Thank you to all: my setup

[Dieter]

Hi to all!


Thank you for this forum and the help about reading all your posts!

Now I want to show you my DIY-JBL-Setup.

The components are:

2 JBL 2226H in separate 5cu-feet tuned to 40 Hz parallel
JBL 2360 Horn with JBL 2450 with JBL D8R2450SL
JBL 077

Crossover DIY (a little measurement and trail & error).

Electronics are:

Meracus Imago/Flagrare (CD)
ASR Emitter II (Amp)

Regards
Dieter

Sorry, i have problems to upload the pictures!

[Dieter]

The setup

[Dieter]

The crossover

[Dieter]

Frequenzy response in my room:

The micro drop at about 13000Hz and is not calibrated.

[Earl K]

Hi Dieter

Good Work !

What sort of paint did you use to get such a nice finish ?

I like your crossover. Are those a whole bunch of paralleled, "motor-run", small-value (uf), paper in oil types ?

regards <> Earl K :)

[Dieter]

here is the crossover-schematic:

[Dieter]

"What sort of paint did you use to get such a nice finish ?"

It is normal lac lacquered withe a role 3 times and sanded between lacquering

"Are those a whole bunch of paralleled, "motor-run", small-value (uf), paper in oil types ?"

Yes, those are paralleled paper-in-oil-typs in small values, the most are 1 uf, the biggest is 4 uF.

For the 077 the are bypass "glimmer" 2700 pF.

Dieter

[Earl K]

Hi Dieter

(a) In your picture you show 3 potentiometers doing various functions.

- What is the function of the 2nd (middle) one ? - The one that has all the wires coming and going from it . I can't find a pot. in your schematic that would require all those connections .

(b) Why did you decide to go with that approach for attenuation, ie. variable pots ( or rheostats ), strapped in parallel with the load - instead of the more traditional inline/series Lpad approach ?


thanks <> Earl K :)

[scott fitlin]

Excellent paint job!

[boputnam]

Hey, Dieter...

That is beautiful work! :yes: Those look professional finish - like something Audiobeer would do!

Question: Why is your horn mounted in that position, rather than horizontal? Are you hearing more L/R separation this way? :hmm:

[Niklas Nord]

very very nice Dieter!!
Looks really nice indeed!!!!!

;) ;) ;) ;)

[Ralf]

nice system

[Audiobeer]

Beautiful Job! Isn't laquer great! What did you rub it out with?

[Dieter]

"What is the function of the 2nd (middle) one ? - The one that has all the wires coming and going from it . I can't find a pot. in your schematic that would require all those connections ."

I will try to explain in my basic english:

from inductor-coil i can use six different values from 0 mH - 0,6 mH, to affect the frequency-resonse around 5000 Hz.


The big horn is laquered by professionels , i think it is not possible to laquer it by myself in such a quality.

"Question: Why is your horn mounted in that position, rather than horizontal? Are you hearing more L/R separation this way?"

It is angeled to my listening position on a couch.

here is picture in true colour:

[boputnam]

Originally posted by Dieter
"Question: Why is your horn mounted in that position, rather than horizontal? Are you hearing more L/R separation this way?"

It is angeled to my listening position on a couch. And, according to a pm I just got from Widget (hey Widget, your Inbox is crammed... ;) ), that horn was designed to be positioned with the throat vertical. :coolness:

[boputnam]

Originally posted by Dieter
from inductor-coil i can use six different values from 0 mH - 0,6 mH, to affect the frequency-resonse around 5000 Hz. Uh, oh... I think that's gonna get ol' Earl all excited with the possibilities...! :yes:

[Earl K]

Uh, oh... I think that's gonna get ol' Earl all excited with the possibilities...!
Well ,,,, I'm already reasearching the parts necessary to wind my own inductors. And, boy the price of Belden magnet wire has gone done a lot in these parts .

Don't get the wrong idea - I'm still commited to biamping or multiamping - I just figured it's time to learn to wind inductors ( for a winter project ) .

regards <> Earl K

[4343mod]

Dieter, your equipment is awe inspiring. I love your crossover; I can imagine how sweet it must be. Makes my stuff look like a Soviet AM crystal radio set. I'm drooling and busting a woodie over here. Very, very nice. Wish I could hear it.

Keep up the fantastic work! -Andy Bacon

[jbl]

Hi Dieter,
One Word. WOW!!!

[pangea]

Originally posted by Dieter
here is the crossover-schematic:

Hi Dieter!

Very nice speaker design, indeed!

But I have a question regarding your "crossover-schematic".
Is there really only one inductor in your x-over?


BR
Roland

[Dieter]

Hi Roland,

no there are many inductors in my crossover
for the bass 1,125 mH
for the mids there is a 2,5 mH coil, sorry in the schematic i called it Ohm,
the other coil here (sorry again i called it Ohm too) is 0 - 0,56 mH (from this inductor-coil i can use six different values from 0 mH - 0,56 mH, to affect the frequency-resonse around 5000 Hz.)
For the 077 there is (sorry again) a 0,16 mH coil.

Sorry for this confusion
Dieter

[pangea]

Originally posted by Dieter
Hi Roland,

no there are many inductors in my crossover
for the bass 1,125 mH
for the mids there is a 2,5 mH coil, sorry in the schematic i called it Ohm,
the other coil here (sorry again i called it Ohm too) is 0 - 0,56 mH (from this inductor-coil i can use six different values from 0 mH - 0,56 mH, to affect the frequency-resonse around 5000 Hz.)
For the 077 there is (sorry again) a 0,16 mH coil.

Sorry for this confusion
Dieter

Hi Dieter!

OK, no problem and thanks for clearing that out for me.
I notice that one of yor inductors (1,125 ) has a value down to the thousends of a Henry. Is that really necessary, or would the closest standard value do without affecting the tonal quality?

BR
Roland

[Dieter]

No, it isn't necessary, but i measured that value with a L-C-R-Meter. I think a 1,2 mH coil does the same.

Dieter

[Earl K]

Hi Dieter

(1) Which coil setting ( in mh ) did you use - when you measured your system response ( that you posted earlier ) ?

(2) Is that a single coil with multiple taps ?

Thanks <> Earl K :)

[Dieter]

Hi Earl K.,

the coil setting was - if i remember right - 0,1 mH.

Yes, it is a single coil with multiple taps.

BR

Dieter

PS: It looks similar like this coil

[Earl K]

Hi Dieter

Do you know what the resistance presently is ( in ohms, measured between the wipers ) of your 20 ohm rheostat - within the 2450/2360 horn portion of your network ?

( I'm trying to calculate what the attenuation is { in db } for that portion of your crossover circuit . )

Thanks <> Earl K

[Bernard Wolf]

Hi Dieter - nice job. Am curious though if you might have tried a CD lens on that to keep sound from reflecting back off the wall at you. I notice that a lot of these big systems end up by nature being very close to side walls. Good occasion for a CD lens ala the S/3100.

B