Check the listing for details. Manley Labs Backbone Mastering Console with DB25 Connectors #MMBB115DB (Used). Condition: Used. Listed at 4895.00 USD. The Backbone represents Manley's approach to mastering infrastructure: uncompromising transparency combined with practical functionality. Hand-assembled at Manley's California facility with professional-grade components throughout, the Backbone provides the routing flexibility and signal integrity required in world-class mastering studios.