the 1505 are an excellent amp. released in '98 and available until ~2000. VERY gutsy amp. class AB and suitable for a big front stage or bridged to run a big sub setup. some would argue these were 'stronger' than the later 1507's.
rated at:
*2x150/1x600WRMS at 12V into 4ohm...underrated
bridged, they are known to exceed 1kWRMS without trouble, and are NOT 2ohm bridged mono stable (well, not officially, although are known to drive 2ohm mono without shutting down).
new, they retailed for ~$1100. they are BIG; i'll post the dimensions when i get a chance to look them up.
given the reliability of alpine V12's, they make excellent buying at the right price. and $550 sounds fair to me, especially as i expect CRXZY looks after her gear.
it'd run an air-mille very well, no troubles at all. and offer very good SQ.
hope this helps.

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