mucklestone

The TF 115 doesn't have the door tweeters or the rear speakers in the T bar as standard like the 135 or 160.

Adding the tweeters and rear speakers is a cheap improvement for a lot less than decent aftermarket speakers. This also raises the sound stage for a much clearer and brighter sound.

Obviously aftermarket speakers are ultimately better, but the standard speakers are not that bad with a decent head unit.