With the 3A sig you get the 5's tweeter and extended bass as Narrod stated. Later if you wish you can get a pair of 2Wq's and will have the equal (?) of the cloth Quatro. I have the 3A sig's and the 2Wq's (pair) 80-85 % of the 5's (?), for sound, money and the ability to add to the system the 3A sig's are a great buy, and they are very good by themselves if you can't add sub's.
