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lower ohms load on alpine mrd m1000

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=108258
Printed Date: May 15, 2024 at 2:36 PM


Topic: lower ohms load on alpine mrd m1000

Posted By: notw
Subject: lower ohms load on alpine mrd m1000
Date Posted: October 19, 2008 at 10:57 PM

I know that the "max" load for this amp is 2 ohms but I have also heard that many amps i.e. the treo ssx line can drop below their rated resistance load(with care from the user).

I am thinking about trying this with my alpine mrd-m1000 by starting with very low gain, on the hu and amp, and gradually increasing the gain while watching the temperature on the front display.

Will the hardware in the amp slowly heat up until its point of failure or will it most likely happen fast, before the temperature safety can prevent failure?

FYI: The reason I am doing this is because I bought a AQHDC315 and I figured the amp would be enough for it but I later talked to several HDC owners and they had 2200worms and higher on their HDCs so.. 1000worms must not be enough to move that stiff woofer to its capacity.
P.S. I know its wrms but i like worms. haha.

Thanks for the help/opinions,
notw



Replies:

Posted By: megaman
Date Posted: October 20, 2008 at 8:57 AM
The problem isn't only heat build-up.  It's also the fact that the amp may see a shorted load and shut off due to too low impedance.  The sub's impedance varies with frequency and at some frequencies, each coil will drop below 1 ohm.  So, most likely your amp will shut off due to a shorted load, not heat.  There a lot more factors in the amp design why it's not intended for low impedances.  Damping factor, back EMF, current draw, etc. etc.  It's like putting a super high power motor in a regular car.  Sure it will kinda work, but unless you change other things in your car, such as the drivetrain, tires, suspension, etc., you're gonna have problems.




Posted By: notw
Date Posted: October 20, 2008 at 6:00 PM
thank you

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