BMW Amplifier Upgrade QM Four 4ch 520w P&P amp for base systems to split subs
Amplifier Upgrade QM Four 4ch 520w plug & play amplifier. 1 x ESX QM Four Amplifier. Class D Micro Amplifier. 4-Channel Class D Amplifier. 1 x 5m bmw underseat sub and mid seperation cable. ESX MQ FOUR.