Just purchased a Eden WTX 500 head for my gigs around town and I have a few questions I hope some of you can help me with....1st off, I used it last night with a 8 ohm cabinet (process of purchasing a 4 ohm cabinet) and when I pulled the mid boost eccentric knob out to engage it made a loud pop (sounded like a paddle hitting a ping pong ball at a high pitch) and it happened every time I pulled it out and did so even when I cut the volume down on the gain knob.....I called Eden and the tech there said that was normal which was a little weird to say the least..He commented I needed to pull it out before I cut the amp on....Thats absurd....I have WT800 I use on my larger gigs that stays on the truck and I haven't had any problems with it except the fan quit working once....2nd..I am looking for a 4 ohm cabinet, any suggestions...Looking at a 2/12 Aguilar or the TC Electronic 2/12 4 ohm in my opinion as far as durability and sound...Thanks ...