Search:

Even the cone is made from californian trees, a real 100%, not a 100% assembled in..

Dear Rob,

Thanks.
I still have the plan to translate what I did here in the past: https://www.jbl-vintage.com/t3066-filtre-actif-jbl-urei-5235 , that could be added later.
I have also a pair of...

Some information to help you in your card conversion:

xxBREQ cards are the followings:

51-5232 - 500 Hz/18 dB/octave CCBREQ
51-5233 - 800 Hz/18 dB/octave CCBREQ
51-5332 - 500 Hz/18 dB/octave...

When using LR24 for Low and High filtering, in bi-amp mode, supposing that you have one amp for LF and one amp for HF, you have to reverse the polarity either at the output either of the HF amplifier...

Input impedance variation is compensated by the resistor placed in parallel to the autotransformer input. With the apropriate resistor value, circuit input impedance will be the one of the resistor....

There are nice autotransformers from Germany ;-) on eBay.
I'll try to find the link. I had the opportunity to measure two of them, and they work well. You can use them directly with Compression...

Can someone at least confirm that the correct board reference for Paragon is M20?

Fostex r100 are autotransformer which is different from usual Lpads. Noble RPH25 is not available anymore, only on second hand market.
...

Otherwise you can search for Noble RPH25 (model used by TAD and Rey Audio) some of them used by Yamaha are 16ohm while the majority of them on second hand market are 8ohm.
I’ve two of them in stock...

8ohm when connected in parallel as in the provided schematic. Each pad of the r82b is 16ohm.
I’ve a pair of them and measured this some time ago. You can go ahead with them.

I'm searching for the technical information about the equalizer board for JBL SE408S amplifier, to drive JBL Paragon with active crossover. It seems that the reference for the board is M20, but I’m...

take the r82b, it is a dual 16 ohm, just use one of the channels

I'm also searching the schematic of those equalizer boards. The reference seems to be M20. If anyone has the schematic or even boards available Iwould be interested.

Hou can use Soniroll fiberglass, same as the one pos used that has similar density as the one used by JBL.
I got it from Point P shop where you can order it.

Appart that after March 29th shipping cost to you won’t be the same...

There is also a good address in France that could be able also to do the replacement, with no Customs fees for shipping...

Corrected, I wrote this without checking first. I added the link to the document.

I've tubes of 105mm diameter on my TAD 2402 clones, instead of 100mm accordingly to the plans. I've clone of exact dimensions for all the rest, especially the interna volume, and I used glasswool for...

Values are here: http://www.jbl-vintage.com/t3066p25-filtre-actif-jbl-urei-5235In the 12dB XXBREQ table values in red were calculated and could be different in real cards.

It was JBL UREI 5233 that was made for that, a kind of 5234 with half of the electronic
https://i.servimg.com/u/f38/18/83/38/22/523310.jpg

You can use two 5234, 5234A or 5235 populated with only...

52-5140 - For JBL 4340, 4343 et 4350
12dB with frequencies a bit more than 250Hz, ButterworthIf you don't succeed in getting a 5140 use the 250Hz card or any 12dB/oct 250Hz active crossover...

High Shelf 12dB I think, but 10dB is a high value, but aquaplast mades the diaphragm heavier, and then more horn roll of compensation is needed. Just set it up'and do a measurement to see if it is...

To continue help about from French guys :) hereafter is a vintage approach (whereas I own and use DSPs):

In my old thread in a French forum about JBL UREI 5235, I proposed an alternative to DX-1...

The 2231 have also been refoamed by an amateur.
as Ian is writing there are also nice clones with checked and renewed components. I know two sources in EU, Behringer Electric already mentionned but...

JBL 2450J on 2380A, 1m on axis measurement file: 81898


Phase correspond to impulse response shift to 0, which means that if using it as it is it will not reflect the delay between 2445 and...

81893

Remove ".txt" in the file name.