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Old 25th May 2009, 03:57 AM   #1
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Location: Norlane; Geelong: Victoria: Australia
Default Rebuild of old box and driver

After much to and fro between herself and I , i was given reluctant permission to put a slightly bigger sub box in the lounge room.

Needless to say I lied about the final size and used an old box that used to have a cheap MTX woofer in it.

I had a Kicker EX154 that needed regluing and thanx to the guys at the distributors and some free glue and other stuff, I completed that a week ago.

The old box was 155 liters and after stuffing with fiberglass and microfiber it is probably equal to 180 liters net.

I had some big caps in the tool box and after calculating the box "Q" at 0.8 I used 1750uF which should give me a low pass of around 23 Hz.

My Yamaha pre-amp has parametric EQ so after setting the "Q" as wide as possible and boost at 31.5Hz and 4dB i connected everything up to a reasonable amp I played some music and watched a video.

Dark Side of the Moon/ Legend in that order.

I'm not unhappy with the result, the large box has removed the annoying hump in response that driver had in a 90 liter box and the first order pass has given the slight boost down low that was needed.

I could try more boost from the pre-amp but the drive has only 10mm of excursion and runs out at 130 watts when simulated in Jeff Bagbys "Woofer box modeller"

http://farm4.static.flickr.com/3575/...049b12.jpg?v=0

http://farm4.static.flickr.com/3585/...b7c588.jpg?v=0

http://farm3.static.flickr.com/2476/...7f0bba.jpg?v=0

http://farm4.static.flickr.com/3659/...e3e14f.jpg?v=0

http://farm4.static.flickr.com/3613/...f2f1c7.jpg?v=0

http://farm4.static.flickr.com/3320/...869367.jpg?v=0

The Cerwin Vega 124s are in a 20 liter box for comparison, the 2way towers are my cheap ones using an 205mm Tandy and a cheap tweeter,

Regards
Ted
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Old 25th May 2009, 04:00 AM   #2
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Moderators my mistake / please move to Sub-woofers when you have the time
Regards'
Ted
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