This link goes to the official VEGAS Pro website at vegascreativesoftware.com

Cerwin Vega At-40 Specs 2021 Official

High efficiency, generally around 95–102 dB (1W/1m), allowing them to play very loudly even with low-wattage amplifiers. Impedance: 6 to 8 Ohms nominal.

Bass reflex (ported) design with a woodgrain vinyl finish. cerwin vega at-40 specs