I had already tried those connections and found no problems on both bookshelf and floor-standing systems.
I called it a potential issue because it depends on how the input of the active crossover behaves when the crossover is off. Apparently it is well-behaved, at least at the levels you tested.
That's very nice! You can then just connect the inputs in parallel and switch off the equipment that you don't use.
That's very nice! You can then just connect the inputs in parallel and switch off the equipment that you don't use.
You will have NO problem using that combination, none at all.
As of the "OFF" amp asymmetrically loading Preamp output, it is theoretically possible IF Power amp input is straight a differential transistor BE junction, AND its emitter is tied to Audio Ground, ONLY in that case you would have a Silicon diode directly across Preamp Out.
Lots of bad decisions and poor choices for that to happen, unlikely in a Braun/ADS design, and that´s an understatement.
Not calling it "impossible", but ......
Being realistic:
1) (and most important), Differential pair input transistor Emitter will NOT be tied to Audio ground but to a high impedance point, at least a 10k ish resistor or even higher impedance Transistor collector (constant current source) so thatb duode will be in series with a high impedance, an easy load for preamp out,won´t cause clipping.
2) input transistor will most probably have a series resistor, at least 2k or higher, to help the typical (a few pF) RF fikterin capacito0r present in most designs.
3) I wouldn´t overthink it.
I would listen to main (internal) amp driving a couple speakers and switch auxiliary amp ON_OFF (while still connected in parallel with internal amp) and check for added distortion or something.
Not impossible but I would be surprised to hear any.
Unless Anxiety makes me fear there is some, that is 😉 , placebo effect is POWERFUL
Anything with ESD diodes to the supply and ground will distort like hell when the supply is at 0 V. I guess that's what happened with the record input of my CDR 775 audio CD-R(W) recorder.
A junction with 2.7 kohm in series can still cause about 1 % of distortion across a 220 ohm output impedance, and a junction with 27 kohm about 0.1 %.
In any case, this discussion is of no use anymore as the thread starter reported in post #21 that there is no problem.
A junction with 2.7 kohm in series can still cause about 1 % of distortion across a 220 ohm output impedance, and a junction with 27 kohm about 0.1 %.
In any case, this discussion is of no use anymore as the thread starter reported in post #21 that there is no problem.