Help needed : vibration sound from one of my 604E?s...

**Tralalalala** · March 23rd, 2014, 04:34 PM

Hi,

One of my Altec 604E speakers makes this vibration sound ( something`s loose inside the speaker?! / or damaged ? ) at certain frequencies...

I do not know what to do - The sound is definitely coming from the speaker - NOT the cabinet.

The vibration sound ( that is definitely not meant to be there ) is present at long low frequencies - like on this song : The Hook by Knut Reiersrud on Spotify

Crossing fingers that someone can help me out on this one... probably not much info to go on either for you ...

all help will be appreciated.

**donaldpatten** · March 23rd, 2014, 05:51 PM

Could a nut or some other hardware gotten loose and found its way between the frame and cone?

**bowtie427ss** · March 24th, 2014, 07:43 AM

Have you had the drivers out of the cabinets?

If so, have you over-tightened one or more of the mounting bolts?

Has something gotten between the mounting surface of the baffle and the speaker rim causing the basket to flex or bow?

Check to see that the spider hasn't come loose, or the felt dust guard between the horn and woofer cone.

If the drivers are still mounted as they have been for many years, it could be cone sag, or even cabinet warping if they have recently been moved from one constant environment to a different environment(different temps, humidity levels can make seemingly stable wood change).

Just a few thoughts...............................

**Tralalalala** · March 24th, 2014, 01:41 PM

YES ! - FIXED !

I had as you said - overtightened one of the nuts - the gasket ( the rubber like thing along the rim of the speaker ) had gone out of place and was touching the woofer. just a little bit ...

Thanks !

**VolvoHeretic** · March 24th, 2014, 08:52 PM

Whew!

.....

**bowtie427ss** · March 25th, 2014, 07:51 AM

Glad you found the problem and simple solution.

I think folks often overlook the closeness/precision of the tolerances in the magnetic gap, and between the gap and voice coil assembly in an Altec woofer. It doesn't take much to knock things out of whack, and there is just no room for anything but precise alignment and concentricity. If the coil assembly doesn't travel on exactly the axis of the polepiece, there will be trouble. Pretty amazing machines when you consider that alignment has been maintained for over 60 years in some examples using only a paper cone and wanky looking phenolic(rags n lacquer) spider.