My PB-10 measured room response

[j_garcia]

Here's my sub from the listening position (with correction factors):

160Hz - 74.5dB
142.5Hz - 77.5
125 - 78.5
111 - 79
100 - 64
89 - 82.5
80 - 88.5
71 - 76.5
63 - 80.5
56 - 72.5
50 - 76.5
45 - 82
40 - 85.5
36 - 83.5
31.5 - 84.5
28 - 82
25 - 82
22 - 81
20 - 83
18 - 82
16 - 75

Using 80Hz x-over, sub only tested. I haven't run a response curve with my mains on yet, so I don't know if the peak at 80Hz and big dip at 100Hz will be modified, though I suspect I will still have that big hump at 80Hz. Other than that, the response seems pretty good.

 

[Sheep]

very good. jees.

SheepStar

 

[mike c]

what correction factors? your BFD?
the 16-20 looks pretty good!

 

[j_garcia]

what correction factors? your BFD?
the 16-20 looks pretty good!

That is as-is, no BFD. Correction factors for the Radio Shack analog SPL meter.

16Hz you can't really hear so much as things just start vibrating. 18Hz I can hear the tone, but it is also mostly vibration - you can really feel the activation of the air in the room. I was surprised there was any decent output at 16Hz.

 

[Ron Temple]

I think you told me, but this was your system calibrated @ 75db at -10 running test tones at the various frequencies at your seating position, right? Looks very nice except at the problem dips.

Have you done any phase/crossover experiments ? I was watching the DD15 sofware(SMS 1) change the FR before my eyes on the fly via remote. What a great product. It can flatten out a room in minutes ( well some rooms anyway ).

 

[j_garcia]

Yes, that's at 75dB cal point. Now that I've plotted it and gotten some feedback from another forum, I'm not sure I would need to go with a BFD because I only have the one peak. The dip at 100 is more likely than not offset by my mains when they are running. I was busy all weekend so I didn't get a chance to rerun the tests with the mains on.

So you got the SMS from Velo? Did you get that other sub yet?

I have not done phase experiments yet, that will require 2 people most likely. 80Hz is the lowest available x-over for me.

 

[Ron Temple]

No just got to look at one in action . I'm in limbo for a few days on another sub. Let you know.

Thanks,

RT

 

[Tom Vodhanel]

Hi J Garcia,

You can improve the response curves by...

1)experimenting with different sub locations
2)experimenting with different mic locations(changing the seating positions)
3)adding acoustical treatments
4)adding EQ.(this usually only works well for peaks)

The response you measured isn't bad for an untreated room by any means (and true 16hz extension should never be ignored). With the BFD running at $99-119...it would surprise me if you could work the overall response down to something like +/- 2(or 3)dB from say 15hz to 80hz(the crossover point you are using for the low pass of the subwoofer).

Please don't hesitate to email SVS techsupport if you have any questions about EQing the sub in the future.

Tom V.
SVS

 

[edwelly]

Hi J Garcia,

You can improve the response curves by...

1)experimenting with different sub locations
2)experimenting with different mic locations(changing the seating positions)
3)adding acoustical treatments
4)adding EQ.(this usually only works well for peaks)

The response you measured isn't bad for an untreated room by any means (and true 16hz extension should never be ignored). With the BFD running at $99-119...it would surprise me if you could work the overall response down to something like +/- 2(or 3)dB from say 15hz to 80hz(the crossover point you are using for the low pass of the subwoofer).

Please don't hesitate to email SVS techsupport if you have any questions about EQing the sub in the future.

Tom V.
SVS

You said that the BFD probably would not work, do you think Velodyne's SMS would? Thanks..

P.S. by the way, love the subs!!!

 

[Tom Vodhanel]

Jeez, I apologize for that typo!

I meant to say...

"With the BFD running at $99-119...it WOULDN'T surprise me if you could work the overall response down to something like +/- 2(or 3)dB from say 15hz to 80hz(the crossover point you are using for the low pass of the subwoofer)."


sorry again..

Tom V.
SVS

 

[j_garcia]

Thanks Tom! The corner it lives in is unfortunately my only real good spot for it. The alternative is the opposite corner, 20ft away, as both walls adjacent to the current corner have sliding glass door or baseboard heaters.

 

[mulester7]

Thanks Tom! The corner it lives in is unfortunately my only real good spot for it. The alternative is the opposite corner, 20ft away, as both walls adjacent to the current corner have sliding glass door or baseboard heaters.

.....JGarcia, you love your GR Research fivesome, and your SVS PB 10, and you should....get another PB 10 and incorporate both under the front soundstage, and be ready to be mezmorized by what you would have......

 

[jaxvon]

.....JGarcia, you love your GR Research fivesome, and your SVS PB 10, and you should....get another PB 10 and incorporate both under the front soundstage, and be ready to be mezmorized by what you would have......

twoooooooooooooooooooooooooo








(I couldn't help it)

 

[Buckeyefan 1]

I don't know about you guys, but the room response from 18Hz to 89Hz seems outstanding to me. It's normal to have a few "dead" areas in your testing.

Try moving the sub closer/further from the corner a few inches. If you have a couch along one of the walls, try moving it away from the wall. I was doing some experimenting yesterday, and found these small tweaks really made quite a difference.

 

[j_garcia]

My couch is relatively in the center of the room (which is probably a big factor in that dip). The null has been there all along, including with my previous sub, and just a few feet away it goes away.

Unfortunately, I can't stack another PB-10 on top of this one because I have a CRT display and that would put the driver about a 18" away. This one already discolored my set when I pushed it into it's home. The next thing I'm going to play with is the phase, as this guy has a continuously variable phase adjustment (though that will also likely require 2 people).

 

[sweeppicker]

Hey Tom,
Does SVS have any new subs in the works ? Care to elaborate ? I'm looking to lose my SVS virginity this spring with Pb12 Ultra/2. Thanks.

 

[Ron Temple]

My couch is relatively in the center of the room (which is probably a big factor in that dip). The null has been there all along, including with my previous sub, and just a few feet away it goes away.

Unfortunately, I can't stack another PB-10 on top of this one because I have a CRT display and that would put the driver about a 18" away. This one already discolored my set when I pushed it into it's home. The next thing I'm going to play with is the phase, as this guy has a continuously variable phase adjustment (though that will also likely require 2 people).

I'll help you out if you want. Let me know.

 

[GregBe]

Hi John,

Looks good. I think playing with the variable phase may be just the ticket for you. I was messing with it last night with my SMS, and was amazed how subtle changes moved frequencies up and down all around the crossover. Nothing earth shattering, but enough that I think you will be able to find a dial position that will really help around the crossover. The funny thing is there didn't appear to be a rhyme or reason as I went up and down with the phase dial, so unfortunately you will probably have to try many different adjustments. The good news, is you don't need to plot the entire graph. You could just plot from say 60-100 or so.

Greg