Introducing My Monolith Speakers - AVS Forum
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post #1 of 20 Old 05-11-2014, 02:30 PM - Thread Starter
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Earlier this year I decided that the hybrid tower loudspeakers weren't a good choice for my entertainment room. They were just too tall for my wife's liking and I wasn't entirely satisfied with the sound quality. Here is what they looked like:




So I decided to try something different, and this is what I came up with:








The drivers are an Eminance Kappa Lite 3012LF for the woofer in a rear vented enclosure, dual Faital Pro 8PR200 for midrange in a sealed enclosure, and a Beyma TPL-150H for the tweeter. Crossover is digital electronic using a DEQX HDP-4. Amps are Yamaha,, two P2500S's for the midrange and tweeter and a P5000S for the woofer.

This is the most realistic and dynamic speaker I have ever heard in my many homes over the years. Here is a plot of the frequency response I took in my workshop when I was doing the testing. The crossover in this case was an Ashly Protea 3x6 which has since been replaced with the DEQX.



Here are the amps and processor:


My next project is to replace the sealed subwoofers with vented ones.
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post #2 of 20 Old 05-11-2014, 03:44 PM
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What is the sensitivity?
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post #3 of 20 Old 05-11-2014, 04:10 PM - Thread Starter
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The sensitivity of the woofer is 95.5 dB/watt, the two mids have a combined sensitivity of 99dB/watt and the tweeter is at 102 dB. But so what, they are triamped.
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post #4 of 20 Old 05-11-2014, 04:18 PM
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remove th back cover on the beymas and give it a large chamber and u will drop distorion 20 or so db
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post #5 of 20 Old 05-11-2014, 04:25 PM
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Quote:
Originally Posted by fperra View Post

The sensitivity of the woofer is 95.5 dB/watt, the two mids have a combined sensitivity of 99dB/watt and the tweeter is at 102 dB. But so what, their triamped.

It matters at if they were not that high. Most 8" mids can't handle more then 300 watts and if they were 88 dbs it would be hard to reach reference level cleanly
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post #6 of 20 Old 05-11-2014, 05:16 PM - Thread Starter
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Originally Posted by cookieattk View Post

remove th back cover on the beymas and give it a large chamber and u will drop distorion 20 or so db

I removed the thick felt pad off the back of the tweeter and stuffed the chamber with BAF. Subjectively, I think it made an improvement.
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post #7 of 20 Old 05-11-2014, 08:47 PM
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Very nice project! Please tell me you've got the recycled cotton insulation in the mid chamber too, not just the woofer. I like the metallized damping sheet on the horn and rear chamber of the Beyma TPL. I think I'll do something like that once I modify the rear chamber of mine too.

Greg
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post #8 of 20 Old 05-11-2014, 08:52 PM
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I meant to ask, what was going on with the old towers? Were those some DIY electrostatic panels?

Greg
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post #9 of 20 Old 05-11-2014, 09:08 PM
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Saw your post over at partsexpress, awesome build!!!
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post #10 of 20 Old 05-11-2014, 10:06 PM - Thread Starter
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Quote:
Originally Posted by gbegland View Post

I meant to ask, what was going on with the old towers? Were those some DIY electrostatic panels?

Greg

Yes, DIY tweeter ESL panels, and they worked quite well. The lower frequencies didn't match up so well though.
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post #11 of 20 Old 05-11-2014, 10:35 PM
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What frequency did you cross the Beyma AMT at? Very nice build!!
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post #12 of 20 Old 05-12-2014, 07:49 AM - Thread Starter
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Quote:
Originally Posted by gbegland View Post

Very nice project! Please tell me you've got the recycled cotton insulation in the mid chamber too, not just the woofer. I like the metallized damping sheet on the horn and rear chamber of the Beyma TPL. I think I'll do something like that once I modify the rear chamber of mine too.

Greg

Yes the mid range chamber as stuffed with the recycled denim before it was sealed. The rigid closed cell foam with the metalized face was bonded to the inside walls to adjust the volume of the woofer chamber.
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What frequency did you cross the Beyma AMT at? Very nice build!!

1380 Hz at 96db/oct linear phase.
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post #13 of 20 Old 05-12-2014, 09:37 AM
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Very cool project.
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Originally Posted by fperra View Post

This is the most realistic and dynamic speaker I have ever heard in my many homes over the years.

This ^ is great to hear.

In my opinion, taking the approach with a pro driver platform, blending and refining those design choices into a highly capable loudspeaker system, is the platform to beat.

I just feel that optimizing a pro, high-sens/low-dist/high output approach, possesses greater potential upside for the experience I'm after.

If I were exploring options for a build right now, I'd be examining ways to incorporate the Beyma AMT, and find complementary choices to surround it with. There's a lot of other wonderful HF options out there too, ... just find the AMT compelling (despite the tight vertical).
Quote:
Originally Posted by fperra View Post

My next project is to replace the sealed subwoofers with vented ones.



A few additional questions;
I'm curious what your thought process is, changing sealed to vented, can you elaborate?
Also, the 4x8 processor in the image, what mfr. is that?
Do you have any polars of the new mains?

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(3)Seaton Cat12C up front, (4)QSC K8 sides/rears
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post #14 of 20 Old 05-12-2014, 09:50 AM - Thread Starter
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Quote:
Originally Posted by FOH View Post


A few additional questions;
I'm curious what your thought process is, changing sealed to vented, can you elaborate?
Also, the 4x8 processor in the image, what mfr. is that?
Do you have any polars of the new mains?

The processor is this: http://cncawboy.en.alibaba.com/product/1626511577-212290267/DP_MARK_IV_Digital_Speaker_Processor.html and is used for the woofers.

The resson I want to go vented is to get a lower F3 cutoff frequency without the need for so much equalization.
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post #15 of 20 Old 05-12-2014, 02:37 PM
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Quote:
Originally Posted by cookieattk View Post

remove th back cover on the beymas and give it a large chamber and u will drop distorion 20 or so db

How big a chamber?

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post #16 of 20 Old 05-12-2014, 02:43 PM
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i made mine 1cf ish filled it with poly
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Quote:
Originally Posted by cookieattk View Post

i made mine 1cf ish filled it with poly

Wow, 1cuft is very large. Even a few times larger than the standard backcup, filled with some bonded logic or other quality absorbent material will make a nice improvement. Also, remove the hard, reflective felt glued directly to the rear of the driver. At least on our pair, it was worthless.

Greg
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post #18 of 20 Old 05-12-2014, 07:24 PM
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Quote:
Originally Posted by gbegland View Post

Wow, 1cuft is very large. Even a few times larger than the standard backcup, filled with some bonded logic or other quality absorbent material will make a nice improvement. Also, remove the hard, reflective felt glued directly to the rear of the driver. At least on our pair, it was worthless.

Greg


it was more like 8x8x12 worked well.
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post #19 of 20 Old 05-16-2014, 09:50 PM
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Nice build, congrats.
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Originally Posted by cookieattk View Post

remove th back cover on the beymas and give it a large chamber and u will drop distorion 20 or so db

Really? Not questioning you here but I'd be interested in any measurements of this before and after as the TPL is on my 'want to try sometime' list.
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post #20 of 20 Old 05-16-2014, 10:44 PM
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wow, nice work...nice results!

Listen. It's All Good.
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