I've had a GK 800 RB for a 5 or six years - Just picked up a 115 RBH for a bit less than 1/2 price. I thought I had done my research - GK's website specs say the RBH series cabs have cast frame speakers, BUT when I opened up the cabinet to clean it out and check the wiring, it's a stamped frame... What's up with that?? Anyone know? I haven't asked GK yet - just found out today. The serial number shows it was made in July of 2000 - did GK perhaps use stamped frames then? I have to say that it sounds great, but I'm prejudiced in favour of cast frame 15's - I've used D140 JBL's or 421-8H Altecs for 32 years -still have the Altecs - and I can't understand why a top line company would put stamped frame speakers in their top line cabinet. Maybe the speaker blew and the rental shop replaced it with a lower end speaker, but it doesn't look like the cab has been opened up before.