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In Reply to: RE: Please help posted by Chodywalker@gmail.com on January 17, 2017 at 09:31:30
Need more info on the smartphone and cable you used.
I can't see the speakers blowing ahead of a protection circuit or fuse in the amp.
Check the amp and speakers and at least see if you can get them working again.
Then provide the info on the smartphone and cables. Also which jacks exactly did you plug into on the amp. If you say "Phono" than I assume you are just trolling?
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Follow Ups:
I plugged in a set of garbage speakers and they work. The drivers in totems are completely seized. This is a photo of cables. Not sure what trolling is.
If you tried other speakers, and they work, the phone may have been sending a high level of DC (offset), which in time melted the Totems' voice coils........
Thank you everyone. I ordered the replacement woofers. Can anyone tell me how to test the signal coming from amp before I plug speakers back into it. Maybe some meter I can buy and what I should look for. Thanks again everyone.
If you're in the US, Harbor Freight has little DVMs for about five bucks. Sometimes they give them away with the purchase of something else.
First thing to do is check and see if it reads zero with no input, and bring some kind of battery with you to make sure it actually reads. Do this in the parking lot, if it is defective they will replace it immediately.
As far as checking it, that is a little bit more tricky. With the woofer still out, find some program material with practically no bass and set the settings where you had themm when the woofer fried. The reading will fluctuate but that little minus sign at the left should be on and off about equal times. If it is always positive or always negative that means there is DC on it.
The reason to find something with no bass and actually have the gain up is because the circuitry in the phone might be like in a hearing aid, strictly single ended. They do this because of the lower component count and the speaker in the hearing aid provides for an inductive load. going into electronics the load will be resistive, but is usually capacitor blocked so at DC should be higher. you don't have the means to actually measure the input impedance of the amp though so it has to be done in a roundabout way.
With a (the) cable, two capacitors and four resistors a DC blocker can be built in minutes. anyone who works on electric guitars should be able to do it so a music store might be the idea here.
Another thing is if the amp does have a "DC" switch you can just set it to OFF, however if it ever gets inadvertently bumped into DC mode again you'll have the same problem. An ounce of prevention is better than pounds of speakers.
Would you be able to post of pic showing the jacks you plugged into.
On the moon amps, sometimes a pair of the input jacks have the letter "p" next to them.
For example you would have A1 A2 A3/P.
This last one is intended for phono (turntable). Plugging into there could create havoc.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Plugged into a1
The cable you showed was multicolored but the cable connected to CD on the amp is all blue. Two different cables?
Bill
The ones plugged in back are for my CD player. The ones in my hands were the ones my phone were plugged into into a1.
Was hoping to spot something obvious, but as one of the other posters said, doesn't look like you did anything wrong.
Unfortunately you've now got fried speakers.
Really surprised that much power got to them to do that much damage without the amp shutting down first. And it was both speakers.
Almost sounds like the cable end that goes into the smartphone shorted out. Or the jack in the smartphone itself is faulty.
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Are you sure you fried the speakers? Plug in earphones to hear if they work. Check fuse in your receiver. If you didn't turn everything off before plugging in the phone, you could have blown the fuse. Boy do I doubt you blew the speakers.
Amp is still working. Sound still coming from tweeters. Both drivers are frozen solid. Pushed one in and it made the worst crunchy sound I have ever heard. They're definitely toast.
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