When preparing for a new album, guitarists really need a fast and reliable way to compare and reconfigure their many amplifiers and cabinets without the lengthy process of manually swapping cables. Accurate comparisons between the different combinations are near impossible and the time taken between setup changes interrupts workflow. DACS'  solution to this problem is a design that allows the guitarist and producer to sit in the control room sweet spot and remotely configure the amp collection in seconds; they can achieve in a morning what had often in the past taken up to two days or more.
 
User Interface/Selector Unit
The HeadLine selector unit has 12 illuminated buttons, 8 red and 4 blue. The red buttons are for selecting guitar amplifiers and the blue for selecting loudspeaker cabinets. The loudspeaker connections are continuously monitored. This ensures that there is a functioning loudspeaker present and there is no short or open circuit.
 
When routing, available speaker outputs will be shown by a dimly lit switch. Unavailable outputs will not be illuminated.
 
To label each amplifier and cabinet we use a Neodymium magnetic strip set into the case, onto which white magnetic labels are placed (pre-cut strips with a whiteboard pen are supplied in a drawstring bag). The strips are cut to size.  Extra labels are supplied so you can keep a collection of prewritten labels or printed tape labels ready for use on a new session.
 
Relay Switcher Unit
The HeadLine switcher unit switches all screens/0V lines with the signal lines ensuring total isolation between amplifiers, and total fidelity of transmission. On unselected amplifier inputs, the signal and screen are linked (like a ‘silent switch’ jack) to ensure there is no hum or other interference picked up by the amplifier. Unselected amplifier outputs are connected to a dummy load to ensure that sensitive valve output stages are not compromised.
 
When a new amplifier or loudspeaker is selected, the first step is to disconnect the currently active amplifier input line and link the signal and screen. Very shortly after this the selected amplifier output is routed to the selected loudspeaker, then the guitar input is connected. The very short delay gives the amplifier a chance to settle, and any reverb to dissipate before disconnecting its output. Changing loudspeakers follows the same procedure.
 
Connection
For plugging in the guitar there are two possibilities (included with the HeadLine is a 5m guitar cable)
 
Guitar is plugged into the front of the Selector unit, which is paralleled to two connectors on the rear, one for connecting to a tuner and one to route to the Relay Switcher; this cable can be plugged into the front or rear of the Relay Switcher
 
Guitar is plugged into the front of the Relay Switcher unit and the jack on the rear can be connected to a tuner.  On the rear of the Relay Switcher unit are a number of jack sockets, an RJ45 input and the mains power connector.
 
The left most socket (GUITAR IN/TUNER) will either be fed as Option 1 from the guitar selector unit, or as Option 2 to a tuner (see connection diagram).