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Sealed Stereo Integrity HT-18D2 [build thread] - Page 3

post #61 of 72
1/24/13 at 7:52am
Thread Starter 
No - I was able to sell that. I'm using an iNuke NU6000 + Mini DSP.
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Originally Posted by JohnDean View Post

What amp did you end up with, still using the Bash500?
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post #62 of 72
1/26/13 at 9:56am
Thread Starter 
2nd driver arrived in good shape this morning. My helper was as excited as I was.


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post #63 of 72
2/1/13 at 7:10am
Thread Starter 
Thought I'd share this. Comparison of 1 vs 2 subs. No EQ, no Audyssey, no crossover in place.



I'm going to remeasure this weekend. One of my mdat files with post-Audyssey measurements got corrupted somehow.

I posted this graph earlier - this is pre and post Audyssey when I had just the first sub. There is way too much <15hz boost in my opinion. Here's my question - if I apply an HPF before I run Audyssey to discourage it from boosting so aggressively in the ULF, would I potentially have phase issues if I disable the HP afterward? Second scenario being I start with a steep 4th order and change to 2nd order after Audyssey.

I've read that HPF's can influence phase in the passed region. If Audyssey does it's job right with my distances and whatever time-domain stuff it does, I could potentially throw it out of wack by disabling the HP. Is that a correct understanding? My Onkyo has MultEQ XT. My goal is not to kill all the LF stuff, but rather let the sealed boxes do their rolloff job to protect the drivers. Audyssey wants none of that and thinks I should be flat to 5hz or lower.

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post #64 of 72
2/1/13 at 7:26am
I always EQ over Audyssey as I find it gets close but I can do better.

Just apply a 1st order butterworth where you want it to start rolling off after the Audyssey does its thing. The "phase" issue introduced should be unimportant, especially since your interested in decreasing output.

You can see the phase implications by looking at the group delay plot. Anywhere you apply significant eq prob indroduces some GD.
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post #65 of 72
2/1/13 at 7:26am
is that Post Audyssey sweep with Dynamic EQ on or off?
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post #66 of 72
2/1/13 at 8:49am
Thread Starter 
Off. My receiver doesn't have it. TX-SR805.
Quote:
Originally Posted by brian6751 View Post

is that Post Audyssey sweep with Dynamic EQ on or off?
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post #67 of 72
2/1/13 at 9:05am
are you using inuke DSP to drive the subs? then just set the limiters to whatever you think is safe power level.


that curve looks rather mild to me. if anything you may want to make it steeper for the equal loudness contour match.
Edited by zheka - 2/1/13 at 9:16am
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post #68 of 72
2/1/13 at 9:47am
Thread Starter 
I've got the non-DSP version. Already had a Mini DSP.
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post #69 of 72
2/1/13 at 12:25pm
Quote:
Originally Posted by baniels View Post

I've got the non-DSP version. Already had a Mini DSP.

perhaps you can get the same result with gain controls. 2000W per driver may be a bit too hot even without any EQ boost.

i think for sealed boxes, a better way to protect drivers is to make the system power limited before the driver excursion limits are reached.

My understanding is that as a safety device HPF are mostly used for vented subs where drivers may unload with very modest power applied.
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post #70 of 72
2/11/13 at 7:42am
Thread Starter 
Granite complete.





I had to go with a new placement. I had originally placed the speakers on the outside of the subs. There were some nasty dips between 50 and 90 hz from the mains as a result. Swapping the placement with the mains took care of it. The subs are now seeing a dip at around 65 hz, but it is narrower. I may experiment a little more with placement of the subs, but I don't have a lot of options. It sounds darn good though.

New placement


Mains inside the subs vs outside the subs.
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post #71 of 72
2/11/13 at 10:55am
What are the external measurements of the box??
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post #72 of 72
2/11/13 at 10:57am
Never mind didn't see the link to the build. Thanks
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AVS › AVS Forum › Audio › DIY Speakers and Subs › Sealed Stereo Integrity HT-18D2 [build thread]