- USING A DBX DRIVERACK 260 WITH QSC PLX 3402 AMPS FULL
- USING A DBX DRIVERACK 260 WITH QSC PLX 3402 AMPS DOWNLOAD
If your mixer does not have these features just make sure you have no clipping and sufficient signal to not run into signal to noise problems.Ħ. Disable the AFL(s) (after fader listen) on the mixers master output channel(s) and enable the PFL (pre fader listen) on the mixer input channel (with pink noise). Set the mixer input channel fader (with pink noise) at "unity" (0dB).
USING A DBX DRIVERACK 260 WITH QSC PLX 3402 AMPS DOWNLOAD
Note: Please click here to download a 20 minute pink noise track (track58.zip) by courtesy of Michael "Bink" Knowles.
USING A DBX DRIVERACK 260 WITH QSC PLX 3402 AMPS FULL
Play pink noise through one of input channels of the mixer because it's consistent dynamically.(equal energy to all frequencies with a crest factor that is consistent across the full spectrum) We will set those things after we are roughed in.ģ. Make sure all DriveRack dynamic processors like GEQ, Compressor, limiters, PEQ, AFS, SubSynth, etc., are disabled. Turn amplifier(s) attenuators all of the way down to zero (fully counter clockwise), disable amplifier(s) clip limiters (if used), and disconnect the speaker cables.Ģ. I will post the what is missing in so you can see the the info in context and hopefully clear up some confusion.ġ. As you can see I only posted the the part for setting the limiters. Don't think thats good.Īdditionally, I have set up my system according to " Driverack, Gainstructure, And Sytem Setup" from the dbx user's group site. Should I just just use the limiter on the amp (non deafeatable) and forget the limiter in the drive rack? If I do use the limiter in the Driverack, I would be double limiting. I am also using an EV CP2200 amp to drive a Pair of MRX 518 subs which does have a built in limiter. You'll need a voltmeter, but it's a simple procedure. It lets you set them to match the speakers. You might want to have a look in the Guide for Goobers sticky thread for dboomer's procedure for setting limiters (post #24). You do have to understand that you could damage a speaker with the DRPA's limiters set with this method. It would have been hella easy if you had a PLX1802, just engage the built-in limiters and you're good to go. 550w from the amp, into a 400w speaker is a pretty good match. Zonked, this method is possibly workable for your amp/speaker combination. If you have an amp that's way big, this method will ensure your amps never clip, but that's kindof a moot point if the amps have smoked your drivers.
What I'm seeing is no way to address the needs of protecting speakers. The amp's clip limiter will also track AC line voltage which the speaker processor's limiter will not. They are guranteed to limit at the point of clipping, so if this is your intent then don't even bother with the limiting section of the speaker processor. Bring mixer's master fader(s) all the way back down to off, re-enable your DriveRackĪlso, there is no reason in the world to disable the amplifier's clip limiters. The amp will never clip, if proper gain structure and limiter setting techniques are observed.ġ4. This feature (along with Attack and Hold time settings) will take a +24db signal that will be limited, starting at +17db, then at +19db the 260 slams the door and lets nothing more pass. Regardless of the Over Easy setting, if the Limiter threshold is set to +17 db and the amp will clip at +20, the 260 can have an "Overshoot" set as 2db (or more). Note: The DR260 can be set with a maximum "Overshoot". The limiter may reduce the output by 2 or 3db, but it WILL let pass the remaining peak output, which is well into, and beyond, the clip point of the amp. For example: With a clip point for the amp at +20db and a limiter threshold at +17db and the limiter, depending on the use and setting of the Over Easy, may successfully reduce an output at the limiter section of a +19db input. Note: The DRPA, unlike the 260, DOES NOT have a brick wall limiter. Note: It is highly recommended to re-check the DriveRacks output limiters if the X-over gains have been changed, or if any "enhancements" have beem made using GEQ, PEQ, or Sub-Synth afterwards Return the amp to the previously marked spot. Lower the threshold until the amp stops clipping. This gives a softer, less noticeable limiting effect. For the selected output, select Over Easy as on. Select the section that needs to be limited (all need to be limited).Į. For example: 2-way (Hi and lo) has 2 limiters, 3-way (hi, mid, & lo) has 3 limiters. There is a limiter for each x-over section that it set up. Press the "Comp / Limiter" button 2 times to get to the Limiter section.ĭ. After turning down the amp and marking the point where the amp stops clipping, turn the amp up to where it clips again.Ĭ. Determine the clip point of all amps by setting the gain structure.ī. Dra's "Super Duper Limiter Procedure" (below) before going to step 14.Ī. Note: If you're planning on setting-up your DriveRack output limiters follow Mr. The mixer I am using is the Soundcraft MFX12/2.
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