"...
But my concern is then having an amp that’s underpowered (25 watts RMS) for my 90dB speakers..."
You need a more powerful amp, no question about it and it will perk up your system but please save the 300B if you can and use it for a second system.
You need a more powerful amp, no question about it and it will perk up your system but please save the 300B if you can and use it for a second system.