Memphis Protection Light

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phikai

Member - Posts: 2

Joined: July 27, 2005

Location: United States

Posted: July 27, 2005 at 8:40 AM / IP Logged

I finished installing my subs yesterday and was more than excited to see how they sounded.

Anyways, I started the car and nothing happened. No power at all...so I moved the ground wire somewhere else and it all powered up. However, the subs did not move...absolutely nothing happened with the subs. The amp stayed out of protection mode so I went to adjust the BASS EQ (0-18db dial) thinking this might be why the subs we're not doing anything. This didn't change anything and didn't put the amp in protection mode. So I decided to up the gain...however, as soon as I turned that dial the amp went into protection mode.

I'm out of ideas so any help on this would be greatly appreciated. If you need any more information just leave a message and I'll get back to it as soon as I can. Thanks for anything you guys can do for me.

Pioneer AVIC D1

Memphis PR500.1

Memphis MC104D

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: July 27, 2005 at 10:14 AM / IP Logged

Could be: woofer impedence too low, speaker shorted out, system voltage too low, input level too high, gain too high, bad ground, defective amp, or any number or combination of other things. What amp is it? What is your speaker load impedence? What is your system voltage? What is driving the amp? How did you set your gain? Is your ground to bare metal on the vehicle's chassis?

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phikai

Member - Posts: 2

Joined: July 27, 2005

Location: United States

Posted: July 27, 2005 at 3:27 PM / IP Logged

The Ohm load is 1 for everything. The Amp is the Memphis 16-PRD500.1. The subs are wired all the positives together and all the negatvies together. The power and ground wire are both 4 gauge with a 200 amp fuse on the power wire. The ground is to bare metal. The gain is set all the way down and I also discovered that If i turn the HU volume up it also sends the amp into protection.

My thoughts are that the RCA cable has an issue behind the HU that I need to take a look at. However, I suppose its possible that the speakers are shorted...I'm gonna try them in a friends car later today to test that possibilty.

Any more help out there?

Pioneer AVIC D1

Memphis PR500.1

Memphis MC104D

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: July 28, 2005 at 8:36 AM / IP Logged

Sounds like your amp is not really 1-ohm stable, or your load is less than 1-ohm (yes, the speakers could be shorted or wires touching which is the same thing.) It's probably not an RCA-related issue but it never hurts to eliminate that.

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skoldspuppy

Silver - Posts: 342

Joined: July 11, 2004

Location: United States

Posted: July 28, 2005 at 10:50 AM / IP Logged

DYohn wrote:

That amp according to Memphis is 1 Ohm Stable,

I would test each speaker with a DMM and see what the Impedence reads and then again when you wire them up in Parallel again or try them in series to make a light impedence load like 4ohms and see if it goes into protection

--Skold

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Memphis Protection Light

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