Not a big fan of those spring clips. Never saw more than 2 pair per gang and I very vaguely remember seeing maybe a two gang somewhere.
Best bet if you want to do this is to get the spring clips separately and make your own plate out of a large enough blank. Question is where to get them, I know I've seen those too someplace.
Another alternative is the bananna jack connectors. Leviton make bananna jack inserts for their Quick-Port plates and there is a 2 gang with 12 ports (6 speakers).
Bananna jacks require bananna plugs on the cable end but that's a good thing because at least they can be color coded and labeled. It's too easy for someone to mess up the connections with spring clips later on.
Actually I'm not a big fan of any of these termination methods because of the possibility of wrong connections and shorts due to the large exposed metallic parts of the bananna jacks.
I would much rather bring a bundle of cables out of a wall box or mud ring through a suitable wall plate with a bushed hole and run them directly to the equipment.
[This message has been edited by hbiss (edited 01-27-2005).]