I have saved enough to grab a D800 head and one cab subway cab - a 112, 210 or 115. At the store they told me I would fry the speaker with only one cab. Is this correct? I thought that a head with 800 @ 4ohms and 400 @ 8 ohms would be fine with one 8 ohm cab with 300 watts (the 112) or 600 watts (the 210). My plan was to eventually get a second matching cab, but I thought I'd be fine with just one for now. This would be for practice, and occasional gigs. I've been using a Fender Rumble 100. I just did an outdoor gig with it, and it seemed to keep up with the drums and guitar pretty well. I just want to upgrade to something that sounds better and is a bit louder. Thanks for any advice!