I have a Yorkville XM200 combo that I would like to add an extention cabinet to. It will put out 200w @ 4 ohms when the extention is attatched. One of the cabs I have looked at is rated to 150w @ 8 ohms, which might be cutting it a little close (no headroom, I'm assuming). The other can handle 600w @ 4 ohms, obviously no risk of damaging it here. My question is, is too much headroom a bad thing? And how close can I cut it? is the 150w cab a bad idea. Let me know what you think cause I am new to all this. Thanks!