Amp Install, lacks power

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Jay T

Copper - Posts: 169

Joined: December 02, 2003

Location: Canada

Posted: May 29, 2004 at 10:42 PM / IP Logged

Just Installed an Alpine V12 MRV F307 with 2 10" JBL.

Everything works fine except that there is virtually no bass coming from the subs. I"m thinking that it needs a bigger amp and that its not strong enough. Yes everything is wired correctly. I'm using OEM speakers and a Pioneer DEH 1400. When the volume goes up... the cab speakers max out and distort and i'm not getting enough from the subs, regardless of gain settings. There is little to no control on the head unit besides a bass setting. etc.

Is it possible that the car isn't drawing enough power for the amp? its a 90 ford temp with a half ass battery. Its not really a big amp and he doesn't have any other draws of any kind.

I'm stumped

Any Thoughts????

Manoftools

Copper - Posts: 55

Joined: May 27, 2004

Location: United States

Posted: May 29, 2004 at 11:06 PM / IP Logged

On that radio you only have one set of preouts, which means that it comes set up as either the fronts or the rears, I can't remember. You have to change it to sub control and you will be get only the lows. Also that amp is pretty weak no matter what setting it is at. That is just a fact of Alpine V12's, except maybe the mrdm1000 and 500.

stevdart

Platinum - Posts: 5,816

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: May 29, 2004 at 11:15 PM / IP Logged

That amp will run smaller speakers but not enough power for subs. Bridged, it makes 80 watts X 2. So if you are using the OEM speakers off the deck, and using the Alpine 4 channel amp to power two separate subs, they are getting 80 watts each IF they each have an impedence of 2 ohms. If they each are 4 ohms, they aren't getting enough power to make much sound at all. So, how do you have the system hooked up?

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

auex

Platinum - Posts: 5,041

Joined: December 23, 2002

Location: Arizona, United States

Posted: May 29, 2004 at 11:39 PM / IP Logged

Try this, unplug one of the subs and see if it gets louder. Does your deck have rca preouts or are you using LOC?

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Ravendarat

Platinum - Posts: 2,806

Joined: February 23, 2004

Location: Canada

Posted: May 29, 2004 at 11:47 PM / IP Logged

auex is on the same line of thinking as me I think. Try reversing one of the speakers. That is try reversing the negative and positive on one of the sub woofers and see if it gets louder. Mabye one of the subs is out of phase.

double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

Jay T

Copper - Posts: 169

Joined: December 02, 2003

Location: Canada

Posted: May 30, 2004 at 12:19 AM / IP Logged

RCA's Have them bridged across the 1 & 2 , 3 & 4 4Ohms. i'll try to reverse phase and see if that helps but I don't think so. I'm going to check subs and re-wire 2 Ohms. I think the amps is just not what i need for this application.

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: May 30, 2004 at 12:27 AM / IP Logged

If they are 4 ohm subs, there is no way to make them 2 ohm. Either single or dual voice coil. Is each sub separate from the other, and each bridged to the amp? Edited- sorry, I see you answered that.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Jay T

Copper - Posts: 169

Joined: December 02, 2003

Location: Canada

Posted: May 30, 2004 at 12:30 AM / IP Logged

yes. I was just looking at that. now what is the best way to wire these things for optimal power?

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: May 30, 2004 at 12:36 AM / IP Logged

That's tough. The way you have it wired now is the only way. That amp would be nice in a multi-amp situation to run tweeters. I would get another amp for the subs. Meantime, it's easy listening music.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Jay T

Copper - Posts: 169

Joined: December 02, 2003

Location: Canada

Posted: May 30, 2004 at 12:38 AM / IP Logged

ok i'll wire the components to the 4/3/2 and i'll have to get a new amp for subs.

thanks for the help guys

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