Each has a 65mm speaker for monitoring, and a socket for headphones. The rechargeable battery is a slot-in 'Sony' style lithium ion type, which provides up to 15 hrs use. This charges internally when an external power source is connected. On the rear are two miniature jack sockets for microphones and a 2.1mm co-axial socket for power. Two 9-pin male D-sub connectors provide connection to a PC by RS232 and audio inputs. Two female types are used for oscillator and line outputs. The input and output connectors are wired to the 'UniSon' 'standard', used by Lindos, which combines two balanced analogue audio channels and power for an external device on one connector.
Technical Specification - Common to all models
Load: 600 ohms minimum, -72dB THD. Outputs: Two channels, 10ohm, balanced, centre-grounded, 9-pin D-sub. Inputs: Two channels, 44kohms balanced or 22kohms unbalanced, -60dBu to +19dBu. Microphone inputs: Two 3.5mm jack, 5V power, calibrated 30dBu =100dB SPL for MM3. Output frequency: 4Hz to 40kHz sine waves in 1/3rd-octaves or 1/12th octaves; 1kHz, 5kHz, 10kHz square waves. Accuracy +/-0.05% of specified synthesised frequency. Output level range: -90dBu to +19dBu in 1dB steps, balanced, centre grounded; 96dBu to +13dBu unbalanced. Accuracy+/-0.02dB at 0dB, +/-0.05dB -60dBu to +19dBu. Output distortion: -76dB distortion residue, weighted, -86dB/0.005% THD at 1kHz, 22Hz-22kHz bandwidth, typical. Output flatness: +/-0.02dB, 20Hz-20kHz, -0.05dB at31kHz, -0.6dB at 16Hz and 40kHz, typical. Noise: -86dBu residual noise, muted, to ITU468. Power source: Rechargeable battery or 11-14V DC, 500mA. Dimensions: 215 x x160 x 33 (w x d x h) mm. Weight: 0.6kg.