Hi,
Last month I purchased this sub here from a dealer to compliment my salk silk monitors.
Decided to go w/ full range /floor speakers instead and selling this sub and my beloved Salk silk monitors. ( I also have my salk silk monitors for sale on US Audiomart $2350)
This is a mint Sumiko S.9 Subwoofer 10" ($1200 value)with WTX Transmitter/Receiver. ($299 value) 2 10" woofers(one passive/one active); 350 watt amplifier
New, only taken out of the box for photos. 
A huge discount for a subwoofer that can operate wireless, with extreme definition and musicality that is superior to other subs costing twice the price.

Please see all the excellent reviews:
https://hometheaterhifi.com/reviews/speaker/subwoofers/sumiko-s-9-subwoofer-review/

TECHNICAL
Specification

Type
Passive Radiator, front-firing passive radiator, down-firing active woofer

Woofer
1 x 260mm (10")
very long throw

Amplifier 
350W rms, 700 peak

Active Drive Unit
10in., 260 mm long-throw, steel chassis 

Lower Frequency Response
25 Hz at -3 dB 

Input Connectors
Hi Level Neutrik Speakon, Lo Level single phono, LFE phono 

Phase Switch
Yes, 0 or 180 degrees 

Amplifier Type
Class AB 

Dimensions (WxHxD)
14x15.9x16.2 in
355x405x411 mm
Including feet 
Thanks for considering
Much Peace & Happy Listening,
ken