Check the listing for details. Radial Engineering Cab-Link Passive Speaker Cabinet Merger. Condition: New. Listed at 149.99 USD. The Tonebone Cab-Link provides a simple and compact solution for players who have a single speaker output on their amplifier but want to connect two cabinets simultaneously.Completely passive with no need for power, the Cab-Link combines two cabinets in either series or parallel configuration, which allows their total impedance to match the output impedance of the amp. Both cabinets are connected via speaker cables to outputs A and B and an easy-to-use guide on the top of the Cab-Link lets you know which input to connect your amp to, depending on the impedance ratings of your cabinets. For example, if you have two 8 Ohm speaker cabinets, they can be combined in series for a 16 Ohm amplifier or in parallel for use with a 4 Ohm amp.