Dual SVS PB-2000s to replace dual ChaseHT SS-18.1s. Worth it? - Page 4 - AVS Forum
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post #91 of 101 Old 01-10-2014, 08:55 AM
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No, not ringing, you are talking +/- 2.5 dBs and how we listen, 1/6th smoothing the line is flat. I have a little crossover work to do at 80hz but that is it. This is a mighty $229 Sony AVR LFE out!

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post #92 of 101 Old 01-10-2014, 09:10 AM
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Quote:
Originally Posted by MKtheater View Post

Here is my response


Wow! now that's nice MK. Congrats! Talk about extension. cool.gif

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post #93 of 101 Old 01-10-2014, 09:30 AM
 
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Quote:
Originally Posted by MKtheater View Post

No, not ringing, you are talking +/- 2.5 dBs and how we listen, 1/6th smoothing the line is flat. I have a little crossover work to do at 80hz but that is it. This is a mighty $229 Sony AVR LFE out!

Thanks. I should be so lucky to get such a nice graph. Today I put a receiver into play that has XT32/SubEQ HT so I'm holding out hope for an improvement.

Here's the before XT32/SubEQ HT graph; two FV15HPs:



Nothing close to the extension you're getting. Once the receiver is up and running, I'll see what I can do to extend the left side of the graph as I should be getting five Hz more. Still, nothing close to what you're getting.

-
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post #94 of 101 Old 01-10-2014, 09:40 AM
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Hey Bee.. This is a old quote from Brian/Rythmik. You might see if you can break all the rules and incorporate the BASSIS and see what you can come up with.

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The Marchand BASSIS unit and the BFD are really different animals. The BFD is a parametric EQ whereas the BASSIS is an adjustable Linkwitz Transform Circuit. The BASSIS will allow you to lower the low frequency response of a sealed enclosure by adding boost but at the same time you can adjust the Qtc of the entire system.

So I don't think you can really compare the two. Actually, when I get my huge 18" sub built I'll use either the BASSIS unit or a custom built LT circuit strictly for my sub AND a BFD (to tame any peaks).

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post #95 of 101 Old 01-10-2014, 09:45 AM
 
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...confused.gif

I'm way over my head as it is. Getting a new receiver up and running with XT32/SubEQ HT and subwoofers worth a Tinker's Damn is far more than I every dreamed possible.

If I were to try and break any rules, I'd like to do so by adding a PSA XS30. If I did that, I'm told that I'd be messing with the whole time continuum thingy and last I read, that's not good.

(Excuse me, Egon, you said crossing the streams was bad.)

...tongue.gif

-
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post #96 of 101 Old 01-10-2014, 12:05 PM
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Quote:
Originally Posted by BeeMan458 View Post

...confused.gif

I'm way over my head as it is. Getting a new receiver up and running with XT32/SubEQ HT and subwoofers worth a Tinker's Damn is far more than I every dreamed possible.

If I were to try and break any rules, I'd like to do so by adding a PSA XS30. If I did that, I'm told that I'd be messing with the whole time continuum thingy and last I read, that's not good.

(Excuse me, Egon, you said crossing the streams was bad.)

...tongue.gif

-

although CR has successfully integrated two PB ultras, and an xs30...just sayin'

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post #97 of 101 Old 01-10-2014, 12:31 PM
 
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although CR has successfully integrated two PB ultras, and an xs30...just sayin'

Thanks. I'll ask him what the process was for his success.
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post #98 of 101 Old 01-10-2014, 01:13 PM
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Quote:
Originally Posted by BeeMan458 View Post

Thanks. I should be so lucky to get such a nice graph. Today I put a receiver into play that has XT32/SubEQ HT so I'm holding out hope for an improvement.

Here's the before XT32/SubEQ HT graph; two FV15HPs:



Nothing close to the extension you're getting. Once the receiver is up and running, I'll see what I can do to extend the left side of the graph as I should be getting five Hz more. Still, nothing close to what you're getting.

-
I think the problem is your mic is not calibrated to measure below 20hz. You will find out if your graph will be similar with your Denon 4520.
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post #99 of 101 Old 02-25-2014, 06:38 PM - Thread Starter
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Today I spent ~5-1/2 hrs. trying out a few combinations of spots for my subs:
1. Front left inside (between left main and CC) and back right corner (in front of the half wall).
2. Front left corner and front left inside.
3. Front left corner and front right inside.

After all that, the best spot for the subs turned out to be....their usual spots: Front left inside and front right inside.

I get the best overall FR there, flat to - but, dammit, never below - 17Hz.

In the FR graph:
- brown is the left seat (Audyssey on)
- red is the middle console (Audyssey on)
- orange is the middle console (Audyssey off)
- black is the right seat (Audyssey on)



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post #100 of 101 Old 02-25-2014, 06:42 PM
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Aside from what graph looks the best, what position do the subs sound the best?

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post #101 of 101 Old 02-25-2014, 06:47 PM - Thread Starter
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I didn't actually audition each of the combinations of positions. Basically, after gain-matching the subs, I:
- put them in a position;
- ran the first cycle of Audyssey;
- measured the subs with Audyssey off and then with it on.

All of the positions were roughly equally flat up to crossover. Position 1 offered the worst extension - it was down by 6dB from peak at ~25Hz. Positions 2 and 3 were better, but because they were almost comparable to the "usual spots", I opted to go with it for symmetry because:
- I like symmetry cool.gif ; and
- the system still sounds good set up that way.

Although I'm not in a hurry to do it again any time soon, it was a pretty interesting exercise. smile.gif
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