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The Signature HA1M is a broadcast specification 2 channel headphone amplifier, designed to operate in a mono or a stereo mode.
The HA1M has 2 x XLR inputs that can be used as either a stereo input, or as 2 x mono inputs. There is a selector switch to change between mono and stereo modes.
In stereo mode, the left input goes to the left ear, and the right input goes to the right ear. Each input has its own level pot for adjusting the volume level in the left or right ear.
In the mono mode, each input goes to both headphone outputs. The level pots adjust the relevant input levels in both ears.
There are 2 x headphone outputs on jack sockets. One is 6.35mm and the other is 3.5mm. The headphone circuits can accept stereo connections, or mono connections from single earpieces. The headphone drivers are independent and so varying impedance connections can be used in either socket at the same time.
The rear panel has a single XLR output that is a mix of both inputs.
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 PS1external DC Master Power Station, for situations where a redundant power supply is desirable.