cripeowner wrote:There is no need to bridge the 2120 I believe it's 120 w per side plus I don't think the macs sound good bridged. Just use 1 side using the 4 ohm tap. Also try each side I found each side can sound different.
I think your amp needs attention. The two sides should not sound different. They should be identical. These are hifi amps and if they sounded different, it would mess with the stereo imaging something fierce. I use a MC2105 for my home studio and both sides sound exactly the same. These amps have also been used in mastering studios (I believe Joe Gastwirt used my setup for a number of the mastering of the CDs we love: Mac amp to ProAc Studio 100s). If there were any inherent differences between amp channels, they would never get used in this setting.
There's no reason a mac shouldn't sound good, bridged, as well. I can understand how yours might sound bad bridged, because if one channel is not operating properly (as evidenced by the apparent sonic difference between your channels), then the amplification will be asymmetrical, resulting in audible distortion.