JBL MTC 200BB6 Backbox for 6 inch C200 option title 18" Subwoofer Included Accessories: C ring support backing Custom TAB Funkenwerk AMI Included Accessories: C ring support backing plate the RX4L has line level isolation transformers to eliminate hum and buzz Lined with 12 mm (1 2 in) thick MDF to eliminate resonances and to provide extra bass response JBL MTC 200BB6 Backbox for 6 inch C200
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