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expired Posted by TattyBear | Staff • Feb 10, 2023
expired Posted by TattyBear | Staff • Feb 10, 2023

Monolith by Monoprice M-215 Dual 15in THX Certified Ultra 2000-Watt Powered Subwoofer $1900 + Free Ship

$1,900

$2,500

24% off
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Monolith by Monoprice [monoprice.com] has M-215 Dual 15in THX Certified Ultra 2000-Watt Powered Subwoofer (38543) for $1900
Shipping is Free
  • Specs:
    • Dimensions (LxWxH) 27.6" x 20.0" x 42.3" (700 x 508 x 1075 mm)
    • Weight 216 lbs. (98 kg)
    • 2000 watts (RMS)/3600 watts (peak)
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Deal Details
Community Notes
About the Poster
Monolith by Monoprice [monoprice.com] has M-215 Dual 15in THX Certified Ultra 2000-Watt Powered Subwoofer (38543) for $1900
Shipping is Free
  • Specs:
    • Dimensions (LxWxH) 27.6" x 20.0" x 42.3" (700 x 508 x 1075 mm)
    • Weight 216 lbs. (98 kg)
    • 2000 watts (RMS)/3600 watts (peak)

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Model: Monolith by Monoprice M-215 Dual 15in THX Certified Ultra 2000-Watt Powered Subwoofer

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Sort: Lowest to Highest | Last Updated 4/30/2025, 06:47 PM
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Monoprice.com$2,499.99
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24 Comments

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Feb 11, 2023
137 Posts
Joined May 2011
Feb 11, 2023
smiles07
Feb 11, 2023
137 Posts
Sheesh 2000 watts... This thing must make the home foundation shake!!
Feb 11, 2023
9 Posts
Joined Feb 2020
Feb 11, 2023
Tboostin
Feb 11, 2023
9 Posts
I really been looking at this…
Pro
Feb 11, 2023
1,866 Posts
Joined Sep 2016
Feb 11, 2023
vid1900
Pro
Feb 11, 2023
1,866 Posts

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

I've been following this sub to get a second unit.

This is a pretty good price, but it sometimes dips as low as $1750 , so keep that in mind.

This sub has amazing output!

https://www.youtube.com/watch?v=JX-r6ZNhTIs
3
Pro
Feb 12, 2023
2,767 Posts
Joined Aug 2005
Feb 12, 2023
leecm
Pro
Feb 12, 2023
2,767 Posts
Would this be too much for Klipsch rp-8000, rp-504c, and rp-600 system?
Feb 12, 2023
1,420 Posts
Joined Jan 2008
Feb 12, 2023
chronage
Feb 12, 2023
1,420 Posts
Quote from leecm :
Would this be too much for Klipsch rp-8000, rp-504c, and rp-600 system?
I have the same speakers. 4 of these subs should do the trick. Let us know how it goes
1
Feb 13, 2023
226 Posts
Joined Sep 2011

This comment has been rated as unhelpful by Slickdeals users.

Feb 13, 2023
1,159 Posts
Joined Jul 2009
Feb 13, 2023
ViciousXUSMC
Feb 13, 2023
1,159 Posts

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

As someone who has 4x of the 15" single versions, and did all the work to get them calibrated and tuned.

I can tell you that even 1 of these is enough to fill a pretty large normal room space with tons of bass, but bass is about way more than output. Its about room modes, wave lengths positioning, etc.

You cant get good coverage with just one sub, or multiple subs in one location.

So unless you have a ton of space and plan to get more than one of these, I would say you are much better off getting the single versions and placing them in different places rather than trying to jump on this and get just one of these.

This will make it easier to power (1000w), easier to place (smaller size), and provide better coverage, so even if your comparing one of these to two single 15's and you think this will save you a few hundred dollars, the performance increase you will get with proper placement of multiple subs and other conveniences is easily worth the extra money.

And if you ever scale up from say 2, to 3 or 4. It's easier to scale.

With 4x 15's I can fill the whole house, and knock stuff off the walls in every room, nearly shattered the sliding glass door to the back patio and that is with the gain at like 50% and not turned up all the way on my AVR.

4x of these would just be impossible to contain without a dedicated build space, and you would never be able to turn them up without ear protection.
1

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Feb 13, 2023
74 Posts
Joined Dec 2018

This comment has been rated as unhelpful by Slickdeals users.

Feb 13, 2023
3,564 Posts
Joined Mar 2007
Feb 13, 2023
notnotadude
Feb 13, 2023
3,564 Posts
Quote from chronage :
I have the same speakers. 4 of these subs should do the trick. Let us know how it goes
That sounds like the cause of the recent earthquakes in turkey.
1
1
Feb 13, 2023
615 Posts
Joined Jul 2022
Feb 13, 2023
LivelyManatee460
Feb 13, 2023
615 Posts
Don't forget all THX Ultra certified subwoofers are designed to pressurize rooms 3000 cubic feet and up to 12 feet from the screen, and because of the stacked design they are definitely home rattlers. Vented output is about 116db in the audible 20hz and in the infrasonic bands 100-110db from 12-16hz. Distortion is also extremely low as well!
Feb 13, 2023
169 Posts
Joined Oct 2011
Feb 13, 2023
derpingit
Feb 13, 2023
169 Posts
Quote from LivelyManatee460 :
Don't forget all THX Ultra certified subwoofers are designed to pressurize rooms 3000 cubic feet and up to 12 feet from the screen, and because of the stacked design they are definitely home rattlers. Vented output is about 116db in the audible 20hz and in the infrasonic bands 100-110db from 12-16hz. Distortion is also extremely low as well!
Hi friendo. Do you think this will fill 6000ft3 ? My kitchen and livingroom are open layout so it's much more space to fill . Ty
Pro
Feb 13, 2023
92 Posts
Joined Nov 2016
Feb 13, 2023
doubleedgedpen
Pro
Feb 13, 2023
92 Posts
Quote from ViciousXUSMC :
As someone who has 4x of the 15" single versions, and did all the work to get them calibrated and tuned.

I can tell you that even 1 of these is enough to fill a pretty large normal room space with tons of bass, but bass is about way more than output. Its about room modes, wave lengths positioning, etc.

You cant get good coverage with just one sub, or multiple subs in one location.

So unless you have a ton of space and plan to get more than one of these, I would say you are much better off getting the single versions and placing them in different places rather than trying to jump on this and get just one of these.

This will make it easier to power (1000w), easier to place (smaller size), and provide better coverage, so even if your comparing one of these to two single 15's and you think this will save you a few hundred dollars, the performance increase you will get with proper placement of multiple subs and other conveniences is easily worth the extra money.

And if you ever scale up from say 2, to 3 or 4. It's easier to scale.

With 4x 15's I can fill the whole house, and knock stuff off the walls in every room, nearly shattered the sliding glass door to the back patio and that is with the gain at like 50% and not turned up all the way on my AVR.

4x of these would just be impossible to contain without a dedicated build space, and you would never be able to turn them up without ear protection.
This! ^

Due to how low frequencies behave within a room, Two or more subwoofers are more often prefered over one larger subwoofer when trying to achieve even coverage.

This Monolith by Monoprice M-215 is amazing. But depending on your total budget, and end goal, you may be better served with two of the M-12 v2 model for the same price.
Last edited by doubleedgedpen February 13, 2023 at 11:55 AM.
Feb 13, 2023
838 Posts
Joined Oct 2009
Feb 13, 2023
dba_tech_99
Feb 13, 2023
838 Posts
Quote from vid1900 :
I've been following this sub to get a second unit.

This is a pretty good price, but it sometimes dips as low as $1750 , so keep that in mind.

This sub has amazing output!

https://www.youtube.com/watch?v=JX-r6ZNhTIs
This hits 1750 and I am biting. Fo sho.
Feb 13, 2023
1,159 Posts
Joined Jul 2009
Feb 13, 2023
ViciousXUSMC
Feb 13, 2023
1,159 Posts
Quote from doubleedgedpen :
This! ^

Due to how low frequencies behave within a room, Two or more subwoofers are more often prefered over one larger subwoofer when trying to achieve even coverage.

This Monolith by Monoprice M-215 is amazing. But depending on your total budget, and end goal, you may be better served with two of the M-12 v2 model for the same price.
I mean I would still go for the 15" version to keep the same frequency response if you really want the low lows. But I had severe coverage issues with just 2 subs upfront. I didn't know until I measured because honestly its hard to tell by ear, you really need measuring equipment for sub frequencies where our hearing range is not so great, and most sweeps we test with are fast moving.

Getting a 3rd sub and adding it to the back beside the sofa completely fixed all my issues, and then I got the 4th just for symmetry lol.

But I also picked up all 4 when they were $1199 or $1099 back in the day.

I have also since done a DIY 18" build that I use in the bedroom. If I didn't already have the monoliths I for sure would have gone 4x 18" sealed DIY subs.
Performance is insane and it hits ULF even better (without fear of blowing up below the tuning frequency of the port) and is quite musical on the higher end while taking up less space.

Attaching the sweep results in my main setup from all 3 main seating potions. I have yet to even see a professional paid setup done so well, and this is an open room.
I tuned it flat for my sweep before room correction and then have DIRAC add my room curve on the fly to boost the low end based on my content.

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Feb 14, 2023
2,286 Posts
Joined Jan 2009
Feb 14, 2023
HunterGatherer
Feb 14, 2023
2,286 Posts
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