D 123 Recones

[Audiophil GmbH]

Hello members of this forum,

we need 2 original JBL recones D 123 8 Ohms. Harman Germany can deliver them only in 5-6 months. Where can we get these recones?

greetings from Munich,

Harald Woita -Audiophil GmbH-

[Guido]

Be careful about the "narrow gap" problematic!

If those D123 have a gold top plate there is a 50% Chance that you can't repair them. Also a C8RE110 should fit. Could one of the reconers please confirm this?

[edgewound]

Be careful about the "narrow gap" problematic!

If those D123 have a gold top plate there is a 50% Chance that you can't repair them. Also a C8RE110 should fit. Could one of the reconers please confirm this?

The C8RE110 won't fit as it's a 10" and the D123 is a 12". You're correct about the possible narrow gap. The gap would have to be machined out to the current gap size.

[GordonW]

You should be able to use a non-ferrous (ie, brass or plastic) "feeler guage" set and determine the gap guage. IIRC, the narrow-gap ones are less than .040" (1mm) between the plate and the pole piece; if you have at least this much clearance (can't remember, but it should be either .044", .048", .053" or .057"), you should be able to get it reconed properly. Should be a good ballpark.

Now, I have been able to "hand-fit" aftermarket parts, and recone the narrow-gap drivers. But, with the tight gap, it's a royal PITA, and I wouldn't recommend it to anyone unless they have the proverbial patience of Job...

Regards,
Gordon.

[Guido]

The C8RE110 won't fit as it's a 10" and the D123 is a 12".

C8RE120 if it's an 12"

Yeah, right! 10.2 inch CONE dia. My mistake

[Guido]

Why you audiophile guys from munich don't stop here more often?

Tell us a bit what you're doing with JBL's.

[Audiophil GmbH]

Hi Guido,

thank you for the informations. We "guys from Munich" are a loudspeaker manufacturer here in Germany. We also make speaker repairs and tuning of high end loudspeakers. JBL is my passion since more than 25 years.
Recently we have almost finished a project for a home cinema system with 10! speakers consisting of JBL 123A1 (new recones)/ Scan Speak D 9900 Revelator, crossed over at 1500 Hz with 24 dB, which is linear +- 2dB.
This speaker has a great sound projection, perfect for home cinema. The subwoofers will be two 2242 H with 400W RMS. When we have finished the project, I will send some photos.
For a new project we want to combine a D 123 wth Fostex T925A, crossed over at app. 5 KHz. The frames we want to use are from 123A1, which should have the right gap dimensions and induction for beeing reconed with D123 recones. This loudspeaker should perform well with SE tube amps 8-15 Watts or a 300B push pull amp 30 Watts, we have manufactured 5 years ago.

Thank you again, until the next time,

Harald Woita -Audiophil GmbH Munich-

[edgewound]

C8RE120 if it's an 12"

Yeah, right! 10.2 inch CONE dia. My mistake

Sorry Guido , but the C8RE120 has a 4" voice coil, where as the D123 has a 3" voice coil, and would be reconed with a C8R2125 or I believe a C8R2212 would fit(123A-1 equivalent)

[kurt Elliott]

Hi guys,

Related to the d 123, anyone knows what kind of selant is this sticky one used on the 123A (L100´s)cloth surround? JBL´s customer service says that it is no longer available.
i´ve been looking for it for a quite long time with no results.

Is it a glue? a Sealant? or???

Well, any information will be appreciated!

Kurt From Santiago, Chile.

[Audiophil GmbH]

Hi Kurt,
I have the damping compound used for cloth surrounds. It is called Airflex, and you can get it from EVI-Audio in Germany ( EV-Service ), Part-No. 450 249-97346. I have used it already on several 123 A-surrounds and for Tannoy 3808 Dual Concertrics, and it works well.

... greetings from Munich,

Harald -Audiophil GmbH-

[GordonW]

Be aware- the D123 cone is much lighter (less mass) than the 123A cone (ie, C8R2122). No Aquaplas on the D123. As a result, it's about 2-3 dB more efficient, but at the expense of not having the same bottom end extension.

Also, the D123 has only about a 1/2" voice coil winding length, as opposed to the just over 3/4" winding length of the 123A. Again, it's more about high-efficiency, as opposed to low bass response...

The C8R2125, as mentioned above, is correct... spec'd for the D123.

Regards,
Gordon.

[kurt Elliott]

Vielen dank Harald!!,

Hast du die EVI-Audio kontakt adresse?? (Web page, link??)

I´ve been looking for it, but i can`t find the product on the site.

thank´s again!!


Kurt

Hi Kurt,
I have the damping compound used for cloth surrounds. It is called Airflex, and you can get it from EVI-Audio in Germany ( EV-Service ), Part-No. 450 249-97346. I have used it already on several 123 A-surrounds and for Tannoy 3808 Dual Concertrics, and it works well.

... greetings from Munich,

Harald -Audiophil GmbH-

[Audiophil GmbH]

Hi Kurt,

EVI-Audio is the german Electro Voice-Service. You can look on: http://www.electrovoice.com to get this damping compound ( Airflex ).

Best wishes,

Harald