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Old 22nd February 2006, 03:53 AM   #1
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Join Date: Feb 2006
Location: Maine
Default Volume control for sub

Newb here, looks like a great site. Hoping someone can help an electronicly challenged person build a volume control knob for a new audio system Im putting together. I have 2 10" subs powered by a 400 watt amp. Since I rip alot of mp3's and burn to standard audio format, I get alot of mixed quality bitrates which can have various effects. I would like to control the sub volume by a makeshift box I can sauder together with some mountable rca jacks and the pot. My technical abilities are slim so I need help on where to sauder the wires.
A technical friend of mine said this: "to control the input to the 400-watt power amp, you can use a potentiometer. The value should match the input impedance of the power amp. If there are specs for it available, find it. Otherwise, something like 50Kohms should be OK. The "pot" needs to be dual-ganged for stereo and should have a logarithmic taper. This taper is standard for volume controls. Put the input across the top and bottom terminals, and the output across the center and bottom."
This is all greek to me, and I've also read on other forums that it doesnt have to be stereo, can be mono.
The amp specs: http://www.profilecaraudio.com/Manua...MSX%20Amps.pdf

I'm better at pictures than directions, if somebody can edit what I've made in paint, that would be wicked!
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Old 22nd February 2006, 09:56 PM   #2
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Join Date: Nov 2003
Location: Louisiana
There's a diagram on the bottom of the following page of my site. It shows how to build an inline level control. Only one channel is shown. You duplicate it for the second channel.
http://www.bcae1.com/potentio.htm

The last time I mentioned it, there were some comments that it wouldn't work well due to the high impedance of the pot (allowing noise to get into the system). Hundreds of these things were built (mostly for bass amps) and worked well. If there was ever an audible noise problem, the problem was in the wiring of the pot or a defective RCA cable. Of course, if you mount it right next to a transformer/power supply for neon lighting or next to a vehicle control module, you could conceivably get noise. Most were mounted in the center console to allow easy access.
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Old 23rd February 2006, 04:14 AM   #3
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Join Date: Feb 2006
Location: Maine
Ahhh, so would this drawing be correct if I used mountable rca jacks?
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