Cabinet Wall Vibration

[adrrad]

I just want to let you know that I do not know very much about speakers. I've got a pair of a 2nd hand JVC 3 way loudspeakers. Once home and hooked to the amplifier I've noticed o strong vibration and bass distortion of one of the loudspeaker. Everything's fine at low volume, but once the amplifier volume overpasses 1/3 of the volume scale, the loudspeaker starts to vibrate and to distort the bass. I realized that it was the cabinet. When I pressed the lateral right wall of the cabinet with my hands, the vibration disappeared. It is very clearly for me that the cabinet vibrates. What should I do to fix it? Is there any chance for me to fix this issue? Thank you in advance....

Adrian

[Cal Weldon]

Hi Adrian,

It may be that the speaker was dropped and a glue seam or two have come loose. Maybe you can install a full corner block to rejoin the sides?

EDIT: You may have to do this through the woofer hole if there are no removeable panels.

[planet10]

if only one speaker does it, Cal's diagnosis is probably correct.

And it may not have been dropped. A large number of cabinets in commercial speakers are just poorly built.

New cabs would be the ultimate fix, but making sure the cabinet that exists is "tight" and the addition of more bracing (hardwood or plywood strips attached edge-on to the box can usually be added).

Also make sure the bolts/screws holding the drivers are cinched down tight.

Pictures?

dave

[adrrad]

Thank you Cal and thank you Dave for your replies. I think I know what's to do. Do you know a site where I can go and see how to fix it? I wanted to attach 2 pictures: front and back, but I did not know how to do it. Looking at the back side of cabinet, I could easily see that the cabinet has been hit or dropped… The speaker model is JVC SP-74BK.

Thank you,
Adrian

[Cal Weldon]

Adrian,

To post a pic, just click the browse button under the reply window. It can't be very large though so use a low res shot. You can post one pic per window.

[Ang]

could always try popping out the driver and superglueing in a ceramic tile on the wall.

[TerryO]

Originally posted by Cal Weldon
Adrian,

To post a pic, just click the browse button under the reply window. It can't be very large though so use a low res shot. You can post one pic per window.

Cal,
I've wanted to post pictures in the past, but have never done so. What size picture is appropriate?
Thanks,
TerryO

[Cal Weldon]

Terry, it will tell you when you post. I think it's about 100K but I have had some slightly higher pass.

[adrrad]

Maybe it's a little bit late... I just found out how to add pics... Here are the pics with my vibrating cabinet explaining the "hot" spots...

[adrrad]

The back of the cabinet tells you its history....