Originally Posted by Andoskyy
Oval speakers being sub-par is a myth. A good pair of 6x9s will be just as stiff and sound as good or better than a round speaker.
I'm not posting this to start an argument, there is lots of information out there on this topic. Google "round speaker myth" ... It's a very old school and disproved theory.
Simply, more surface area moves more air. With a quality 6x9, you'll be able to improve mid bass performance.
Their ability to handle the power, be stiff, etc is not what I was challenging. The shape of a sound wave and the crossing of sound waves is the concern. While a high quality 6x9 can still sound good, the same money spent on a 6.5" speaker will result in a better quality speaker with a more balanced sound wave production.
Regarding pushign more air, yes a 6x9 will have a wider surface area. However, the shape of the cone to allow for the cage, surround and extension, in addition to the size and type of magnet, play a much larger role in the sound and bass quality when there is a small difference between the amount of air actually moved and i default back to the quality for the money, you will get better materials/quality in a 6.5" speaker. Unless you are planning to push something below 150 Hz through these, you will not see a difference and that low would distort all of these options and should be reserved for 8" or larger subs.