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Old 04-10-2007
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Ohms and Amps- Wiring Question

I have a 4 channel amplifier. Currently channels 3&4 are bridged at 4ohms and running the sub. I think that's ok there.

Channels 1&2 each have one 4ohm door speaker on them. I am wanting to amplify a second set of speakers (for the rear doors). Is is possible to amplify the second set of door speakers by wiring them so that the amplifier sees 2ohms for channels 1&2? The amp is 2ohm stable in stereo mode (I think that's what it's called!)

Is this ok or not ok?
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Old 04-10-2007
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If the amp is 2 ohm stable WITH bridged rear, then it should be OK.
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Old 04-10-2007
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sounds like it should work to me. i was going to do this with my 4 channel amp as well, but the the amp was only gunna push 140 to the sub i decided not to do it.
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Old 04-10-2007
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Agreed. Sounds like it can work. Helps to have really good power hookup when you run impedances that low.
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Old 04-10-2007
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Best thing you can do is call up the manufacturer and ask them if it will work, ususally they will know alot more about the amp than anyone else.
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Old 04-14-2007
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Yes, you should be fine bringing it to a lower resistance. For the lows though, make sure you have that sub wired at 4ohms also :)
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Old 04-17-2007
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As long as your amp is 2ohm stable, you should be fine, and given that all 4 of your mids are 4ohm speakers.

I have the same setup; (4) 4ohm mids on ch 1&2 @ 2ohms and (1) 4ohm sub on ch3&4 bridged mono @ 4ohms.

Be sure to check the power handling on each of your mids too!
Most amps will nearly double the power when running at 2ohms.

If your speakers are rated at 40 watts RMS & your amp puts out 40 watts RMS @ 4 ohms and 60 watts RMS @ 2ohms, you will risk blowing your speakers.

Also, make sure you have proper size power AND ground wires as well as speaker wires to make sure the amp is at it's full potential.
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Old 04-17-2007
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Quote:
Originally Posted by rolla_guy72
Best thing you can do is call up the manufacturer and ask them if it will work, ususally they will know alot more about the amp than anyone else.
couldn't have said it better myself. thats how i figured out my audiobahn 4 channel amp could do it. i sent them an email and they let me know the next day.
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Old 04-18-2007
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Thanks for the replies guys. My amp is the Audiobahn A6004V. Supposedly, it is rated for [email protected] and [email protected]

I've got some Rockford Fosgate Power 6x8 coax I want to run in the doors. They are rated for 75w and are 4ohm speakers.

The Rockford P2 12" sub seems happy bridged off the rear channels. According to the amplifier specs, I'm giving the sub 100w more than rated, but if the specs are slightly overrated...


One Area I Need to Address--
I still need to install 4ga wire to the amp. It currently has 8ga. The built in voltage meter on the amp is all over the place when the bass hits. At idle it's ~13.8v, but when I really crank it I've noticed it'll drop to <12.5v. Dropping 1-1.5v can't be good. This concerns me.

I have some quality 4ga wire (Kicker Hyperflex) in my garage. Looks like I'll really need to get that in there once I get those front channels pushin' 2ohms each.



Thanks again for the help and comments.
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Old 04-18-2007
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A little bit lower than 12.5 isn't going to cause any damage to our audio. You gotta remember that when you listen to your system when your truck is not running, is it at about 12.5 before you even start cranking it and only goes up to 13 or 14 when the alternator is helping out. But as for dropping the ohms on the equipment, you will need more power for those.
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