Manufacturer unknown - Woofer box (homemade box)

This is a woofer box from an unknown manufacturer. The box appears to be homemade. Box dimensions: approximately 41.5cm wide x 30cm deep x 10cm high. There are scratches and dirt from use. The felt parts are noticeably frayed. There are also scratches on the box itself. The woofer's output is unknown. Simple sound testing is OK, but there is a slight resonance from the box. Please check the condition before purchasing.