Beryllium diaphragm for JBL 2425
Is anyone aware of beryllium diaphragm for JBL 2425 1" I looked for it at Truextent and apparently the only make such diaphragms for bigger diameters speakers.
I understand that replacing the stock Aluminium diaphragm with a beryllium one will make a very significant difference.
Awaiting opinions.
Hybrid crossovers a big no no
Hello boys and girls,
This post is a heads-up and is written as a result of six months of extended testings and listening sessions, soldering and changing cables and modifying boxes and frustrations.
The story starts around March 2016 when I wanted to use a JBL 2123 in a 4343 configuration namely 2235 for bass, 2425J for HF and 2405 for UHF. Given this combination I was told to use a combination of filters. namely the 2123 section from 4344mkII and HF and UHF from Giskard schematics. I did just that. The result was a dull and veiled sound. Of course I refused to think that the crossovers are causing this and I started to investigate other potential causes. Cables, Lpads, Star grounding, boxes posts, type of wires, caps, resistors... and the list may go on and on. All this time my guide and guru was Mr. Ian McKenzie AKA the Doctor who tutored me and to whom I want to thank again for his patience and dedication resisted heroically to my avalanche of frustrations and tried to help little ol' me.
At some point he said he had enough of this and took the road of recreating my hybrid filters and compared them with a pair of pure and simple 4344MKII. The result was.... THERE IS NO COMPARISON. The sound of the hybrid is light years away from the sound of a HIFI system.
SO IF YOU THINK YOU WANT A HYBRID CROSSOVER, THINK AGAIN. OR OTHERWISE PUT DON'T DO IT. IT WILL ONLY FRUSTRATE YOU.
you may find here the result of his research http://www.audioheritage.org/vbullet...l=1#post399476
Your brother in DiY,
Bogdan