2010+ Audio System Build-Up Stages

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2012 MAZDA3 i Touring 5-Door SKYACTIV-G
Disclaimer: My car’s audio system is stock. All information listed below is from reading the posts on mazdas247.com.


To be continued...
Comments and suggestions are welcome!

Stage I
(Skill - Moderate; Tools - Basic; Price - <$500; Reversible - Fully)

Auxiliary kits
Positives: Plug directly into stock Head Unit (HU); retain full use of steering wheel controls and heads-up display; allow charging of device
Negatives: None

GTA Car Kit for Mazda3 2010+ (iPod, 3.5mm)

GROM USB Android iPod iPhone adapter for Mazda3 2010+ (iPod, 3.5mm, USB, Bluetooth)

Speakers
Positives: Better sound
Negatives: None

Front speakers: 6 x 8 component (<=150 watts for stock HU) with separate tweeters (tweeter replacement strongly recommended)

Rear speakers: 6 x 8 non-component (<=150 watts for stock HU); arguable gains from replacement of rear speakers - see post for more details

Speaker adaptors: available to accommodate speakers with the following sizes: 5, 5 1/4, 5x7, 6 1/2, & 6x9. Do your research! The adapter you need depends highly on the speakers you choose. Size is the obvious characteristic but do consider mounting depth (may need spacers with some speakers) and quality of adapter material (stronger speakers may disturb the bracket and distort the sound at higher volumes).

Stage II
(Skill - Advanced; Tools - Full toolbox + Power tools; Price - <$1,000; Reversible - For the most part)

Stage III
(Skill - Expert; Tools - Special tools; Price - Sky is the limit; Reversible - Probably not)

About me and my car:

I got my 2012 MAZDA3 i Touring 5-Door SKYACTIV-G non-BOSE (long name) in May 2012. The car has a few minor flaws that I can happily live with but one glaring shortcoming is the sound quality of its audio system.

The sound coming out of the stock speakers is inconsistent, unfocused, and lacks definition between highs, mids, and lows. I am by no means an audiophile and only occasionally listen to very loud music but still find the sound quality much below par.

My experience with car audio is from installing a few HUs, speakers, amps, and subs to my and my friends cars - not much but probably more than most.
 
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Have you used the GROM USB adapter? Interested in anything you can tell me about it.
I have a 2012 M3iT with the standard radio, have been playing my MP3s with an Archos
pocket player into the aux port, but would rather be able to plug in a thumb drive,
see file info on radio display (big enough to actually read), etc.
 
I recommend you Google it and see all of the specs on the manufacturer's website.

I have not used any of the above components. In fact, my stereo is completely stock.
Part of the reason I wrote this post is to document my research so that others could benefit from the information I am able to gather and eventually use the info to do a little upgrade myself.
 
Yeah, been there, downloaded the pdfs, etc, but there's no substitute for hands-on and chatting with someone who has done might be the next best thing. Anyone actually used a GROM USB care to chime in?
 
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