This is a great price for a studio subwoofer. It'll go well with your studio monitors, or just your regular speakers, or even your TV.
It won't give you sofa-shaking bass like a home theater subwoofer or doof-doof fully sik bass like a hotted up suby, but it'll give you tight, accurate, deeper bass for your music or whatever you're watching.
It has an 8" driver and has XLR, TRS (i.e. large headphone-style), and RCA inputs. There are also passthru outputs for you to connect it inline with your existing speakers.
More info here:
http://www.krksys.com/krk-subwoofers/8s.html
KRK released a newer model so I guess they're just clearing these out!
Configuration:Front Loaded, Vented Subwoofer
System type:Active Subwoofer
Low-Frequency:8" glass aramid composite woofer, 1.5" VC
Frequency Response: 35Hz-133Hz
Max Peak SPL:112.8 dB
Amplifier Class:Class D
Power Output:109 Watts Continuous @ 1% THD+N @ 46Hz
SNR (signal to Noise Ratio):92dB
Amplifier Distortion (THD+N): 0.1% @-3dB of Max Power Output 35Hz - 133Hz
Input Impedance (Ohms):9.4 kΩ Balanced or 9.2 unbalanced
Ground Lift:On / Off
Low Pass Frequency:30Hz to 205Hz
HPF bypass:with footswitch only
Footswitch:Optional
Phase:0 or 180 degrees
System Volume:-30dB to +6dB
Indicators:Power/Standby (rear indicator) and Sub On/Mute, HPF bypass (front indicator)
Input Connectors:
XLR Left/Right, 1/4" TRS Left/Right, RCA Left/Right, 1/4" footswitch
LFE input:N/A
Output Connectors:
XLR Left/Right, 1/4" TRS Left/Right, RCA Left/Right
AC Power Input: Selectable 110AV-240AC
Enclosure Construction: 15mm reinforced MDF
Finish: black vinyl wrap
Grille: Steel perf
Dimensions (H x W x D):13.3" (339mm) x 11.57" (294mm) x 14.25" (362mm)
Weight:26.01 Lbs. (11.8Kg.)
Great find OP! This one should sell out quick!