I was tired of listening to the crackling and popping of my original Becker 4x6 speakers so I decided to replace them with an upgrade. I've always like Boston Acoustic so I purchased the rear 5 1/4 and the front 4x6. I knew there would be some modifying to the 4x6's but nothing too serious. Wrong. The size might read 4 x 6 on the box, but I learned the base on the speaker surround was slightly larger and deeper and would not fit properly in the hole. (Not even after I took the Dremel to it.) I hate mixing and matching components, but I found some Polk plates that were made of ABS for easy modification if need be. The Polk's sound great and fit perfect. Any body need a random Boston 4 x 6? (The other looks like Frankenstein.)