35hz from 4 sws1100's and 2 xti 4000's enclosure design..

[subpirate]

howdy friends.

im looking for input on what sort of cabs i should build.. i have 4 selenium sws1100's they are in "cubo 18 extended" boxes right now and i have a little trouble getting them to play those low sub bass notes. im pretty good at building stuff. and am looking to build new cabs for these..

[billfitzmaurice]

Re: 35hz from 4 sws1100's and 2 xti 4000's enclosure design..

im looking for input on what sort of cabs i should build..

Just looking at the PE catalog page it says they need a 10.56 cu ft (net) vented cab for a 37Hz f3, so they're just not designed for high output at 35Hz to begin with. That's not unusual with pro-sound drivers. They trade off low frequency extension for high sensitivity. I'd start from scratch, find a reputable cab design that has the frequency response and output that you're looking for, load it with the drivers that it needs.

[Sydney]

Re: 35hz from 4 sws1100's and 2 xti 4000's enclosure design..

...selenium sws1100's they are in "cubo 18 extended" boxes right now and i have a little trouble getting them to play those low sub bass notes. ...

Examining this:

http://www.jblpro.com/ProductAttachments/18SWS1100_SpecSheet.pdf

Note the test box is 6.75 cu ft. and the resulting performance ( -10db @30Hz )
There are numerous designs for this Pro driver ( including horns ), but none of them will give extended L.F.

[subpirate]

Re: 35hz from 4 sws1100's and 2 xti 4000's enclosure design..

thanks..starting from scratch isnt an option for me. since this post ive decided i just need more of them to get the 40hz mud im looking for. today i painted and did some prewiring on this stuff im pretty sure this will suffice they're not going to play that low but i should gain a db or 2 over previous configureation and i hope these play a little more musical.

[Chris Roemer]

Re: 35hz from 4 sws1100's and 2 xti 4000's enclosure design..

You CAN generate more SPL by adding drivers, but that won't extend the bottom end. Using a "simple" box design program ( WinISD from www.linearteam.org ) - meaning NOT horn loaded, I see that driver in about a 10cf reflex box (tuned to 32Hz) should reach into the mid 30s (but excursion limited to 400-450w) w/about +2dB more output at 40Hz. In a 15cf box (Fb = 28) it can go below 30Hz, but w/even less power handling avail. (down into the 300-350w range), but w/ +2dB more output avail. at 20Hz (same outputs at 30Hz).

Near or exceeding 120dB/1m at Xmax in either case.