Potentiometers

srinath · 20th March 2010, 05:15 AM

I am thinking of putting in some potentiometers in the speaker cabinets I am working on.
Now can I just put em in line with the hot of each driver. Like after the cross over and the wire goes to each driver, in one of those we can put in the pot ? Cos I ahve no idea what sensitivity the woofer has vs the 86 of the mids and the 93 of the tweeter. Definitely have to turn the tweeter down, but if the woofer is high too, it also need trimming.
Thanks in advance.
Cool.
Srinath.

cuibono · 20th March 2010, 05:57 AM

A couple of things - it would be a lot easier to give you a thumbs up/thumbs down if you drew a schematic of your crossover - exactly where the pot goes matters.

The other thing is that you better have a high wattage pot - 5W or so. It depends on the value of the resistance and the voltage you drive the speakers with...

pdul · 20th March 2010, 06:04 AM

You can`t trim the woofer hence it is all about obtaining as little resistance between the amp output and the unit

pdul · 20th March 2010, 06:05 AM

as possiple Sorry!

Inductor · 20th March 2010, 03:49 PM

Quote:

Originally Posted by srinath

Cos I ahve no idea what sensitivity the woofer has vs the 86 of the mids and the 93 of the tweeter. Definitely have to turn the tweeter down, but if the woofer is high too, it also need trimming.
Thanks in advance.
Cool.
Srinath.

Variable L-pads go on Mid and Tweeter only. Now, if you say your mid is not good, then drop the mid (and buy a new one). For more detailed information give more detailed data.

srinath · 21st March 2010, 04:03 AM

OK L pads on mid and tweeter is an idea, of course I could do potentiometers on mid and tweets only.
I am trying out this JVC TV speaker driver as a mid - Parts express # 269-484. Would rather keep it and get a less efficient tweeter, or even trim the tweeter only.
Now I am using a standard crossover board - Parts express #260-122. It has a high pass filter obviously for the tweeter, and I plan to send 10K and up to it, a band passon the mid, and 1-10K goes to that, and under 1K goes to the woofer.
Sorry I am not sure how to put a pic. And I have a sketch form parts express, which I have to scan in too.
Now what is worse, I have a 8 ohm woofer, a 4 ohm mid due to running the JVC's in parallel, and a 6 ohm ribbon tweeter.
So am I doomed to have somehting sounding garbled in this thing.
Thanks in advance.
Cool.
Srinath.

Inductor · 05:28 AM

The 4 Ohm mid is not going to be a problem for the xover if you use the right tables, is going to be a problem for your amp, if impedance gets very low in frequency. Make sure the xover is good for the ribbon tweeter also.

Passive crossovers
http://www.lenardaudio.com/education/06_x-over_2.html

20th March 2010, 05:15 AM	#1
srinath diyAudio Member Join Date: Feb 2010	Potentiometers I am thinking of putting in some potentiometers in the speaker cabinets I am working on. Now can I just put em in line with the hot of each driver. Like after the cross over and the wire goes to each driver, in one of those we can put in the pot ? Cos I ahve no idea what sensitivity the woofer has vs the 86 of the mids and the 93 of the tweeter. Definitely have to turn the tweeter down, but if the woofer is high too, it also need trimming. Thanks in advance. Cool. Srinath.

21st March 2010, 05:16 AM	#7
Inductor diyAudio Member Join Date: Feb 2006 Location: Cascais	The 4 Ohm mid is not going to be a problem for the xover if you use the right tables, is going to be a problem for your amp, if impedance gets very low in frequency. Make sure the xover is good for the ribbon tweeter also. Passive crossovers http://www.lenardaudio.com/education/06_x-over_2.html __________________ What the Hell is this crap?! It's not crap, it's muzak. Last edited by Inductor; 21st March 2010 at 05:28 AM.

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20th March 2010, 05:57 AM	#2
cuibono diyAudio Member Join Date: May 2006 Location: City of Angles	A couple of things - it would be a lot easier to give you a thumbs up/thumbs down if you drew a schematic of your crossover - exactly where the pot goes matters. The other thing is that you better have a high wattage pot - 5W or so. It depends on the value of the resistance and the voltage you drive the speakers with... __________________ double complete rainbow all the way!!

20th March 2010, 06:04 AM	#3
pdul diyAudio Member Join Date: Jan 2009	You can`t trim the woofer hence it is all about obtaining as little resistance between the amp output and the unit

20th March 2010, 06:05 AM	#4
pdul diyAudio Member Join Date: Jan 2009	as possiple Sorry!

21st March 2010, 04:03 AM	#6
srinath diyAudio Member Join Date: Feb 2010	OK L pads on mid and tweeter is an idea, of course I could do potentiometers on mid and tweets only. I am trying out this JVC TV speaker driver as a mid - Parts express # 269-484. Would rather keep it and get a less efficient tweeter, or even trim the tweeter only. Now I am using a standard crossover board - Parts express #260-122. It has a high pass filter obviously for the tweeter, and I plan to send 10K and up to it, a band passon the mid, and 1-10K goes to that, and under 1K goes to the woofer. Sorry I am not sure how to put a pic. And I have a sketch form parts express, which I have to scan in too. Now what is worse, I have a 8 ohm woofer, a 4 ohm mid due to running the JVC's in parallel, and a 6 ohm ribbon tweeter. So am I doomed to have somehting sounding garbled in this thing. Thanks in advance. Cool. Srinath.

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