SB16 ultra copy

[basshunter1515]

Hello everyone.
I visited a friend a few days ago and tested his brand new 2x SB16 Ultra woofers, i was mindblown what theese small cabinets can do.
Now i want to build something that can preform as good as the svs woofers.
But im stuck already looking for a nice driver.
Cabinets have to be small but still be able play low frequency.

Right now i got a Crown XLS2505 that can do 2ohm dual 1200w or 4ohm bridged 2400w.

I have found two possible drivers, but they require INSANE ammount of power.

Peerless by Tymphany STW-350F-188PR01-04 15" High Power Subwoofer

and

HST-15 mkII 15″ Subwoofer – Stereo Integrity

 

[TBTL]

Do they have to play loud as loud as the SB16 subs? How small and low do you need?


Low bass from a small cabinet means it must have a low efficiency, so indeed you need a lot of power.

 

[basshunter1515]

well, small means under 150L volume, also, it has to go under 20hz -3dB
The SB16 is 16-460Hz (+/-3dB)

 

[WaVeInFoRm]

bigger box lower power for the same output. atleast for the lower bass tones

 

[basshunter1515]

well.... when you are limited in space, and SB16 ultra is too expensive... then what?

 

[WaVeInFoRm]

huge waste of energy. heafty driver voice coil with much power just to fit in in a smaller box. could probably tenth the power needed to create 30hz if you doubled the box.

ah, you did say copy, I may stay out of this one.

 

[mart34]

The SVS subs use Tymphany drivers built to SVS spec I believe. The Peerless (Tymphany) STW-350 is as close to the SVS SB16 driver as you can get. 150 litres would allow you to build a ported STW-350, that with 2400 Watts would out perform your friends twin SB16, just without the fancy features

 

[mart34]

Noticed you mentioned 150 litres (5.3 cubic foot) as being small, hope I'm not missing something here as this isn't small IMO. My post above, I'm basically recommending building a SVS PB16 Ultra.

 

[basshunter1515]

edit: missed that mod had to approve post.

 

[basshunter1515]

From avsforum:

I agree about a pair of UM18s as a great choice for your needs, as well as your preference for sealed. 4 cu.ft isn’t small but is also not that large. You can either go flat packs or build your own boxes with any shape, as long as it is around 4 cu.ft. You can figure your box size here:

Speaker Enclosure Volume Calculator

Your Crown amp can run two of these subs bridged into 4 ohms if wired in series. This would make for an excellent setup, and should compare favorably to dual SB16’s.

Edit: Looks like the SB16 is 3.6 cu.ft internal volume, so a UM18 in a 4 cu.ft box is very close in size. Add the increased tactile response of the 18” driver and fraction of the cost....

Got a great price of the UM18 driver, so im going to test this. Hopefully two of theese would give me the power AND output i want. I can infact build 4xUM18 and buy two Crown XLS2505 for under the cost of one SB16 Ultra
If im not happy with the UM18 im gonna try the STW-350.

 

[TBTL]

Do you have some form of parametric EQ available? The XLS2505 only supports high and low pass filters. That is not sufficient to equalize for room resonances.

 

[basshunter1515]

miniDSP 2x4HD

 

[basshunter1515]

Little update on my project;
Got two brand new Crown xls2505 amps, first enclosure almost done, bought two um18 drivers, but i only got one now. second one arrives this week. Second box is already precut, so i will build that as soon as the first one is done.

 

[basshunter1515]

Not much progress, mounted t-nut inserts, testfitted the driver, mounted backplate.

 

[mart34]

Thanks for sharing, looks great!

So you're running a XLS 2502 on each driver? That's a lot of power! Better to be over than under though.

2502 is currently in my dream subwoofer build - an approx 5cuft ported STW-350 running off a XLS 2502. Just out of interest, what power does the 2502 take from the mains? Looking in the manual, there's an image with 425W on the back of the amp. Is that what yours says?

Looking forward to seeing more pics, and any measurements. Cheers

 

[BP1Fanatic]

Nice looking subs!

 

[basshunter1515]

It says 425w on the back, yes. The STW-350 does probably need two xls2502 to reach full potencial. Im going for this driver if the daytons disapoint me.

Todays lil update: rounded all edges a tiny bit, dont know if i want to round off more yet. Sanded whole box, 50/50 water and glue to seal all open edges, used filler to cover all screwholes.

 

[basshunter1515]

Driver nr two arrived! Mostly boring pictures of filler and sanding. The box might have the final coat tomorrow.
Never used a spraygun so this will be interesting!

 

[WaVeInFoRm]

Looks well put together. Are you intending to staple/fit a thick layer of insulation around the inside of the boxes between the braces?

 

[basshunter1515]

I got polyfill.