Picked this up in trade , Larger sized cab with a 12 speaker cab and tweeter , plus 18-1/4 x3-1/2 slot for power amp or whatever . Sent signal to to speaker and they make sound , the 12 inch speaker is just a no name vocal type speaker , what is cool about this is cab is you can use it tilted back or straight up , or a vocal monitor , our bass player was going to use it for a speaker cab for the small stages we play on , but changed his mind . Also this is bigger than your normal monitor speaker cabs   20 inches height and 20 across ,and 17 front to  back , Heavy . pretty versatile cab for different stage applications please se all pics ask all questions  LOCAL PICKUP SUGGESTED,  I am in San Diego CA as you can see shipping is costly for large heavy items ,