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Old 21st March 2012, 04:07 PM   #1
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Default Need sub suggestions <150l, directional!

Hi!

I need 2 "subs", maximum size is 150l each, sensitivity at xo point must be 95db or better, -5db point must be lower than 35 hz. The subs should be as little room dependant as possible (horn, front and high up bassreflex or similar), maximum cost for drivers alone would be around 200$ per channel.

Long story short: buildt a >300l th with 2xpi sensitivity at 95db 70hz -5db 19hz. aka my stereo bench. placement is highly limited, i can not put it anywhere else. the placement is into corner and it seems like room interaction is insane, i can hear sound out of the sub just fine up close, when i move about and sit in listening position i get mainly 40hz. the suspects are a door very close and an air duct near the ceiling, bass is better (more even) outside the apartment...

I need directional speakers!
will post picture of setup later, but i need suggestions to new builds. if you have any good alternatives please do not hesitate to post them.
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Old 22nd March 2012, 12:00 AM   #2
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Any sub you put into that position will sound the same. Corners are the worse position for a subwoofer as they couple to all the room modes.

Directional sub-bass is done with groups of drivers and delays. Two drivers does not an array make.
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Old 22nd March 2012, 12:06 AM   #3
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If you can use more than one position multi subs will solve your mode problems. I would suggest hanging them on the wall somewhere near the 1/3 of the wall Height /Width
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Old 22nd March 2012, 07:56 PM   #4
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Hi.

The reason i want 2 directional subs instead of the one i have now is not for the same placement, i would like to replace my Beta 15's with them.

If i remove the TH and the beta's i have room for one 150l box per channel, if they are highly directional, they should just ignore most of the room modes if the horn or bass reflex ports are high up from the floor.

I've been looking at several designs, one of the most interesting so far is the Cubo 12. I would stack 2 of these per channel, and make a new top from some 8" FR or something. The problem with the Cubo 12 seems to be low end response, it is after all a compact design.
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Old 22nd March 2012, 09:50 PM   #5
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Sorry about the bump.

I guess i *could* sacrifice some more space. Although is is a painful decision.
This will up the volume to under 200L including material, but i can put it close to the wall double folded and get the exit at near ear height.

We're still talking 1 per channel and the budget is VERY intact at 65$ a piece.

Does anyone have anything that will go this low at this sensitivity and at a sane cost/size?

Edit:
I do not want to cross over lower than 80Hz.
Attached Images
File Type: png Dayton Audio PA310-8.png (63.5 KB, 332 views)

Last edited by KaffiMann; 22nd March 2012 at 09:56 PM.
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Old 22nd March 2012, 10:20 PM   #6
tb46 is offline tb46  United States
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Hi KaffiMann,

People seem to have very good results with bjorno's T-TQWT. I'll attach a quick Hornresp simulation for the PA310-8:

Regards,
Attached Images
File Type: jpg PA310_8_T_TQWT_Input.jpg (34.4 KB, 327 views)
File Type: jpg PA310_8_T_TQWT_SPL.jpg (31.4 KB, 321 views)
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Old 22nd March 2012, 10:59 PM   #7
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Thanks Oliver.

It never even crossed my mind, I've seen Bjorno post those things, but for some reason it did not even occur to me to try it.

Slower roll off, easier measurements, same ear height single fold.

Thanks again.
Attached Images
File Type: png T-TQWT - Dayton Audio PA310-8.png (53.5 KB, 310 views)

Last edited by KaffiMann; 22nd March 2012 at 11:08 PM.
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Old 22nd March 2012, 11:03 PM   #8
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Quote:
Originally Posted by tb46 View Post
Hi KaffiMann,

People seem to have very good results with bjorno's T-TQWT. I'll attach a quick Hornresp simulation for the PA310-8:

Regards,
I've got the PA310-8 (it's the driver I used in my POC TH). I wouldn't consider it for a 30 Hz design.
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Old 22nd March 2012, 11:23 PM   #9
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Thanks for the heads up Brian.

Exact same design with Eminence Kappalite 3012LF and Kappa Pro-12A.

Edit:
Not taken into account mounting of driver (Depth)

Edit3:
RCF LF12G301 looks really nice, mounting depth accounted for.
Attached Images
File Type: png T-TQWT - Eminence Kappa Pro-12A.png (53.5 KB, 56 views)
File Type: png T-TQWT - Eminence Kappalite 3012LF.png (53.3 KB, 51 views)
File Type: png T-TQWT - RCF LF12G301.png (53.9 KB, 46 views)

Last edited by KaffiMann; 22nd March 2012 at 11:44 PM.
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Old 24th March 2012, 01:44 AM   #10
dangus is offline dangus  Canada
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If you want REALLY localized bass, build a "bass shaker" aka tactile transducer and attach it to your chair.
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