JBL JRX125s

Made in Taiwan or China for Harman?

i'll try that bass boost..
cheers.

£250 a pair??...where was that??

Hi Guys,

Glad you see the same shortcomings as I do, gives me faith I was processing them in a sensible way.

i think the comp is an OEM 'P.Audio PA D25'. looks the same to the ones ive replaced. Deffinately can be harsh, especially on live work, but used on dance music, i find it makes a really crisp clear sound.

I've done the selenium d210 replacement and a couple other mods to my JRX 115's
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=264-235 (US, but you can get specs/datasheet there, take a peek at all of the customer reviews, my post is in there too: "Bitcore from High Point, NC")
It's a huge difference, the stock comp driver is a piece of trash. Not only is the selenium much beefier, I believe it handles more power, and it has a brass protective mesh on the throat of the driver that A: protects it from particulates too big to fit through that, and B: looks a tad bit sexy because it looks gold-ish
It's also a great idea to get some butyl rubber sound damping material and liberally apply it to the back of the horns. (AKA: Dynamat) Those horns are made from regular old plastic, and are very lightweight. If you hold them from a corner and tap them with a knuckle (w/ driver attached or not) - hear that resonance? That's extra harmonics and noise you don't want the speaker to be making, and since it's a horn making it and not just a vibrating panel of a box, it's going to be loud. You want that sucker to be as 'dead' as possible. I used damplifier on mine, I've read comparison reviews from all over the place of different deadening brands and this one wound up to be the best bang for your buck. I don't know if they do any business overseas out of USA, but either way, this is the sort of stuff you want to wrap the horns in a couple layers of: http://www.secondskinaudio.com/vibration-mat/damplifier.php If anything, just adding weight to it will lower it's natural resonant frequencies away from the passband of the comp driver - You'll notice a difference if you A/B a modded horn and a honky, non-modded one.
If you want some added kick-ass to this admittidly budget cab, buy a pair of speakon sockets, gut the crossover out of the box, cut a hole in the terminal cup, and convert your cabs to bi-amp like I have - Or wire it up for 2 pair speaker cable. Active x-over is the sh*t.
For about 120$, I made these cabs sound at least a thousand dollars better in my opinion.

The 15" driver JBL puts in these is inexpensive, very sensitive, and a decent all-round driver. I really like it and lots of people love it's bass response. Everyone knows the compression drivers suck: way too much sibilance and ringing, and they only respond up to 16K. (this is even stated in the manual and the cab. frequency response, not a problem for DJ's who only play MP3 music, but anything beyond that it's lacking)

I bet the stock comp driver would be quite a bit more responsible for hearing loss than if you replaced it with the D210 and ran it even louder...

Forget bullet tweeters man, just replace the comp driver that is the source of the problem and be done with it! It really is a screw-on replacement (you need to cut the stock fastons off the wires in the cab, but that's it)


Edited by bitcore - 08 September 2008 at 6:52pm