Please note: This listing includes 2 amplifiers as shown. I am selling as is, and will be happy to answer your questions. Each measures 12 in x 9 in x 3.5 in. Condition: Both power on as you can see in the two photos. Both are clean, in very nice condition as shown in the photo. I am selling the record collection and audio equipment from the private residence of a lifelong record enthusiast. Now in his later years, he has decided at last to sell his collection. He took care and joy in maintaining his record collection and always used hi-quality equipment. You get the exact items in the photos. I personally handled them as little as possible. Please check my feedback for reliability. Will ship safely (as always). *This item does include shipping insurance.

Yung SD300 300W Class D Subwoofer Plate Amplifier Module No Boost Product Details Yung Internationals SD Series Class D subwoofer power amplifiers are equipped with the unique ability to operate continuously at full rated output—a performance attribute not shared by most home audio amp designs. The benefits of this remarkable reserve capacity include solid, punchy dynamic range and fewer nuisance shutdowns when operated at sustained high levels. The amplifiers are also extremely compact, lightweight, and cool-running, allowing users to enjoy the advantages of compact system form factors and flexibility of placement. An internal peak limiting circuit prevents amplifier overload, and protection against internal and external faults is also provided. Input power requirements are user configurable to either 115 VAC or 230 VAC line voltage. Room optimization and system integration are accomplished easily, thanks to the SD Series amps inclusion of fully variable level, crossover frequency, and phase controls. Signal input is connected via dual RCA-type jacks, including the means to accept the output of an A/V receivers LFE output, and dual RCA jacks are also provided to facilitate line level loop-through. The amplifier also accepts high (or speaker) level input signals through binding post terminals. When in standby mode, the amps full active operation is engaged by signal presence of less than 1/2 watt. Specifications: Measured power output: 300 watts RMS into 4 ohms @ 90 dB Input sensitivity (@ low level): 210 mV/50 Hz Input sensitivity (@ high level): 3.0V/50 Hz Low pass adjustment: 40 Hz to 200 Hz Phase adjustment: Continuously variable from 0º (normal) to 180º (reverse) Power requirements: Switchable, 115/230 VAC, 50/60 Hz Dimensions: 10 W x 7-3/8 H x 2-1/2 D; Cutout dimensions: 9-1/4 W x 6-5/8 H.