So call me biased but I have always judged an amp by its size. If I see an amp that is rated for 3-4k and it only 15 to 18 inches long I pretty much think it will not actually put out that wattage. I saw a classified on here for a 4k actual wattage but it seems too small. Im sorry to the person that posted this but I am not trying to knock your amp just curious if I am going about it wrong. What do you guys think.