So i have upgraded the Shaker 500 Head unit to a Kenwood and was very impressed with the purchase after I tuned it to my liking. The sound quality was very good for stock. it does get loud and clear but My question was is im not very thrilled on the idea of upgrading the amp but I was wondering if anyone has an idea on the benefit of upgrading the door and rear speakers. If anyone has what brand would be a good sound or if the sound has changed at all? im looking to see if i could get a louder clearer sound with just replacing speakers. the reason why i am not wanting to change the amp is for money reasons.