New discussion for dctommy,

Spun off from Do bass frequencies build up over time in a room?

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Our band is getting some boomy feedback at a bass frequency on the A string of bass guitar. It is very strange and causing us alot of trouble and concern when we play out live. We are running bass guitar thru T1 and 4 bass bins.

When we shut off drum mic input into T1 to isolate and sometimes even when we drop off bass guitar input into T1 to isolate, it still appears. Only goes away when you shut down master volume control on T1.

Any ideas?

dctommy

Here is how I solved boominess.

1. put bass bins a gramma pad to isolate them so you don't get coupleing.

2. simply cut the bass on the eq of the remote. (I have a classic)

#2 really cleaned up my sound at practice, which is always boomy on certain notes. The room is pretty much square. I'm told this is probably, "standing waves."

Use the eq on the T1.

Cut it to say -3 and then sweep the frequency until the boom goes away. It will most likely be around 80hz-130hz or so. This can cut the boom and still give you the power.

You can also use this to get some more punch out of the B1's (I give it a slight boost around 120hz-160hz or so when the mood strikes me).

(edited to add more info)

Use the Para EQ to notch out the A enough to get rid of the feedback.

Thanks for the eq idea...we tried that but had the wrong frequency....the open A string is at 55 Hz....we were notching at 180 Hz (B1 crossover frequency?)

I will try a sweep thru 50 - 150 hz with para
eq and notch it out

dctommy

If you have the latest version of the T1 firmware then it should read the note name on the Para EQ as you tune the frequency. The latest versions are available on the wiki at the following link.

Downloads

Tom

quote:

Originally posted by dctommy:
When we shut off drum mic input into T1 to isolate and sometimes even when we drop off bass guitar input into T1 to isolate, it still appears. Only goes away when you shut down master volume control on T1.

Any ideas?

dctommy

Hi dctommy,

If you turn down the input of the bass guitar and still get feedback, it doesn't make sense (to me) that the bass guitar is the problem, unless you have a sizable boost of the low frequency control. Turn it down.

Are you using an acoustic bass guitar?

What else is attached to the L1 in question?

Is it possible that the bass is exciting an acoustic guitar? Or vice versa?

Try cuts at 110, 220, and 440 hz.

If you have phase switch on bass or acoustic guitar try it.

Move slightly farther away from B1s.

That's about all the ideas I have.

O..

That's a great tip-thanks!

quote:

Originally posted by Tom Munch:
If you have the latest version of the T1 firmware then it should read the note name on the Para EQ as you tune the frequency. The latest versions are available on the wiki at the following link.

Downloads

Tom

You're welcome, Eric.

Tom