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Old 29th January 2013, 07:18 PM   #1
gjpwiz is offline gjpwiz  United States
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Default Dual Ganged Stereo Volume Control

Hello,

I have a 2.1 speaker system with a RCA/analog Stereo input. This is connected to my TV which has a fixed audio output only, so I cannot control the volume using the TV remote. I have a RCA extension from the TV's output to the speaker input and am planning to add a volume control on this extension wire.

Browsing thru the forum I saw a suggestion to use a "100K Dual-Ganged Stereo Volume Control" 100K Dual-Ganged Stereo Volume Control - RadioShack.com However I noticed the input impedance of my speaker is 4ohms (Z623 Technical Specifications - Logitech FAQ). Will this control work with my speaker system? If not, could someone suggest an alternative? Thanks!
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Old 30th January 2013, 03:45 AM   #2
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I would venture to say that you really need an active 'amp';


TV-----> > voltage follower, volume control, voltage follower ---> > speaker system

voltage follower could be a single-ended op-amp, dual ps op-amp, or a tansistor[or fet or ...]
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Old 30th January 2013, 03:47 AM   #3
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Quote:
Originally Posted by gjpwiz View Post

I have a RCA extension from the TV's output to the speaker input and am planning to add a volume control on this extension wire.
You need a special pot for that. radio shack used to carry...........
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Old 30th January 2013, 05:09 AM   #4
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It would be good if u buy a second hand stereo with a working remote control. We can better advice from there on.

One of the simpler option is to rewire your TV audio out after the volume control, may it be any type.

Gajanan Phadte
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Old 30th January 2013, 05:09 AM   #5
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Old 30th January 2013, 05:43 AM   #6
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Active speakers with a 4Ω input impedance??

I think the Radio Shack product that KMossman mentioned is this one, catalog #42-2559. I'm pretty sure most stores still stock it. I've bought a few. Not the greatest item but it gets the job done.
If it were me I think I would just tap the remote-controlled volume with a resistor or transformer.
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Old 30th January 2013, 05:56 AM   #7
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Quote:
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Active speakers with a 4Ω input impedance??
maybe not very active?
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Old 31st January 2013, 07:00 AM   #8
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or maybe they've discovered the secret to "straight wire with gain."
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Old 31st January 2013, 09:31 AM   #9
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if some-one outside the audiophile sphere hears you are looking for an L-pad it will surely raise some eyebrows..................
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Old 1st February 2013, 11:02 PM   #10
gjpwiz is offline gjpwiz  United States
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I went ahead and connected a stereo potentiometer and it controls the volume quite well. The only issue is that there is a small hum/buzzing noise when the knob is not at the maximum position. Any inputs on how to reduce this?
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