ohms, amps?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=124212
Printed Date: April 28, 2024 at 9:49 PM

Topic: ohms, amps?

Posted By: moe18324
Subject: ohms, amps?
Date Posted: October 31, 2010 at 3:32 PM

wondering if someone could help me out with ohms, amps:

im using one 12" rockfordfosgate sub dvc 4ohm wired as so: positive wire from box into positive terminal on left side of speaker, negative wire from box into negative terminal on right side of speaker...then a wire that runs from the left negative terminal to the right positive terminal.

now the amp im using is a two channel 2 ohm stable run in mono mode

Is this a good combination? sounds pretty good but im confused with ohms and matching amps to speakers so wondering if i could be doing something better amp wise..

Replies:

Posted By: mrm1776
Date Posted: October 31, 2010 at 7:06 PM

The way you have it set up is in an 8 ohm configuration. Send us model numbers for both your sub and amp and we will tell you if they are a good match.

To set up in a 2 ohm load you'd need to connect negative to negative to negative... and positive to positive to positive

-------------
MECP Basic Installation Tech
Certification ID: CEA195600
Pioneer AVIC-X920BT
Polk Audio DXi 6500 - front
Rockford Fosgate Power T1693 - rear
Alpine MRP-F300
Alpine MRP-M500
Alpine SWR-1242D

Posted By: i am an idiot
Date Posted: October 31, 2010 at 8:04 PM

Which amp do you have? Are you SURE that it is 2ohm Mono Stable?

Posted By: zerepdivad
Date Posted: October 31, 2010 at 10:19 PM

2 channel 2 ohm mono amp? ...........

-------------
A DMM is a beautiful thing.

MECP Advanced Installer Certified.

Posted By: mrm1776
Date Posted: November 01, 2010 at 8:37 AM

Didn't say a 2 channel mono amp... he said a two channel running in mono (bridged) mode.

-------------
MECP Basic Installation Tech
Certification ID: CEA195600
Pioneer AVIC-X920BT
Polk Audio DXi 6500 - front
Rockford Fosgate Power T1693 - rear
Alpine MRP-F300
Alpine MRP-M500
Alpine SWR-1242D

Posted By: haemphyst
Date Posted: November 01, 2010 at 12:47 PM

zerepdivad wrote:

2 channel 2 ohm mono amp? ...........

A stereo amp, bridged.

If he wires the woofer as a 2-ohm load, and bridges the amplifier it would be presenting the amplifier with 1-ohm per channel; meaning the same electrical load as if it were run in stereo mode with a 1-ohm load attached to each channel.

I think I am reading his post as saying that his amplifier is 2-ohm stable, meaning the ONLY combination that he has, as a safe choice, is exactly what he has right now. The woofer, wired in series for 8-ohms will present to the amplifier the same load (again, electrically speaking) as 4-ohms per channel. Safe, if not exactly optimal.

To the OP, please post your amplifier model. I expect I have already answered your questions, but let's see all the angles, just to be safe! :)

Posted By: zerepdivad
Date Posted: November 01, 2010 at 7:05 PM

generally 2 channel amps are not 2 ohm MONO stable. they are generaly 2 ohm STEREO stable. So either he read somethign wrong or he's actually got a mono amp that simply has 2 neg and 2 pos posts on the amp for ease of wiring.

-------------
A DMM is a beautiful thing.

MECP Advanced Installer Certified.