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we are starting a mobile dj company and my qustion today is one about audio?
we are getting a pair of JBL JRX118S 18" Compact Subwoofers and 4 JBL JRX125 Dual 15" Two-Way Sound Reinforcement Speakers...my qustion is 1 what 1 amp should i use with the subs, and what 2 amps should i use with the jrx125s..also will a Behringer MDX2600 Expander / Gate / Compressor / Peak Limiter,,,,dbx AFS224 Advanced Feedback Suppression,,,,dbx 1231 Dual 31-Band Graphic Equalizer go good together or should i just get the dbx DriveRack-PA EQ & Loudspeaker Control System http://www.youtube.com/watch?v=gIMqCDW5ZXc
Note that the expander/gate/compressor/peak limiter goes ONLY in your microphone path. This is usually done through an "effects loop" jack in the mic channel of your mixer. You don't run your music through that.
For the post-mixer processing I would go to ebay and get either a Behringer dsp8024 or a deq2496. Either will handle your EQ, feedback limiting, and peak limiting into the speakers (very important).
Then you just need the sub crossover function. A Behringer EX1200 will do that - sadly they are out of production, but they show up on ebay now and then. I know it has all the bass synthesis stuff, but you can turn that to zero - it still makes a terrific sub crossover and it's usually dirt cheap.
For amplifiers you want something very reliable - amps are notoriously problem areas. I've had great experiences with QSC amps.
edit - added: I strongly disagree about the processing.
The expander/gate/compressor/limiter will keep your mic from picking up background noise and will add a lot of "punch" to your voice. Every DJ you hear on the radio? Their voices have been through processing like this, even on a classical music station (just to a lesser degree). Every vocalist you hear on every song? Their voice has been put through this to the 'n'th degree. That's what you're competing with.
On the output side... you can do without the feedback suppressor (though I find Behringer's pretty effective). You can probably do without the graphic EQ on the output, though these can help with room acoustics. But I would never run without limiting (protects your speakers, particularly the HF drivers) and I would never run without bandpass filters for sub vs. mains. There is no point in sending full-range amplifier power to the mains when you have subwoofers; you are using amplifier power (and cone excursion) on frequencies the mains simply are not going to put into the room. The same is true in the opposite direction for the subs. Sending higher-freq sounds to the sub when it can't possibly reproduce them... by the way that still uses amplifier power.... why on earth would you do that?
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