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I got the Alpine MRP-F240 40 x 4. Not too long ago, I was using the 45 amp alternator to power a 100w RMS amp for a 12in sub. I didn't have problems because I wired a switch into the remote turn on lead.

At peak power, will the 40x4 amp use more power than a mono 100w amp? I'm not too worried because I don't max out my amps with the wipers, lights and fan going. Common sense.

Thanks for all the help.

yea id have to agree with devin you could get some serious problems with out having enough power as for the 6100 that is also a really really decent amp for the price!

i wouldnt upgrade your system part till you had enough for the speakers and amp but i havent done anything with that amp so i dont know about it.

I'm pretty sure I'm getting the Alpine MRP-F240, 40 X 4. I won't be getting the speakers until next year. Final thoughts on the Alpine?

here are some alternators that you could do a little bit to make them fit your car [url]http://cgi.ebay.com/ebaymotors/1987-1993-BMW-5-7-Series-Rebuilt-Alternator-140-Amp_W0QQitemZ8019394728QQcategoryZ33573QQrdZ1QQcmdZViewItem[/url]

[url]http://cgi.ebay.com/ebaymotors/BMW-90A-BOSCH-ALTERNATOR-E23-E24-E28-E30_W0QQitemZ8020736487QQcategoryZ33573QQrdZ1QQcmdZViewItem[/url]

and here is a kickpanel that you make to fit your car
[img]http://www.sinisteraudio.com/sitebuilder/images/DCP_0386-329x237.jpg[/img]

[quote="sinister audio"]hmm i missed this thread yesterday and today i dont know how i did that oh well. i would deffinlyt think about some kicks or external door pods which can be pretty easy. since you have an older car im asumming that you have a flat door panel with vinyl over some light board that is thin am i correct? if so you can add door pods with out cutting and you can get 6 1/2s that are aiming correctly. since you have a 45 amp alternator your going to suffer with any type of good amp because it takes power to make power. you car is probaly using 30 of the 45 amps it has on board so you have ruffly 10 amps for a stereo which isnt much. have you tried retro fitting a gm alternator or a ford one on there? or look for a replacement? i would first worry about getting your charging system up to date, a 100 amp alternator would work pretty nicely in there. then i would probaly go with a DLS 3 channel like the A5 and run a small sub and nice comps. Might as well put german stuff in a german car right? i would just do you car piece by piece if money is tight. charging system deffinly first then id make some kicks or have some kicks made then get your equipment last.[/quote]

Your right about the door construction. I will be upgrading to a 55 amp alternator in the future. The car does not have an engine computer or anything like that, so not much of that power is being used unless I have my lights, wipers or the fan on. I'll look into Arc Audio.

EDIT: Arc is out of my price range. I found some good deals at CBR Car audio ( CBRstereo.com ) Has anyone dealt with them in the past? I can pick up a Alpine 40W x 4 for 165 shipped. They normally go for $200.

I was also considering this Pioneer amp, but forgot about it becasue an Alpine could be had for not much more.

I think its the closest thing to the gm-4000f (no longer made?)

[url]http://www.circuitcity.com/ssm/Pioneer-4-Channel-Amplifier-GM6100F-/sem/rpsm/oid/119108/rpem/ccd/productDetail.do[/url]

hmm i missed this thread yesterday and today i dont know how i did that oh well. i would deffinlyt think about some kicks or external door pods which can be pretty easy. since you have an older car im asumming that you have a flat door panel with vinyl over some light board that is thin am i correct? if so you can add door pods with out cutting and you can get 6 1/2s that are aiming correctly. since you have a 45 amp alternator your going to suffer with any type of good amp because it takes power to make power. you car is probaly using 30 of the 45 amps it has on board so you have ruffly 10 amps for a stereo which isnt much. have you tried retro fitting a gm alternator or a ford one on there? or look for a replacement? i would first worry about getting your charging system up to date, a 100 amp alternator would work pretty nicely in there. then i would probaly go with a DLS 3 channel like the A5 and run a small sub and nice comps. Might as well put german stuff in a german car right? i would just do you car piece by piece if money is tight. charging system deffinly first then id make some kicks or have some kicks made then get your equipment last.

ARC Audio above anything else listed in this thread. ARC Audio makes absolutely amazing amps, and their KAR lines are somewhat affordable, too. Stay far fucking away from Audiobahn and Profile.

X2 on the Arc Audio amp, the 400.4 is a great amp