is L-PAD attenuator recommended for a 6 1/4 midbass?

rhythmdiy · 30th October 2008, 12:57 PM

Ive ordered a 10 inch Vifa PL26w driver for 4 ohms but It got shipped as 8 ohm driver which is making me a problem to design the crossover ... I have a 4 ohm
Midbass>
http://www.wavecor.com/html/wf160wa01.html
Tweeter>
http://www.wavecor.com/html/tw030wa02.html
Woofer>
http://www.tymphany.com/pl26wr09-08

Since i need to match the sensitivities I can get down the tweeter sensitivity to the woofer level from 94db to 87db... but how about midrange? I ve seen some threads where one doesnt advice to use a l-pad for a midrange? is it so ? then how do i match the sensitivities of these drivers ...

Another question that i have is that the woofer is said to have 6db more than the mid and tweeters since the room will absorb alot of bass... so do i need to make the sensitivity of the tweeter and the midbass to 81db? since the woofer sensitivity is 87db....

can anybody pls give me the right advice...
thanks...

sreten · 30th October 2008, 03:12 PM

Hmmm ..........

The bass driver given its response seems to be suited to a 3 way
of 82dB to 85dB midband / treble depending on BSC amount.

You can L-pad the midrange but you need to include any effects
of the increase in source impedance on the driver Qts and the c/o.
(the same is also true for tweeters)

Alternatively go active bass / mid with more power for the bass,
you could also use active BSC on the mid driver for high efficiency
in the upper midrange and treble (90dB+).

/sreten.

rhythmdiy · 30th October 2008, 06:17 PM

Is there anyother alternative?

sreten · 30th October 2008, 06:57 PM

Hi,

You can use a transformer/autotransformer but not common.

Or go with two 8 ohm 10" drivers per side, for 4 ohms and ~ 89dB.

/sreten.

rhythmdiy · 30th October 2008, 08:30 PM

at present I cant afford using two 10 inch drivers per channel to do the job but ofcourse its how I wanted in the beginning but i could go with single driver for now so i think I should be happy with L-pad atten for both mid and tweets what do u say?

Reducing 7db for the tweeter and 4.5 db for midbass would be ok? to match it to 87db woofer?

sreten · 31st October 2008, 01:49 PM

Hi,

Read up on baffle step (compensation).

http://www.rjbaudio.com/Audiofiles/FRDtools.html
http://www.geocities.com/woove99/Spk...esigningXO.htm

http://www.rjbaudio.com/projects.html

Understand RJB's 3 way designs.

And this 3.5 way :

http://www.zaphaudio.com/ZDT3.5.html

/sreten.

30th October 2008, 12:57 PM	#1
rhythmdiy diyAudio Member Join Date: Dec 2006	is L-PAD attenuator recommended for a 6 1/4 midbass? Ive ordered a 10 inch Vifa PL26w driver for 4 ohms but It got shipped as 8 ohm driver which is making me a problem to design the crossover ... I have a 4 ohm Midbass> http://www.wavecor.com/html/wf160wa01.html Tweeter> http://www.wavecor.com/html/tw030wa02.html Woofer> http://www.tymphany.com/pl26wr09-08 Since i need to match the sensitivities I can get down the tweeter sensitivity to the woofer level from 94db to 87db... but how about midrange? I ve seen some threads where one doesnt advice to use a l-pad for a midrange? is it so ? then how do i match the sensitivities of these drivers ... Another question that i have is that the woofer is said to have 6db more than the mid and tweeters since the room will absorb alot of bass... so do i need to make the sensitivity of the tweeter and the midbass to 81db? since the woofer sensitivity is 87db.... can anybody pls give me the right advice... thanks...

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30th October 2008, 03:12 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hmmm .......... The bass driver given its response seems to be suited to a 3 way of 82dB to 85dB midband / treble depending on BSC amount. You can L-pad the midrange but you need to include any effects of the increase in source impedance on the driver Qts and the c/o. (the same is also true for tweeters) Alternatively go active bass / mid with more power for the bass, you could also use active BSC on the mid driver for high efficiency in the upper midrange and treble (90dB+). /sreten.

30th October 2008, 06:17 PM	#3
rhythmdiy diyAudio Member Join Date: Dec 2006	Is there anyother alternative?

30th October 2008, 06:57 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, You can use a transformer/autotransformer but not common. Or go with two 8 ohm 10" drivers per side, for 4 ohms and ~ 89dB. /sreten.

30th October 2008, 08:30 PM	#5
rhythmdiy diyAudio Member Join Date: Dec 2006	at present I cant afford using two 10 inch drivers per channel to do the job but ofcourse its how I wanted in the beginning but i could go with single driver for now so i think I should be happy with L-pad atten for both mid and tweets what do u say? Reducing 7db for the tweeter and 4.5 db for midbass would be ok? to match it to 87db woofer?

31st October 2008, 01:49 PM	#6
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Read up on baffle step (compensation). http://www.rjbaudio.com/Audiofiles/FRDtools.html http://www.geocities.com/woove99/Spk...esigningXO.htm http://www.rjbaudio.com/projects.html Understand RJB's 3 way designs. And this 3.5 way : http://www.zaphaudio.com/ZDT3.5.html /sreten.

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