Ampeg vibration

cavernplayer · Post by **cavernplayer** » Sun Feb 04, 2007 6:04 pm

I recently purchased an Amped 115 HP combo(off Ebay) and at higher volumes when striking certain notes, I hear a definite buzz in the cabinet. Is something like this common and if not would it be serviceable? Any thought? Thanks.
cp

rollingricker21 · Post by **rollingricker21** » Mon Feb 05, 2007 12:12 am

Sure its not the resonate frequency of the room that your hitting to get that sound?

cavernplayer · Post by **cavernplayer** » Mon Feb 05, 2007 3:33 pm

Could you elaborate a bit more? I'm using the amp in my basement. Could that be the problem? Thanks.

cp

cavernplayer · Post by **cavernplayer** » Thu Feb 08, 2007 5:04 pm

One more time?

thx1955 · Post by **thx1955** » Thu Feb 08, 2007 5:13 pm

You might try having someone else hit the notes that are causing the vibration, then try to feel where / what on the 115 is causing the buzz, from there you may be able to either brace the area, or tighten up mounting bolts etc

rickaddict · Post by **rickaddict** » Fri Feb 09, 2007 3:32 am

This thread from a few days ago covered similar ground, Steve:

http://www.rickresource.com/cgi-bin/discus/show.cgi?tpc=5&post=304441#POST304441

Good luck!

Also...you might want to go around your cabinet inside and out with a screwdriver and make sure everything is tight.

rictified · Post by **rictified** » Sat Feb 10, 2007 1:47 pm

When you hit the resonant frequency of a room that note will be a LOT louder than all other notes and will also hang in the air, it is like being inside of a pipe organ pipe, takes a split second for the air to stop vibrating. I've had that happen to me a few times bit it isn't common. It will not happen in a basement unless you have a huge one.

elysrand · Post by **elysrand** » Sat Feb 10, 2007 4:51 pm

If it is really pronounced, and it is happening because of the room's reflection characteristics, it sometimes helps to move your cab over a couple of feet and forward or backward a couple of feet, also turn it inward or outward ten or fifteen degrees, to see if it makes a noticeable difference. I have had just such a slight change do away with a resonant peak in a room. More often than not, though, it will not do a lot of good because the wavelength of bass notes is so long, and that slight a change will have no effect as the move is only a small fraction of the offending wavelength. The angling of the cabinet has greater effect usually than the translation of the source point obtained by moving the cab side to side.