New Yorkville XS400!! The XS400H 400 watt bass amplifier is the next leap forward in bass amplifier design from Yorkville Sound. The first major advance was to feature a Sovtek 12AX7A preamp tube at the input stage. Not content to stop there, we added a separate parallel tube overdrive circuit, and an innovative 'wet / dry' balance control that allows the player to set the perfect blend of overdriven signal to clean bass tone. In short you can add as much growl or as little tube warmth to your overall bass sound as you need, while maintaining a clean tone underneath it all to maintain definition and clarity. A switchable limiter and a compressor circuit with user definable threshold control has been added to the tube input circuit as well. An improved five-band EQ, with a semi-parametric mid control with a user definable frequency has taken the place of the graphic EQ Yorkville has used on higher power bass amps in the past. A new continuously variable Scoop control has been added to the XS400H to replace the 'Contour' switch used on Yorkville bass amps in the past as well. The Scoop function sweeps from a flat frequency response to a mid-frequency dip at 300 Hz. As you increase beyond the 1/2-way point on the control you begin to boost both the top end and bottom end to your tone, in addition to further reducing the midrange level. Other professional features added to the XS series bass amplifiers include a front panel wet / dry control for the effects return, footswitchable tube overdrive, footswitchable effects return and a pre / post selectable XLR balanced Tube DI output. Speakon and 1/4-inch extension speaker outputs have been added for the addition of an external bass cabinet, like our popular XC210, XC410, and XC115. A front panel tuner / mute switch has been added to the XS400H bass amplifier. This mute silences the signal to the amplifier (and DI output) for silent tuning. XS400H Features Tube powered input and overdrive (12AX7A preamp tube) Innovative Wet/Dry blend on Tube Overdrive Wet/Dry blend on the effects loop return Five band EQ featuring a semi-parametric sweepable mid Unique "Variable Contour" scoop function Footswitchable Tube Overdrive Footswitchable effects loop Pre/Post EQ selectable XLR balanced Tube DI output Speakon and 1/4" extension cabinet outputs Front panel mute switch for silent tuning Comes in head and combo form.