The 304's are the older model, so yes there has been several improvements made since then. The 306's are much tougher.
Are you just looking to get loud bass? The TS-W3004SPL's are supposed to pound prety good for the price. (I have not personally heard them to say for sure)
Are you just looking to get loud bass? The TS-W3004SPL's are supposed to pound prety good for the price. (I have not personally heard them to say for sure)
