Thanks for the tips. Finally completed my amp/sub install for my Mazda6 but could be applied to the CX-5 too. I had a $130 Amazon gift card so I put it to use.
Goals:
Sound- Use existing Bose system but add more bass. Not overwhelming heart pounding bass but bass to compliment the music. Musical bass that can thump but no need to overpower the music. Goal met.
Budget- After Amazon gift card, under $120 out of my pocket. Goal not met. Spent about $200 out of pocket.
Install- DIY. Goal not met.
Install Shop- Have Amp, amp remote dial, and LOC installed at local reputable car shop for around $150. Mono Amp installed under driver seat. LOC installed atop the stock Bose amp cover plate located under front passenger seat. They charged $95. Goal met.
Sub- Wanted a lightweight easy to move sub and not take up much trunk space. Currently on rear right passenger foot well and fits like a glove. Blends in with carpet and hard to tell its there from looking through the window. Will experiment with trunk placement. Goal met.
Amp- Small class D mono amp with 250-300RMS and remote control dial under $100. Goal met.
LOC- Just work and for $10. Goal met.
Wiring- True 8 gauge from reputable vendor under $40. Goal met.
This is how the sub sounds (in someone else's car).
https://www.youtube.com/watch?v=v0QqU6MnQSE
This is the sub in the trunk of a Mazda3.
http://i.imgur.com/9sL4ZB2l.jpg
Amp purchased:
https://www.amazon.com/dp/ (commissions earned)
Sub Purchased:
https://www.amazon.com/dp/ (commissions earned)
LOC puchased:
https://www.amazon.com/dp/ (commissions earned)
Wiring:
https://www.amazon.com/dp/ (commissions earned)