What can my stock 90 amp alternator power?

I mean really you could get any wattage subwoofers or amps. But it takes power to make power.

I wouldn't personally recommend over 1200 watts rms with the big 3 and a decent front battery.
 
I had a 99 Honda CRV that had a 90 amp alt. I removed air box and put an air intake in place for room to add an Orileys AGM 34/78 battery there under the hood, added another in the rear, Did the Big 3 in 2ga OFC and supply and ground. MMats HC300D @1750 rms @2ohms on a pair of S.Qubed HDS310s in 4.0@32htz before displacement,One Crossfire 100.2 on a pair of Infinity Kappa 60.9cs mids and CDT DRT-25 tweeters, and one Alpine 3540 Duo-B amplifier on a pair of Hertz 6.5 165 Coax in rears with a Kenwood KDC BT558 U HU with a Kicker KQ-9 EQ. Did very well. I had keep gains down to keep Roof from Rippling so much. But if you do your supply for the demand correctly, you can have a decent system and really nice results. Like Ive always said.. It takes power to make power. Sit down and plan out your system and your supply needs
 
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