I added an outlaw amp to my denon x3500h and I can't tell you I notice a difference
You are comparing apples to oranges. Again your amp is 105w. This amp specifically by monolith will not be a good investment.

Which outlaw? The mono's? If so those are 200W conservatively, so it's a 90w boost. If it's the 5 series then it's still higher I believe 130w which would be a 25w boost over the monolith so not a good comparison.
Last edited by jbtay December 19, 2023 at 08:12 PM.
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Dec 20, 2023
16 Posts
Joined Feb 2015
Dec 20, 2023
Nicemaneuvers
Dec 20, 2023
16 Posts
Quote from camaro748 :
I'm thinking of getting this amp and the monolith thx 365 in wall speakers too. How are they?
Should've specified, I have the 365T mini-towers, not the in-wall versions. How are they...it's a little tough to answer briefly: In my viewing room, this combo is overkill because my total room depth (viewing position to screen) is only 9', so the power of the LCR is kind of overwhelming. The 365T are an enormous step up from my previous Klipsch towers / WTW center channel, but out-of-the-box they don't have quite as much low-frequency extension as I expected. I watched Erin's Audio Corner review of the 365T and plan on running Dirac Live on my full setup (after I receive my miniDSP) - I plan on following Erin's recommendations regarding EQing the 365Ts. Hopefully that makes some sense/provides some useful insight.

Oh, I should add: my main motivation for getting the amp despite my tiny room was (a) the 365T are 4-Ohm nominal impedance, so I wasn't confident in my receiver handling them, and (b) I just wanted to go the separates route and this seemed to be a decent entry point. I'll probably replace the LCR trio well before upgrading the power amplifier.
Last edited by Nicemaneuvers December 19, 2023 at 08:52 PM.

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