Blue vs Black (4343 vs 4435)

[John Nebel]

Originally posted by boputnam

Tell us what the crossover set-ups are, and pre-amps and such. I don't remember your rack exactly.

Hi Bo,

It's really simple - Mac pre-amp with balanced line outputs, inline pads before the 4435s' crossover to match levels to the 4343s, JBL 5235 crossovers, in-line transformers on the output to take care of the long run parallel to AC lines with SCR switching transients.

(It could all do quite a job on your hearing if turned loose.)

John

[boputnam]

Originally posted by John Nebel
...in-line transformers on the output...

Hey, John...

Something like those Aphex 124A...? Knowing your perspective, I'm guessing it's something much higher-up the food chain...

[John Nebel]

Originally posted by boputnam
Hey, John...

Something like those Aphex 124A...?

Bo,

www.sescom.com

John

[Ken Pachkowsky]

John

God bless you!

My wife thinks your more insane than I am!!!

Nice system!

[Ian Mackenzie]

Nice John.

Ian

[John Nebel]

Originally posted by boputnam
obviously gone through a mid-life crisis - or two - since I was last there!

Bo,

Only two in months and months? If there is only one crisis in a week, it's considered



John

[Ian Mackenzie]

Well,

Had a very nice time in Boulder.

But Bo those Maks are really nice amps, not sterile like Joe was saying...........

Anyways, we had a good listen to the 4343/4430, its a tough call, if playing mostly classical stuff the 4430 are more mellow, but for jazz etc the 4343 are a cool system.

John's new LR32 are real nice, and appear to capture the best of both worlds.

Ian

[boputnam]

Originally posted by Ian Mackenzie
John's new LR32 are real nice, and appear to capture the best of both worlds.

:shock: You mean the LSR32...? John!! You, sir have a problem (not much different from mine on pro audio... )

[John Nebel]

Originally posted by boputnam
:shock: You mean the LSR32...?

Bo,

Nice specs. Ordered LSR32 and JBL actually shipped 6332. Didn't have time to hook them up until last night. Judging from a brief listen, JBL hasn't been asleep.

John

[boputnam]

Interesting, 4th-order (24 dB/octave) Linkwitz-Riley filters...

[4313B]

Yep. And I'd love to measure the DCR's on the chokes...

Drew wan't blowing smoke when he suggested them for HT instead of his older designs using the "big stuff".

[Ian Mackenzie]

John,

I am curious to know how the evaluation is progressing?

Speaking of hifi Rob and I did the Stereophile show in NY by the way.

Rob's setup standard setup pretty well smoked everything we saw and heard at the show although I did like the Joseph Audio demo using the Manley tube amps. But $$.

Interestingly they had the speakers position on a diagonal to the corners of the room, perhaps that made a real diffference.

Rob explained he has spent some months setting up and positioning his 2344a horns for just the right angle and position from the side walls, then carefully Equalising each channel.

In the sweet spot Robs sound stage was the best I've heard with the 2344a horn, the integration with the 2123h and E145 was perfect. Actually its the best balance in a diy JBL system l've heard to date. Perhaps Rob can elaborate.

Why JBL never did a commercial offering of the twin 2235, a 2123H and the 2344a/ 2426 combo is odd, the 2123H with that horn combo is just peaches and cream for me.

It will be interesting to gain Rob's impressions of his 4344 project
when its up and going.


Ian

[John Nebel]

Originally posted by Ian Mackenzie

I am curious to know how the evaluation is progressing?

Ian,

No dramatic experiments or changes - I've just been listening to music. Do tend to favor the 4435s.

Quite enjoyed your visit.

The big project has been convincing the EVA that is should stop failing loop 1A and it has behaved itself for a whole week now.

John

[John Nebel]

Originally posted by Giskard
And I'd love to measure the DCR's on the chokes...

Measured with the crossover disconnected from the system - three sets of readings: (1) ancient, but accurate Simpson VOM, (2) Fluke DVM, (3) repeat Simpson. No components removed from PCB.

ohms

L1 .30 .30 .30
L2 .33 .35 .35
L3 .30 .30 .30
L4 .30 .31 .30
L5 .14 .14 .15
L6 .25 .25 .25
L7 .25 .27 .27

John

[Robh3606]

''In the sweet spot Robs sound stage was the best I've heard with the 2344a horn, the integration with the 2123h and E145 was perfect. Actually its the best balance in a diy JBL system l've heard to date. Perhaps Rob can elaborate."

Wow! You my friend are too kind! I am glad you liked them. I have just been plugging away for a while with placement, EQ and driver choices. I cheat. I use my XPL'S as a reference and play them against each other. For a while I liked the main set-up beter but since a chat with Giskard about the volume for the 115H-1 and putting in 2214's they really shine now. I like the big boxes but the XPL's are one hell of a reference to have and are still the ultimate image champs. I should have the 4344's up and running in about 2 weeks I still have to get an adaptor from JBL and get a 2416 rediaphramed. Thanks on the crossovers. Without them it would have put things back a bit. Looking forward to giving them a go.

Rob