If you can afford to replace the P-3 with a JC-2, you will hear a greater improvement than you will get from bi-amping or using your A-21 in mono with another one. You have plenty of power already.
Also be sure the switches on your components are set properly for balanced or unbalanced, whichever you are using.
The JC-2 does not have tone controls.
Also be sure the switches on your components are set properly for balanced or unbalanced, whichever you are using.
The JC-2 does not have tone controls.