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Discussion Starter #1

After measuring my PB2000 in room, placed in its only possible placement option, I discovered a bad null between 40-60 Hz of about 10 dB.  So, I pulled the PSW110 out of the attic, placed it in the only other location available in my room, and it filled the 40-60 Hz null pefectly.  However, it ONLY has output in this region.  Drops like a rock at 38Hz.  So this has me thinking about what the best option would be in a decent sub to pair with the PB2000 for room smoothing.

 

My short list would be:

 

PB1000

SB1000

SB2000

 

Size is a constraint, so the XS15 is too large.  Limited to about 15" in width.
 

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No way to do another PB2000? I'm a big fan of sticking with identical subs. However that being said, I've not messed around with different alignment subs (sealed vs. ported) or even just different sizes. Funny things occur with phase at port tuning frequencies, where with two different port tunings (PB1000 vs PB2000) you'll maybe have some phase mixing issues that are intriduced. At worst you could try with SVS's 45 day free trial and see if you get any issues. Of those, I'd maybe go sealed for a 2nd sub with a gradual rolloff down low that'll interfere less with the low port tuning of your PB2000.
 

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Mixing alignments is not recomended...it can be done but you will need to do some eqing as there will be some cancellation around the ported subs tune. If you are mainly using the PSW110 to fix a mid bass null then I do not see the PB-1000 giving you more then what the Polk sub is. Have you considered a the mid bass module from HSU?
 

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Discussion Starter #4

No, another PB2000 won't fit, and I don't want to spend that much when I don't really need more output.  My thought was that the PB1000 would match the PB2000's FR closely, so would help with smoothing across the entire FR, and would be as close to adding a 2nd PB2000 as I could get.  On the other hand, perhaps a smaller sealed sub like th SB1000 would have good output 30-80Hz for good FR smoothing, and possibly better low frequency extension.  Afraid this one might be too whimpy to match up well though.  2525 cu. ft. room.
 

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bear where will this 2nd sub be located??? If its nearfield I'd probably go with the SB2000, BUT if its farther away or up front in the room I'd go with the PB1000.
 

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Discussion Starter #6

It is going nearfield between the couch and wall, about 4-5 ft from a corner.
 

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Discussion Starter #7

Here is what the FR looks like:

 



 

Now, for the mighty PSW110.  Hope this does not cause a surge of orders and supply issues for Polk:

 



 

Combined: (SPL calibrated porperly)

 



 

I am thinking a PB1000 or even SB1000 would help smooth out 25-40 a bit better.
 

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First off do you have a better placement for the single sub? Maybe with better placement you could get a better initial response.
 

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Your individual response graphs are in 5db increments and your combined response is in 10db increments....let's see the combined in 5db increments and then we can see just how much help you need. My initial thought was "that combined graph looks pretty darn good, what are you complaining about?" until I saw that it was 10db steps.
 

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Already tired of the PSW10?

Quote:
Originally Posted by bear123  /t/1520253/sub-to-pair-with-pb2000-limited-space#post_24421619


 On the other hand, perhaps a smaller sealed sub like th SB1000 would have good output 30-80Hz for good FR smoothing, and possibly better low frequency extension.  Afraid this one might be too whimpy to match up well though.  2525 cu. ft. room.

How about SB12 for $600 ? Save you $100. Audioholics rated it as 1500 to 3000 cubic feet, and Ricci's listening test was in a 4,000 cubic foot room with the sub 4 meters away . If you are going to have it nearfield with the PB-2000 doing a lot of the heavy lifting, too, seems like it could do just fine.
 

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Discussion Starter #11

Quote:
Originally Posted by Brian Fineberg  /t/1520253/sub-to-pair-with-pb2000-limited-space#post_24422343


First off do you have a better placement for the single sub? Maybe with better placement you could get a better initial response.
Nope front corner of the room is the only placement option.  The only really bad part of the FR is 40-60, and the nearfield location of the other sub(where a PB2000 wont fit) does well in this range.  The Polk drops like a rock at 38 so not sure how this location does for other frequencies.
 

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Quote:
Originally Posted by bear123  /t/1520253/sub-to-pair-with-pb2000-limited-space#post_24421619


No, another PB2000 won't fit, and I don't want to spend that much when I don't really need more output.  My thought was that the PB1000 would match the PB2000's FR closely, so would help with smoothing across the entire FR, and would be as close to adding a 2nd PB2000 as I could get.  On the other hand, perhaps a smaller sealed sub like th SB1000 would have good output 30-80Hz for good FR smoothing, and possibly better low frequency extension.  Afraid this one might be too whimpy to match up well though.  2525 cu. ft. room.

Again have you considered the HSU mid bass module? I think that would help add mid bass slam and smooth the response without limiting headroom. Let the PB2000 handle the 16-40hz and let the HSU handle the 50-100hz. Adding a sealed sub will introduce another set of problems and adding the lesser PB-1000 will limit headroom.
 

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Discussion Starter #13

Quote:
Originally Posted by Alan P  /t/1520253/sub-to-pair-with-pb2000-limited-space#post_24423231


Your individual response graphs are in 5db increments and your combined response is in 10db increments....let's see the combined in 5db increments and then we can see just how much help you need. My initial thought was "that combined graph looks pretty darn good, what are you complaining about?" until I saw that it was 10db steps.
 

 

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Discussion Starter #14

Quote:
Originally Posted by basshead81  /t/1520253/sub-to-pair-with-pb2000-limited-space#post_24423546



Again have you considered the HSU mid bass module? I think that would help add mid bass slam and smooth the response without limiting headroom. Let the PB2000 handle the 16-40hz and let the HSU handle the 50-100hz. Adding a sealed sub will introduce another set of problems and adding the lesser PB-1000 will limit headroom.
I might have to check on that option.  thanks, price will be nice as well i think.
 

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Quote:
Originally Posted by basshead81  /t/1520253/sub-to-pair-with-pb2000-limited-space#post_24423546


Again have you considered the HSU mid bass module? I think that would help add mid bass slam and smooth the response without limiting headroom. Let the PB2000 handle the 16-40hz and let the HSU handle the 50-100hz. Adding a sealed sub will introduce another set of problems and adding the lesser PB-1000 will limit headroom.

So what will handle from 40 to 50hz? The mid bass module minimum crossover is 50hz, so that means setting the crossover right in the area where there is the drop out that he's trying solve coming from the PB-2000.
 

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Quote:
Originally Posted by cel4145  /t/1520253/sub-to-pair-with-pb2000-limited-space#post_24423772


So what will handle from 40 to 50hz? The mid bass module minimum crossover is 50hz, so that means setting the crossover right in the area where there is the drop out that he's trying solve coming from the PB-2000.

I meant let the SVS handle the 16-50hz and the HSU kick in above that. According to his graph it looks pretty good, meaning he solved his response problem. Now Bear just needs a good sub that will fit his space requirements to compliment the PB2000 without limiting headroom. I thought the HSU mid bass module would work well in this situation....the size is right, the price is right, and it will add some nice mid bass punch while helping smooth the response.
 

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Quote:
Originally Posted by basshead81  /t/1520253/sub-to-pair-with-pb2000-limited-space#post_24423845


I meant let the SVS handle the 16-50hz and the HSU kick in above that.

Oh, I know. My point was that his graph shows the apex of the dip at 48hz. So it might only solve half the problem if the HSU is already rolling off because of the crossover. I guess he could bypass the crossover, which might help.
 

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Discussion Starter #18

LOL actually have myself wondering how the XS30 would work in my room 
 

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Quote:
Originally Posted by bear123  /t/1520253/sub-to-pair-with-pb2000-limited-space#post_24425383


LOL actually have myself wondering how the XS30 would work in my room 

I definitely don't think that's going to fit behind your couch
 

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See: spending time here would get one to spend money to reach the next step even if one is happy with what he/she has and thinks his/her current sub is more than needed
. I was one of those.
 
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