Hello everyone. I am a new member and I have a question about my my amp(s). I have a GK 700RBII and A Hartke HA 3500 amp head that I play through an Ampeg 410 or SWR a Workingpro 15 speaker cabinet (depending on the gig). I'm trying to figure out why my bass sounds distorted in the lower frequencies when I use either amp head with the SWR speaker cabinet. I figured it is either not matched power wise or ohm wise, or my amp settings are not correct. On the GK 700, I'm not sure about the balance of volume, gain, boost, etc. And on the Hartke, the combination of Graphic, tube and solid state gain, low boost/high boost etc. is also hard to balance. What should be my starting point? Oh, yeah, the main basses I use are a Warwick 6 sting thumb bass and a Fender Jazz 5 string,which gives me the most problem with low end balance.