Wayne Parham Messages: 18756 Registered: January 2001
Illuminati (33rd Degree)
I think it will work too. I sometimes parallel the preamp output of a device to two inputs without any sort of buffer amp. That then parallels the input shunts of the two input devices, which are usually around 50kΩ. They aren't always 50kΩ - some are higher, some lower - but the pseudo-standard for unbalanced RCA inputs is 50kΩ.
So when I parallel two inputs, the load drops to 25kΩ. Some devices have a slight but noticeable drop in sound level when I do that. But they don't change their spectral balance, at least not in my experience, not with the gear I've been using. If a device did, then I would know it could not drive the 25kΩ load, and would need to use a buffer amp of some sort.
I think that's the biggest issue. If you can parallel the inputs and the sound doesn't change - you're golden. And since most devices have preamp outputs that could actually drive a much lower impedance than that - most could drive an impedance as low as 1kΩ - having load impedance drop from 50kΩ to 25kΩ is almost insignificant.
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