JBL 4312 A in disguise

[jan_slagman]

Hello Friends,

Last Fridaynight surfing the internet i found a pair of DIY JBL's on Dutch Marketplace. They were remodelled and they looked ugly.
Yuck, light green ! But when studying the details i learned the owner had used JBL 4312 A components (2213H; 104H3 and 035Ti). I own a pair of JBL 4312 A's myself and i thought it could be useful to have some spareparts. I phoned the seller and after talking for a while he made me a nice price. The loudspeakers are pretty big for a JBL 4312 A combination.
They measure about H 48" x W 12" x D 16". Saturday i picked up the loudspeakers and when i was ready to leave the owner asked me to wait for a moment. He went into the house again and he came back with the book "The JBL Story" and he handed it to me as a present. At that moment i didn't know what i liked most, the book or the green monsters. I already informed my wife on forehand me taking home a pair of green ugly ducks. When i came home and took them into the house my wife was gobsmacked. She had never seen such horrible looking loudspeakers. Of course i was curious to learn how these speakers sounded and i connected them to my Harman Kardon 16a power amplifier and....wow......a tight, open and controlled sound filled my room. Telling my wife the other day i had plans to take out the components she said it would be a loss to demolish these green monsters.
Me being a faithful and loyal husband wouldn't dare to argue about the speakers' seize (lol)!!!!! :D
Now i will paint them in a nice black glossy colour and i will replace the iron grids for black speakerclothing.

With kind regards,

Jan Slagman a.k.a. JBL-freak
The Netherlands

[url=http://imageshack.us]http://img380.imageshack.us/img380/5585/diyjblwith4312componentnu2.jpg[/

[louped garouv]

looks like it was a fun project...

and will be nice sounding in your home...

[jan_slagman]

looks like it was a fun project...

and will be nice sounding in your home...

Yes,

It sounds o.k. but it doesn't match with my furniture at all and it looks like a flag on a mud-scow :offtopic:

But.............i will change that soon !!!

Jan

[louped garouv]

are you painting your walls and furniture green?

;)

[demon]

them speakers look fun, i hope you are having a good time with, and i am looking very much forward to read the new book you scanned page by page and sent to the forum.
uhhh..
about the colour, well, i think its safe to refere you to this link i found in a "may" thread.
http://www.handmadehifi.com/

go make em great!

cheers from vienna,
mikey

[jan_slagman]

them speakers look fun, i hope you are having a good time with, and i am looking very much forward to read the new book you scanned page by page and sent to the forum.
uhhh..
about the colour, well, i think its safe to refere you to this link i found in a "may" thread.
http://www.handmadehifi.com/

go make em great!

cheers from vienna,
mikey

Grüss Gott Demon aus Vienna,

Yes, that book is very interesting and it was offered by Harman Consumer Holland during their 2008 dealershow.
I will report the developments to this forum, like i did when restoring a 1966 JBL SA-600 amplifier.
Please have a look at:

http://www.hififorum.nl/index.php?topic=10420.msg162941#msg162941

With kind regards,

Jan Slagman
The Netherlands

[macaroonie]

Is this a trend ?

[hjames]

"I" prefer the woodie look ... that green just isn't fetching ...

[demon]

yes i see...but why do they all have the midrange and tweeters on the side?!!
:bs:


jan:
nice work on the amp -respect!!
i want one too, now.
:banghead:


cheers,
mikey

[jan_slagman]

Is this a trend ?

Hi Macaroonie,

Thanks a lot for the picture. It gave me some new ideas how to change a few details.

Kind regards,

Jan

[jan_slagman]

yes i see...but why do they all have the midrange and tweeters on the side?!!
:bs:


jan:
nice work on the amp -respect!!
i want one too, now.
:banghead:


cheers,
mikey

Hi Mikey,

Thanks, i really appreciate your compliments. Have a look at:

http://cgi.ebay.de/JBL-SA-600-Vollverstaerker-superselten_W0QQitemZ300215231514QQihZ020QQcategor yZ40162QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Hurry, hurry !!!

Greetz,

Jan

[demon]

thanks, ive seen it (of course!).
im already talking a friend into buying it -im not allowed to by another amp, and actually i want big speakers first. BIG -not tall (like your greens, ha..!).
how bout these?
http://cgi.ebay.at/2-Boxen-JBL-Monitor-Studio_W0QQitemZ140224576018QQihZ004QQcategoryZ220 03QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
going to be expensive i guess...
(sorry, thats off topic)


cheers,
mikey

[jan_slagman]

thanks, ive seen it (of course!).
im already talking a friend into buying it -im not allowed to by another amp, and actually i want big speakers first. BIG -not tall (like your greens, ha..!).
how bout these?
http://cgi.ebay.at/2-Boxen-JBL-Monitor-Studio_W0QQitemZ140224576018QQihZ004QQcategoryZ220 03QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
going to be expensive i guess...
(sorry, thats off topic)


cheers,
mikey

Hi Mikey,

Go and get them before you feel sorry !!!

Kind regards,

Jan

[jan_slagman]

http://img404.imageshack.us/img404/5922/brotherscl5.jpg (http://imageshack.us)


Quiete a a difference isn,t it ?

Have fun,

Jan

[hjames]

thanks, ive seen it (of course!).
im already talking a friend into buying it -im not allowed to by another amp, and actually i want big speakers first. BIG -not tall (like your greens, ha..!).
how bout these?
http://cgi.ebay.at/2-Boxen-JBL-Monitor-Studio_W0QQitemZ140224576018QQihZ004QQcategoryZ220 03QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
going to be expensive i guess...
(sorry, thats off topic)


cheers,
mikey

Hey - thats a good start in ze big boxen - look like JBL 4320s - probably 4505 cabinets, plus drivers and crossovers!! Its even got the grills (The ones I got in Feb 2006 didn't (http://audioheritage.org/vbulletin/showthread.php?t=9796&page=5))...

[Fangio]

http://cgi.ebay.de/JBL-SA-600-Vollverstaerker-superselten_W0QQitemZ300215231514QQihZ020QQcategor yZ40162QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Would advise to rather stay away from this seller. A very rude guy on several occasions, never got confidence-building answers, and his photos are always way too good to be true.. Photoshop is amazing isn't it. About 260 negatives tell the whole story.. :cool:

Hey Jan, what's the internal volume of these enclosures – are the ports tuned to that full size?

[demon]

Just for fun !!!

and youre right, it is!



Would advise to rather stay away from this seller. A very rude guy on several occasions, never got confidence-building answers, and his photos are always way too good to be true.. Photoshop is amazing isn't it. About 260 negatives tell the whole story..

oh yeah thats true, the community isnt very pleased with him.
[i once asked a question about an amp for my infinity kappa8 (for sale now), they go down to 1,6 ohm, and he answered: all of my amps can handle them!
haha!]


i will try to meet the seller of ze big boxen, would really like to listen a bit.
:bouncy:

mikey

[jan_slagman]

Would advise to rather stay away from this seller. A very rude guy on several occasions, never got confidence-building answers, and his photos are always way too good to be true.. Photoshop is amazing isn't it. About 260 negatives tell the whole story.. :cool:

Hey Jan, what's the internal volume of these enclosures – are the ports tuned to that full size?

Hi Fangio,

Unfortunately i can't tell you anything about the loudspeakers interior at this moment.
I first have to remove the bassloudspeaker to have a look inside.
The outer measurements are about H 48" x W 12" x D 16". The enclosures are made of MDF. The seller told me the enclosures interior had been consolidated. According to sellers story an electric engineer should have built these creations.

Kind regards,

Jan Slagman
The Netherlands

[jan_slagman]

Hey Jan, what's the internal volume of these enclosures – are the ports tuned to that full size?

Hi Fangio,

Removing one of the woofers i learned the loudspeakers had been internally divided in two compartments. The lower compartments with the original volume and the ports tuned to that size. The upper compartments just to create the looks of a big loudspeaker.
The midranges and tweeters were placed in the upper compartments. I made a square hole at the backside of one of the upper compartments (the side opposite the woofer) and now i can put the crossover in that compartment too. I will remove the midranges and tweeters from their place and i will replace them in line with the woofers. There's one asset too, the woofers have been built in some 16" above the floor so i don't need stands and will place the midranges and on "ear-level" now. I only have to close the holes where the midranges and tweeters were placed before and i do intend to paint the enclosures in a glossy black piano paint with massive wooden details.

Kind regards,

Jan Slagman
The Netherlands

[demon]

I only have to close the holes where the midranges and tweeters were placed before and i do intend to paint the enclosures in a glossy black piano paint with massive wooden details.

those will look cool for sure.
how do you plain to arrange the mid and tweeter?

mikey

[jan_slagman]

those will look cool for sure.
how do you plain to arrange the mid and tweeter?

mikey


Grüss Gott Mikey,

Wie geht es dir ? Mikey i don't quiete understand your question regarding the mid and tweeter. I will place these units in the upper compartments right above the woofers.

Kind regards,

Jan Slagman
The Netherlands

[demon]

hey jan!

"danke ich bin fein"
(as my dictionary would say)

:)

my question was:
will it be a vertical line array, or tweeter/mid side by side.
do you think it matters?

cheers,
mikey

[jan_slagman]

hey jan!

"danke ich bin fein"
(as my dictionary would say)

:)

my question was:
will it be a vertical line array, or tweeter/mid side by side.
do you think it matters?

cheers,
mikey

Hi Mikey,

It will be a vertical line array. In my opinion JBL placed them side by side to achieve manageable measurements for their Control Monitors.
F.i. the JBL L80T and the JBL L100T are using the same mid/high combo in a vertical line array.

With kind regards,

Jan Slagman
The Netherlands