Only the woofers cutting out of coaxials?

[seedlings]

I have some cheap VM Audio coaxials for now. Ran them for a couple of weeks from the head unit, then installed a used Jensen 40W rms (bench verified by member here) high pass filtered somewhere around 100Hz via the amp. After a couple of days, the left speaker cut out. It might be on for a minute or two, then drop out. Weird that the coax tweeter still works. They're probably a little into distortion, but not much.

I contact VM, and they ship out another set of speakers (pretty cool). In the meantime, I took out one of the rear coax (still running on head unit power), and used it to replace the intermittent one. Guess what? Same thing happened AGAIN. Tweeter works and Woofer sometimes doesn't...

Yes, they're cheap. Yes I got my money's worth. I know... But could there be another cause I am overlooking (besides just the cheapest of the speakers)?

CHAD

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[fly_marlin]

I have some cheap VM Audio coaxials for now. Ran them for a couple of weeks from the head unit, then installed a used Jensen 40W rms (bench verified by member here) high pass filtered somewhere around 100Hz via the amp. After a couple of days, the left speaker cut out. It might be on for a minute or two, then drop out. Weird that the coax tweeter still works. They're probably a little into distortion, but not much.
I contact VM, and they ship out another set of speakers (pretty cool). In the meantime, I took out one of the rear coax (still running on head unit power), and used it to replace the intermittent one. Guess what? Same thing happened AGAIN. Tweeter works and Woofer sometimes doesn't...

Yes, they're cheap. Yes I got my money's worth. I know... But could there be another cause I am overlooking (besides just the cheapest of the speakers)?

CHAD

Can you elaborate on the replacing part? A little foggy on that. You replaced what with what and how's it connected?

 

[seedlings]

Front left 6.5" coax speaker.

Tweeter keeps working, woofer cuts out.

Replaced coax speaker with the same model, taken out of a rear door.

Same day the woofer cut out again.

I just replaced a second time with the new set VM shipped me.

CHAD

 

[big scott]

why would you hook up the new set?????

find out why is blowing.

could be amp

could be h/u

could be wiring

could be.................................

start looking.

im sure that will be the last set they send you.

 

[seedlings]

why would you hook up the new set?????
find out why is blowing.

could be amp

could be h/u

could be wiring

could be.................................

start looking.

im sure that will be the last set they send you.

I ran 14 ga wiring (not factory) to each speaker. Playing test tones 60Hz, speakers disconnected, voltmeter voltage is identical front left and right channel of the Jensen amp, up to rated wattage. Connecting the speaker (one individual 4 ohm per channel), the voltages are still the same both channels. I have an old large oscilloscope that is not convenient to drag to the driveway. VM says 150W RMS (300peak) per pair, so that's 75W rms per driver. I'm giving 40W. I changed the crossover to Pioneer head unit 160Hz at -24dB/octave instead of the Jensen onboard.

Wiring is good, speaker wires not grounded or shorted. Besides getting out the oscilloscope from the pile of testgear, what else would you check?

CHAD