Keeping with the theme that a high performance, tech savvy, state of the art electric car needs a great audio system, I'm looking for suggestions on high impact mods to Tesla's HD audio package. Background: I ordered my 2014 D with the Ultra High Fidelity audio system. I then added the Reus Systems upgrade that included upgraded A pillar speakers, tiny speaker in front of the mirror and two subs in the rear cargo area including high fidelity crossovers and amps. The result was dramatically improved mid and high treble response in the front and a bone rattling bass in the rear for (mostly recent) songs that were mixed to include subwoofers. I've adjusted the settings to slightly boast the bass and treble and slightly pull down the mid-range with the built-in equalizer. All of my testing is done from a flash drive that has either high quality AAC files or (mostly) flac files ripped directly from the CD. Lately, I've started to add HD flac from HD Tracks or Pono Music World with even "better than CD" tracks. Some remastered but all with more bits. (The mastered tracks always sound better than the standard CD tracks to my ears.) The overall results are improved but: - The sound stage is biased to the front with little coming from the rear when sitting in the drivers seat. - Bass response is great if the song was mixed for really low end subs (less than 75 hz- just a guess). Otherwise, there is no kick... - Many older songs (think Grateful Dead, Beatles, Allman Brothers, any 60's to mid-70's songs) lack in the bottom end and sound a little muddled in the mid-range. - I'm like a larger sound stage (balanced between front and rear) but my car sounds like it only has front speakers with a little support from the rear. The exception to this is if the song has a strong, low bass line which thens makes the audio sound more spatially balanced. Goals: - Improve the mid-range response with a more crisp, defined sound. - Widen the sound stage by boasting the rear speakers for mid and high sounds. - Reduce mid-range muddle. - Improve the punch of older songs that don't really kick the dual rear 10" subs. Any thoughts, real world experience or suggestions are appreciated. (Also, any shops in the Washington, DC area that could help with this!) Best!