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Message: <blockquote data-quote="adulbrich" data-source="post: 8374548" data-attributes="member: 661255">I'm about to run an M4a on 5 group 49's (400 ah total). I've got a 320 amp alternator. Going to add a 370 amp one before I get another M4a and strap so each sees .5 before rise. I'm somewhat surprised about Massive running some 8k's on four 31's and a 34. He has quite a bit of alternator though.OP, Xmax is good, but as stated, companies rate different. The more that a sub can move in a linear fashion, the better. Some companies rate it by actual mechanical clearance. You don't want to get the sub too close to mechanical limits, or bad things will happen (hit back plate or jump the gap).</blockquote>

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