This is a very nice dumble voiced amp, only used at home. Can plug 4,8, 16 ohm. With Fx send/return and Footswitch. SLX upgrade means the 4 knobs can be pulled for more gain/voice. This amp is $2855 + SLX upgrade $695 = $3550 (21750 rmb) if you buy new in USA. Im selling it for 18000 rmb only.