I got the woofers 418-8H II a year or so ago, not been using them...

wondering if they would perform well in a "typical," open back, guitar double 15" cabinet (with a tweeter or MF compression driver for above 7000Hz or so, if necessary

(i don't know. I don't play -- but have a friend that plays blues and some rock lately. I was planning on gifting them as soon as I build a good cabinet for the woofs)

They came to me in a pair of 816A boxes that are currently housing a pair of 515Bs

looking to house them in something more manageable....