Re: Does wiring speakers in series or parallel affect the tonal character?
Go parallel. If one speaker stops working the other will still work. (though you would want to power down and hook back up with the correct ohm setting) In series if you lose one you've lost them both. That could be really bad for the amp too.
Re: Does wiring speakers in series or parallel affect the tonal character?
Raise impedance and you get bass drop-off (as if highs are more clear)
Same goes for guitar cables.
Most 4x cabs will be series and parallel. 2x cab can be either series or parallel.
If you think your cab does'nt have enough bass and it is wired in series AND if your amp allows it (Ohm selector), you could re-wire to parallel...