over heating the amp?

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blinginstang03

Member - Posts: 3

Joined: August 16, 2004

Location: United States

Posted: September 07, 2004 at 7:42 PM / IP Logged

Hi i just made a custom system and i'm running into a problem. I have 2 SVC 1000 rms subs that i have wired to about 1.6 Ohms. The amp is a class D Kenwood 1000 watt. It says it'll put out 500x1 if run at 14.4 volts, but most cars do not reach that equivelant anyways so i figure my subs are way under powered. My main problem is that the amp shuts off after about a minute or so lately. What would make it over-heat? And is it overheating? It says it can handle a 1 ohm load stable. So i have no idea what's wrong. Any help would be appreciated greatly. thankz -Jeremy

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stevdart

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Joined: January 24, 2004

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Posted: September 07, 2004 at 8:47 PM / IP Logged

The two subs, you say are single coil. What impedance are they, and are they matching? The closest I can figure to get to 1.6 is 3 ohms each, but that would be 1.5...so what are they? Just to figure the actual load on the amp.

You say it just started doing this recently. What has changed, anything at all, with your system prior to the problem starting? If no changes, did you do any rearranging of anything?

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

Ravendarat

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Joined: February 23, 2004

Location: Canada

Posted: September 07, 2004 at 11:17 PM / IP Logged

Ya I am interested as to how you are getting that load, if the subs are 4 ohm coils then you may have a sub on its way out the door and could be causeing a short that is sending the amp into protection, just a thought

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jimmeezgolfvr6

Silver - Posts: 258

Joined: March 10, 2002

Location: Canada

Posted: September 08, 2004 at 3:21 AM / IP Logged

typical amps (even class d ones) cannot run indefinitely at less than 2 ohms mono impedance. i think ravendarat has nailed this problem. also, if you're amp is heating up, that's usually a sign that the impedance is lower than it should be for that amp.

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blinginstang03

Member - Posts: 3

Joined: August 16, 2004

Location: United States

Posted: September 08, 2004 at 11:46 AM / IP Logged

The subs are 4 ohm coils. They are wired as follows. A wire for positive on each sub goes to the positive in the terminal and a negative wire goes to each sub and out to the terminal's negative. Parallel i belief. And why would the sub be on its way out the door ? Thankz -Jeremy

Ravendarat

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Joined: February 23, 2004

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Posted: September 08, 2004 at 12:41 PM / IP Logged

That should give you a 4 ohm load. Since it doesnt I would disconect the subs and meter each one seperatly to see if one tests less than 4 ohms. If it does than thats the sub that needs replacing and the one thats causing your probelms. There are a ton of reasons why a sub can go, over powering, clipping, wrong box size...........etc etc etc.

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

furflier

Copper - Posts: 236

Joined: June 14, 2004

Location: United States

Posted: September 08, 2004 at 5:16 PM / IP Logged

Ravendarat wrote:

That should give you a 4 ohm load.

You mean a 2ohm load.

Ravendarat

Platinum - Posts: 2,806

Joined: February 23, 2004

Location: Canada

Posted: September 08, 2004 at 7:16 PM / IP Logged

Ya I was typing to fast, I meant 2 ohm

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

jeffchilcott

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Joined: April 11, 2002

Location: United States

Posted: September 09, 2004 at 12:54 PM / IP Logged

you have a 2 ohm load is thier a way to bridge this amp and did you if so then you are trying to run the amp at 1 ohm

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russ lund

Copper - Posts: 188

Joined: April 07, 2004

Location: United States

Posted: September 10, 2004 at 12:33 PM / IP Logged

Don't belive that BS about 1 ohm stable.Check the mfg.specs on the amp what the power output is at a particular impedence.Personally Kenwood,Sony,Jensen etc fudge their ratings with the one ohm stable.If your sub is ok buy a better grade of amp(HiFonics,Rockford,Xtant etc.) and you will have years or enjoyment.

BigDog

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