amp going into protection
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=28399
Printed Date: May 16, 2024 at 1:11 PM
Topic: amp going into protection
Posted By: tee17
Subject: amp going into protection
Date Posted: March 15, 2004 at 9:17 AM
ihave 2 kenwood kfc-3005 that are 4ohm. i have a power acoustik amp(g840- 2, gothic series) that is 2ohm stable. i dont know what the rms is on the amp but the speakers are 350 watts rms, and 700 watts peak. my problem is that when i try to bridge the amp as soon as the bass hit the amp will go into protection mode. if i cut the radio down it will come back on but as soon as i turn the radio past 15 it will going into protect again. the amp plays fine if i have the amp just ran with the 2 channels but i would like to bridge it and make things a little louder. can anyone tell me what the problem might be.
Replies:
Posted By: ksin291
Date Posted: March 15, 2004 at 9:22 AM
what ohm load are you presenting to the amp, what is the configuration of your subs. dual 4, svc 4? if you are presenting an ohm load to your amp that is below what it can handle stabily it will go into protection.
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Posted By: tee17
Date Posted: March 15, 2004 at 9:27 AM
svc 4.
Posted By: ksin291
Date Posted: March 15, 2004 at 10:08 AM
If the amp is 2 ohm stable in stereo that means that is can only be bridged at 4 ohms. if you are wiring your 4 ohm svc subs in parralel then you are presenting an ohm load lower than what the amp can handle bridged. that is probably why it is going into protection.
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Posted By: tee17
Date Posted: March 15, 2004 at 11:22 AM
what if i was to run the speakers in a series, would i be able to bridge then?
Posted By: astro88
Date Posted: March 15, 2004 at 11:56 AM
You would wind up with less power out of youre amp better off leaving it on 2 channel. go get two more subs and give the amp the 2 ohm load in stereo if ya want more out of it
Posted By: tee17
Date Posted: March 15, 2004 at 1:56 PM
thanks for the help. would it work if i had three subs
Posted By: ksin291
Date Posted: March 15, 2004 at 2:00 PM
Yeah, if they are all 4 ohm svc then you could wire the first two in series and the third in parrelel which should give you a 4ohm load.
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Posted By: DYohn
Date Posted: March 15, 2004 at 2:12 PM
ksin291 wrote:
Yeah, if they are all 4 ohm svc then you could wire the first two in series and the third in parrelel which should give you a 4ohm load.
Not a good idea. Two SVC 4-ohm in series = 8-ohms. Placing a third SVC 4-ohm in parallel with this will result in a 2.66-ohm net load on the amp, which will still drive it below the minimum safe 4-ohm limit. PLUS, it is never a good idea to wire different loads in parallel (8 ohm in parallel with 4 ohm) as the lower resistance load will always get more power than the higher (in this case twice as much) and be louder. You might as well not have the 8-ohm load in the circuit at all. The only way to connect two SVC 4-ohm woofers to the listed amp is to either connect them in series for an 8-ohm load on the bridged amp, or connect them to individual channels for 4-ohm loads on each channel. The only way to connect three SVC 4-ohm loads is to wire them in series for a 12 ohm total load.
Posted By: ksin291
Date Posted: March 15, 2004 at 2:42 PM
thanks for catching that one DYohn, don't know what I was thinking. Guess I'm still sleepy....
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