The Signature HA2+ is a broadcast specification, twin headphone amplifier, designed to operate in a mono or a stereo mode.
The HA2+ has 2 x XLR inputs that are used as the primary programme audio input. This can be stereo, or, if mono, can be switched to appear on both sides of the headphone outputs. There are left and right programme input gain controls on the front panel, and they are on recessed screw terminals.
There are also secondary, mono cue inputs. Connections are via one of 3 x 6.35mm jack sockets on the rear panel. This allows a single cue input to be connected to both headphone outputs, or each headphone amplifier can receive an individual cue input.
On the front panel there is a source control for each headphone output that allows a mix between the programme and cue input. Full left is programme only, full right is cue only, and anywhere in between is a variable mix.
Each of the two headphone amplifiers has its own volume level control. There is also a master volume control that affects the overall level of both amplifiers. This can be defeated via a rear panel dip switch.
The headphone outputs are available via 2 x front panel 6.35mm headphone sockets, and in parallel on 2 x rear panel XLR connections.
The Expedition uses Glensound’s propriety CAN headphone system. This allows multi impedance headphones to be used, from 32-1000ohm, with the same perceptual level in the headphones when the volume control is kept in a fixed position. Stereo or mono connections can also be made to the headphone sockets, including mono earpieces.
Rear panel inputs and outputs are electronically balanced on XLRs and can accommodate unbalanced connections if required.
Power is provided by an internal switch mode power supply, with a wide input range. There is also an input for external 12V DC power. The 12V DC input can be connected to the optional Signature Ps1 external DC Master Power Station, for situations where a redundant power supply is desirable.
A bright front panel LED indicates that the unit is operational.