S550: Mercedes Custom JL Audio Upgrade Leave a Comment / Audio, Custom Fabrication / By Ultra Auto Sound S Class Custom fiberglass enclosures made for the sides JL Audio slash series amplifiers running all speakers in the car including the subwoofers that we just put in. Finished in leatherette. Everything hidden. 2 Hours of fine tuning. Splendid! Share This:FacebookTwitterEmailLike this:Like Loading... Related