Crossovers, Etc

[HeadlineDJ]

KJDJ,

I spoke directly with Peavey on this prior to posting the first post above..

Basically.. I have what are as close to your SP7xx's

They are Bi-ampable and Peavey reccomends running them in this mode.

I get enough highs, it's more low end grunt I need.

The 15" fitted are the same as you find in the 215xt subs.. Black Widow drivers.

They require a crossover Freq of 150hz down.

Peavey say their 22xt is 40W rms and should not be run straight from a crossover, no matter what freq you set them to.
THey said they need CD equalization, which they told me is a FLAT frequency no boost etc.. this CD EQ stops them from being overdriven by certain frequencies.

Sounds to me a little like a compressor/limitier but for only specific freq bands.

I have a crossover that hasvery adjustable crossover points for hi, mid, low, sub.

Each channel has a level control also.. but Peavey said, without CD EQ they will blow!


Currently I run them in full range mode..

The 22xt acts as a mid - hi driver the 2 15"s are subs.. if I muffle the Horn you can't audiably here the 15"s but you can bloody well feel them [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]


I'm going to try peavey again,, and push them for some written info on how the CD EQ works as compared to non CD EQ.

It's funny as there are only a few of their range that specifically require CD EQ, most others can be run normally with any EQ / crossover you require.


Ultimately I want to run each set of dual 15"s from an amplifier each side. and run the two horn via the correct crossover/EQ from a single stereo amp.

Though the smallest amp I have is 750rms pr channel... [img]style_emoticons/<#EMO_DIR#>/huh.gif[/img] I think the comp/limiter will be used on the highs.


I'll re-post any info I can get on the inner workings of Peavey CD EQ theory.

[KJDJ]

I run JBL SRX mid/highs and Eminence KiloMax 18"s

CD EQ is a common term used for the extra upswing in the highs you need to make Constant Directivity horns sound flat.

I think we may have misunderstood Peavey a little. When they say filter they must mean the high pass filter for the horn/driver. You write the crossover is 150hz down for the woofers, no way! that would mean every thing from 150Hz and up is sent to the horn/driver.
the lowest recomended x-over for the 22xt is 500hz

Are you sure they didn't say 1500hz this would make much more sense.

Subs are driven 150hz and down depending on the room.

Also comp/limiters will make the audio more sustained that is the compressor will make the quiet sounds louder thus the total rms power greater. A mis setup compressor will fry amps and speakers very quickly.

Anyway make sure you are clear about BI-amping before firing things up. And when you do keep the voulue real low while you test.

[DJMC]

Kevin, I'm running JBL 2220-h 15" bass/mids and 2" titanium comp horns (they're my SR-X clones in Genz Benz enclosures)

but my 18" boxes contain Eminence Kappas (sigh)

[Free DJ America]

My question is, what is the fascination with DJs using electronic crossovers?

If your speakers have built in (passive) crossovers (99% of DJ speakers have these), you are totally screwing up the response curves.

Electronic crossovers are designed to be use with some of the live sound reinforcement touring speakers which have no internal xovers, or with the handful of DJ speakers that employ by-pass.

[Free DJ America]

Originally posted by HeadlineDJ@Jan 6 2004, 10:45 PM
I want to drive the subs from seperate amps and drive the 22xt with my Peavey DPC-1000 amp.

Headline, Why?

I mean why would you want to run your setup like this? Is there some problem you're trying to correct, or what is the reason for wanting to change it?

[Wolfie]

Originally posted by Free DJ America@Aug 20 2005, 01:11 PM
My question is, what is the fascination with DJs using electronic crossovers?

If your speakers have built in (passive) crossovers (99% of DJ speakers have these), you are totally screwing up the response curves.

Electronic crossovers are designed to be use with some of the live sound reinforcement touring speakers which have no internal xovers, or with the handful of DJ speakers that employ by-pass.

Cheers, Todd.

Active crossovers may seem unnecessary when today's active speaker systems are considered. Powered speaker systems have made life in this business much easier.

For us Luddites (hard heads, strong backs & weak minds [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]) who insist on doing it the hard way -- running bi- or tri-amped sound with traditional amps and passive speaker systems, the electronic crossover is a must. Passive crossovers are OK if you have only one amp to work with. But the amp is working overtime to produce the full range of sound from the cabs.

Another consideration is the venue. We've done some rather large shows that were wall-to-wall people. We're hired to thump 'em out of their chairs -- the more thump, the better. A pair of full range cabs driven by a single amp simply won't do in these situations. The DJs in our local networking group know us for our system. They pass the big gigs to us because they know we can handle 'em.

We've done full-range, bi-amp and tri-amp. The active crossover tri-amped system produces the sweetest sound yet.

I hope it helps.