TS-A709 2.75" A-Series 2-Way Coaxial Car Speakers 450W Max (Pair) 2004-volvo-v70-station-wagon-with-navigation-system-esi4835555 users can control the output

users can control the output volume using the included wired remote bass control knob

This subwoofer features an injection-molded polypropylene (IMPP™) cone infused with Aramid fibers for exceptional precision and strength

The TS-A301S4 12” dual-voice coil subwoofer features a redesigned large and powerful 90 oz double-stack magnet for improved efficiency and sensitivity

The MVH-S230BT offers Bluetooth connectivity for hands-free calling

As to software

TS-A709 2.75" A-Series 2-Way Coaxial Car Speakers 450W Max (Pair) 2004-volvo-v70-station-wagon-with-navigation-system-esi4835555 users can control the outputThe TS A709 is a 2 way coaxial 2 3 4" speaker. Its Injected Molded Polypropylene woofer cone stands up to the harsh in car environment while providing natural sounding tonal qualities with an OPEN & SMOOTH transition to the polyetherimide Tweeter. The TS A709 is an A Series speaker. All A series speakers share the OPEN & SMOOTH design concept and are voiced to sound great together.