Magnums in box tuned to 29hz

Magnums in box tuned to 29hz
K

Magnums in box tuned to 29hz

it is the prototype model and dindt come with one,yea he was kinda stuck getting it since they were all sold out at the time and this one was for sale on ebay.
but may i ask what those marks are on the surounds of the mags?
 
sorry for not responding to the first post, and thanks for replying for me. But those marks on the surround came from when i had everything in my garage and my mom decided to sit the Black magic tire spray on my box. Well, it fell and it dripped on it. So its just extra clean
 
Top