What is your definition of loud? Do you own an SPL meter so you can tell us what loud in dB's is to you? The 635 should be able to pound out plenty of Loud music, unless you plan to go deaf

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85