Re: Need Input Processing?

kludge@xxxxxxxxx (Scott Dorsey) writes:

David Abrahams <dave@xxxxxxxxxxxxxxxxxxxx> wrote:
kludge@xxxxxxxxx (Scott Dorsey) writes:

I am also doing live sound with the above dynamic mics into a
Behringer UB1622FX driving Mackie SRM350s (for what that's worth). I
happen to like the sound of my voice through the EV when I can keep it
from squealing.

I am sorry. You need to look at your mike and speaker placement.

I have it tuned now so it works out pretty well.

Wait, I thought you said you had feedback issues?

Sometimes, depending on the mood of the room and mic/speaker placement
and levels.

As you can see from below, I suspected that might be a problem, but
that's a separate question. If it doesn't feed back, will a
compressor help keep the vocals audible above the band?

No more than just a person riding the levels will. Probably less effectively
than a person riding the levels.

I don't have a person to ride the levels, though ;-)

* Would the FMR RNC be an appropriate choice for a live compressor?

Sure, if you're looking for something like gainriding

gainriding? Best Google can tell me is "intelligent compression."

Slow gain changes, to even levels out, rather than faster change in an
attempt to pump average levels up closer to peaks.

I see. Like a person riding the levels, right?

* Would adding compression increase the tendency toward feedback, and
if so, is there anything I can do about that?

There isn't anything you can do except to make the gain before feedback
of the rest of the system as good as possible,

How do you measure "goodness?"

With the master fader. How much headroom over the nominal level can you
crank the master fader up before the syetem feeds back?

If you have 12 dB between your normal level and the feedback level, you
are fine. If you have 6 dB, you are pushing it. If you have 2 dB, you
are in trouble.

Thanks.

so that when the compressor changes the gain, you'll still be okay.
That means careful mike and speaker placement, maybe some room
treatment (even just a carpet scrap on the stage risers sometimes),

Oh, I definitely need room treatment. But that's a whole other bag o'
worms.

Where are you performing?

So far, in my basement practice space/home studio. Have to finish the
demo recording to get gigs :)

Your goal is to keep the signal from the
mains and monitors out of the mikes. That might involve reducing
reflections or repositioning mikes and speakers.

Yes, I need bass traps to start with. That part of the room is really
resonant.

maybe bringing down your backline levels,

Backline? Sorry, I did say I was a novice.

Instrument amps, drums, etc.. Everything on stage that makes live sound
with the PA off.

Okay. A challenge sometimes in this room.

maybe using a parametric and notching out the worst feedback modes.

Yeah, I have a Feedback Destroyer Pro but I've decided I'm better off
without it.

I have never used it. What don't you like about it?

One of the channels introduces a faint squealing noise (apparently as
the filters search for peaks). Aside from that I couldn't get it
tuned so that it didn't make everything sound bad. Seemed to add a
lot of mud.

Can you set the thing up, make the system feedback as much as
possible, set the filters and then lock them all into place so they
never move?

Yes, that's what you do with it.

The Sabine units that Behringer modelled their idea after will allow
you to do this easily... you set the notches at the worst two or
three feedback modes during your soundcheck, then leave them locked
down and shut all the other filters off.

I think there are just too many powerful nodes in my room to make this
really effective. Treatment is a big project though, and will soak up
some valuable space because bass traps need to be spaced from the
wall. So for right now I have to take more expedient measures.

--
Dave Abrahams
Boost Consulting
www.boost-consulting.com
.

Relevant Pages

  • Re: Behringer?
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