I am a firm believer in the "you get what you pay for" mantra. I bought this cab 3 years ago. I power it with a GK 700RB head, using a Warwick Rock bass with active pickups. practice once a week play out 2 times a month. The sound quality of this cabinet has seriously declined in the past couple of months. I like that fat bottom sound that you can only get from a 15 or 18. I have poked around on the internet and found user reviews which state that the speaker in this cab is crap and the life span of the speaker is very suspect. I am wondering what a knowlegdeable person would do here. Would you recommend I replace this speaker? If so, with what? Or would you get a new cab GK115sbx or ampeg equivilent?