Need help/knowledge.

[calimed]

I'll try to keep this short....

I have 2 JBL ND310II speakers. I have a Denon 2308ci and Pioneer Elite Vsx-32. Every time I turn the volume up on either receiver the receiver cuts off into protection mode.

My troubleshooting....I have tried different combinations of speakers, wires, and receivers. I have limited the problem to 1 of the JBL speakers. So I dismantled the JBL speaker hoping to find some loose wire. No luck. Then I disconnected each individual speaker (of the JBL tower) and turned up the volume again hoping it was a individual speaker problem. Still no luck. It kept cutting off on every attempt.

What is the problem? Could it be the main board in the back of the unit (crossover)? IF so, where can I get a replacement? I looked at JBL's site and there are no replacement parts available online.

Thanks everyone, I've been working on this for a week straight....

 

[bikdav]

It sounds like you may have found the problem. IF YOU CAN, take a magnifying glass to the crossover network and see if you can find anything amiss, a loose strand of wire somewhere, some foreign object causing a short. Perhaps take another thorough at the connector terminals. There could be a loose strand of wire across the connector terminals themselves that was not visible when you had the cables connected to the speaker. Investigate everything that you can think of.

 

[LAB3]

I'll try to keep this short....

I have 2 JBL ND310II speakers. I have a Denon 2308ci and Pioneer Elite Vsx-32. Every time I turn the volume up on either receiver the receiver cuts off into protection mode.

My troubleshooting....I have tried different combinations of speakers, wires, and receivers. I have limited the problem to 1 of the JBL speakers. So I dismantled the JBL speaker hoping to find some loose wire. No luck. Then I disconnected each individual speaker (of the JBL tower) and turned up the volume again hoping it was a individual speaker problem. Still no luck. It kept cutting off on every attempt.

What is the problem? Could it be the main board in the back of the unit (crossover)? IF so, where can I get a replacement? I looked at JBL's site and there are no replacement parts available online.

Thanks everyone, I've been working on this for a week straight....

Exchange the cross over network from the JBL that works and see if this makes the other speaker work OK. I used a ohmn meter on the + and - on the back of my drivers inside my Klipsch Cornwall speakers when I was replacing the network boards (Bob Crites) checking to see if they were to spec. Sounds like just one speaker is Not working and the Receiver goes to protect mode. Check the drivers with a meter before you hook up the working cross over from the other speaker.............. sounds like the cross over needs looking at. How old are these JBL's??

 

[calimed]

Exchange the cross over network from the JBL that works and see if this makes the other speaker work OK. I used a ohmn meter on the + and - on the back of my drivers inside my Klipsch Cornwall speakers when I was replacing the network boards (Bob Crites) checking to see if they were to spec. Sounds like just one speaker is Not working and the Receiver goes to protect mode. Check the drivers with a meter before you hook up the working cross over from the other speaker.............. sounds like the cross over needs looking at. How old are these JBL's??

I ordered a new crossover network from JBL a couple days ago ($40). I thought it might have been a bad driver so I disconnected each speaker and replayed the track of the movie that always sends the receiver into protect mode. No matter what speaker I disconnected it would still go into protect mode. Eventually I essentially disconnected every speaker then I ran the test again and it still went into protect mode. I came to the conclusion (not sure if its a correct one), that since the crossover network was the only thing in the "circuit" then that must be the issue.

JBL's (ND310ii) are about 8 years old. I know they might need to be retired, but if I want comparable speakers I would have to spend nearly $1000 which I can't afford since I just bought the VSX-32 receiver.

Thanks for helping out....

 

[LAB3]

I ordered a new crossover network from JBL a couple days ago ($40). I thought it might have been a bad driver so I disconnected each speaker and replayed the track of the movie that always sends the receiver into protect mode. No matter what speaker I disconnected it would still go into protect mode. Eventually I essentially disconnected every speaker then I ran the test again and it still went into protect mode. I came to the conclusion (not sure if its a correct one), that since the crossover network was the only thing in the "circuit" then that must be the issue.

JBL's (ND310ii) are about 8 years old. I know they might need to be retired, but if I want comparable speakers I would have to spend nearly $1000 which I can't afford since I just bought the VSX-32 receiver.

Thanks for helping out....

Ok. I would still check all the speakers/drivers and make sure none of them are shorted out before you hook up your new C/O. Good deal new for $40.00. Let us know how it goes.

 

[calimed]

Ok. I would still check all the speakers/drivers and make sure none of them are shorted out before you hook up your new C/O. Good deal new for $40.00. Let us know how it goes.

I so I got the new network crossover in. Before I installed it I bought an Ohm meter as recommended above. Retested all the speakers. I'm pretty sure I have a tweeter that isn't working. Forgive my lack of knowledge....but when I test the tweeter I get NO reading. This obviously makes me think it's blown. I tested the tweeter from the other speaker and I get a reading.

So I disconnected the tweeter. Basically have the speaker wires hanging free (wrapped in electrical tape). I thought this might fix my problem of the receiver going into protect mode. Unfortunately it keeps going into protect mode. Is the receiver going to go into protect mode if the wire are free also? My next option is to replace the speaker. The only other thing I could do is replace the crossover network.

Thanks for everyones help. Again, forgive me for my lack of intelligence about this stuff. Just trying to fix this thing myself and learn a thing or two.

 

[LAB3]

I so I got the new network crossover in. Before I installed it I bought an Ohm meter as recommended above. Retested all the speakers. I'm pretty sure I have a tweeter that isn't working. Forgive my lack of knowledge....but when I test the tweeter I get NO reading. This obviously makes me think it's blown. I tested the tweeter from the other speaker and I get a reading.

So I disconnected the tweeter. Basically have the speaker wires hanging free (wrapped in electrical tape). I thought this might fix my problem of the receiver going into protect mode. Unfortunately it keeps going into protect mode. Is the receiver going to go into protect mode if the wire are free also? My next option is to replace the speaker. The only other thing I could do is replace the crossover network.

Thanks for everyones help. Again, forgive me for my lack of intelligence about this stuff. Just trying to fix this thing myself and learn a thing or two.

Ummmm do you have a different pair of speakers to try on the receiver that keeps going onto protect mode?? I used my Yamaha AVR while I had a tweeter bad and the AVR worked fine as I unplugged the the tweeter from the cross over network. I am wondering if the receiver is hurt. Is it new and in warranty? Look at the owners manual and see if this model has a re-set for the processor... system re-set. If so do this and try your JBL again with the bad tweeter un hooked. This should not make the receiver go into a protect mode if the cross over network is OK.. my yamaha did not do this while I was waiting on a new tweeter to arrive. Did you log what each speaker/drivers Ohms were so you can compair the #s on both JBL. I read somewhere you can use a flashlight battery to test woofers to see if the voice coil is working/moving the cone.

 

[calimed]

Ummmm do you have a different pair of speakers to try on the receiver that keeps going onto protect mode?? I used my Yamaha AVR while I had a tweeter bad and the AVR worked fine as I unplugged the the tweeter from the cross over network. I am wondering if the receiver is hurt. Is it new and in warranty? Look at the owners manual and see if this model has a re-set for the processor... system re-set. If so do this and try your JBL again with the bad tweeter un hooked. This should not make the receiver go into a protect mode if the cross over network is OK.. my yamaha did not do this while I was waiting on a new tweeter to arrive. Did you log what each speaker/drivers Ohms were so you can compair the #s on both JBL. I read somewhere you can use a flashlight battery to test woofers to see if the voice coil is working/moving the cone.

Well I actually have tried two different receivers and they both go into protect mode with the same speaker no matter where I put it on the 5.1 setup. I have the blown tweeter completely disconnected and it still keeps going into protect mode. This is very confusing to me.....

 

[jonnythan]

So new crossover, and tweeter disconnected the receiver still kicks over?

 

[calimed]

Done...

So new crossover, and tweeter disconnected the receiver still kicks over?

No at that point I only disconnected the tweeter bc I figured since it was blown that was causing the problem. Between that time and now I have replaced the crossover network. Now the receiver DOES NOT go into protect mode. I reconnected the blown tweeter just to make sure that was the problem and everything still worked ok.

So in summary it was the crossover network that was the problem. I still have to get another tweeter but that isn't a big chuck of cash compared to two new speakers.

Thanks for everyones help! I really appreciate it... Hope this helps someone in the future...

 

[jonnythan]

What test did you perform on the tweeter, and what exactly did you observe?

Of course, the most straightforward way to test if the tweeter is working is to unplug all other speakers and disconnect the woofers from the crossover so that the only thing connected is the tweeter. Play some music and see what you hear.

 

[LAB3]

No at that point I only disconnected the tweeter bc I figured since it was blown that was causing the problem. Between that time and now I have replaced the crossover network. Now the receiver DOES NOT go into protect mode. I reconnected the blown tweeter just to make sure that was the problem and everything still worked ok.

So in summary it was the crossover network that was the problem. I still have to get another tweeter but that isn't a big chuck of cash compared to two new speakers.

Thanks for everyones help! I really appreciate it... Hope this helps someone in the future...

OK. I understand.... glad you sorted it out. I thought you had the new cross over installed and the tweeter disconnected and the receiver was still going in the protect mode. I have a SPL meter now to watch the Db when I am shaking the house on Bluray movies. Maybe I will save my ears and a tweeter

 

[calimed]

What test did you perform on the tweeter, and what exactly did you observe?

Of course, the most straightforward way to test if the tweeter is working is to unplug all other speakers and disconnect the woofers from the crossover so that the only thing connected is the tweeter. Play some music and see what you hear.

I simply put an Ohm reader on it and got no reading. Also connected it up and heard no sound.

 

[jonnythan]

I simply put an Ohm reader on it and got no reading. Also connected it up and heard no sound.

What do you mean no reading? Did it say 0 or 1 or "open" or "OL" or something?

 

[calimed]

What do you mean no reading? Did it say 0 or 1 or "open" or "OL" or something?

I'll have to go back home and look. I recently bough a VERY cheap Ohm reader. Its not digital. Basically the needle was to the far left overlying the "infinity" sign. The far right being 0.

 

[LAB3]

I'll have to go back home and look. I recently bough a VERY cheap Ohm reader. Its not digital. Basically the needle was to the far left overlying the "infinity" sign. The far right being 0.

When I checked my tweeters and mid horns I wrote down how many Ohmns they were and looked up the specs to see how far off they were. When you get the new tweeter check it and log it then check the tweetrs etc in the other tower. My mid horns were at 10 ohmns and my tweeters were around 6 Ohmn. Your JBL will be different these were on my 1979 Klipsch Cornwalls. A zero reading meant a short in the tweeter. Usually if one cross over has gone bad the other one is not far behind it. I replaced my cross overs in pairs. Call JBL or post up a new topic about your model and see if anyone here has them and has done this. I could be wrong about replacing both of your cross overs but my drivers for the mid horns are expensive as are new tweeters from Klipsch. My old Cerwin Vega AT-15 speakers had a fast burn fuse that would pop if the amp was pushed too hard and trash was sent that would clip the speaker and do damage to the cross over and tweeters and mids.

 

[jonnythan]

I'll have to go back home and look. I recently bough a VERY cheap Ohm reader. Its not digital. Basically the needle was to the far left overlying the "infinity" sign. The far right being 0.

That would indicate a break somewhere in the voice coil wiring. Check the wire going into the tweeter carefully, it's possible you just need to replace that. Otherwise you will need a new tweeter.