fast tight small OB sub

inrank · 31st July 2006, 01:48 PM

ok, i already have a Tannoy TS8 sub, it is quite good apart from it booms slightly with some music, is it possible to make a relatively small OB sub with two 8 or 10" drivers that were powered by a power-amp (aslong as it had the same S-N ratio as my primare amp...) so that it would produce the same volume level as my main speakers (Kef XQ1's) so the sub would have to have a sensitivity of 89dB....

is this possible or too much hastle?

i dont want much sub bass, just flat and tight to around 40-45Hz to fill in below my Kefs.

richie00boy · 31st July 2006, 02:08 PM

The smaller you make the OB sub the more boost has to be applied to offset the 6dB/oct roll-off, and the more boost applied the more drivers move. I think you will be struggling with even a pair of 10s.

Maybe you just need to hear a good sealed box sub

sreten · 31st July 2006, 02:17 PM

Hi,

Booms at all positions of the LF extension control ?

Shouldn't really, as its a variable sealed box sub you'd
expect one extreme of the settings to be "overtight".

Could be a room mode problem, parametric dip EQ needed.

/sreten.

inrank · 31st July 2006, 02:19 PM

well, it doesnt boom all of the time, but when i turn it up so that you get a solid thump, it booms sometimes with music with double bass for ex.

31st July 2006, 01:48 PM	#1
inrank diyAudio Member Join Date: Oct 2005	fast tight small OB sub ok, i already have a Tannoy TS8 sub, it is quite good apart from it booms slightly with some music, is it possible to make a relatively small OB sub with two 8 or 10" drivers that were powered by a power-amp (aslong as it had the same S-N ratio as my primare amp...) so that it would produce the same volume level as my main speakers (Kef XQ1's) so the sub would have to have a sensitivity of 89dB.... is this possible or too much hastle? i dont want much sub bass, just flat and tight to around 40-45Hz to fill in below my Kefs.

31st July 2006, 02:08 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The smaller you make the OB sub the more boost has to be applied to offset the 6dB/oct roll-off, and the more boost applied the more drivers move. I think you will be struggling with even a pair of 10s. Maybe you just need to hear a good sealed box sub __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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31st July 2006, 02:17 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Booms at all positions of the LF extension control ? Shouldn't really, as its a variable sealed box sub you'd expect one extreme of the settings to be "overtight". Could be a room mode problem, parametric dip EQ needed. /sreten.

31st July 2006, 02:19 PM	#4
inrank diyAudio Member Join Date: Oct 2005	well, it doesnt boom all of the time, but when i turn it up so that you get a solid thump, it booms sometimes with music with double bass for ex.

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