I have a set of these ADS 346cs and a set of mb 216 qsd in the same car...
I had these up front and wired to the front channel of a jl 450/4 (2x150)
and I have the QSD in back wired to the rear channel of the amp (2x75)
And the Mb quarts still dwarf these speakers...everyone that sits in my car can hear the difference right away..
"Are the rear speakers cleaner than the fronts?"
Since then I switched them around and the car sounds a lot better.
The ADS 346cs are ADS top of the line and are nice speakers, but for the price tag about 699 new or about 150-350 new from
ebay seller...
MbQ QSD are worth the extra cost over these about 1100 new or about 325-400 new from an
ebay seller.
The tweets on the mbq are way cleaner and the woofer hits much more solid and louder.
Not to take away from your purchase...These speakers are great up front on their own with some basic rear speakers to compliment them...
Both my speakers sets are before both companies been bought out...so i have no opinion on the new maxxsonics MBQ QSD line and no opinion on the Directd line of ADS...