PX with PRX535???

Hovgard

Hi,

I have a set of JBL PRX 535 as tops on PRX518 subs. Alternatively I would at times use a pair of PRX512M as tops. Is the PX a good choice for this set-up or would another driverack be a better option.

I find tunings for only PRX515 and the subs in the manual so it makes me wonder?

Thanks,

Ben Hovgard

Gadget

Ben, your not finding tunings... your finding filters that are set up using the information available from the manufacturer. Its absolutely simple to set up a filter for a fullrange, a fullrange with subs, or any other combination you wish that uses 2 ins and 4 outs. With the PX you could drive 4 fullrange, or 4 subs, or 2 subs and 2 tops...whatever. Typically the smaller the lo speaker in the tops the higher the crossover, or hipass will be. The PX has no alignment delay.

The DRPA is a bit more useful, as it has 2 in's and 6 outs and 10 ms of delay available per channel.

The 260 however has all the bells and whistles, and more features than you can imagine, as well as being a better sounding unit all around. I have then all, and in the lower bracket processors, the 260 is far and away the ultimate unit. It is also easily up-datable should a new download become available.

You can go to the download section and get the 260 GUI and play with it and see what a killer processor it is...

Gadget

Hovgard

Hi Gadget,

Thanks for your reply... I get what you are saying but unfortunately I have to use the PX for now. It has been given to me to work with.... So now, any ideas for resources on how to set up those PRX 535's?

As you can see I am a bit lost here and need an easy and simple way to get it all to work. I have read the manual about max gain and limiting etc. and it is no problem but stuff like what frequencies to set the filters etc..?

Any input would be appreciated!

Thanks,

Ben

Gadget

You could easily use the same setup as the 515's...you could actually lower the HPF for the 515's but it's not necessary...Its only the difference between 46 and 52 hz (the later being the 515's)

The 525's actually have the same response as the 515's and are in the 260 menu and you can download the GUI and play with it and it will recommend filters and hi/lo-pass filters (in this case the HPF/LPF for the sub/tops is LR24@ 81.1 hz (as close as you can get with the DRPA) BTW the HPF for the sub is set @ 24 hz.. but I wouldn't use that...

G

Hovgard

Thanks Gadget!

Invaluable information!

Will check the GUI for the 260 and have a play with it.

Ben

Hovgard

Gadget,

Been away for a while but back in business now, and of course some questions...

I got the PX, and I am a bit confused, when loading the Presets for my Subs, the filter is set to out on the subs, both HPF and LPF and a 118Hz HPF for the tops. (PRX 515 preset used)

So I downloaded the GUI for the 260, and my speakers are there, same thing, the Subs preset is OUT - OUT, the main HPF on the 260 is a 99.2 Hz BW24.

This seems strange to me and I am not sure what to do with it. Any suggestions?

I am upgrading to the 260 by the way, much nicer unit.

Kind regards,

Ben

Gadget

The out means that the subs are allowed to do their own HPF and limiting...
If it has an out for the LPF as well.. I wouldn't use it, bur they're probably letting the sub do both and adding a HPF for the tops to match...

Id be fine with the sub HPF but set an LPF of 100-118 hz and match that with the HPF for the tops, use LR 24 on the xovers...
Keep us informed.

G

Hovgard

Hi,

Thanks for that! It's really great what you guys do for so many people! I have enjoyed reading a lot of your stuff and it has boosted my knowledge and understanding a great deal. Thanks a lot!

For the subs, I understood that was the case, running free :-) I have searched and searched but can't find any info on what the subs built in XO does, except for handing out a 110 Hz HPF to the tops if they are linked.

Would be nice to know the built in stuff actually does, any ideas?

In the GUI for the 260 I find these exact speakers and that preset sets the HPF for the tops to 99.2 Hz, I guess the subs built in HPF is calculated to handle all tops in the range where the 512M would probably be good with 110hz

I will try both right now and see where I end up, will also try a 50hz BW 18 on the subs to see what that brings me.

Will let you know!

Thanks,

Ben

Gadget

Thanks for the kind words. We do try and make sure the info is accurate and up to date with the latest practices. I scour the internet and get the trade pubs and keep up with whats new, and innovative..

As for JBL.. well if you read my work you know I'm not a big fan ... that not withstanding...I found this:
http://www2.jblpro.com/catalog/support/ ... &docid=595
which tells me about everything I need to know..
110 hz @ 48 db /octave filter (probably BW)(that is technically a LPF by the way) which provides a rock wall dropoff...also -3db @ 52 hz and -10 @ 37..there is even a frequency plot you can view... which indicates a peak from 60-80 hz.. probably good for a live kick drum.. but a bit boomy sounding... You might want to consider a lower HPF(37 hz BW18) and a PEQ shelf @68 hz..boost 4-5.5 db with a 12 slope, also a bell @ 74.3 hz Q of 3 and -4-7 db to flatten out that curve a bi and get better low extension... this will lower you output level a bit but it would be fuller and cleaner...

As you may have guessed, the 99.2 hz gets it below JBL's LPF ...BUT it looks like since they list 140 hz as a 3db down factor.. the HPF shouldn't be be there unless the crossover button is engaged...you might want to check that out... it doesn't mean I'd necessarily change a lot but then using the Driverack for total control would be better...

A slightly higher HPF on the 535's might elicit a better low mid.. so I'm thinking the 110 hz would sound a bit better, and the tops would get a bit louder.

Gadget

Hovgard

Hi,

Thanks for that, will try all suggested. PEQ is new to me so a bit of reading done to understand, I think I get it :-)

Looking at the Specs of the 535:

http://www2.jblpro.com/catalog/support/ ... &docid=594

I could also use the PEQ to flatten out the dips in that curve right?

Thanks,

Ben

Gadget

Yes, Those are my suggestion of settings for the PEQ's to flatten the subs...I would look into that dip @ 140-200 hz..for sure...PEQ's are just variable width filters that you can adjust to cover a broad part of the spectrum...and either cut or boost it. If you download the GUI you can see the effect of the different settings I gave you.. It will help immensely in the comprehension category even if it doesn't work ON the PX...
G

tonyp213

Hello. I just purchased the DriveRack PX to use with my PA system. THe system consists of an Allen & Heath (16 channel Mix Wizard) mixer and all JBL PRX sound system. Before the DriveRack I've had no other pieces - such as EQ, Compressor, etc. - in the rack other than SHURE wireless systems. I'm using 2-535's for mains, 2-518's for subs and 2-515's for floor monitors. For now, I've been planning on using the DriveRack for the 535's only as I'm using an AUX send to feed low end info only (keys/kick/bass) to the subs.

I've been reading the posts regarding the absence of a preset for the PRX535. I see that Gadget did respond that the preset for the PRX515 can be used in leu of one. I wanted to know if I should consider using the Preset \"Stereo Mains\" as opposed to the Preset \"PRX515\". Can someone recommend which preset would work best as a starting point.

Also, I've been reading the manual as well but I'm having a hard time figuring out if I can simply choose a preset and then only use the wizard to setup the AFS (skipping the wizard for levels and EQ when available time is at a minimum). I am another one of those users who specializes in private events and unfortunately, typically have little or no time to experiment at most gigs. Any further info would be greatly appreciated.

Thanks for your time... Anthony

Gadget

The preset or stereo mains .. either will work, you simply need to set the HPF.. I believe the 518 is 140 hz.. right?

Gadget