Recently picked up a 6545 to compliment my Ghia. I use a stock Z Best, but also have a retro style 1x12 made by Zane's brother. I had been using a Greenback in the 1x12 mostly to try and keep the Ghia's volume under control at small gigs since it was less efficient than a V30. Now, I'd like to apply the same principle to a speaker than can handle the 60? or so watts of the 6545. Suggestions?