[audiofreek]

ok, my wife and I watch movies in bed sometimes, using the laptop. This is usually at night when our small daughter is sleeping in the next room. To not make noise, we use headphones, but I've not been too happy running them through a splitter. Sometimes the sound fades on one phone, or only the left side audio come through, then you have to mess with the splitter connection until both of us have sound in both ears.

So, I thought of putting 2 CMOYs in a box (perhaps a higher-current A47 or something) so we could have individual volume controls... I've found a few threads here, but some are very old and all the attachments are not available anymore, so the discussion is a bit less clear.

Can you guys tell me if there is a right way to do this? Ideally fiddling with one volume pot wouldn't affect the other... Would a buffer (BUF634 or opamp?) be necessary before the pot?

I guess what I'm looking for is a distribution amp, but I can't find any schemos online to see how others do it... anyone got a link?

Thanks!

 

[Zigis]

Two CMoy is best option in your case, you can use common volume pot, however seperate volume to each listener is best. You don't need any buffer or A47.

Higher current with buffer or A47 is needed only if you use 1 amp to 2 low impedance headphones in parallel, but this is not good option.

Just build two standard CMoys and connect both inputs together.
You can use one input cap per channel, connect both amps together between input cap and pot.

 

[the_equalizer]

I'd say you do need a buffer. Check out this article on Headwize; go to the section "HEADPHONE DISTRIBUTION AMPLIFIERS"

cheers!

 

[Zigis]

Why? Two Cmoy's 10K input pots in parallel is 5K. Almost any source can drive it. Laptop's headphone out, designed for 32 ohm or lower impedance can do it more than easy.

In Headwize they talk about real distribution amps, usually 6 or more amps in parallel.

 

[the_equalizer]

Quote:

Originally Posted by Zigis /img/forum/go_quote.gif Why? Two Cmoy's 10K input pots in parallel is 5K. Almost any source can drive it. Laptop's headphone out, designed for 32 ohm or lower impedance can do it more than easy. In Headwize they talk about real distribution amps, usually 6 or more amps in parallel.

I agree. Maybe what I'm not visualizing is the correct way to hook them up. I keep thinking that turning one pot down will swamp the other amp´s input down too.

cheers!