Primare,
Congrats on your new preamp. If you are going to biamp, I will suggest you do horizontal biamping insted of bridging the amps. Bridging the amplifier, you will lose some resolution plus the amp will see half of the load, so if your speakers are 4 ohms, the amp is seeing 2 ohms, or you can sell you A21 and get a pair of JC1's.
Congrats on your new preamp. If you are going to biamp, I will suggest you do horizontal biamping insted of bridging the amps. Bridging the amplifier, you will lose some resolution plus the amp will see half of the load, so if your speakers are 4 ohms, the amp is seeing 2 ohms, or you can sell you A21 and get a pair of JC1's.