Altec 604D which Cabinet

[HeathKitPat]

Hi all, I have a question for my learned colleagues.. Currently I'm using a nice matched pair of Altec 604C speakers in matching 606 Corner Cabinets (great combination).. taking advantage of my Mc C20's center channel capability I found a very nice EV Royal (this is just like a 15" version of the Aristocrat and I've been trying to find a second one, good luck). It's currently housing a TRX15 EV speaker.. It just doesn't sound right in the middle of the Altecs.. I just don't think the timing is right and it doesn't project the sound stage the same way as the 604. I find that the system sounds better with the center channel off. Not being one to give up I found a beautiful early model 604D. This is the first generation that uses the same cone as the 604. It even has two sets of numbers stamped on the cone. The newer 604D number and behind one of the ribs you can see a nice clean stamping of the 604C cone number. So this speaker should be almost identical in sound to the 604C...

NOW here is the question. I recently picked up an EV Regency Cabinet as well as the Royal. They are both massive 15" cabinets. The royal is the folded horn design (Klipsch) and the Regency Looks like it has bass ports and is a folded horn design also.. I'm not really familiar with these cabinets.

Does anyone have an idea which cabinet might be better suited for the 604D? I have seen many of the Regency and Empires for sale with 604's in them so I have to assume it was common back in the day to do this. I just wonder which cabinet would be best for the Altec. I'm going to keep the better one and put the TRX15 in the other and sell it off.

Thanks for any and all input..

Pat