For those with the entune premium and are not satisfied with the sound from the factory head unit there is an inexpensive way to greatly improve the sound in the $200 price range. The factory speakers are sub par. I like the features of the system but was extremely disappointed with the quality of the sound output. I have an access cab and really did not want to add a sub in an already space limited truck. There were rave reviews about the Subaru Kicker tweeters that many had installed in the dash. They are plug and play and are less than a 30 minute install for a beginner. That alone would be a good improvement in clarity but still does not address the poor and muddy bass output of the factory door speakers. After reading through hundreds of speaker reviews I started shopping for Kicker CS series 6 x 9 (3 way) front and 6.5 (coaxial) rear door speakers. I purchased all 6 speakers, door mount adapters and wire adapters needed for the doors and the Subi tweeters. I installed the door speakers back in April and tweeters in July. I am still amazed at the improved clear and crisp sound that these speakers produce. I was fortunate and found my door speakers on clearance at bestbuy. I also had a $47 credit in ebay bucks for the tweeters. I can say that my system is so great now that there is no need for an amp or sub. The installation was less than 1.5 hours for all 6 speakers. I now have crystal clear highs and knee knocking bass that really brought the head unit to life. There is a complete speaker installation guide video at oemaudio.com that is good for any brand of speakers. I did not require any sound deadening material. Recently crutchfield has been offering buy one pair of Kickers and get the 2nd pair 1/2 price and they give you the door mount adapters and wiring adapters for free. If you make this change you will see that the head unit has great output and you will be shocked at how cheap the stock speakers are. There is no way you could ever get this quality sound with the stock speakers. My new speakers have 450 watts peak for the 6 x 9 and 300 watts peak for the 6.5 and they have 100 to 150 watts rms. This is hands down the best sound I ever had in over 40 vehicles considering I have no amp or sub. That includes a Bose stock system in my work commuter.