We repair and test original BMW amplifiers for BMW E60 E61 E65 ( 5 series 6 series 7 series) Logic 7 amplifiers made by Harmon Kardon. If your system has no sound or one of the speakers not working we can help. Repairs are done by us at our premises. If you send unit to us or pop by for a diagnostic check and removal of faulty amplifier. Call us for more information – 01932 800800