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Old 20th May 2008, 09:21 AM   #1
gnugear is offline gnugear  United States
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Default How do you run your sub with full range drivers?

I know a lot of you guys say it's heresy but I like running a sub with my Bibs to fill out the low end. My question is for those of you that do like to use subs ... do you run your systems full range and let the sub handle to lowest octaves, or do you use the crossover in your subs?

I've got a 2a3 Bottlehed system with Lowther DX4 Bibs and an SVS sub. I'm currently letting my Bibs do everyting and then rounding out the very bottom. Does anyone prefer to cross them over at 50-60 hz?
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Old 20th May 2008, 12:48 PM   #2
gni is offline gni  United States
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Done both. . . but like to cross my mains to sub with the
electronic x-over. . .takes the stress off them. . .
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Old 20th May 2008, 02:42 PM   #3
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do you guys use a LP and HP on the full range speakers as well ??
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Old 20th May 2008, 02:54 PM   #4
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Right now I am running mine FR in the office. But in the past I have done this with excellent results:

I determine the input impedance of the power amp driving the satellites, then put a good quality cap in line calculated to give the xover freq I want. I also measure and tweak to make sure it is right. That way you get the best possible sounding 1st order x-over on the satellites. There is only one high quality passive component in the signal path. This is not absolutely necessary but does remove needless current draw and cone excursion. I then tweak the low pass xover controls on the sub until I get the best sound.
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Old 20th May 2008, 04:29 PM   #5
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>>> do you run your systems full range and let the sub handle to lowest octaves

I don't think the BIB substantially loads the woofer below tuning frequency so i do not think adding a crossover will help protect your lowthers much better. I would run them full and blend the subwoofer. I run my BIBs this way. Enjoy!

Godzilla
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Old 20th May 2008, 11:21 PM   #6
badman is offline badman  United States
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Quote:
Originally posted by Godzilla
>>> do you run your systems full range and let the sub handle to lowest octaves

I don't think the BIB substantially loads the woofer below tuning frequency so i do not think adding a crossover will help protect your lowthers much better. I would run them full and blend the subwoofer. I run my BIBs this way. Enjoy!

Godzilla

The way you wrote the above, if the cab isn't providing loading below tuning, then it should indeed be high passed so the driver doesn't flap in the breeze.
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Old 21st May 2008, 02:42 AM   #7
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A sealed box is a good choice for a FR and woofer combination - it
reduces the excursion of the FR at low frequencies and has a simple
and predictable response curve to mate with a woofer.
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Old 21st May 2008, 07:33 PM   #8
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My full-range drivers play their whole frequency range. The subwoofers are in the same box (separated acoustically) firing out the back. The front drivers are powered by one amp, and the back drivers are powered by another amp. There is no crossover, and the cabinets are sealed. Using an EQ, I love the way it sounds. I am planning a smaller version for my bedroom/computer system. Peace.
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Old 21st May 2008, 08:58 PM   #9
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I use the speaker taps on the plate amp to reduce the excursion of the Foster 10F3's. I think it's a couple 150 mfd caps in there.
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Old 21st May 2008, 08:59 PM   #10
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Default sub with fr speakers

Hi,
I use Fostex 167e in 17 liter ported box. Calculated f3 is around 60-70 hz. on the sattelites.
I dial in around 70 hz on the subs, and let the Fostexs roll off at there natural -24 db/oct. rate. Mostly arrived at this xover freq. thru trial and error. It sounds very good IMO. I also tried a Rane ac22 high pass xover section feeding my sattelite amp. Set at 150 hz. My amp is diy 45 single ended triode.
It makes a great improvement in spl and lowers distortion greatly.
I loose just a tad of the single ended magic with it.
I am in the process of building a high quality, high pass L-R active xover, to see if that helps.
mg16
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