JBL 4355 Replica

[berga12]

maybe 4343 or 4333

[berga12]

I'm always working slow....due to missing time...

Port are done, reinforced with fiberglass (2 layer) in the conjunction and just Resin around.

The fitting on the box is not like I was expecting, so I can't use Wood glue as there was already some paint....So I had to use another sintetic glue to compensate the minimal gap then use an Hot Glue gun on the back of the speakers between front panel and tube...

ok, strong enough....it works fine, I just have to forget and back to listening...

also the 2235h are re-foam by an expert repair shop in Italy called "Mausound" he did a great Job, in the next 2 days I'll finalize the speakers!

[Lee in Montreal]

The bead of glue around the domes is indeed pretty good looking. It shows the expertise of the technician.

[berga12]

I don't know if this was coming from an old refoaming or this one, but for sure I was not able to do something better.... so bere we are,I can't complain so much...

[ivica]

The bead of glue around the domes is indeed pretty good looking. It shows the expertise of the technician.

Hi Lee,
But the color of the foam and its size is something unexpected for me.
Interesting can be seen if T/S parameters would be measured, and compared to the JBL declared.

regards
ivica

[berga12]

I'll perform measurement and post them

[berga12]

Hi Lee,
But the color of the foam and its size is something unexpected for me.
Interesting can be seen if T/S parameters would be measured, and compared to the JBL declared.

regards
ivica

In the meantime that I'm performing few hours of suspension brake-up before measuring T&S parameters, what's looks strange ore unexpected for you? I compared my re-foam and suspension with many pictures of originals..........and I can't see the difference

dustcap and black glue is original, the technician did not remove the dustcap and center the cone with a low frequency tone.

two pictures with Flash and without Flash.......maybe the light was causing "coloring issue".




and a couple of example from Japan......I can't find any difference.
let see the measures.

[berga12]

So, I performed A first shot of measures but It seems that the cone itself was too "cold" (in the garage at -4°) so spider and suspension were still not at RT 20° so I got slightly different measurments.

Fs around 22hz, Qms around 3, QES and QTS around 0,3 , VAS a bit below the 460L and efficiency around 93db, Mms shows bigger than 155g

there must be and error due to temperature factor, and some breaking up time that need to make the suspension running for more than 50hours.

I place the cone in the box and I'll be running now 25hz for a couple of days and I'll dismount one cone for measurments later on.