before purchasing questions

ymelamed

I was looking for the differences between DRPX, DRPA and DRPA+, the DBX site is very unclear, I did find a document that compares DRPA to DR260, so is there such a document for DRPX Vs DRPA Vs DRPA+?

My system is comprised of Allen & Heath ZED 10FX mixer, Crown XTI 4002 powering 4 Cerwin Vega ProStax PS-12 Series II and I'll soon be purchasing XTI 6002 or a used i-tech/i-tech HD to power 2X18" subs preferably JBL SRX728s, which sound to me like a good match for the CV's.

Considering that the amps already have good prosseccing power, so I don't need the crossover of the DRXX and they have more PEQ's per channel, considering I'm not that good with PEQ's or any eq for that matter, would any of the DPXX's give me an audible advantage over the current configuration?

Another Q, all the lower end DPXX's (DR260 included and under) have a maximal sampling rate of 24bit/48Khz, I know that for downsampling to be unaudible you need a sampling rate of 96Khz or better yet 192Khz, doesn't it mean that it's like putting the sound through an mp3 encoder and playing it back again after the sound quality has been downgraded a bit?

Thank you

Gadget

Your right.. you don't need a driverack with those amps per say..the major differences are in sound quality and feature sets. for instance, the PA+ added mute buttons, real time analyzer, and a much faster algorithm for the auto EQ and a "more foolproof" setup system...

The PX is a 2 in 4 out stereo only version of the DRPA.. but the 260 is by far the best sounding device.

The resolution of the system is perhaps limited by the resolution of the weakest link, but... with most of the live music or playback audio the systems resolution is good enough for most of the audience we play for. In other words..most people would NOT recognize the difference between 48 and 96 or even 192 kz sampling rates...especially using CD quality sound to begin with.

The real improvement in sound comes when you get up to the 260 or above.. there is some conjecture that the PA+ has some phase issues when there are NO processing instituted so we'll see what happens with that...I use one every week (PA+) and Xti's for monitors.. and with the system installed the DRPA+ is fine.. if the system had higher resolution it might be more audible...but within the circumstances...if you don't have a system capable of reproducing higher resolution audio.. your NOT going to hear a difference..

As for parametric equalization, it is more accurate, less destructive to sound, and easier to make broad system equalization with less filters.. and results in less sonic chaos than with GEQ equalization...I think if you sit down with the PEQ's and work with them and LISTEN you will quickly start to see how they work and what you need to do with them. If you consider that using GEQ' you are only able to affect sound in 28-31 ISO centers... there is a LOT of the sonic spectrum left out of those small windows.. for instance...what do you do if the frequency you need to affect falls between ISO centers? (ISO is a standard set up by a panel of engineers long ago) The answer.. with a GEQ you would need to use both centers and your affecting far more of the sonic spectrum than if you were able to zero in on the actual frequency you need to affect.

One aspect I have found useful in the driveracks is the ability to help flatten he system response.. without the necessary skills to do so on your own...to get maximum gain before feedback the system must exhibit as flat a response as possible.. I find it easier to achieve this with the PEQ's, and it generally sounds far better using the PEQ's...
G