Okay, I'll be brief. I've been playing for... 8 years and I'm still learning about what works and doesn't work concerning amplification. I would really appreciate all thoughts concerning this new issue I'm having. Recently I purchased a Markbass New York 121 cabnet as a light weight alternative to accompany my Carvin BX500. (The combination sounds amazing, by the way! Dumb Luck.) Here's the ONLY issue. The Amp produces 300 Watts at 8 ohms. The Cab TAKES 400 watts at 8 ohms. Perfect combo right? Maybe not... I've noticed that with level eq, no drive or contour, and the compressor at 10 o'clock the combination sounds amazing and produces a hefty amount of volume (very clean). As I dial the volume to around "6" or beyond, the tweeter distorts occasionally (sounds like a chirp or a rattle; like a metal tool box in the back of a pick-up). Well the good news is I can turn off the tweeter, but I also notice that slightly higher volume levels than that and the 12 inch speaker begins to ever so slightly distort on attack (I'm assuming due to peaks). Here is what I know: 1) Peaks are causing the problems from playing too hard... of course this isn't the problem as the volume reaches "10"... it's just standard. 2) The compressor helps limit the peak volume... of course I don't want to squash my beautiful tone too much if I don't have to. 3) Tweeters are easily distorted if the amp is clipping... and the amp might very well be clipping. 4) Amp clipping is pretty serious if prolonged, and something I want to avoid all together. Here are a few questions: 1) Is it possible that my amp is clipping with a flat eq and a bit of compression at the level of "6"? This would bum me out as the "purest" side of me would like to believe that I could turn the knob to "10" and have everything be okay (provided I'm switched to passive pick ups and no eq boost). 2) Is there any way to measure (perhaps with an electronic gauge) how much power is being sent to the speakers? I ask this so that I might be able to measure out the tollerances and know how high I can set my levels. 3) As power increases beyond what I consider typical (300 Watts and beyond) is distortion a normal part of pushing a speaker hard? I also have a full stack I play BX 500 through and even then the 18' speaker seems to take on a slightly distorted sound at "higher" volume. (18' speaker is rated to 600 watts) 4) What are some things I can do to maximize my power (without adding additional speakers)? I ask this because this markbass cab was purchased to be lightweight and portable and I'd like to keep it that way. 5) Do similarly powered amplifiers have different clipping tolerances? All thoughts regarding any or all of my concerns would be really appreciated. Any one who has experience with Markbass equipment is also welcome to comment if I have a bad speaker or not. I still have 20 days to return it. Thank in advance!