1 ohm amp heating up more into 4 ohms

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i am an idiot

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Posted: November 17, 2009 at 7:48 PM / IP Logged

Has anyone ever seen a 1 Ohm stable amp run hotter when trying to drive a 4 ohm load versus a 1 ohm load?

If so, please list make and model of the amplifier.

Velocity Motors

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Joined: March 08, 2002

Location: Manitoba, Canada

Posted: November 17, 2009 at 7:56 PM / IP Logged

Have you ? Seems to go against physics if there was one out on the market.

Jeff

Velocity Custom Home Theater

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Morden, Manitoba CANADA

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i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: November 17, 2009 at 8:06 PM / IP Logged

I have not seen one. I have seen many class D amplifiers that pull more current with no signal versus signal. (No speaker connected) Today I had a Rockford T3000.1BD that pulled about 5 amps of current at idle. With signal applied, the current draw was cut in half.

But the more heat into 4 Vs. 1 ohm, never saw it, never expect to see it.

Thanks for voting.

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: November 17, 2009 at 9:10 PM / IP Logged

Nope never seen an amp run hotter when driving a 4ohm load vs. a 1ohm.

I guess you could if you cranked the gain up when running the 4ohm load and had very little gain for the 1ohm load. But thats not what we are talking about here.

1 ohm amp heating up more into 4 ohms -- posted image.

lspker

Silver - Posts: 503

Joined: November 23, 2003

Location: Canada

Posted: November 17, 2009 at 9:22 PM / IP Logged

Might be possible based on the following. The amp is biased to one ohm with load resisters to keep power suppied maxed out, under light load exess power burnt off as heat. Usually done in class a amps, which we haven't seen this century.

blackcivichatch

Copper - Posts: 229

Joined: January 27, 2009

Location: Missouri, United States

Posted: November 17, 2009 at 10:39 PM / IP Logged

This prolly Dont have anything to do with this, But doesnt the Alpine PDX1000.1 mono amps put out 1000 watts rms in bot a 2 ohm and a 4 ohm load?? If so, I could maybe see it happening in this application..

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Velocity Motors

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Posted: November 18, 2009 at 8:02 AM / IP Logged

blackcivichatch wrote:

Not possible. Why buy an amp that is maxed out at 1000 watts at 4 ohms and no expansion capabilities when loaded down to a 2 ohm load ? Whenever you load an amp from a 4 ohm load to a 2 ohm load, it will automatically output more power. Power out put will be more as well as power consumption.

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

i am an idiot

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Posted: November 18, 2009 at 8:10 AM / IP Logged

The JL 500/1 also claims to make the same power anywhere from 1.5 to 4 ohms. There is nothing in the amp that changes rail voltage depending on what load it has presented to it. If the voltage does not increase into a highe impedance, how can it make more power if less current is required by the load.

DYohn

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Posted: November 18, 2009 at 8:17 AM / IP Logged

So what prompted this question?

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blackcivichatch

Copper - Posts: 229

Joined: January 27, 2009

Location: Missouri, United States

Posted: November 18, 2009 at 11:14 AM / IP Logged

From Alpine:

RMS Power Ratings

* Per channel into 4 Ohms: (@14.4V Ƈ%THD+N, 20Hz - 200Hz) 1000W x 1

* Per channel into 2 Ohms: (@14.4V Ƈ%THD+N, 20Hz - 200Hz) 1000W x 1

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