JBL 4425 Questions : JBL 2416H vs. RAdian 1225-8
Hi,
i'm a german newbie here :) and since last week i own a very nice pair of JBL 4425.
The speakers are in very good condition and the woofers are refoamed and measured (with data sheet) by a german professional:
http://behringer-electric.de/
He didn't recone because of the very good condition of the original Woofers.
My 4425 came from a studio-basement only stored for custom replacing-requirement,so they are like NOS !
Now i read about the replacing Radian 1225-8 drivers with aluminium diaphragm and Mylar surrounding.(cost 99€ + Back Plate)
The original JBL 2416H is titanium dome with diamond surrounding structur...
Ok there is no need for a replace ,but some people said the Radians are more "refined" sounding and have less distortion because of lower mass.
Somebody compared ???
Cheers
notengewirr
2 Attachment(s)
Radians are well-made alternatives
The Radian diaphragms hold the promise of a smoother sound quality with the inherently better resonance-damping qualities of aluminum as compared to Ti, and the Mylar surrounds on the Radian avoids aluminum surrounds' inherent weakness of work-hardening from high-output flexing which led to cracking and diaphragm failure - the reason JBL switched from Al to Ti as a diaphragm material in the '70's.
I just bought a pair of Radian 1225-8 for use in JBL 2426 drivers. I will be using them on 2344A horns, A/B comparing them directly against another pair of 2426 drivers and 2344A horns in my main home system with 2012H 10" mids in a small box atop JBL 4507 cabinets loaded with JBL 2035H or 2226H 15" woofers.
The pair of 2426 drivers with Radian diaphragms were recently tested and tweaked at a fellow LHS member's "lab" with his TEF analyzer system and newly-completed Plane Wave Tube. The Radian diaphragm F.R. sweeps compare very favorably to my best performing factory Ti 8 ohm diaphragm on another JBL 2426 (actually a 2425HS on a threaded adaptor for 2426=2426).
White: JBL Ti D8R2425
Yellow: Radian 1225-8
Magenta: Radian 1225-8
Attachment 54079
He did a little tweaking on one of the Radian-equipped drivers and got rid of that dip in the 5.5K to 7KHz area, but he hasn't had time to work on the other one yet.
One of my JBL drivers came from ebay with an aftermarket Ti diaphragm (probably chinese Mfg.)
Just to show what "cheap crap" gets you, he swept it on his PWT/TEF setup, and even after tweaking for over an hour, the best FR graph was deplorable!
White: JBL Ti D8R2425 (same as in above graph)
Yellow: Aftermaket Ti (likely Chinese knock-off) Positive marked with 1/4" round red sticker marked +
Attachment 54080
I need to come up with one more diaphragm for the project, but can't decide if I should get another JBL Ti diaphragm for stereo comparison listening, or another Radian for a L-C-R Home Theater setup, which is the end goal of the project...
I will start a thread on the project and the listening tests when I get the drivers back and start on the project after the New Year.
Quote:
Originally Posted by
notengewirr
Hi,
i'm a german newbie here :) and since last week i own a very nice pair of JBL 4425.
The speakers are in very good condition and the woofers are refoamed and measured (with data sheet) by a german professional:
http://behringer-electric.de/
He didn't recone because of the very good condition of the original Woofers.
My 4425 came from a studio-basement only stored for custom replacing-requirement,so they are like NOS !
Now i read about the replacing Radian 1225-8 drivers with aluminium diaphragm and Mylar surrounding.(cost 99€ + Back Plate)
The original JBL 2416H is titanium dome with diamond surrounding structur...
Ok there is no need for a replace ,but some people said the Radians are more "refined" sounding and have less distortion because of lower mass.
Somebody compared ???
Cheers
notengewirr