i have the inifinty kappas (6x8) 572.3cf's and they work great.. they also have a 6x9 modle too.. i got these 6x8's for 80$ the list price is like 160$ eheh so dont ever trust the list price... seriously go look around.. if you still need help just hollar
Crutchfield prices are retail.
Who pays retail?
It is MB Quart not "Quartz".
JL Audio and Quart make multiple lines of product. Some inexpensive some not.
What kind of car are you needing speakers for?
What kind of door are you putting a 6x9 in?