| i wanna feel the bass! [message #37315] |
Mon, 15 July 2002 12:17  |
replay
Messages: 284
Registered: May 2009
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Grand Master |
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hi gang, still toying with a woofer to use with my jbl 4655's. i spoke to the cdn eminence distributor today and they recommended a kilomax 18 in a 4.7 cf sealed box. response is 3db down at 47hz. is this low enough? will this provide gut wrenching bass in a 25x10 room. i'd use a pair with the jbl's stacked on top. thanking you in advance for your input. cheers, george
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| Re: You've got mail! [message #37325 is a reply to message #37322] |
Mon, 15 July 2002 16:11  |
replay
Messages: 284
Registered: May 2009
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Grand Master |
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hi wayne, i will follow your advice and thank-you very much. after my initial post i spoke to tech support at eminence usa and he recommended a 4.78 cu ft vented box with a 4.14" square port 1" deep. he also recommended insulating the top and back of the cabinet only. he stated this box had an f3 of 37hz. why does the eminence program recommend a much smaller box? anyways i'll be building yours. cheers, geroge
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| Re: You've got mail! [message #37326 is a reply to message #37325] |
Mon, 15 July 2002 16:43 |
Adam
Messages: 419
Registered: May 2009
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Illuminati (1st Degree) |
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Wayne's box is an EBS (extended bass shelf) alignment. The response exhibits a shallow rolloff (3-6 db/octave) from a certain point, in this case 40 hz, down to the tuning frequency. The F3 is a little higher and actual frequency response isn't as flat, but if you combine this with room gain, an EBS will go usually go lower and flatter. the 4.78 cuft box will be completely flat to 37 Hz, but will rolloff quickly below that frequency. Not nearly as good for subwoofer duty. Neither box design is superior IMO, just good for different applications. If you choose the right woofer, you can get flat response to 20 Hz without even doing an EBS alignment. Adam
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| Re: how big is the box [message #37331 is a reply to message #37330] |
Mon, 15 July 2002 18:37 |
Adam
Messages: 419
Registered: May 2009
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Illuminati (1st Degree) |
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Adire Tempest
http://www.adireaudio.com/car_audio/subwoofers/tempest.htm
Shiva
http://www.adireaudio.com/car_audio/subwoofers/shiva.htm
brahmas
http://www.adireaudio.com/car_audio/subwoofers/brahma_series.htm
Some Blueprint subs
http://www.blueprintdrivers.com/ (their site is currently down)
Stryke HE 15, as well as several of the Lambda offerings
http://www.stryke.com/ (the slight shelving is caused by the low Q motor)
Ground Zero plutonium
http://www.magma-audio.de/english/gz_plutonium.htm (shelving is caused by the low Q motor)
I believe the Peerless XLS drivers will do it
http://www.d-s-t.com/main/index.htmThese are some... Some of these I have tried ported, some of these have not. The best woofers for a flat to 20 Hz box will have a super low Fs and usually a fairly high Qts. Don't let high Qts discourage you from porting, they can still sound excellent. Adam
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| Re: how big is the box [message #37333 is a reply to message #37331] |
Mon, 15 July 2002 18:57 |
bmar
Messages: 346
Registered: May 2009
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Grand Master |
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Thanks, I'll check them out. those adires are some strokers that's for sure.
distortion spec looks livable. just hate to match up a nice compression driver to 90db woofer.
something like this would be good for a different type of system for HT though.
thanks, bill
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