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mp006ltk 17th December 2004 07:50 PM

Extreme extention??
Hi, I am building a pair of superspeakers and instead of trying to build a 4 way design to pick up the absolute botom end, i am going to build a matched subwoofer. It will be digitally crossed over to match the speakers and I think I am going to use a crown or crest Pro Audio amp. I don't so much need bass as I really need extention. The main speakers will have dual 8" Eton 8/800 so I just need something for the rock bottom. I am in debate on which sub to use. The options I am looking at are the peerless xls 12" with a passive radiator, the Dayton 12" in a roughly 2.5 cu. ft. box or maybe some type of car audio driver. I have looked at the Diamond TDX but they dont' really extend that well. If I'm going to be using an active crossover here does the f3 of the system really matter anymore?????? any other drivers I may have overlooked are also welcome.... Thanks!!

Real_Macgyver 17th December 2004 08:00 PM

I would go for the TC Sounds 12" driver with 3" linear travel voicecoil.

With active crossover you can compensate for almost any parameter of the driver.

BAM 17th December 2004 09:43 PM

Use a BIG driver, like the Adire Maelstrom, and tune LOW. It will be a closet-sized box, but it should match okay with a main speaker with good extension and output potential.

Paradise_Ice 18th December 2004 02:45 AM

Eleborate on the cross over range of each drive unit,

The peerless xls is a very good unit, my choice over the other two.

BAM 18th December 2004 02:58 AM

Cross over to the big sub at about 50 Hz, or below. Your mains should have plenty of output to there. Or, if you don't want to high-pass the mains, then you'll need to make sure that where you cross over is sufficiently below the cutoff of the main speakers that between the slope of the mains' rolloff and the slope of the low pass on the subwoofer, you get a flat response.

simon5 18th December 2004 08:38 AM

Just use a line array of Tumult...

mp006ltk 18th December 2004 08:53 AM

I am thinking either an xls or an xxls with the passive rasiator, and a digital crossover that has a 24 db/octave low pass and another high pass at 17hz Since the crossover is digital I can manipulate it to be a custom fit to the natural bottom end of my mains. I don't want to contaminate the signal path with an additional crossover for the main speakers. The sub, I don't mind a little creative manipulation to get things to fall into place.

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