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My new PSA subs and my graphs - Page 3

post #61 of 599
Thread Starter 
post #62 of 599
PDX, you might add a XV15 right behind your listening position to fix that 50 Hz null. The XV15 has a FR peak at 50 Hz which is perfect for that. You might also look at the Hsu MBM-12 or the Premier Acoustic PA-150 for that role as well.
post #63 of 599
Thread Starter 
These are phase adjustments made with the cabinets placed head to head at the half way point against the front wall. Woofers facing out towards LP.


post #64 of 599
I think breaking up the symmetry is probably your best best. Otherwise something like the HSU MBM-12 may be the only way to get rid of that dip. That seems like a bit much to eq out to me.

Just out of curiosity do your mains have the same dip at 50hz when playing full range?
post #65 of 599
Thread Starter 
This is the best I've gotten the graph. I'm thinking the blue line as it's a happy medium and it looks better in the lower HZ vs. the black line.

Which one would you chose to start EQing with?

I'm thinking I can bring down the two peaks then turn the gain up on the subs. I'm only at about 1 o'clock right now.




This is the best location measurement


Edited by pdxrealtor - 7/5/13 at 12:43pm
post #66 of 599
Thread Starter 
Quote:
Originally Posted by shadyJ View Post

PDX, you might add a XV15 right behind your listening position to fix that 50 Hz null. The XV15 has a FR peak at 50 Hz which is perfect for that. You might also look at the Hsu MBM-12 or the Premier Acoustic PA-150 for that role as well.


Another sub is not in budget at this point. If I were to get another sub I would send one or two of the xv30s back and get 2 or 4 xv15s. Looks like I maybe should have done that in the first place.
Quote:
Originally Posted by Jimmy Bobarino View Post

I think breaking up the symmetry is probably your best best. Otherwise something like the HSU MBM-12 may be the only way to get rid of that dip. That seems like a bit much to eq out to me.

Just out of curiosity do your mains have the same dip at 50hz when playing full range?

I've tried one sub behind the couch one in front + a ton of other locations. I'll have to look at the couple of main measurements I ran to see about that 50 hz. I can't remember if I ran any tests with eq off in full range.
post #67 of 599
Thread Starter 
So for kicks I put the left speaker back to 0 and set the right speaker to 90. This is what I got.

Any gurus know what this says about a room? Or about anything in general?

post #68 of 599
Quote:
Originally Posted by pdxrealtor View Post

This is the best I've gotten the graph. I'm thinking the blue line as it's a happy medium and it looks better in the lower HZ vs. the black line.

Which one would you chose to start EQing with?

I'm thinking I can bring down the two peaks then turn the gain up on the subs. I'm only at about 1 o'clock right now.




This is the best location measurement

I'd start eqing with the red line in your phase adjust chart. It has the most bottom end. Then, just as you said, bring down the two peaks. Hopefully that works for you...it will really depend on how your fr behaves with the eq. In some cases, taming the peaks also brings down your dip as well. In the end, you'll have to find the phase combo that plays nicely with your eq. It could be that your best location fr is most cooperative.

In any case, I would listen with your "best location" response until then...it's much better than your phase adjusted ones!
post #69 of 599
Thread Starter 
Quote:
Originally Posted by dominguez1 View Post

I'd start eqing with the red line in your phase adjust chart. It has the most bottom end. Then, just as you said, bring down the two peaks. Hopefully that works for you...it will really depend on how your fr behaves with the eq. In some cases, taming the peaks also brings down your dip as well. In the end, you'll have to find the phase combo that plays nicely with your eq. It could be that your best location fr is most cooperative.

In any case, I would listen with your "best location" response until then...it's much better than your phase adjusted ones!

Thanks.

I assume the best location is better because of the low end?
post #70 of 599
Quote:
Originally Posted by pdxrealtor View Post

Thanks.

I assume the best location is better because of the low end?

In my mind and it's flatter. smile.gif
post #71 of 599
Quote:
Originally Posted by pdxrealtor View Post


Thanks.

I assume the best location is better because of the low end?

IMO, yes. From 30hz down, it's perty... smile.gif

post #72 of 599
Thread Starter 
Looks like left speaker phase just above or just below 45 is the ticket in this configuration. I upped the gain to 3/4 and bumped the low end without too much other affect.

Red line is my best location at 0/0 phase, just over half on the gain knobs.

post #73 of 599

Hard to believe, but I just went through the same thing (with two subs, neither of which is nearly as capable as your PSAs).

Ended up here with the phase settings:

 

 

So I left it at 180 (top light blue line) and used eq to get it flat.

A little frustrating, but (eventually) it can be done.

Good luck.

post #74 of 599
Thread Starter 
Quote:
Originally Posted by LastButNotLeast View Post

Hard to believe, but I just went through the same thing (with two subs, neither of which is nearly as capable as your PSAs).
Ended up here with the phase settings:




So I left it at 180 (top light blue line) and used eq to get it flat.
A little frustrating, but (eventually) it can be done.
Good luck.

Damn.... almost identical!

What EQ did you use?

PS - thanks for posting that
post #75 of 599
Thread Starter 
Is this giant null around 100hz going to be an issue?
post #76 of 599
That should be above your crossover point, you would need to do a sweep including the mains to see what happens to it.
post #77 of 599
Thread Starter 
Quote:
Originally Posted by Jimmy Bobarino View Post

That should be above your crossover point, you would need to do a sweep including the mains to see what happens to it.

That's what I thought too, so I upped the xo to 200 and ran just the sub sweep 15-200 and it's still there.

So I just hooked up the mains and it's still there too, but not as bad.

I think the fact that a have only a half wall behind me is a problem. I need treatments. Heading out to cut some up right now.
post #78 of 599
Quote:
Originally Posted by pdxrealtor View Post


Damn.... almost identical!

What EQ did you use?

PS - thanks for posting that

I have an HTPC, so I use the amazing Equalizer APO (http://sourceforge.net/projects/equalizerapo/).

As a consequence, I have a DSP1124P you can borrow. wink.gif

Good luck.

post #79 of 599
Thread Starter 
Might take you up on that. I was actually suggested one of those by Tom, but i wanted something simple, like knobs lol.

However depending on how this Rane PE-17 i have on the way works out i might dive into the BFF and tune that with REW.
post #80 of 599
I think room treatments may help, however If all else fails you might see if Tom will swap ya for 4 xv15's. I do not think 2 subs are going to cut it unfortunately and Heavy eq'ing is going to cost headroom.
post #81 of 599
Thread Starter 
Quote:
Originally Posted by basshead81 View Post

I think room treatments may help, however If all else fails you might see if Tom will swap ya for 4 xv15's. I do not think 2 subs are going to cut it unfortunately and Heavy eq'ing is going to cost headroom.

I do NOT want to ship back these subs, or unbox 4 more. Good Lord.....

I'm not expecting RM TRTMNTs to fix the lower HZ. We'll see just how much it does. I can hear the difference already.


Going to go cut for the front wall. Working with this insulation blows.



post #82 of 599
no biggie you can always add more if need be smile.gif
post #83 of 599
Thread Starter 
Yes , a single fv 15 would fit behind the couch perfectly. smile.gif

I would love to compare these to two Rythmiks or SVS Ultras to see if there was any huge difference. Hmmmm..... Wife- or more speakers-wife-or more speakers eek.gif

Anyways.... I got the traps in floor to ceiling and treated the entire upper front wall with 4" thick OC. What a job that was. I have just enough panels left for first reflection and rear walls. If the ceiling clouds aren't much more I'll buy them vs. make them. With my wall treatments/traps it's no biggie because I'm throwing false walls up all around, wrapped in GOM. Anyways......

Measurements. Two graphs of the best settings, before and after treatments. The 100 hz issue is much less of an issue, but as expected the lower hz didn't change. rolleyes.gif

I can sure notice a difference in the overall sound though.



Edited by pdxrealtor - 7/5/13 at 11:03pm
post #84 of 599
Man your room is showing no love.... Definately going to need another sub.
post #85 of 599
Thread Starter 
Lol. No kidding man..... Although i didn't expect much from the low hz.

Had i known i would have gotten four vs two. I think i can get this close with an EQ.

I do have one movement option left. It would be behind the seats, but not against them. I could face the subs into the listening area pushed back just into the L area under our desk that is back there.
post #86 of 599

Why don't you just use pillows and sit on the damn things?

biggrin.gif

 

I'm still itching from the insulation.

eek.gif

post #87 of 599
pdxrealtor, maybe try putting the sub(s) at the listening position and move the mic at different area just for testing purposes to see what results you get.
post #88 of 599
Thread Starter 
Quote:
Originally Posted by LastButNotLeast View Post

Why don't you just use pillows and sit on the damn things?
biggrin.gif


I'm still itching from the insulation.
eek.gif

Now.... That is not a half bad idea, and it would have saved me 2300.00 on seats. Shoot.. i could do xv 15s for seats and xv 30fs for seat backs. You're onto something. !

Did you do insulation? I got some itch spots and forget what gets rid of it. Baby powder?

I bundled up for much of it but just taking clothes off was impossible to not get any on me.

Quote:
Originally Posted by JChin View Post

pdxrealtor, maybe try putting the sub(s) at the listening position and move the mic at different area just for testing purposes to see what results you get.

I wouldn't know how to analyze the graphs to see what the heck was going on!

I was reading through this thread last night , revisiting all the graphs and posts, and still can't put my finger on what the issue is.

I think its the back half wall causing the 50hz dip, and the theater chairs causing the 100hz dip as that dip was not there before the seats showed up.

People like Bill, in this thread, who know what the heck 1/4 wave length / by sound of light going into 1/2 a wave length thats bounced off the back wall at half the speed of light then collide to cause a 3rd octave dip are the ones who could benefit from doing your suggestion.

Me... Id be spinning wheels. Might as well go hop on the exercise bike. smile.gif
post #89 of 599
Have you made a graph with only one sub on?
post #90 of 599
With my dual xv-30's i get a better response with one sub on, now i stacked them and the same happends, btw are graphs are almost the same.
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