Help with a Amp

MagicalKeltic · Post by **MagicalKeltic** » Tue Jun 21, 2005 11:40 am

Ok I got 2 12' Alpine Type R 1500 watt subwoofers for my car. Now I need help on what amp to get for them. I need a amp that can power both at max. I had a friend that rcommend a Rockfordfrod Fosgate Power Series amps but I never seen those before. So can somebody please help me out here.

sinister audio · Post by **sinister audio** » Tue Jun 21, 2005 11:54 am

How much is your budget? Those subs wont last long when you do max power to them constantly? What kind of box are they going in? How good of amp do you want? i think the RMS watts is about 500 each so thats what you would want to give to them. What voice coils do they have dual 2ohm or dual 4ohm?

Jszar · Post by **Jszar** » Tue Jun 21, 2005 1:59 pm

look at an alpine amp. they should have something that will give them close to rated rms power. remember that just because they are rated at a certain power does not mean your electrical system can keep up with it. dont go buy an amp that produces 1000wrms until you are sure your alternator can power it and keep your battery charged too.

Post by **GlassWolf** » Tue Jun 21, 2005 7:41 pm

twelve foot 1500 watt subs? wow.

the alpine type R 12" subs are rated for 500 watts continuous.
you'll want to look at an amplifier like the MRD-500 or 501 for each sub, or the MRD-1000 for both, depending on the coil configuration of each sub. that's ideal power.
you don't want to bother with max or peak ratings. they're useless for the most part.
Stick to RMS or continuous for everything when choosing speakers and amplifiers.

MagicalKeltic · Post by **MagicalKeltic** » Wed Jun 22, 2005 10:29 am

The RMS is 500 watt at 4 ohms. I just found an amp but got a question. 500 watts RMS x 1 in bridged mode (at 4 ohms). Ok what does bridge do? Is it possible to wire one sub to another and get the 500 RMS on both of them or what? Rockford Fosgate Power T8002 & Rockford Fosgate Power T10001b are the amps I was looking at.

sinister audio · Post by **sinister audio** » Wed Jun 22, 2005 10:45 am

but are they the dual 4ohm model or dual 2ohm model, bridge takes 2 channels and puts them to one speaker and usually gets about double the power. those amps that your are looking at if you were to go and buy them from a dealer you better grease up before you go to buy them so it dosnt hurt you so bad. i think you probaly have the dual 4ohm and if so you can wire both of those subs to either 1 ohm or 4ohm and i would check out the alpine or something like autotek but it depends on how much you want to spend.

Post by **GlassWolf** » Thu Jun 23, 2005 11:49 am

bridged means it's a two channel amplifier. if you bridge it, you get a 1 channel amplifier, but doing so means it will only be stable down to twice the load as stereo mode, so if its 2 ohm stereo stable, it'll be 4 ohm stable when bridged due to the channel inversion and use of the negative voltage rail to achieve full power into one channel.
What this means is, if you want 500 watts @ 4 ohms from teh bridged amp, you'll need one amplifier per sub, and each sub will need to be the dual 2 ohm coil version.
coils will be wired in series for a 4 ohm load.

http://www.bcae1/com has a good section on amplifier bridging.