amp going into protection

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tee17

Copper - Posts: 93

Joined: March 13, 2003

Location: United States

Posted: March 15, 2004 at 9:17 AM / IP Logged

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.

ksin291

Copper - Posts: 114

Joined: December 31, 2003

Location: United States

Posted: March 15, 2004 at 9:22 AM / IP Logged

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.

tee17

Copper - Posts: 93

Joined: March 13, 2003

Location: United States

Posted: March 15, 2004 at 9:27 AM / IP Logged

svc 4.

ksin291

Copper - Posts: 114

Joined: December 31, 2003

Location: United States

Posted: March 15, 2004 at 10:08 AM / IP Logged

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.

tee17

Copper - Posts: 93

Joined: March 13, 2003

Location: United States

Posted: March 15, 2004 at 11:22 AM / IP Logged

what if i was to run the speakers in a series, would i be able to bridge then?

astro88

Copper - Posts: 195

Joined: December 01, 2003

Location: Canada

Posted: March 15, 2004 at 11:56 AM / IP Logged

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

tee17

Copper - Posts: 93

Joined: March 13, 2003

Location: United States

Posted: March 15, 2004 at 1:56 PM / IP Logged

thanks for the help. would it work if i had three subs

ksin291

Copper - Posts: 114

Joined: December 31, 2003

Location: United States

Posted: March 15, 2004 at 2:00 PM / IP Logged

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.

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: March 15, 2004 at 2:12 PM / IP Logged

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.

ksin291

Copper - Posts: 114

Joined: December 31, 2003

Location: United States

Posted: March 15, 2004 at 2:42 PM / IP Logged

thanks for catching that one DYohn, don't know what I was thinking. Guess I'm still sleepy....

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amp going into protection

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