Yamaha YST-SW315 Powered Subwoofer - Tested & Working

Yamaha YST-SW315 Powered Subwoofer - Tested & Working 
Recently obtained from an estate sale featuring high end music gear.
Unit is tested and working. No issues to report. 
In good condition. See photos for more details.
Some specs at the bottom of this listing
Listing is for Yamaha YST-SW315 Powered Subwoofer as pictured only. No other accessories included. 
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ADVANCED ACTIVE SERVO TECHNOLOGY

Yamaha's Advanced Active Servo Technology is a complementary amplifier/speaker system utilizing negative impedance feedback in the amp and a Helmholtz resonator in the speaker to provide strong and accurate bass.

10-INCH DRIVER AND 250 WATT PWM AMPLIFIER*

High amplifier power assures enough power to deliver shattering movie theater-like bass effects, and the down firing 10-inch long stroke cone driver translates the power into clear bass sound. The PWM digital drive amplifier is extremely efficient and stable. The YST-SW315 has a frequency range of 20 to 160 Hz.

BASS SELECTOR

Yamaha's BASS (Bass Action Selector Switch) tailors the sub's output for video or music at the touch of a switch.

YAMAHA QD-Bass TECHNOLOGY

A Yamaha technology that uses a down firing driver to radiate the bass output more efficiently. Sound is radiated in all directions for greater impact.

MAGNETIC SHIELDING

The subwoofer is magnetically shielded so it can be placed near a TV monitor or receiver without degrading the picture.

CONTINUOUSLY VARIABLE HIGH-CUT FILTER

The user adjustable continuously variable high-cut filter sets the highest frequency the subwoofer will deliver. It can be set anywhere from 40 to 140 Hz. For instance, if the filter is set at 75 Hz, only frequencies 75 Hz or below will be delivered by the subwoofer. This allows the sub's output to be matched to the other speakers in the system and the room's acoustics for a seamless presentation.

VOLUME CONTROL

The volume control permits the perfect matching of the sub's output to the overall volume of the system.

SIGNAL SENSING ON/OFF

For convenience, the YST-SW315 has a signal sensing circuit.When the subwoofer detects an audio signal, it turns its power on. When it senses no signal for several minutes, it shuts itself off.

PHASE NORMAL/REVERSE SWITCH

Makes it easy to phase the subwoofer with the other speakers in your system.

DUAL INPUTS

Two sets of inputs allow the versatile subwoofer to accept either line level or speaker level input signals.

HEAVY-DUTY SPEAKER TERMINALS

Yamaha's three-way speaker terminals accept banana plug and a variety of other connectors, as well as speaker wire.

BLACK ASH FINISH

Handsome black ash finish blends in with room decor and complements many furnishing styles.

RIGID CABINET CONSTRUCTION

The YST-SW315's cabinet is constructed of thick MDF to increase rigidity and reduce vibration and resonance.