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Texas2070 07-12-2012 08:37 AM

2 ohm sub with 4 ohm speakers?
I just bought an Alpine MRX-V70 amp and all my speakers are 4 ohm but I would really like to run a 2 ohm sub for more power. Is it alright to do this to the amp? Will it mess something up?

lee indy 07-12-2012 08:39 AM

like anything you can blow it with enough power put to it. just dont get to nuts with the amplification. does that let you set your woofer separate from your speakers.

Ibuildembig 07-12-2012 08:50 AM

The amp you bought is made to do just that. The fact your other speakers are 4 ohm doesnt matter since channel 5 is made for a 2 ohm sub.

Texas2070 07-12-2012 10:25 AM

Awesome cause the sub I was gonna get has a 300 RMS minimum and the Alpine amp only puts out 250 RMS at 4 ohm

Texas2070 07-12-2012 10:36 AM

One more question. Is it ok if the amp only pushes out 60 RMS and the speakers max is 100 RMS? Some people say that you should over power them by like 5-10 RMS. I wanna know if that will work well with my speakers.

Ibuildembig 07-12-2012 10:59 AM

should be fine

Jma20a 07-12-2012 11:42 AM

If its a well built speaker or sub it can easily handle more than the rms level. I picked up a 15" death row from incrininator audio that is rated at 1500 and im pushing it on 1750.

Texas2070 07-13-2012 08:20 AM

Ya I'm gonna change amps. I'm gonna get an Alpine PDX-V9. It pushes out 100 RMS which is the same as the speakers max. Then turn down the gain a bit so there won't be any distortion. That will work right?

Jma20a 07-15-2012 12:38 PM

do you plan on having a sub? of not that there is no need for a 5 channel amp.

eboven 07-15-2012 06:57 PM

To the OP: The speaker you wire into the amp dictates what ohm level you will be running. You cannot simply select 2 or 4 ohms, the sub is either-or. What sub are you planning on hooking up to the amp? Subs will have a "nominal impedance" rating; some are single voice coil, some are dual. Each voice coil will have it's own impedance, measured in ohms. If you have a single 4 ohm voice coil, you will run the amp at 4 ohms; there is no way to change that speaker to make the amp run 2 ohms. If your sub is a dual 4 ohm voice coil, than you can wire the two coils together in one of two ways. In a series configuration, your dual 4 ohm sub would be at a 8 ohm final load into the amp, while a parallel configuration would put your sub at a 2 ohm final load. Most car audio subs are a single 4 ohm speaker, but higher end subs will often be the dual 4 ohm speakers.

As someone else mentioned, your 5 channel amp will allow you to wire four 4-ohm speakers into the 4-channel part, and any sub configuration that does not measure below 2 ohms. You will get more power for the sub(s) at 2 ohms than at 4, but a 4 ohm sub will be slightly better sound quality; the lower the impedance, the lower the signal to noise ratio, meaning more distortion.

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