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Old 28th April 2011, 05:14 PM   #1
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Default 3015lf for HT?

i have another 3015lf coming my way, and was going to build an ss15 to sell (cuz its fun, and i figured i could get some $ back for it) buttttttt i was thinking of replacing my 38hz tang band tapped horns with a single large subwoofer.

so could i use the 3015lf for a HT sub? i know its not a true subwoofer, thats why i am asking, will it be able to go low enough? i have a qsc rmx 1450 amp which i will be using as a sub amp. it has a selectable 30hz and 50hz limiter, but its not an active crossover where i can adjust slopes etc.

if i build the box to fit underneath my TV, i will have about 4 feet width, 3 feet depth, and height i would like to keep as short as possible because the subwoofer box would act as a "base" for the TV, raising it up by whatever height the box is. so say 12-15ft^3 to work with.....

and bridged i think the amp does around 700rms into 8 ohms? i forget...
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Old 28th April 2011, 07:10 PM   #2
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by m R g S r View Post
..so could i use the 3015lf for a HT sub?
if i build the box to fit underneath my TV, i will have about 4 feet width, 3 feet depth, and height i would like to keep as short as possible because the subwoofer box would act as a "base" for the TV, raising it up by whatever height the box is. so say 12-15ft^3 to work with...
Hi,

This design might fit if folded:

b
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Old 28th April 2011, 09:13 PM   #3
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awesome~ how would i go about creating a fold for that? i have seen the various folds people have done for the ss15 and the corresponding sims, but i'm not sure which order they do them in. do they just come up with a folding tecnhique then enter all the "s1,2,3" etc dims into hornresp? or is it the other way around?
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Old 28th April 2011, 09:36 PM   #4
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by m R g S r View Post
awesome~ how would i go about creating a fold for that? i have seen the various folds people have done for the ss15 and the corresponding sims, but i'm not sure which order they do them in. do they just come up with a folding tecnhique then enter all the "s1,2,3" etc dims into hornresp? or is it the other way around?
Few notes to consider:
1.) Bjorno's prediction seem to be using the old version data of the 3015lf
2.) Since you only have access to 30Hz or 50Hz hi-pass filters, going 20Hz for designing is a waste of efficiency.
3.) In my opinion TH's or
TQWT need delay compensation for the tops.
4.) Using the 3015lf below 30Hz has a very bad volume/performance/efficiency/costs ratio.


Last edited by Djim; 28th April 2011 at 09:39 PM.
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Old 28th April 2011, 10:43 PM   #5
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hmmm okay...i figured i'd do it because i have the spare driver coming. i guess i could just build another ss15 and sell it or just sell the driver itself for what i paid. i got it from b&h for 214 after tax/shipping etc. so if someone wants it for 214 shipped i'll sell it or i'll just build a new ss15
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Old 28th April 2011, 11:05 PM   #6
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by m R g S r View Post
hmmm okay...i figured i'd do it because i have the spare driver coming. i guess i could just build another ss15 and sell it or just sell the driver itself for what i paid. i got it from b&h for 214 after tax/shipping etc. so if someone wants it for 214 shipped i'll sell it or i'll just build a new ss15
Or ask Bjorno to redesign his suggestion for 30Hz with the data from the new version of the 3015lf and don't use delay compensation or put your driver in a oversized basreflex cab tuned to 30Hz.... choices enough
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Old 29th April 2011, 01:25 AM   #7
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A BR is fine I'll use 3/4 or 1" mdf and some bracing throughout. Can someone model the new 3015lf in a BR tuned to 30hz? Thanks!
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Old 29th April 2011, 02:00 AM   #8
Djim is offline Djim  Netherlands
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Remember using a driver in a oversized basreflex cab with a lower system resonance as the Fs of the loudspeaker is not optimal and limits its power handling. With MDF it's going to be a heavy big beast
But you can try this:

Basreflex volume (including driver and port) = 300litre (10.59 cubic foot)
Port (square for easy building) = 19,05cm x 19,05cm (7.5inch x 7.5inch)
Port Length = 28,41cm (11.19inch)

If you want to use round port(s) and/or flanged end(s) just let me know. Use 2 inch acoustic damping material on the walls. If you want to go more fancy you can find a lot of subjects in DIY about it. You can use (or buy since they come very cheap) an old graphic HiFi eq to use for making up the response if you like. With that amp you will get approx. 113dB@30Hz out of it in 2pi (this is minus pwr compression) but use your ears and eyes to hear/see if the driver feels happy with that kind of power.

Last edited by Djim; 29th April 2011 at 02:19 AM.
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Old 29th April 2011, 02:46 AM   #9
Djim is offline Djim  Netherlands
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Instead of EQ you can also use a (expensive) 12 to15mH inductor for flattening its 30-120Hz response (it can have a positive effect on its impulse behaviour).

Last edited by Djim; 29th April 2011 at 02:49 AM.
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Old 29th April 2011, 04:11 AM   #10
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This sounds tempting I think I'm gunna do it!
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