Martin Logan Grotto servo-controlled subwoofer

Up for sale is A Martin Logan Grotto servo-controlled subwoofer.  
Original owner, the subwoofer will come with power cord and owner manual, NO Original factory box.

Condition is close to 9/10, put 8/10 just to be safe and is 100% working condition, No issue.

Asking for $599.00 plus shipping.  New retail cost $1250.00

Payment prefer US postal money order or Paypal paying with " Friend and Family option"..(No fees).

Bank's certified check or bank's money order, unit will not ship until funds have cleared my bank account..(About 7 business days) After deposited.

Photos are of the actual subwoofer for sale.

Compact and Accurate

Grotto combines explosive bass power with servo-controlled accuracy and precision in a surprisingly compact cabinet at a perhaps even more surprisingly affordable price. At its core are the same high-resolution 10-inch aluminum-cone driver used in the flagship Descent subwoofer and a proprietary advanced-design amplifier. Easy to set up and sporting an attractive contemporary look, Grotto integrates comfortably into any room and system.

Frequency Response

22–150 Hz ±3dB; Anechoic through LFE effects input

Low Pass Filter Frequency

30, 35, 45, 55, 65, 80 Hz

High Pass Filter Frequency

70 Hz

Low Frequency Transducer

10" (25.4cm) high excursion, aluminum element woofer with extended throw drive assembly, non-resonance asymmetrical chamber format

Amplifier

250 watts rms (350 watts peak)

Impedance

RCA Line Level In: 20,000 Ohms. Compatible with 4, 6, or 8 Ohm rated amplifiers.

Audio Controls

25Hz Level Control: ±12dB
Power: Auto/On/Standby

Inputs

RCA line level; RCA LFE; speaker level

Weight

55 lbs. 

Dimensions

15.4" × 15" × 12.9"
(39.1cm × 38.1cm × 32.8cm)