Can you test for power

[JAL232 10+ year member]

They are wired: both speakers have a terminal outside box. Wired for 2 ohms...That help

Ok, the way they're wired could help us....
If you measure it and it's between 3 and 4, I'd guess your far speaker is shot. If you get an extremely high reading, I'd guess your near speaker is shot. With no reading or an incomplete circuit, then I'd guess something came loose in the wiring inside the box.

These are just guesses.

If you get a reading between 1 and 2 ohms, I'd say most likely the speakers are fine.

 

[tRidiot 10+ year member]

Oh ok.

Well, you can just check the terminals on the outside of the box, looking for an impedance of 3-4 ohms each.

They should be disconnected from everything else to be sure.

 

[JAL232 10+ year member]

Okay Ill just disconnect speaker wire, and place DMM to terminals and look for 3-4....Thank you

 

[Flipx99 5,000+ posts]

Well then certainly, yes you can test impedance at a given freq, if you're playing a test tone or sine wave. I've never done this either, but I know it's possible. They talk all the time about this stuff over on termpro. The impedance of a given sub at a given freq depends also on the enclosure (they call it 'box rise'). In other words, seldom if ever does an amp actually "see" the impedances we talk about when we say we've wired our subs to 1 ohm or .35 ohms or whatever. It's usually somewhat higher, can be DRASTICALLY higher, and changes with every frequency. It also changes with the temperature of the coil, and I believe end atmospheric pressure and humidity can have some effect on it.
I couldn't tell you how to accurately measure 'box-rise' or anything like that, though, it's definitely out of my realm of experience. Termpro would be the place to go for that kind of info, I'd think.

I always hear about box rise...and have some familiairity with what it is...but not really how to measure it.

 

[tRidiot 10+ year member]

I think it's just essentially measuring impedance at the speaker leads during burps at a certain frequency. But you just have to remember that you're measuring the impedance of not just a voice coil but an entire system, which includes voice coil, box, port, air pressure, etc. And it's constantly changing as the voice coil heats up.

The intricacies are beyond me, though.

 

[JAL232 10+ year member]

Here is somting interesting i just thought about..i think its rca's cuase my hu does not notice the sub..I cant adjust sub bass when hookep up like i used to..you think that could be it?

 

[tRidiot 10+ year member]

Headunit doesn't notice the sub? Can't adjust sub levels/x-over? I've never heard of that... every headunit I've ever seen allowed you to make adjustments whether there were RCAs connected or not.

I was leaning toward a blown low-level output on the headunit, but that shouldn't affect any kind of adjusting ability from the headunit's perspective.... oh well. Perhaps the headunit is malfuntioning...

No way to know without testing things out. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Good luck!

 

[JAL232 10+ year member]

Yeah, cause i would hit audio button on remote, and it would go to sub bass...negative 15 to positive 15...but now it it just goes to bass, which is all speaker levels. It was went to that since amp has been blown...weird kinda...i thin its hu something..its a pioneer 890

 

[JAL232 10+ year member]

Yeah, cause i would hit audio button on remote, and it would go to sub bass...negative 15 to positive 15...but now it it just goes to bass, which is all speaker levels. It was went to that since amp has been blown...weird kinda...i thin its hu something..its a pioneer 890

kenwood excelon 890....correction

 

[Shannon]

edit. never mind, got it straigtened out.