please help me get rid of feedback

lilfes

can someone help me get rid of these feedback im having my set up is
2 jbl srx738
qsc rmx 4050
lexucon mic pre amp
dbx 234 xover
dbx 166xl compressor
mic shure beta 87a
connection: jbl srx738>>qsc4050>>dbx 166xl compressor>>dbx 234 xover>>lexucon mic pre amp>>shure beta87a
this set up is for a home karaoke i dont know what im doin wrong either im connection wrong or something everytime i turn up the music and try to sing then i get this crazy feedback and im scared if this keep happenin i might blow up something the compressor i adjust all knob set at 12 o clock and the qsc 4050 i turn the knob only to 30db sorry im just a noob i was just told to set up like this and everything should be perfect i feel the power when i just play cd music but when i start to sing karaoke it just dont work i get this loud feedback and it scared the shit out of me can someone please help me thanks i really appreciated

Gadget

Well I think you left some things out here (like a mixer?) I mean how can you play music with that setup? I suspect it's the

compressor...take it out of the system and try it. This is troubling to me:

i might blow up something the compressor i adjust all knob set at 12 o clock

dbx shows the knobs all at 12 o'clock, but the actual settings when properly set will look NOTHING like that... why are you

compressing your voice anyway? are you an inexperienced singer? With dynamics that are all over the place you are trying

to control? Compression can cause feedback as the compressor hunts for sound if set up improperly.. also, with only a set

of SRX738 why do you need a crossover? are you bi-amping them?

Look, JBL is known for being harsh and high endy...add to that a compressor set to a 2:1 ratio (12 o'clock) with the

threshold set @-10 (12 o'clock) (and god knows what the button positions are) is a recipe for some piercing feedback...

Before you put the compressor back in to the system you need to read up on compressors.. type in "Compression" in a

Google search and follow the links... read the dbx paper, "Compression 101"
ftp://ftp.dbxpro.com/pub/PDFs/WhitePape ... %20101.pdf

I suspect you'll have more questions.. if so please include ALL equipment in the chain.
Gadget

lilfes

sorry for the bad grammar im very new into this i was just told what to buy and i went out and buy them i really dont know what the compressor do i thought it for the feedback but i guess wrong and im using the lexucon mic pre amp to control the music volume im am a inexperience singer like i say this set up was for a house karaoke not for gig and with the crossover i had a woofer with it then it got blown so that why i didnt took my crossover out and for the button on my compressor is all in well beside the stereo couple that the only button is out sorry for all the stupid question im asking it seem like people at guitar center dont really know what they doin or im just asking the wrong person

Gadget

So did you take the compressor out and try that? Which Lexicon model do you have?
G
I understand your English may be weak.. don't give it another thought..

lilfes

is a lexucon elite da-9990k and yes i took the compressor off it was worst then when i have it on i cant even turn the qsc amp more then 28db and the lexucon amp volume was on 1/4 right when i turn on the mic then the feedback started to sound is it maybe i have a small room my living room is 25x25 in your opinion with my setup what the best way to set the compressor or that i dont need it

Gadget

Can you send a link to that (lexucon elite da-9990k) piece? I can find nothing on it...
G

Gadget

Also, do you have anything other than that Beta 87a? It's a condenser mic and is VERY sensitive to spl levels...
G

lilfes

hmmm that weird their no link for that lexucon well it a karaoke mic mixer with power amp im just usin that one for the microphone that it and just to adjust the master volume up and down on the remote control and also i use a vocopro microphone well on those vocopro microphone i dont have much feedback as the shure microphone but the shure microphone sound so much better than my vocopro one

Gadget

Ah... so we have come to the culprit then...As I indicated that mic is a condenser...meaning that it is extremely sensitive...pretty much your system needs to be tuned extremely well for that mic to be used in that situation. IF, you had a Driverack that you could tune your system extremely flat you could probably use that mic as you want... BUT under the circumstances you will find it is the center of the feedback issue.
sorry...
Gadget
Where are you exactly? for a few bucks more than the Beta 87a you could get a driverack PX and have the ability to tune, and equalize your setup, and help protect your speakers...you 223 won't do that...

lilfes

aww this is suck i was trying to avoid putting more money in this set up i just found out about dbx afs224 feedback eliminator would that work if i can try to sell my compressor with my set-up do i really need a compressor

Dra

Describe the room. size, shape, surfaces, furnishings, etc. Maybe some room treatment would help.

DRA

Gadget

No Dra you'd have to have been following this all the way to understand... maybe you were I don't know but..

No the AFS224 won't do the job by itself... the PX has that built in BTW.. If you want to use that mic you will need a system that is well tuned and flat AND you'd need some skill to boot (mic technique wise...) Sorry dude you got sold a bill of goods in a way.. No you probably don't need the Compressor... Why not sell BOTH the analog crossover and AFS224 and get the PX in their place... you could maybe return them to the GC and tell them your REALLY REALLY upset about this, and get the PX.. then you might be able to use the mic... otherwise, get a different.. DYNAMIC mic...the condenser is just too sensitive for the setup the way it is...
Gadget

lilfes

Gadget thanks a bunch you been very helpful thanks for puttin out the time and help me with all this stuff i wish there a quick class i can take and learn all this to adjust everything and knowin what every thing do and also can you give me the exact model the PX you were talkin about and also with my speaker is it better on full range or bi-amp

lilfes

nvm i found it the dbx driverack PX hmmm that really look like excellent idea but i guess i have to do alot of rewiring cause im using all 1/4 jack wire and also i read up on it i dont see guide for my kind of set up and also how imma connect my lexucon to the driverack px

Dra

I understood that this is in his house and using for personal karaoke. It could be hard surfaces all around and be very reverberant. Just saying. Unless I missed something else. (It's happened before.)

DRA

lilfes

my living room is 25x25 with high ceiling 2 story house furnish is just 3 pc couch and coffee table no picture frame or anything hangin tv in the center all the equip is below on a tv stand and 2 jbl on both side left and right i did have a woofer in the back of my couch but as of right now im not using it cause it blown can it be im to close to my speaker when i sing i would say i will be about 17-20ft away from the speaker when i sing

Dra

So, you are standing close to the wall (at your back) and facing the speakers when you sing? Sound like trouble. Is the wall behind you just a flat surface?

DRA

Gadget

Ya... and he's using a VERY sensitive condenser mic for the vocals.. you ever use a condenser mic Dra?
:arrow:

lilfes

well behind me is not exactly a wall i still have another about 8x8 just enough for 6 people breakfast table the reason i didnt include it i just want my system be like gadget where the microphone is about 1-2 ft away and there no feedback at all i guess it wont happen to me gadget do you mind sharing your set-up

Gadget

i just want my system be like gadget where the microphone is about 1-2 ft away and there no feedback at all i guess it wont happen to me gadget do you mind sharing your set-up

Ok, we have determined that the problem here is an overly sensitive microphone on a system/speaker set that is peakey and overly bright.. a bad combination... but NOT one that cannot be fixed...

The recommendation of the DRPX would replace the compressor and the 224 crossover and offer the tools needed to set up this system to be able to use the "overly sensitive" Shure Beta 87a condenser mic...

I guess I'm not certain what you mean by :

gadget do you mind sharing your set-up

:?:

I thought I had?

If your looking for specifics, you need to have the PX in hand and be able to use it with your system... and the setup info we have provided for you here in the "start here" thread and the "FAQ section".

Otherwise you need to go with a different mic...one that is NOT a condenser...a dynamic like the Audix OM7 or maybe the Heil PR35 or some other great sounding dynamic mic (not the SM58.. a great mic for years but not the highest fidelity mic around, but one that is great at rejecting feedback...)

More info needed.please be specific what you are asking...
G

lilfes

is the drpx hard to adjust?? can it be just plug and play?? oh for my jbl srx738 is better to run bi-amp or full range??

Gadget

Bi-amp is always better... but definately not plug and play... JBL provides the tunings, but they would need to be entered manually, and the PX has no alignment delay (JBL specs a .25ms delay for the mids...

The PX isn't very difficult to set up, we can help with that. It's pretty much got a wizard that helps set it up, but you can define the setup to fine tune the setup. The Auto Eq is not foolproof, but again , we can help you through it.
G

lilfes

even with my qsc4050 amp i should still run it bi-amp?? can i blown out my speaker with that amp??