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Old 5th March 2007, 03:28 PM   #1
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Default CD player --> active speakers volume control

Hi there folks. Just came across this forum, and it looks like a great place to pick up some tips on home audio. I like to make my own music, so I've got a pair of Tannoy reveal active monitors for mixing. Last week someone gave me an old CD player (Technics 490) as I didn't have a decent one. Unfortunately, the phono output level is way too high for my active speakers, so I'm trying to build my own simple volume control. Could anyone suggest what kind of potentiometer I should look at for this task? Any help would be very gratefully received.

Cheers,
mike
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Old 5th March 2007, 03:45 PM   #2
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Hi Mike and welcome to diyAudio.

There are several options, depending on how complex you want to get. Have a search on Passive Pre(amps) for some opinions. As for a pot, personally speaking, Alps Blue Velvet is a good start, or if you just have a problem with one channel, then you could sort your problem with a couple of resistors soldered inside your connectors. Search for attenuator pad.
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Old 5th March 2007, 03:45 PM   #3
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Just try a 10k log pot and see how you get on.
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Old 5th March 2007, 06:05 PM   #4
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Terrific stuff chaps, thanks very much

I'd pretty much decided that something along the lines of a blue velvet dual channel pot would work nicely. Simple enough for me. Does the rating of the pot affect the maximum level of attenuation? I mean, is it critical that I choose, say, a 10k pot over a 50k?

It's great fun this DIY audio. Might just have to get into it..!

Thanks again.

mike
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Old 5th March 2007, 06:43 PM   #5
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Yes the pot value is quite critical. If it's too low it will load the CD player too much, if it's too high the speaker will load the pot too much and skew the response vs rotation curve.

TBH a passive volume like this is not ideal but it will work.
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Old 6th March 2007, 09:01 AM   #6
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IMO it doesn't matter that much when the response vs rotation curve is spoiled. I always set the loudness levels acoording to my ears and not to my eyes. I therefore even use a linear APLS in my "passive preamp".
Linear pots have the advantage that they have better channel similarity (don't know better words for that) than log types.

But the pot value definitely affects the upper cutoff-frequency by forming an RC lowpass together with the capacity of the cable connected to it.
My pot is a 10k type giving a worst-case cutoff-frequency of 200 kHz together with the low capacitance cable that I use.

Regards

Charles
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Old 7th March 2007, 10:14 AM   #7
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Thanks for that.

I checked the specs on my speakers and it turns out the inputs have a 37k input impedance. I 'think' therefore that a pot of either 10k or 50k would probably be ok. Does this sound about right?

Thanks again.
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