Hi there. Anyone here owns this amp before? I have recently purchased this amp 2nd hand and it sounds really good in the highs and mid range, but however, the bass is somewhat lean sounding. Fortunately(or unfortunately), this amp doesn't have any tone controls and I can't really get much satisfaction from listening to dance music using this amp. Hence, is there any kind souls who can provide me some advice on how to improve on the bass of this amp? Thanks in advance.