Sleeper
Well-known member
I have a plan, but I don't know if this will really work as I'm thinking it will.
here's the signal chain.
<all balanced sources (driven by a variety of buffers based on DRV134, opa2604, transformers etc.) >
<Through a stereo balanced bridged-t attenuator>
<SWITCH (for speaker selection source to either A,B, OR,C (never AND))>
<unknown power amplifier inputs-possibly servo balanced or just differential, or at some point perhaps a transformer>
I'm pretty sure I can just switch the hot+pos and leave the hot+pos floating on the amplifers that are not selected
I'm concerned that if I switch BOTH hot+pos AND cold-neg
I'll have the power amplifiers completly floating in such a way that they will hum badly.
If I were to switch BOTH hot+pos AND cold-neg I think I would have to shunt the unused speakers to ground, but so far I haven't come up with a switching diagram for this that actually will work.
Any thoughts or advice would be much appreciated.
Sleeper
here's the signal chain.
<all balanced sources (driven by a variety of buffers based on DRV134, opa2604, transformers etc.) >
<Through a stereo balanced bridged-t attenuator>
<SWITCH (for speaker selection source to either A,B, OR,C (never AND))>
<unknown power amplifier inputs-possibly servo balanced or just differential, or at some point perhaps a transformer>
I'm pretty sure I can just switch the hot+pos and leave the hot+pos floating on the amplifers that are not selected
I'm concerned that if I switch BOTH hot+pos AND cold-neg
I'll have the power amplifiers completly floating in such a way that they will hum badly.
If I were to switch BOTH hot+pos AND cold-neg I think I would have to shunt the unused speakers to ground, but so far I haven't come up with a switching diagram for this that actually will work.
Any thoughts or advice would be much appreciated.
Sleeper