Speaker Source Selection

A great way to blow up all your amplifiers! You need a speaker switch. Only one amplifier can have a physical connection at any time.

Bugger... There is no way for me to do it?

What will I do? Like use a speaker switch in reverse (with the different amps on the speaker jacks and the speakers in the input)?

Lochok

Sounds like an ideal solution.

Like use a speaker switch in reverse (with the different

Use a couple of DI boxes to run the outputs of the two smaller amps into line inputs of the big amp and run the whole show from the big amp?

DI boxes. What makes you think any of the amps have balanced inputs? Why not just feed the tape out's into line inputs? Or use the headphone outputs if you want to control volume from the first amp.

MrT.

It doesn't matter whether the inputs are balanced or not. You can still use DI boxes. The OP didn't say that the amps had tape outs either. Just that there were 3 amps and 1 set of speakers. He wanted to connect each one with a separate volume control to the 1 set of speakers. I was thinking, rather than connect all the amps to the speakers, just connect one, and provide an attenuator from the output of each amp to bring it down to line level and feed it into line inputs on the main amp (if they are available).

One does have a tape out... but it is a weird proprietory connection on a Sony system. The other I can run from a headphone and use the third's spare inputs in the way you suggested

I was considering something similar to this - how well do attenuators work?

Lachlan

And you would need to why exactly?

Well using the volume controls on each amp, and the headphone output, or a resistive divider on each speaker output would achieve the same thing at FAR less cost. So why the need for DI's in that case?

MrT.