Yamaha YST-SW012 Active Powered 8 Subwoofer 100 Watts Unit sounds great. There are some scratches/scuffs and an overspray of white paint on all sides of the cabinet (see pics). It does not affect performance. Measures approximately 11 1/4 x 11 1/2 x 12 1/2 and weighs 18 lbs 12 oz.

Yamaha YST-SW105 Active Subwoofer (powered, 100 Watt) with Servo Technology. Not to be confused with typical, average subwoofers!!! The YST stands for Yamaha Servo Technology. A servo translates mechanical energy (physical motion) into an electrical value. In this case, the speaker cone motion is monitored, and the servo adjusts the amplifier’s output accordingly, preventing excessive motion, or too little. The result is output that perfectly matches the input signal -no distortion or boominess. Just very tight, musical bass. Servo technology is a feature normally found on only very expensive subs like Velodyne. To get it in a sub-$100 subwoofer is incredible. Nice small size, but for small to average rooms or music studios, this thing has plenty of power

GREETINGS EVERYONE!.....YOURE CURRENTLY LOOKING AT VINTAGE YAMAHA ACTIVE SERVO PROCESSING SUBWOOFER SYSTEMMODEL NUMBER IS YST-SW100NICE WORKING CONDITIONOFFERING THIS VINTAGE SUBWOOFER WITH A LOW START BID AND NO RESERVE....SIMLY HIGH HAND TAKES THE JACKPOT!WINNING BIDDER TO PAY $40.00 SHIPPINGMIDWEST TO WEST COAST WINNER TO PAY $45.00 DUE TO DISTANCE FROM PENNSYLVANIAINTERNATIONAL,ALASKA,HAWAII,OR PUERTO RICO WINNER WILL BE NOTIFIED OF SHIPPING COSTPICKUP VERY WELCOMEINSURANCE AND TRACKING INCLUDED IN SHIPPING COSTPAYMENT TO BE MADE WITH PAY PALALL CREDIT CARDS ACCEPTEDOTHER FORMS OF PAYMENTS ACCEPTED EXCEPT PERSONAL CHECKS PLEASE INQUIREANY QUESTIONS FEEL FREE TO ASK!BID WITH CONFIDENCE!!IF ANY PROBLEMS OCCUR CONTACT ME BEFORE LEAVING FEEDBACK.....IF NOT CONTACTED AFTER THREE DAYS OF DELIVERY ALL SALES WILL BE FINALTHANKS FOR CHECKING OUT MY AUCTION AND GOOD LUCK TO ALL!