Ya that JBL GTQ 200, and 400 I have along with those pictured are and have been very indestructable, and the most reliable amps I have ever owned to date..Old and still powerful/ clean/crisp,and pretty presentable at that. Just one of those Autotek BTS 44 will Push a pair of 600-900rms DVC 2 ohms subs, with authority 2ohms mono!! 44 watts,and one of the Alpine Dou-b 3522 will push a SVC 400 rms 10,or 12 without any issues the GTQ 200 I had on 4 -StillWater Kicker 10s.TDH is pretty low on them, and clean, and the DB rating are 100+.Ive spent 2-4k on new amps, but they just dont perform and sound like the old school amps IMO.I have gone back to my indoor closet, and pulled them back out