Speaker issue with my Pinnacle's

[DTS]

While watching the last several movies I could hear in the one side surround, a rattling sound so I pull the front off today (finally), and 1 of the 2 eight inch woofers has fallen victim to 'woofer rot'. I checked the other side, and 1 of those 2 has the foam starting to crack. So my question is can I just unhook 1 of the 2 woofers on each tower and just run one each until I decide what to do? ...and should I rerun Audessey? I would just tape the ends of the connectors if I were to do so. Thanks for your input. I have the Ultra, so that still covers all the heavy stuff.

 

[agarwalro]

can I just unhook 1 of the 2 woofers on each tower and just run one each until I decide what to do? ...and should I rerun Audessey?

Just unhooking the driver will change the electrical properties of the speaker in unknown ways. I advise that you not do that since you may blow the tweeter. At this time, the best is to disconnect that speaker completely.

Running Audessy will not do anything.

Look at Parts Express for a driver surround replacement kit.

 

[DTS]

I watched the tutorial on Parts express, and what is the purpose of having to remove the cone?

 

[gene]

While watching the last several movies I could hear in the one side surround, a rattling sound so I pull the front off today (finally), and 1 of the 2 eight inch woofers has fallen victim to 'woofer rot'. I checked the other side, and 1 of those 2 has the foam starting to crack. So my question is can I just unhook 1 of the 2 woofers on each tower and just run one each until I decide what to do? ...and should I rerun Audessey? I would just tape the ends of the connectors if I were to do so. Thanks for your input. I have the Ultra, so that still covers all the heavy stuff.

You need to get your woofers reconed.

Check out an article I did on this:
JBL Vintage Speaker Restoration Done Right by Simply Speakers — Reviews and News from Audioholics

Simply Speakers is a great organization to use for this purpose.

 

[agarwalro]

Not sure which tutorial you are referring to, but, this video shows the process.

Since the size and elasticity of the foam determine mechanical properties (read, limits) of the driver, which in turn determines electrical and acoustic characteristics, you need to source the part meant for the driver in question. If not, you will end up with different sounding drivers in the dual driver config. (and at worst, the voice coil may be bouncing off the rear plate ).

Gene's option is highly recommended if viable.

 

[DTS]

Thanks for the input. I guess I meant to say the dust cap for the center, does it need replaced if just doing the foam? The kit I have coming includes cap and foam.

 

[TLS Guy]

Thanks for the input. I guess I meant to say the dust cap for the center, does it need replaced if just doing the foam? The kit I have coming includes cap and foam.

Yes you have to cut the cap out. Once you have the chassis and cone cleaned, you place shims between the voice coil and the pole piece of the magnet. This centers the coil, so you do not get gap rub. The voice coil must not contact the pole piece at all, or the speaker will sound dreadful and totally blown.

Now you glue on the new surround with speaker glue. After the glue is cured you can remove the shims and glue on the new cap.

BTW, you cut out the old cap with a razor blade. A razor blade is also best for cleaning the cone and chassis.

Pure isopropyl alcohol is best for denaturing the glue to make it peel off easier, and will not damage the cone. It takes about 15 minutes for alcohol to denature the old glue.

 

[DTS]

Well I re-foamed my 2 8 inch woofers, one turned out really good, but the other has some 'rubbing' on the voice coil (even though I used the shims). So not sure if I should redo or what. I may pass them along to a friend to deal with because in the mean time I found another pair of JBL s312ii I getting this weekend which is what I have been wanting all along.

 

[TLS Guy]

Well I re-foamed my 2 8 inch woofers, one turned out really good, but the other has some 'rubbing' on the voice coil (even though I used the shims). So not sure if I should redo or what. I may pass them along to a friend to deal with because in the mean time I found another pair of JBL s312ii I getting this weekend which is what I have been wanting all along.

Yes, you will have to redo it.

One of three things happened. You had dirt in the gap and did not clean it. I use compressed air and double masking tape back on itself, so it is sticky both sides, then I run it around the gap.

The other possibility is you glued the new surround under tension, so the voice coil moved when you removed the shims.

The third and worst possibility is that the voice coil former is damaged due to being used with a rotted surround. If that is the case the driver will have to be reconed.