MRD-M1000 troubles????

[throttle out 10+ year member]

Hey yall, this is my first post here and happy to be a part of the forum!

I'm having an issue with my alpine MRD-M1000. When u start to turn up the volume everything is good till a certain point at witch the amp will start to do what I would call surge, or spike the speaker to almost it's full excursion limit. At first I thought it was clipping so I put my cap in and installed a separate ground for that amp only( was originally comming of a block). To my surprise it almost seamed worse! When it starts to spike oviously it sounds like it wants to blow the speaker and i'm forced to turn it down, but i've been able to watch the amp meter when this happens and have seen it spike to almost 85 amps and the voltage will drop to almost 10.5v only when it spikes//content.invisioncic.com/y282845/emoticons/furious.gif.fc81ca146dbff91fede3ed290dbc4f4c.gif. My setup is the MRD of course, a eclipse cd 8445 head unit, components all around, a kicker 50x2 on the fronts, and a L7 solobarac in a monster slot ported box all wirred with 0/1awgfrom batt to fused block w/ 4awgto the MRD & 8awg to the kicker all in a king cab 06 nissan frontier:crazy:. Sorry for the lenth of the post but it's a hard to explain issue. Thanks for the help. Sammy

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[tinmanchris217 10+ year member]

I started a thread a while back about the same issue. Link

My old faithful Lanzar amp would unload under certain conditions. The consensus was:

If you use a large ported box, and push your amp hard, unloading can happen. Possible suspects = amp heating up + coils heating up + issues between tuning freq/cabin resonance freq

My reasoning is that the frequency issues cause the initial instability, large efficient box doesn't have enough damping to control the instability, so it flops out of control. So you turn down the volume, and it gets control back.

For me it would start occasionally, and was very repeatable, after it began. Just a big floppy clip, loss of SPL, and not too much distortion.

 

[throttle out 10+ year member]

It's soo weird tho. I've had four different box sub combos on it, with no prevail. Also when this goes down, it seems to get softer on it's own then slowly build again, and i'm prolly runnin the amp at about half of it's capability when the issue starts to happen. just for shits today when it started doing it I turned it up hopeing it would maybee get past it and the subs got no louder than they were, while continueing to do whatever the hell it is:verymad: Thanks for the info bud, it's just got me baffled.