The church hall where I tech local amdram productions recently had their Carlsboro FOH cabs stolen. Some kind soul has bequeathed them two Peavey ProSys 12 cabs and two 15" 'Bass Flex' bins rated 8ohm 150W rms.

On the back of the ProSys 12's are two 1/4" jack skts and an XLR. One of the jack skts is paralleled with the XLR and they are labelled Full Range Bi-amp Hi. The other skt. is labelled 'Bi-amp Lo'. On the bass bins there are two 1/4" skts, one labelled I/P and the other Hi O/P.

I'm confused - I've been unable to get any info from the Peavey web site.

It seems there may be a passive crossover in the prosys 12's but without opening them up (which I'm reluctant to do) I can't be sure.
Has anyone got the same gear or can someone help? - the system needs to be up and running in the near future for some gigs.

I think you've got it the wrong way round. The crossover, if it exists, will be in the subs. The "bi-amp" connection on the tops allows you to drive the 12" and horn from separate amps. You probably don't want to do that.

Try taking the amp into the I/p socket on the sub, then linking the "hi o/p" to the "full range" on the tops.

Thanks for that, as I said I don't know what's in the tops but taking the rear panel off them I could feel what felt like a small txfmr. inside - the hole was too small to see into. Next time I get down there I'll try your suggestion.

Dave

are these definately Peavey ProSYS?

im aware of Peavey Pro 12's

and Peavey HiSYS 1's (12")

if you wish to look at the back panel, unscrew the grill and remove the bass driver, itll be there to see, removing the back panel is usually a pointless exercise on the Peaveys.

One thing I will say is, if they are a few years old, its very possible the crossover is in the Top Cab. When Peavey did the Hisys Range, the Hisys 1's (12" two way) had a crossover built in and were designed to run with the HiSys 115 (15" bass) which had no crossover
However the Hisys 2's (15" two way) did NOT have a crossover inside, instead it was built into the HiSys 118 (18" bass cab)

used to cause all sorts of problems when customers already had one pair of 15" speakers and perhaps didnt want to buy 18" bass cabs due to the size, yet would need to buy an external crossover!!

I think Bruce is correct.

Maybe the OP is getting confused with dB fLEXSYS?
Or PV HISYS?

John Denim.

Peavey Prosys are an old box from many moons ago...



From memory they could be run in bi-amp mode... (its years since I have seen a pair tho)

Chris is correct, as is the OP. I think the one in the pic is the prosys 15.

And yes daifuse, there shall have to be a cross over of sorts in the top cabinets, as when they're not bi-amped there'll have to be a passive X-over to sort out what goes to the HF unit and what goes to the woofer.

No John, the front label is definitely ProSys 12 and the bins Bass Flex, but I think I'll have to take the bins driver out and investigate further.

Sound in Gloucestershire seems to be on the right track

Dave

I've at last managed to find time to take the drivers out of the cabs. The tops have a crossover but can be connected just as a bass unit using the Bi-amp Lo jack or as full range/bi-amp hi using the XLR skt. The bins have an inductor to pass lo freq. and then feed out to the tops on the o/p jack. Must add that I was very suprised at the poor quality driver in the bins!

Thanks to all for your time and advice - much appreciated.

Dave

I had a pair of bass flex cabs in my first pa many years ago
they dont sound bad for a cheap small bin if you uprate the driver


just the right size for a duo or dj

cliveybaby

Thanks for that - I might just give it a try.

Dave

I still have a pair of Preavey ProSYS 15s and indeed they do have a passive 3 way crossover inside. The XLR input and top Jack (middle connector) are parallel inputs for the crossover. The low o/p of the crossover goes to the bottom jack normal contacts/jack contacts and then into the LF driver. This allows you to break into and power the LF driver from a seperate AMP. It will be un-crossovered.

My judgement of this situation is - a full range amp output should be plugged into the jack input of the bass bin, then a short jack to jack cable from the HI output jack on the bass bin to the jack input of the PROsys12. This is most likely how this was origionally wired. In effect this would be a 4 way passive split system maybe not the best but hopefully answers the OPs question.

I've come to the same conclusion - and it's how I've now connected it. Sounds reasonable apart from the poor bass response even with bottom eq applied. It definitely needs better bass drivers.

Thanks again to everyone for your help.

Dave