Hi,

I want to make a speaker selector box so I can alternate between having
the music in the lounge (2 speakers) or dining room (2 speakers) or
both.

The lounge speakers are both 6ohm, whereas the dining room speakers are
4 ohm each.

How hard would something like this be to achieve? I have often read
about impedance matching - is this hard to achieve?

basically the lounge speakers impedance is fine .. the amp's
recommended and minimum is 6 ohm. So, the 2 dining room speakers
present too little a load. Ultimately, I could add two 2 ohm resistors
to each line for the dining room speakers, as dummy loads - yes?

Problem is, could there be any way I could have all four on ? If each
lounge speaker and dining room speaker were connected in parallel back
at the amp (i.e. left lounge speaker and left dining room speaker
connected to left amp output), the impedance would be too low.

How could I match the impedance of the load to 6ohm (or something
higher than that)?