I'm going to build a switching box for speaker and amp comparisons.
I could do a simple 2 directional system. In one direction it will switch one amp between 2 speakers, in the other direction it will switch 2 amps into 1 speaker.
But I have some questions.
For amp testing, is it overkill to switch between speaker and a dummy load to keep the other amp working ?
I saw an amp switching box described somewhere that commoned the -ve terminals. Is that safe for all amplifier designs?
I could do a simple 2 directional system. In one direction it will switch one amp between 2 speakers, in the other direction it will switch 2 amps into 1 speaker.
But I have some questions.
For amp testing, is it overkill to switch between speaker and a dummy load to keep the other amp working ?
I saw an amp switching box described somewhere that commoned the -ve terminals. Is that safe for all amplifier designs?
jimbo1968 said:I'm going to build a switching box for speaker and amp comparisons.
I could do a simple 2 directional system. In one direction it will switch one amp between 2 speakers, in the other direction it will switch 2 amps into 1 speaker.
But I have some questions.
For amp testing, is it overkill to switch between speaker and a dummy load to keep the other amp working ?
Yes it's overkill, there's no need to use a dummy load on a transistor amlifier, however a valve amp must not be used without a load.
I saw an amp switching box described somewhere that commoned the -ve terminals. Is that safe for all amplifier designs?
It's NOT safe for bridged amplifiers, and will damage it, so I would suggest switching both to be safe.
jimbo1968 said:just realised, I don't know how relays work.
does a changeover relay latch in either direction and you apply a burst of either +v or -V to choose which way it is switched ?
No, it's one way without power, and the other way with power. Although you can buy special latching relays.
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