Audi A5, S5 Sportback II (2016->) subwoofer box (stealth).
Car Audio & Security - Audi A5 S-line with complete audio install. Dynamat Sound Deadning throughout the complete car, front, doors and boot! JL Audio XD700/5 amp, JL Audio ZR-650-CSi in the
Sportback Subwoofer Upgrade | Audi A5 Forum & Audi S5 Forum
Audi A5 B&O Sound - Adding Subwoofer with Amp advice - AudiWorld Forums
Which subwoofer for Audi A5 upgrade | diyAudio
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Subwoofer Audi A5 Sportback 2.0 TFSI 16V - 8T8035382