08-08-09: GregfiskNo, the tonal balance would remain the same.
...if I add another 2250 this would give me better tonal balance?
Or, do I get a different pair of speakers?Not necessarily. However, if you do get a different set of speakers, you should find some that have a flatter impedance curve if you intend to keep the Butler 2250.
Look, the proof is in the listening. We all can debate here for days and days. It's very easy to test my theory of improving tonal balance using an amplifier that doubles power as impedance is halved. All that is required is for you to buy one of several amplifiers (that double power as impedance is halved), that are available with 30 day home trials. Try the amp and listen for better tonal balance. If you hear improvements, then you know you're headed in the right direction. You can always return the amp for a refund and look for another amp with similar power output capabilities.
A few possibilities: Wyred 4 Sound ST Series, Ice H2O Audio S250 (or its monoblock cousin), Bel Canto Reference S500 (or its monoblock cousin), Pass Labs XA-.5 series, Portal Audio Panache.
It's really a no-lose proposition.