from source:  
“It’s nothing special… Just my bass cannon!  
Wub interlude  
So I had this thing built back in November of 2012… and for some reason I never uploaded it here! (It made its “debut” on Equestria Daily right after Season 3) Felt it was more a youtube thing than a dA thing. But here it is anyway!  
Imgur for some build photos: [link]  
Youtube for some wubage: [link] and some [link]
 

 
Quote: After about 3 weeks of work, I have built myself a replica bass cannon based from the flash epic wub time. It measures 20 inches on every dimension and is operated from a pioneer radio with CD/USB/Line-in. With 350 watts of total amplifier power- it drives four 4 inch speakers and a 12-inch subwoofer. Wouldn’t be complete without RGB lighting that tries to sync with the beat. And to count as a bass cannon it just had to be mobile so wheels and a battery was a must. Charges in an hour, plays max volume for an hour. Or keep plugged in for 24/7 wubs. (neighbors love it!)”
 
youtube