Unofficial Mackie User Forums > DL1608/DL806/DL32R/ProDX Mixers
Routing Question
yigba:
I'm getting feedback from my vocal mics with my new QSC KW122's/K181's and wanted to utilize some sort of automatic feedback rack unit to help - I mix from stage and don't have time to experiment when I'm singing and playing guitar. I utilize the DSP from the DL1608 and the internal crossovers on the QSC's. So I thought of the following:
I have a Driverack PA basically gathering dust. So I figured I'd use only the AFS (Automatic Feedback System) system within it to automatically control the feedback. I want to send only the vocal mics (channels 1-3) thru the Driverack so I was trying to use Aux5 for this with with only the 3 vocal channels via Aux 5 sent to the Driverack, (taking channels 1-3 out of the mains in the LR channel) and then returning the Driverack signal (which is channels 1-3 via the Aux 5) to the mains via channel 15 on the LR Master.
I have triple checked the levels on each and they are at the right level - Aux 5 channels 1-3 are at unity, Driverack ins and outs are at unity and Channel 15 on the LR master are at unity. Also the Aux 5 Master is at unity.
This is not working as I am getting a very muddy low level sound out of the mains. When I connect everything with the Driverack AFS on the LR mains out it works fine - a nice strong level out of the mains.
What am I doing wrong?
Wynnd:
First determine if it's monitor feedback or main feedback. You'll want the DRPA between the mixer and the amp for the speakers that are causing trouble. Do set up the DRPA for those amps and speakers, then set the auto EQ. (There are tons of advice on doing that well.) Then set the anti-feedback. If it's monitors and you feed that amp with aux6, then place the DRPA between Aux 6 and the amp driving the monitors. Don't do anything else. Nothing else works with that unit. (I've got one. I like it and it does what I need.)
ijpengelly:
I'm with Wynnd, whilst I see the logic in what you are trying to do, it would be much more straightforward to put the DRPA between the mixer and the speakers where you are getting the feedback, i.e. FOH or Monitors.
Are you ringing out the system before you start your set? You can get apps for your smart phone that will give you a crude but useful spectrum analyser to help EQ out any feedback.
Other things to examine are:
- your mic position in relation to the speakers,
- using pre-DSP on monitor feeds then EQing the monitors to remove the feedback,
- EQing the main PA in a similar way using high-Q notching
- a change of mics to something with a tighter pattern (Rode M2?)
Hope this helps.
yigba:
It's FOH that's feeding back.
Prior to the QSC KW122's I was using Bill Fitzmaurice OmniTop 12 speakers and never once had a problem with getting to the optimal vocal volume and FOH feeding back.
With my thought I was just trying to kill the feedback on the vocals so the entire mix isn't affected but I guess I can just leave the DRPA on the whole mix.
But just out of curiosity - why doesn't my method work? Shouldn't it? I mean sending an AUX 5 to an external processor and back to the board via channel 15 with all the gains at unity should return the same signal, no? Isn't that how to use external effects with the DL1608 - or any board?
WK154:
Could be any number of things causing it not to work. IIRC the PA+ in my case is a 2 in 6 out unit with it's main function to provide a separation of frequency ranges. So my first question would be which output are you routing back to CH 15? Have you listened to the PA results? I'm not sure if there is a bypass in this unit. The other possibility is that your running into phase issues due to the delays or stage wash pickup in the Vox mics. It's always best to treat feedback at it's earliest point ie. the channel or before. Mic position and type play a significant role in this. It's also easy to create a unintentional feedback loop in these mixers. It could also not be Vox creating the feedback.
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