Ashdown EB 12-180 EVO II 180W 1×12 Bass Combo Amps for sale on eBay The Electric Blue EVO II 1×12 Bass Combo uses a 180-watt RMS fan-cooled fast-transient power stage. It features a fully-featured bass preamplifier with inputs for both active and passive instruments, an illuminated VU meter; 5-band EQ with Bright and Deep switches;