A factor you may want to consider in narrowing down the many possibilities that have been suggested is that I suspect the sonics of your amplifier are likely to be significantly better driving a speaker having a nominal impedance of 8 ohms (or more), compared to driving a nominally 4 ohm speaker.
The main reasons I say that are (a)the amp’s 4 ohm power rating is only 60% higher than its 8 ohm rating (240 watts vs. 150 watts), rather than the ideal which would be a doubling or close to it, and (b)its weight (which is often a useful indicator of power supply robustness) is only 31 pounds (light for a class AB two channel amplifier having such high power ratings).
Good luck. Regards,
-- Al
The main reasons I say that are (a)the amp’s 4 ohm power rating is only 60% higher than its 8 ohm rating (240 watts vs. 150 watts), rather than the ideal which would be a doubling or close to it, and (b)its weight (which is often a useful indicator of power supply robustness) is only 31 pounds (light for a class AB two channel amplifier having such high power ratings).
Good luck. Regards,
-- Al