You're right Brad - aux-fed subs.
The band's kitty is slowly increasing so we should soon (this year) be getting a MixWiz3 16:2 to replace our current Peavey RQ2318.
I'm trying to put together a connectivity plan for our rig (always feels too cheesy to use "rig" to describe a weekend warrior's band PA, but it's quicker to type than "set-up". Or it would have been if I hadn't typed this qualifier
), so any one of the band could hook it up without always relying on me.
I intend to have one rack carrying the mixer, all eqs and crossovers, with a custom connections panel on the back, and another rack carrying the three amps.
In previous posts of my own and by others, I've gotten loads of advice on aux-fed subs, mixer choice, simplifying connectivity and more, so before we decide on a revamped rig, I want to know as much as possible to avoide choosing inappropriate gear.
So the diagram I attached shows the aux-fed subs signal path of our intended new rig.
Our subs amps are two Yamaha P5000Ss.
We currently own:
DBX 231 eq
2 x P5000S amps for subs
1 x JBL MPA750 amp for tops (may need to replace with a third P5000S if our old guitarist asks for it back)
2 x JBL JRX125 tops
4 x JBL JRX118S subs
2 x TC M300 effects
Tempting as it may be for some of you, believe me - I've heard plenty of flaming of the JRX speakers, but they're what we have for now, so leave me alone . . .
What we want to aim for is dual mono mains (nothing panned from centre - that makes it dual mono rather than stereo, yeah?) from MixWiz LR main outs into both channels of our current 231 eq, then into both channels of a new crossover (thinking of DBX 223 or 234), then into both channels of our current MPA750 amp and on into the JRX125s.
This dual-mono method allows us to raise or lower the volume of either left or right speaker stacks - some of our venues have a dancey side and a sit-down-and-chat side. I understand that the left/right separation functionality will be lost for the mono subs, but I plan to close-couple the subs in centre whenever possible, so it's not an issue, is it?
We thought the aux-fed subs could run from the MixWiz mono (dedicated aux-fed sub) out into our current DRPA, using the parametric eq (rather than the 28-band eq), to focus only on the sub frequencies (if necessary), and the crossover, then into our two current P5000S amps and on into the four JRX118Ss.
I had a look at the DRPA manual and I didn't see anything that confirmed that a single mono input could be summed to the two low outputs, though I'd assumed that the DRPA would be able to do it.
My mistake. I went back to the DRPA manual - the two inputs ARE mono summed to the two low outputs in two of the crossover modes:"The crossover is stereo linked. Adjusting a parameter affects both the left and right outputs
of the current frequency band. For the 2x3 and 2x5 Crossover, the Left and Right inputs are
summed to produce a Mono signal that is processed by the Low Band Pass filter. After filtering,
the Mono signal is fed to both the Left and Right of the Low band output."
I'll have a look at the P5000S manuals to see if the signal can chain out from channel 2 of one amp to channel 1 of the second amp.
Just did:"STEREO/PARALLEL/BRIDGE switch
Use this switch to select the operating mode.
• STEREO mode
Channels A and B operate independently (as with a conventional
stereo amplifier). The Channel A input goes to the Channel
A output jacks, and the Channel B input goes to the
Channel B output jacks.
• PARALLEL mode
The Channel A input signal is output through both the Channel
A and Channel B output jacks. The Channel B input jacks do
not function. Channel A and B volumes can be independently
• BRIDGE mode
The Channel A input signal is output from the BRIDGE output
jacks. To adjust the volume, you must use the Channel A volume
Doesn't say if the signal is present at input B. I'll e-mail Yamaha. In the meantime, do any of you guys know?
Just spoke with Yamaha UK tech support on the phone - the signal is not present at input B. He suggested chaining from the amp 1 channel A input 1/4" jack (the input from the crossover will be into the channel A XLR input) to the second amp's channel A 1/4" input jack - how's that sound to you guys?]
This brought me to the question in my OP. It seems that to send a singal from both left & right low outputs of the DRPA, it needs to be receiving signal into both left & right inputs.
I'm sure there are better or other ways to achieve what I'm talking about, but I'm trying to achieve aux-fed subs with a MixWiz3 16:2 with the minimal outlay.
We'd be selling:
2 x TC M300 effects (MixWiz has built-in effects)
We'd be buying:
DBX 223 or 234 - I haven't researched which one suits purpose best for the lowest spend
Compressors - maybe 2 x DBX266XLs? We currently use the compressor from a TC M300 on the vocals in an effect send/return - that suffices, but the flexibility of having four dedicated quality (and good value) compressor channels to insert as required would be good to have.
One of the advantages of the MixWiz over the RQ2318 is the ability to run 4 separate monitor sends, so we'd probably also be buying another two dual 31-band graphic eqs - probably two more 231s.
We currently have no EQ on our two monitor sends. Monitors are 4 x active HK Audio Powerworks RS122MAs.
Thanks for the replies folks,
Now, where was I? Oh yeah - work!