no no you dont times the numbers...
400x4 means its a 400 watt 4 channel amp
400x2 means its a 400 watt 2 channel amp
500x1 is a mono 500 watt amp

there for his system is 1300 watts not 4500

Thats provided your amp is 100% efficent at turning those "amps" into "watts".
In a real world amps don't come close to 100% so you will have to have even more power.

Bosch research
 

Ok, i finally got an answer after i went thru their website, www.boschusa.com and
punched every application i could think of and none of their high amp systems showed up. So i called them today. As usual, they are not making any for our vehicles and will probably never make them for 1st gens. They may make for fc's and fd's and heavy on the maybe. The amperage ratings they had i believe were from approx 120 thru 235amps varying on the vehicle. of course they offered the 235amp for a honda. Probably figured that after they fixed up their hondas they could not afford to live anywhere so they would have the need for a microwave, tv,
and other appliances in their car, lol. On the plus side, if you really are interesed in a high amp alternator check with your local automotive starter/alternator rebuilder and they can tell you what they can and cant do for you. rx7doctor

You know, some 2nd gens alts go in with VERY little work....

Also some GM alternators go in with minor work also. I remember reading that either here or at nopistons.

I was checking out the post and you guys are misssing out on alot of things.
Some one wrote stuff about amps in the 70s and 80s----you mean more like the 80s and the difference between then and now is back then the big powerfull amps were high current amps,now if you where to take an orion amp like a dcca it would draw so much current at 1 ohm it would kill your electrical,now if you were to buy a d class amp--that puts out 800 true rms watts it wouldnt kill it because its not a high current amp and does not take alot of power to run it,thats why amps use classes now,a,d,tube drivers and such--a real true d class amp thats 1/2 ohm stable is alot of money but if its alot of power your looking for and not alot of draw on your power--you should check those out.

Its HCCA, not DCCA. Sorry I am orion fan. Also the HCCA amp would kill your electrical system because they are extremely underrated.

like I said--they are high current amps,been around for over 20 years
hc=high current--and your right they say 50 watts--lol--my ass ---really nice amps
Shit remember the old school punch 45,or the old hifonics amps,or better yet,those damn a.d.s and linear power amps would suck any battery dry.