Based on your initial post, I thought you were using a 770, hence my response. We should probably take a moment to look at what speakers are being used - if they are particularly low efficiency speakers (which would be the most likely explanation for the monoblocks you have currently), then you'll need a good bit of power available to drive them, but if they are more reasonable efficiency then the easier load and the volume limits of apartment living might alleviate much of the trouble.