I have that amp and it is not 200 watts. It is about 120 to 140 watts. It does not reach 200 until you are at 2 ohms. The internal speaker is 4 ohms. Here are the specs from the Yorkville site:
Type Combo Bass Amplifier
Cabinet Impedance (Ohms) 4
Power @ min. impedance (Watts) 200
Minimum Impedance (Ohms) 2
Burst Power - 2 cycle 250
Speaker Configuration - LF (Size / Power) Single 15 inch
Speaker Configuration - HF (Size / Power) Piezo Tweeter
Hum and Noise (dB) -90 dB Unweighted / -94dB Weighted
Input Channels 1
Channel 1 - inputs 1/4 inch phono jack
Channel 1 - controls Volume, Bass, Lo-mid, Hi-mid, Treble, Contour
Channel 1 - switches Limiter, DI out pre/post EQ
Input Sensitivity (mV) 25
Line Out (type / configuration) XLR pre or post EQ
Line Out Sensitivity (Vrms) 1.0
Effects Loop / Location Yes / Front
LED Indicators Power
Protection Thermal / Short Circuit
Limiter / Switchable Yes
External speaker output / location Yes / Rear
Headphone Jack Yes
Other Features XC115X Single 15 inch Extension cabinet is ideal mate for XC200 / XC200T
Dimensions (DWH, inches) 14 x 21 x 23.5
Dimensions (DWH, cm) 37 x 54 x 60
Weight (lbs / kg) 60.6 / 27.5
I have played out with this amp and struggle at times to be heard. I usually have the volume at about 7 or 8 which leaves me almost maxed out. I have not tried it with an extension cab but more speakers might make a difference. If you play with a light hitting drummer and mellow guitarist you should be fine but if they play with any intensity you will be in trouble. And do not play with the scoop activated. It kills your mids and you will not be heard.