Your Home Theater ULF Score - Page 82 - AVS Forum
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post #2431 of 2442 Old 09-16-2014, 06:51 PM - Thread Starter
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Quote:
Originally Posted by eljaycanuck View Post
Thanks...and woo-hoo!! ;-)



Not sure about reference at 12.5Hz. The back-right corner seems to have little to no gain, so the FR curve for the SS-18s alone drops fast below ~40Hz or so.


Up front, the UXLs dig a bit deeper than the SS-18s used to, but I haven't tried forcing a "flat to 10Hz" curve on them yet and then seeing what kind of SPL I can get at the lower end.


Together, though, the subs play very well and I'm getting what I would describe as very smooth, "full" and deep bass, with more tactile effect than I've ever experienced (without even having to run the subs as hot as I used to).


1. I'll try to post a couple of graphs tonight.
2. If I get tired of quad subs (I can't see that happening any time soon), my next step would be to try ported cabs for the UXLs and see how a pair would compare to what I've got right now.
Good to know that reality is fairly close to the ULF score estimate.

Quote:
Originally Posted by eljaycanuck View Post
Here's the graph (+/-3dB to 16Hz, 80Hz x-over), with:
- yellow = SS-18s (Aud off)
- green = UXLs (Aud off)
- red = all subs (Aud off)
- black = all subs (Aud on)
Quote:
Originally Posted by eljaycanuck View Post
No, that's room positioning. Here's a graph of the UXLs in those spots vs. the SS-18s in the same spots a few months ago:
- Audyssey off
- black = UXLs (w/ 80Hz x-over)
- red = SS-18s (w/ 200Hz x-over)
I still think there's something wrong with your setup or measuring gear. That drop is very strange...and you can't EQ through it? Have you tried playing with the phase real time? I would play with the phase until the dip goes away, and then eq the other parts of your response until you are flat.


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post #2432 of 2442 Old 09-16-2014, 06:54 PM
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I'll try playing with phase, but that dip has always been there, whether it's been one sub or two up front, ported or sealed.


The only time the dip hasn't been there was when I forced a "flat to 10Hz" curve onto the SS-18s - see details in this post.


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Last edited by eljaycanuck; Yesterday at 04:11 AM.
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post #2433 of 2442 Old 09-16-2014, 07:03 PM - Thread Starter
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Quote:
Originally Posted by dominguez1 View Post
Nice cubalis, and good timing...

I had asked mk to run a sim of the lmsr-15 this weekend. He said at 20hz and below, it was only .5 db off from the 18in SI! Very impressive for a 15in sub...

I'll post the SI conversion later on this evening and will get it in the next update.


I'll say again...damn impressive for a 15in driver!
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post #2434 of 2442 Old 09-16-2014, 08:42 PM
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Laugsbach,
Nice! Can you post what gear you have and what boost you added with what EQ? I mean what processor, amp, EQ, etc.

For example mine was flat, no EQ, pioneer elite SC-81 and Sanway FP14K. I am going to buy 4 more SI's, 8 on the way, for my front wall and have been wondering what amp to use.
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post #2435 of 2442 Old Yesterday, 05:27 AM
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Originally Posted by MKtheater View Post
Laugsbach,
Nice! Can you post what gear you have and what boost you added with what EQ? I mean what processor, amp, EQ, etc.
Thanks MK...

I am going to put my LONG answer in spoilers...

Spoiler!
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post #2436 of 2442 Old Yesterday, 05:55 AM
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Originally Posted by dominguez1 View Post
Umm, when can I get a demo please? Upgradeitus still runs through your blood with that kind of response???
Yeah...I need you over for a demo next week!!!

Upgradeitus will never leave me...
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post #2437 of 2442 Old Yesterday, 11:09 PM
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I just discovered something weird, when I open my theater doors my response becomes flatter and deeper, 3hz deeper. Took me 1.5 years to just discover this tonight.
The room volume becomes the volume of the earth when I do this. (Opens to the world).

Red is mains, Blue is 8 more subs added.

Puzzling...
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post #2438 of 2442 Old Today, 04:15 AM - Thread Starter
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Quote:
Originally Posted by BassThatHz View Post
I just discovered something weird, when I open my theater doors my response becomes flatter and deeper, 3hz deeper. Took me 1.5 years to just discover this tonight.
The room volume becomes the volume of the earth when I do this. (Opens to the world).

Red is mains, Blue is 8 more subs added.

Puzzling...
Perhaps your room becomes a big ported sub (Helmholtz Resonator) with a very low tune?
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post #2439 of 2442 Old Today, 04:32 AM
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just moved one of my xs30's next to my HT seats (MLP) and ordered a buttkicker LFE...what does that do to my ratings if anything?

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My first HT build thread
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post #2440 of 2442 Old Today, 05:35 AM
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Quote:
Originally Posted by BassThatHz View Post
I just discovered something weird, when I open my theater doors my response becomes flatter and deeper, 3hz deeper. Took me 1.5 years to just discover this tonight.
The room volume becomes the volume of the earth when I do this. (Opens to the world).

Red is mains, Blue is 8 more subs added.

Puzzling...
I have read in the past that people have the thing going on in their rooms. Kind of reminds me of my car stereo days. If you roll the window down a little bit, the subs sounded louder and deeper. Of course back then I did not have measuring equipment or even the thought of measuring to confirm this.


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post #2441 of 2442 Old Today, 05:54 AM
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Quote:
Originally Posted by BassThatHz View Post
I just discovered something weird, when I open my theater doors my response becomes flatter and deeper, 3hz deeper. Took me 1.5 years to just discover this tonight.
The room volume becomes the volume of the earth when I do this. (Opens to the world).

Red is mains, Blue is 8 more subs added.

Puzzling...
I discovered something similar years ago when I was measuring my response at the MLP. If I just leave my HT door cracked a few inches, I get about 2db more output at 15hz and below (my subs drop off around 12-13hz anyway). I always leave it cracked now.

JVC 3D: Been there, done that, bought a DLP
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post #2442 of 2442 Old Today, 06:48 AM
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You just increased the box so you are making it closer to IB which raises the sensitivity down low and lowers the F3 but the same power may blow them up. IB's require much less power so you will lose a little up top.
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