Dipole Distorsion

SillyCone · 11th October 2006, 06:23 AM

I bought two cheap 12" GAS Alpha car drivers, Qts=0.81, fs=22
vas = 4 cubicfoot, oneway xmax=9mm for testing in a U-baffle.

They are each driven by a active 12db 100 hz lp filter (TDA 7492)

The U-baffle is very rigid, made of 28mm solid beech from Ikea!

They sound very nice in the lower end, but around 50-70 hertz
they sound just horrible. Its not the magnet vent or voice coil leads, it seems to emanate from the cone.

Any Ideas?

Calvin · 11th October 2006, 08:02 AM

Hi,

Dustcap??

jauu
Calvin

SillyCone · 11th October 2006, 04:28 PM

I removed the dustcap, very easy, and glued back with silicone.

Problem gone!

Only half the dustcap perimeter was glued at factory.

Thanks!

11th October 2006, 06:23 AM	#1
SillyCone diyAudio Member Join Date: Apr 2004 Location: Malmoe, Sweden	Dipole Distorsion I bought two cheap 12" GAS Alpha car drivers, Qts=0.81, fs=22 vas = 4 cubicfoot, oneway xmax=9mm for testing in a U-baffle. They are each driven by a active 12db 100 hz lp filter (TDA 7492) The U-baffle is very rigid, made of 28mm solid beech from Ikea! They sound very nice in the lower end, but around 50-70 hertz they sound just horrible. Its not the magnet vent or voice coil leads, it seems to emanate from the cone. Any Ideas?

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11th October 2006, 08:02 AM	#2
Calvin diyAudio Member Join Date: Nov 2004 Location: close to Basel	Hi, Dustcap?? jauu Calvin

11th October 2006, 04:28 PM	#3
SillyCone diyAudio Member Join Date: Apr 2004 Location: Malmoe, Sweden	I removed the dustcap, very easy, and glued back with silicone. Problem gone! Only half the dustcap perimeter was glued at factory. Thanks!

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