EXPERIMENTAL Quad JBL Devastator Build - Page 15 - AVS Forum | Home Theater Discussions And Reviews
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post #421 of 431 Old 04-28-2020, 08:32 PM
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I upgraded to the Dayton Audio SA1000 when Kylo Ren's force in the The Force Awakens caused the Yamaha to shut down at my preferred listening volume (40) on the Pioneer VSX-1022-K that I gave my son. I had to listen at 35 to keep the Yamaha from shutting down.

Sony XBR65x900e / STR-DN1080 / original PS4 / WOW! Ultra TV / Quantum Access Mini PC Stick w/Windows 10 / 8 x Rockville SPG88 8“ DJ PA Speakers / Dayton Audio SA1000 / Kicker 08S15L74 in a Tapped-Tapered Quarter Wave Tube (negative flare tapped horn).
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post #422 of 431 Old 04-28-2020, 08:33 PM - Thread Starter
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Originally Posted by BP1Fanatic View Post
I just went through this thread to find front chamber bracing. Yeah, you have bracing over the front of the speakers. Bracing can be applied below the speakers between the speaker panel and front panel. With a hatch front panel, you could have ribs on it in front of the speakers. You can apply crazy bracing behind the speakers.

My enclosure is only 16" wide and 30.75" tall internally. 10ft horn going from a 9" throat to a 5" mouth. Hoffman's Law, I chose small and low. T-TQWT is the least efficient TH. Yet with less than 200 watts from an old AVR, it cracked walls on multiple floors.

Again, feel free to build a quad and try it out. The quad is easier to play with bracing than the single large drivers too.

To me, proper bracing of the qw is the most important part of the cab.
So I will continue to build rear-mount dev’s, until I come up with a better design, or someone else does.
Same reason I went with a side window instead of a front window on my v3. Added a significant amount of additional finishing on that cab, but didn’t risk compromising the most critical part. Also why I put in the effort for full-length rails.

I don’t believe any other v3 builds have bothered. And I haven’t heard any complaints about front panel flex. But I still chose to build the best I can.

Cracking walls... I’m shocked I haven’t yet. The amount of wall and ceiling flex I get is crazy. I’m sure it’ll crack eventually, but I’m enjoying it for now.

Chris
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post #423 of 431 Old 04-28-2020, 08:56 PM
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Man, the WHOLE side would be wicked with a clear panel!
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Sony XBR65x900e / STR-DN1080 / original PS4 / WOW! Ultra TV / Quantum Access Mini PC Stick w/Windows 10 / 8 x Rockville SPG88 8“ DJ PA Speakers / Dayton Audio SA1000 / Kicker 08S15L74 in a Tapped-Tapered Quarter Wave Tube (negative flare tapped horn).
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post #424 of 431 Old 04-28-2020, 08:57 PM
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You could have fun with some LED's inside!

Sony XBR65x900e / STR-DN1080 / original PS4 / WOW! Ultra TV / Quantum Access Mini PC Stick w/Windows 10 / 8 x Rockville SPG88 8“ DJ PA Speakers / Dayton Audio SA1000 / Kicker 08S15L74 in a Tapped-Tapered Quarter Wave Tube (negative flare tapped horn).
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post #425 of 431 Old 05-01-2020, 08:24 AM
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I have that first cabinet connected and running in my theater room. I left it on the rolling dolly until I get a chance to fully test it in a few different places.

I got the mini DSP also, but I haven't put it in line yet, just using the LPF in the receiver to send 90Hz and down to it right now. On 600 watts I wouldn't call it terrifyingly loud, but the rest of the humans in the house aren't so sure. Good thing I am building a second one!

Paradigm 11se mk3, Paradigm Studio Monitor 100 original version with matching center, 5 Adcom 565's, 2 Adcom 585's, 4 Adcom 555's, HK PT2300, Acurus ACT3, 6 Wharfedale Sapphire 89's with dual 6" woofers, 6" mid, and 1".
Home Theater build thread: https://www.avsforum.com/forum/19-de...t-theater.html
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post #426 of 431 Old 05-01-2020, 09:45 AM - Thread Starter
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Quote:
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I have that first cabinet connected and running in my theater room. I left it on the rolling dolly until I get a chance to fully test it in a few different places.

I got the mini DSP also, but I haven't put it in line yet, just using the LPF in the receiver to send 90Hz and down to it right now. On 600 watts I wouldn't call it terrifyingly loud, but the rest of the humans in the house aren't so sure. Good thing I am building a second one!

Careful running without a hpf. Very easy to cause damage to the drivers.

The jbl’s are pretty durable, as proven by the BOSS guys, but still risky.

Chris
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post #427 of 431 Old 05-01-2020, 10:45 AM
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I have been playing music that doesn't contain any crazy low stuff. Lot's of upper bass, 70 to 90 region.

But yes, I will be putting the MiniDSP in tonight or tomorrow.

Paradigm 11se mk3, Paradigm Studio Monitor 100 original version with matching center, 5 Adcom 565's, 2 Adcom 585's, 4 Adcom 555's, HK PT2300, Acurus ACT3, 6 Wharfedale Sapphire 89's with dual 6" woofers, 6" mid, and 1".
Home Theater build thread: https://www.avsforum.com/forum/19-de...t-theater.html
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post #428 of 431 Old 05-03-2020, 06:10 PM
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Mini DSP installed, HPF put in at 19hz.

Did some basic checks on the room, moved the sub around a bit to see what I had for response. I have big peaks at 70 and 30, and big nulls at 60 and 80. Obviously these change depending on where things are. More work to be done on bass traps, and moving the sub around to determine the best locations for it.

I bought a umik-1 and installed REW. Not going to actually EQ it until I have things located for the best response.

It hits 105dbz at my listening position without even trying at 70 hertz. I doubt I could boost 60 or 80 hertz enough as they are down to around 60dbz at the worst listening position.

Pretty normal really, just beginning the journey!

Paradigm 11se mk3, Paradigm Studio Monitor 100 original version with matching center, 5 Adcom 565's, 2 Adcom 585's, 4 Adcom 555's, HK PT2300, Acurus ACT3, 6 Wharfedale Sapphire 89's with dual 6" woofers, 6" mid, and 1".
Home Theater build thread: https://www.avsforum.com/forum/19-de...t-theater.html
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post #429 of 431 Old 05-11-2020, 09:50 PM
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Relocated the sub into the front right corner and that limited the severity of the nulls. It is still laying on it's side with the ports to the right, so the ports were all near the wall.

I didn't break out the mic and laptop to measure anything, maybe tomorrow, it sounds better though, and I am happy about that.

Paradigm 11se mk3, Paradigm Studio Monitor 100 original version with matching center, 5 Adcom 565's, 2 Adcom 585's, 4 Adcom 555's, HK PT2300, Acurus ACT3, 6 Wharfedale Sapphire 89's with dual 6" woofers, 6" mid, and 1".
Home Theater build thread: https://www.avsforum.com/forum/19-de...t-theater.html
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post #430 of 431 Old 05-21-2020, 01:30 PM
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Here is a close mic graph. The lower line was me moving the mic back a few more inches to check that nothing crazy was happening. Seems to work as designed. I didn't measure power in any way, but this had to be down pretty far not to clip the mic.
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Paradigm 11se mk3, Paradigm Studio Monitor 100 original version with matching center, 5 Adcom 565's, 2 Adcom 585's, 4 Adcom 555's, HK PT2300, Acurus ACT3, 6 Wharfedale Sapphire 89's with dual 6" woofers, 6" mid, and 1".
Home Theater build thread: https://www.avsforum.com/forum/19-de...t-theater.html
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post #431 of 431 Old 05-22-2020, 02:32 PM
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Quote:
Originally Posted by jmilleril View Post
Mini DSP installed, HPF put in at 19hz.

Did some basic checks on the room, moved the sub around a bit to see what I had for response. I have big peaks at 70 and 30, and big nulls at 60 and 80. Obviously these change depending on where things are. More work to be done on bass traps, and moving the sub around to determine the best locations for it.

I bought a umik-1 and installed REW. Not going to actually EQ it until I have things located for the best response.

It hits 105dbz at my listening position without even trying at 70 hertz. I doubt I could boost 60 or 80 hertz enough as they are down to around 60dbz at the worst listening position.

Pretty normal really, just beginning the journey!
Great job getting the hpf in. Always good to have insurance.
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