PT2400 is a Pro amps the is not tuned like the TFM-75. You can her the differences. Most PT2400 were road hard and tuned with mixers to what the bands wanted. PT2400 is more of a flat sound verses TFM-75 tuned amp. A lot of of amps are tuned for their sound.
Not trying to be a BOSE fan. 901's require a concrete block home to really work correctly, because they require backward sound reflections. Just letting you know what i found out helping a friend with his setups.