Hello, what you see here is a subwoofer rear plate for home use. Measuring in at 7 Lbs and for an opening of 6 3/4" by 7 5/8" this unit is new and never been used. I cannot find a brand name and the rear is stamped "Made in Taiwan" with the only identification being the material maker "CHI MEI" and the molder "FU CHENG PLASTIC CO. LTD." The controls include speaker inputs for bare wires or banana plugs, crossover network adjustments from 80Hz to 220Hz and level control. ON - OFF switch at the bottom plus a fuse input. See the printed sheet for instructions to connect to your speakers and the unit also has a 3.5mm female plug. Please email me with any questions before purchasing. 

PLEASE NOTE - - 

I HAVE RECEIVED AN EMAIL THAT NOTED THE FOLLOWING

"The specific model is the SWA-6, which is a 60W (RMS) Class AB subwoofer power amplifier module. These were commonly sold as surplus or "buy-out" items by All Electronics (a well-known electronic component distributor based in Van Nuys, California) before they transitioned to an online-only model and later closed their physical operations.Product Details Brand/Retailer: All Electronics Corp (often labeled simply with their "CAT#" on the paperwork). Model Number: SWA-6. Power Output: Typically rated at 60 Watts RMS into a 4-Ohm load. Features: This unit usually features high-level (speaker wire) inputs, an adjustable crossover frequency knob, and a volume/gain control.Technical TipSince the instructions are minimal, it’s worth noting that these "SWA" series amps were often manufactured by Sun-Way or Yung and white-labeled for hobbyist catalogs. If you are looking for more detailed wiring diagrams or troubleshooting, searching for "Yung SD series" or "Sun-Way subwoofer amp" may provide more comprehensive manuals for similar designs.