[Hiker]

For all who seek extended lower frequencies for a much improved Sony audio music experience, you are in the right place.

My first advice if you can afford it, get a good compact Sub-Amp.
I chose the JL Audio XD 600. Then add a LC2i high to low converter. Complement this with a 4 gauge copper wiring kit.

Because of the small compact footprint, you can install both of these items under the passenger side seat.
This is the install with the passenger side seat removed (4 T50 Torx screws in my case).
20200528_194858 by

Be sure to add a Sub-Amp bass knob as pictured below.
[url=https://flic.kr/p/2j6Fcd6]20200528_201002 by

This is the Sub-Amp install with the passenger seat re-installed. As you can see you still have access to make adjustments with seat in the max forward & max height adjusted.
[url=https://flic.kr/p/2j6FcbY]20200528_203805 by

Add your favorite Sub-Woofer and you're good to go.

 

[Magnetic]

What year is your Sport? The reason I ask is my 2017 Sport has vents under the passenger seat that blow toward the back. I am considering adding an Audio Control ACM-1.300 under the seat and I worry about the amp being under there when the vents are blowing heat through those vents in the winter.