Are the 52-5140 cards unobtainium?

[hjames]

Hmm, that could be it. In passive mode everything was connected like this: solid color - red terminal, color+black - black terminal.
Just as Kenrick sound advised and it sounded the best to my ears.

Should be an easy thing to test ... good luck!

[martin2395]

Well, the units are wired different now - much better but the Urei 5235 is a joke when compared to Ecler FAP 2.4 set to 300Hz/12dB.

Most surprising was that the Carver PT1800 sounded better than my Luxman M03, on all fronts.
We found out the QSC EX2500 to have the best bass, the Carver was close second and the Luxman didn't do much.
Sadly both 2235's have aftermarket recones are simply c...p and both need replacement - they differ in output and are unable to produce decent bass.