Feanor is only echoing the sentiments of a lot of members here. I believe you have started a thread about this at AK under the name PrestonP. I know you will get a different response there. Most of those guys are more concerned with vintage than sound quality. There are quite a few people there who have Mach Ones and like them. I don't really understand that at all. Mach Ones, Cerwin Vega's and other "Frat House" speakers make lots of noise on a few watts. To my ears that's the only thing they have going for them. Contrary to Cerwin Vega's ad; Loud is not good no matter how clean it is when it doesn't sound like music.
A pair of AR's, Advents, KLH's or JBL's will walk all over those Mach Ones. The time and money you are going to sink into Mach Ones would be better spent on a pair of those I just mentioned.
It might be an ear opener for you to go somewhere and listen to some good gear. Doing that would give you an idea how good gear sounds. At the very least it would give you some kind of target to aim for sound quality wise. On a personal level, I don't like any speakers in a box but I'd take any of the ones I mentioned over Mach One's.

Save your money and buy some decent gear. It will sound better and you'll be more satisfied in the end. People that are satisfied with the sound of their system stop tweaking and play music. Most of the posters at AK change gear like I change socks. I have a post there that politely raises the question.

Could it be?
"People that are happy with the way their system sounds just play music. People that tweak and constantly swap speakers and other gear in and out are basically not satisfied with their systems."