http://www.ampeg.com/pdf/SVT400T.pdf
According to this manual, the amp has either 1/4" jacks or banana plug/binding posts. You can either use a 1/4" to 1/4" speaker cable, or else one with banana plugs on one end and 1/4" plug on the other.
The manual also states that in bridge mode, the impedance should be 8 Ohms or greater. Based on that, bridge mode isn't recommended for this cabinet. Run it instead in "slave mode" and just use one amp channel for this speaker cabinet.