Home Theater Forum and Systems banner

1 - 5 of 5 Posts

·
Registered
Joined
·
8 Posts
Discussion Starter · #1 ·
I have a large room ( big box ) with several hi-Q resonant frequencies ( church )...

The room has several frequencies ( 6+ ) where feedback becomes a definite problem to be overcome...

I run the mixer output into a Behringer Feedback Destroyer which works great...
Next is a 31 band EQ used to flatten the room response...

My question is, which of the two devices ( feedback destroyer or 31 band EQ ) should come first in the chain??

I can make an argument for either way but what do you think???

TNX much from DaveR
 

·
Super Moderator
Joined
·
9,280 Posts
I think I'd put the Feedback Destroyer in first, because your overall room flattening may include some boost to the frequencies the mic(s) are feeding back at.

That said, I don’t know that I would daisy-chain them like that. I’d suggest sending all the mics to a subgroup (or at least the ones with feedback problems) and then insert the Feedback Destroyer on that subgroup. Alternately, if only it’s only one mic with the feedback problem (e.g a lapel mic) then I’d insert the FD on that channel only.

Regards,
Wayne
 

·
Registered
Joined
·
8 Posts
Discussion Starter · #3 ·
Thanks very much, Wayne...

It IS only one mic which is all we use 95% of the time, BUT the room needs EQ all by itself, and the dominant modes of hi-Q feedback looks like a very large RF cavity with about 6 dominate modes or frequencies where a 6db hole is punched and certainly takes those problems away, always the same frequencies too, so I opened the BW up to 3/60 octave first, then the 31 band EQ does a nice post over all job, plus I shut down the base below 200hz and everything over 8kc. is also dumped...
There are some really complex feedbacks at 10kc +/- so it now looks like a clean wideband telephone circuit where most of the voice energy is...
Thanks for the good heads up... We agree and it does sound OK...

The contemporary music team is a sub group and they do their own conditioning...

DaveR
 

·
Premium Member
Joined
·
15,054 Posts
Gotta love church design of days past. Looks are taken into first priority and the acoustics are not given much thought. Our old church seated 1800 and had a large pyramid type design (from the floor to the highest point was 80ft and all wood beams) it was a acoustic nightmare. Our new building was designed around sound and what a difference that made.

I agree, the 1/3 EQ should be placed on the mains just before the amp and the feedback destroyer on the sub group with the vocal mic/s. Have you given any thought is moving the house speakers forward (yes I know that may be a huge task) It sounds like some of your issues could be fixed by moving them.
 

·
Registered
Joined
·
8 Posts
Discussion Starter · #5 ·
Thanks, Tony for the inputs... This church is the last of the original Pilgrim churches and this ( the fifth ) building was built in 1850 complete with embossed tin ceiling and lots of windows...
If it were an RF cavity I would have a very narrow passband filter with peaks around 8 mhz... No need for that but I did fairly well as described and with consensus from y'all...
Thanks much from REW audio student DaveR

* this is a great venue...
 
1 - 5 of 5 Posts
Top