Channels and Impedance
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=66087
Printed Date: September 14, 2025 at 11:15 PM
Topic: Channels and Impedance
Posted By: project
Subject: Channels and Impedance
Date Posted: November 11, 2005 at 10:19 PM
Sorry this is a pretty basic question. I'm looking for a four channel amp for my front and rear components. For an amp that is 4 channels and rated at 4 ohms, does that mean the amp needs to see a total impedance of 4 ohms? In other words, do I have to wire the front two (4 ohm) speakers in series and the rears similarly to get the 4 ohm total impedance? Thanks for your help.
Replies:
Posted By: RalphWiggum
Date Posted: November 11, 2005 at 10:42 PM
An amp rated 50x4 @ 4ohms means each of the 4 channels will produce a max output of 50w assuming each channel is presented with a 4ohm load. No special wiring required.
Posted By: project
Date Posted: November 12, 2005 at 9:42 AM
Is that also true for 2 channels amps and rms?
Posted By: arrow12
Date Posted: November 12, 2005 at 9:51 AM
If a 4 channel amp is stable at 4 ohms, then each channel needs to see a 4 ohm impedance. The same applies for a 2 channel amp. A 4 ohm stable 2 cannel amp needs to a 4 ohm impedance on each channel. If an amp is 2 ohm stable, then each channel can take a 2 ohm load. This will usually allow the amp to produce more power too.
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That's my opinion. Take it, leave it, or correct me.
Posted By: project
Date Posted: November 12, 2005 at 9:56 AM
Thanks.
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