Alpine Install problems

[tvro32]

I have just installed a new alpine amp MRP-F300 with a pair of Alpine SPR-17C 6 1/2 2 way coaxial speakers. We used the speaker level inputs form the head unit. (BMW 325i 1994). At very low volume the system works great. But when turned up (Normal levels) the amp cuts out for 10 seconds then plays for several seconds before cycling again. The power feeds for the amp are 8 ga less tha 3 feet direct to battery. If I connect a pair for 6X9 8 ohm speakers to the amp (same channel) everything works great. The alpine speakers are listed as 4 ohm. Why would they trip the protection circuit in the amp?

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[AVRevolution 10+ year member]

There any many things it could be. Process of elimination, start by disconnecting one speaker at a time and turning up the volume. Could be one speaker, or speaker lead is grounded.

 

[Gianotti 10+ year member]

x2 one bad speaker could cause a chain effect and make this happen, seen it many times.

 

[Stalin-ohaulic]

I have just installed a new alpine amp MRP-F300 with a pair of Alpine SPR-17C 6 1/2 2 way coaxial speakers. We used the speaker level inputs form the head unit. (BMW 325i 1994). At very low volume the system works great. But when turned up (Normal levels) the amp cuts out for 10 seconds then plays for several seconds before cycling again. The power feeds for the amp are 8 ga less tha 3 feet direct to battery. If I connect a pair for 6X9 8 ohm speakers to the amp (same channel) everything works great. The alpine speakers are listed as 4 ohm. Why would they trip the protection circuit in the amp?

When you say the power feeds are less than 3 ft and direct to the battery, where exactly did you mount your amp?

Pictures please.

 

[tvro32]

Amp is mounted in trunk. 325i has battery located in trunk. Also by X2 do you mean 2 way?

 

[kodak314 10+ year member]

Amp is mounted in trunk. 325i has battery located in trunk. Also by X2 do you mean 2 way?

x2/2x means he agrees with the above post

 

[th3disturbed1 10+ year member]

maybe the gain is too high? 8 ohm should see about half the power 4 ohm is getting

 

[Enellz 10+ year member]

Are your grounds sanded down to bare metal? Also do the process of elimination as stated? Do you have a DMM (Digital Multi Meter), if so check you ohm load and voltage at the amp. If not I recommend you get one from lowes or home depot for 20 since your doing self installs

 

[tvro32]

Found the problem. Had a short in the crossover on one spaeker.