Whats With The....?

[#2121313]

Whats with the 4 grooves on top of most of these old Mesa combo's?

Like seen here: http://cgi.ebay.com/1981-MESA-BOOGIE-MARK-IIB-II-B-GUITAR-AMP-SIMULCLASS_W0QQitemZ120289516206QQihZ002QQcategoryZ10171QQssPageNameZWDVWQQrdZ1QQcmdZViewItem#ebayphotohosting

I can understand if they were on top of a cab (so your head would kinda lodge into) but why on the combo? What would fit into those grooves, if anything?

Just curious...thanks.

 

[GIG4FUN]

Whats with the 4 grooves on top of most of these old Mesa combo's?

Like seen here: http://cgi.ebay.com/1981-MESA-BOOGIE-MARK-IIB-II-B-GUITAR-AMP-SIMULCLASS_W0QQitemZ120289516206QQihZ002QQcategoryZ10171QQssPageNameZWDVWQQrdZ1QQcmdZViewItem#ebayphotohosting

I can understand if they were on top of a cab (so your head would kinda lodge into) but why on the combo? What would fit into those grooves, if anything?

Just curious...thanks.

that is the sus-4 (a SPECIAL suspended methog of) holding the chassis in the box with it hanging in rubber. It's a nice isolating method of hanging it in the wood...