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yggdrasil
12-20-2004, 04:00 PM
Thought I'd like to share my JBL DIY with you all.

It consists of 2215 woofers, 2202 lower mid-range, LE85 upper mid-range, 077 UHF.

I constructed and built the crossover with attenuators for the 3 upper elements. Crossover frequencies 230Hz, 1200Hz and 7000Hz. 12db.

The 2202 have a small closed box. The 2215 have the rest of the box, which is quite large. 55 x 55cm footprint. 125cm high. The baffle is tilted 5cm back. The bass reflex is tuned as low as i could. I don't have proper measuring equipment to say the frequency response within +-3db. With frequency generator you can hear them playing down to 18Hz before the big silence.http://audioheritage.org/vbulletin/images/smilies/biggrin.gif

To drive this I use Norwegian Pre and power amplifier from Doxa. I have Pioneer pd-s06 CD-player. Between the pre and power amplifier I have two mono Techincs equalizers.

2pair
12-20-2004, 04:05 PM
:rockon2:
Bee-yoo-tifull!

Steve Gonzales
12-20-2004, 04:17 PM
VERY nice !:) I can also foresee the next generation of JBL forumites in those pictures too!

scott fitlin
12-20-2004, 04:20 PM
Cute kid on top of the speaker too!

Nice speakers, well done!

:cool:

Ken Pachkowsky
12-20-2004, 05:35 PM
Good job and a fine looking system.

Ken

Mr. Widget
12-20-2004, 05:55 PM
Nice,:) Thanks for sharing!


Widget

transducergeek
12-20-2004, 07:16 PM
Thought I'd like to share my JBL DIY with you all.

It consists of 2215 woofers, 2202 lower mid-range, LE85 upper mid-range, 077 UHF.

I constructed and built the crossover with attenuators for the 3 upper elements. Crossover frequencies 230Hz, 1200Hz and 7000Hz. 12db.

The 2202 have a small closed box. The 2215 have the rest of the box, which is quite large. 55 x 55cm footprint. 125cm high. The baffle is tilted 5cm back. The bass reflex is tuned as low as i could. I don't have proper measuring equipment to say the frequency response within +-3db. With frequency generator you can hear them playing down to 18Hz before the big silence.http://audioheritage.org/vbulletin/images/smilies/biggrin.gif

To drive this I use Norwegian Pre and power amplifier from Doxa. I have Pioneer pd-s06 CD-player. Between the pre and power amplifier I have two mono Techincs equalizers.

Wow! Nice units! And cute kids... Did you use "NORWEGIAN WOOD" for the cabinets? Is'nt it good, norwegian wood....

Poor humor from a fellow Scandihoovian... I call myself a NorSwedgian... 3/4 norge.. 1/4 swede.... 100% "squarehead"! .. although a native born/raised Los Angeles, Californian... HOME OF JBL! Now your reference to Yggdrasil ? That is a word I heard in the 60's from Jefferson Airplane's bass player Jack Cassady who called his bass guitar the "YGGDRASIL BASS" Is that a wood? I think it is... MMM...

Rolf Erickson...

Alex Lancaster
12-20-2004, 09:00 PM
:) GGGreat!, when You have a chance, get rid of the LE15s, and try some 2235H's.

Wardsweb
12-20-2004, 09:33 PM
Very nice indeed ! Do you have a wood working shop, do all this yourself, did you veneer to the edges or cut on a 45, etc...

yggdrasil
12-21-2004, 01:30 AM
Very nice indeed ! Do you have a wood working shop, do all this yourself, did you veneer to the edges or cut on a 45, etc...
I veneered to the end. Done after final assembly. Used books to apply pressure. Did the paint job before veneering.

I have a small wood working shop in our basement. Done all myself. I did not have the wood working shop when this project was realized, but it is in use on my latest project.

S.O.Stefansson
12-21-2004, 01:33 AM
(or make that 1/2 Norwegian, 1/2 Icelandic ;))

Great work (flott arbeid)! :bouncy:

Nice to see more JBL enthusiasts around Norway, I'm based in Bergen.

On the Yggdrasil note, this was a big ash tree in Nordic mythology, growing its root into hell with branches stretching into heaven. Many animals lived in this tree, and the tree connected all the nine worlds of the old Nordic mythology.
:cheers:
Best wishes,

Sigurd

jtgyn
12-22-2004, 04:28 AM
G'Day Johnny,
Very nice job indeed.
May I ask what sort of glue you used for the veneer and do you have details on the crossover?

Thanks & Regards Scott

Niklas Nord
12-22-2004, 04:50 AM
Yggdrasil,
do you like the 2202, I have several of them.
they are a great midrange indeed !!

yggdrasil
12-22-2004, 12:25 PM
Yggdrasil,
do you like the 2202, I have several of them.
they are a great midrange indeed !!
I think the 2202's are great. What they do in the lower mid-rang / upper bass-range is unbelievable.

Very well detailed, playing beautifully and lots of reserves when needed.

I'm working on a project with an altec 411b 15" woofer, a 806 on a 811b horn. Have done the first testing and have come to several conclusions, one of them beeing that there is a large kind of void in the area 300-700Hz. This void is not there when running tests on a microphone, but it is quite present when playing music.

Other conclusions are that I will have to build a new crossover, the 20-30 years old altec gives the HF driver a hard sound. And I will have to put in an ultra high frequency driver (2402/2405).

yggdrasil
12-22-2004, 12:48 PM
G'Day Johnny,
Very nice job indeed.
May I ask what sort of glue you used for the veneer and do you have details on the crossover?

Thanks & Regards Scott
This is a tough one because I am not sure of the english words for this glue. I'll try with many words....

On this project I used traditional wood-glue. This glue is quite wet, so one of the large side panels on each speaker have bumps. Both front and top is ok.

I read an article about veneering some time ago where the writer recommended contact glue (i.e. the same type of glue used when changing the foam on a woofer, that yellow stuff).

He also said that one should use an iron on low heat to iron out small air bulbs.

Working on a new project and hope to come to veneering by the end of january.

The crossovers are second order, 12 db/octave, with attenuators for the three upper drivers. I built the crossovers on the same dimension materials as the main boxes.

I cut out a rectangular hole at the back, and made an equally large hole in another board and mounted this inside the cabinet. Then I made a smaller hole in a third board and mounted this inside this again. On the first board I built the crossover. The crossover is just put in place and screwed. It is a perfect fit and service friendly. This way the attenuators does not stick out. The lower hole takes the crossover, the upper is a service hole for the HF and UHF drivers.

The digital version of the calculations and drawings have been lost, but I still have the printouts, so if you like I can scan them in a few days.

yggdrasil
12-22-2004, 12:50 PM
:) GGGreat!, when You have a chance, get rid of the LE15s, and try some 2235H's.
Alex you will have to excuse my ignorance, but what is the difference between the 2215 and the 2235?

Alex Lancaster
12-22-2004, 01:54 PM
:) Johnny:


They are very different, IMO the 2235 is modern, more efficient, and goes down lower, the construction, although they may look similar is another thing:

LE15 = deep plate gap, less power handling, non-vented magnet, it is a 1940s design.

But, as always, whatever sounds good.

Mr. Widget
06-04-2005, 05:39 PM
Hey Johnny,

I noticed your new avatar... did that fat cat eat your son? :D

57BELAIRE
06-04-2005, 06:56 PM
Hey Johnny,

I noticed your new avatar... did that fat cat eat your son? :D

Great one Widget! :applaud:

And from one Norseman to another....beautiful job!

I can see you're upholding the storied legacy of Scandinavian woodworking (books).... I've used bags of sand....whatever works brother!

Anyway, great post and to Sigurd Stefansson....thanks for that little gem!

rbh

yggdrasil
06-05-2005, 04:45 PM
Hey Johnny,

I noticed your new avatar... did that fat cat eat your son? :D

Oh no. He has grown far too much since that picture. Would have to be a much fatter cat.

Will have to make a new avatar. Had to make a crude incorporation of the smith horns in order to keep house peace.

yggdrasil
03-26-2006, 12:10 PM
Have been upgrading the speaker a little.

First I took out the crossovers, going external. This is a preparation action before building charge coupled networks.

Then I mounted the new Smiths. The 077's were moved a while back when the Smith prototypes were put in.

Third I cut just a little larger hole in the baffle to fit my newly acquired 2245's. Before installing the 2245's I also added more internal bracing. Could probably still do with more bracing, but that won't be with these boxes at all.

northwood
03-26-2006, 12:14 PM
:applaud:

hjames
03-26-2006, 01:17 PM
Have been upgrading the speaker a little.

First I took out the crossovers, going external. This is a preparation action before building charge coupled networks.


Tell me a bit about running your crossovers external - I' m currently running a set on top of my boxes (3 ways) but it means the back isn't fully sealed due to the wires running in and out. Then again, I've only got one set of terminals mounted to the back - if I was to mount 3 sets of terminals - one pair for each driver, I could dink with the circuits whenever I wanted and still have sealed cabinets. Tho I've still got the LE15s ...

yggdrasil
03-26-2006, 03:54 PM
Cabinet back is sealed. 4 sets of terminals.

JBL 4645
07-15-2010, 07:37 PM
Hey Johnny,
http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=8132&stc=1&d=1117928373
I noticed your new avatar... did that fat cat eat your son? :D

Johnny

I do how ever approve of the black cat on the JBL:p. Ive seen some other JBL publishing pictures that uses a black cat in the archive pictures.

spkrman57
07-16-2010, 10:38 AM
Thanks for sharing it with us!

Regards, Ron

yggdrasil
07-17-2010, 06:07 AM
Thank you Ron.

The speakers are simply amazing, but will still be replaced sometime during the fall/winter. I have most of the parts and ideas, but still a long way to go.

Here's a little teaser...

The design goal with the new speaker system is to make it easy to change drivers / horns / crossover frequencies / crossovers slopes and respons shaping.

It will start life as a 3 way. The woofers in separate ported 10 cuft cabinets. Mid-bass with DIY horns and HF with DIY horns. I have 2245 woofers, TAD TM1201 mid-bass and 476Be HF.

I have designed a modular active crossover and started etching PCB's.

Robh3606
07-17-2010, 07:08 AM
Hello Johnny

Can't wait to see what you come up with! I like your present speakers just fine.

Rob:)