I've found with mine, it's the psu that makes most of the noise. The miner itself, is actually quieter, than my Avalon  841's.
Take a look at the thread below, for some sound control ideas, specifically for the M3. However, in your situation, being in
an apartment type area, ANY asic miner will be a noise problem. Goodluck!!!



Quote from Pangolinminer Thread:

https://bitcointalk.org/index.php?topic=2345436.msg32688389#msg32688389