Hi,
Can I use a hi-level to low-level (voltage divider) to connect from my 7B-SST speaker-output to my subwoofer RCA inputs?
Would that be any problem (damage) for the 7B-SST?
There are a few considerations.
The negative (-) speaker terminal must be at ground potential (connected to the amplifiers ground). If both terminals are actively driven, as would be the case with a bridged amplifier, then an voltage divider attenuator would short one of your outputs.
You need to know the rated power (watts) of the amplifier. This is necessary to roughly calculate the attenuation required to bring the speaker signal to a line level that the receiving device is familiar with. You can use the power output figure to assume a rough approximation of the maximum RMS voltage at the speaker terminals (e=square root of resistance times power). Then knowing the maximum line level signal for the receiving device you can calculate the voltage drop required, and the resistors to create the divider circuit (working around a limitation of the output impedance of about 600 ohms).
Also, some amplifiers are a bit funky if you don't offer some sort of load, so if you are going to use a divider without any paralleled speaker load, it might require some extra loading.
brucek
