Need help troubleshooting subwoofer

[T4R13]

I have been very pleased with my SD-2 8 D4 - Sundown Audio 8" 300W rms being pushed by a bridged JL hd600/4 since I installed it few years back with help from you guys here in caraudio.

Couple months ago the front right channel of my hd600/4 started intermittently cutting in and out and thought it was just a bad wiring. I rechecked all my wiring with no avail problem still persist. I just put up with it and left it as it is until I lost the sub. Sent the amp to JL audio $180 out of pocket they replaced 3 parts and came back to me after 4 weeks it was sent.

Hooked the amp back front channels works like a champ however the sub was putting out a very faint sound like a full range speakers. Removed the sub from box and tested with multimeter both voice coil connector showed at least 3.5 ohms and wired it back to 8 ohms config and plugged it back together with same result. Made sure the clips are tight on the speaker posts connections and posts measured 6.5 ohms.

I have a spare sub box and that works fine with the refurbed amp. Did my dying amp killed my sub? Is there any other way to diagnose this subwoofer before buying a new one?

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[Boomin_tahoe 5,000+ posts]

So your powering the sub at 8 ohm??

 

[T4R13]

Yes The JL HD600/4 is supposed to handle 8 ohms with its RIPS system . It worked very well for few years. Did I miss something by running it at 8 ohms?

 

[Boomin_tahoe 5,000+ posts]

Yeah....how can you hear anything @ 8 ohms?!

That sub dvc 4 ohm? If so, wire it to 1 ohm, that amp should be able to handle it, yes?

 

[T4R13]

Click here for for hd600/4 specs. unfortunately JL's rips system can't handle 1 ohm but able to put out same rms at 4 or 8 ohms. It was powering the sub fine very impressed for such small box I had it on

 

[Boomin_tahoe 5,000+ posts]

Ohhhh I see what you did there. I was thinking the other amps, higher end model.