Allen & Heath DR66 Architect's Specification

The unit shall be a digital mix processor with 6 analogue inputs and 
6 analogue outputs. The unit shall have a full crosspoint matrix, 
comprising 36 points, allowing any input, or combination of inputs, 
to be routed to any output or combination of outputs. All crosspoints 
shall have a variable level. The 2 mic/line inputs and 6 line level 
outputs shall be on balanced XLRs with level trims. The 4 stereo line 
inputs shall sum to mono and be on RCA phono connectors with level 
trims. Comprehensive ducking capability shall be provided.

The mic/line inputs shall have internal jumpers for pad and phantom 
power selection. The mic/line gain range shall be 6dB to 55dB with 
input impedance of 2k ohms (no pad) or 10kohms (pad). The phono input 
gain sensitivity shall be internally link-adjustable from -10dBv to 
+4dBu with an impedance of 10k ohms. The inputs shall be converted 
using a 20 bit analogue-to-digital converter. 

The XLR outputs shall have a link-selectable sensitivity from -10dBV 
to +4dBu with an output impedance of 50 ohms. The conversion shall be 
by a 20 bit digital-to-analogue converter.

The unit shall be configured over a standard RS232 port using a 
proprietary 32-bit Windows(tm) based software application with a 
Graphical User Interface. Configurations shall be editable both on 
and off-line. The configuration shall determine the allocation of 
internal signal processing resources to input and output channels, as 
well as routing, passwords, levels and channel names. After 
configuration, the unit shall run standalone, without an external 
computer. Signal processing resources available shall include 
compressors, gates, limiters, graphic equalisers, parametric 
equalisers and crossovers. An optional expander card shall provide 
the facility for additional signal processing resources or 
supplementary delay resources. The unit shall use Flash memory to 
permit firmware upgrades via the RS232 port. An internal real-time 
clock shall allow scheduling of timed events.

The unit shall be compatible with BS5839 installation requirements. 
The hybrid switched/linear power supply shall allow emergency 
operation with a single 24V external battery and the unit shall 
interface with alarm systems. The total power consumption shall be no 
more than 20VA and the permissible incoming mains voltage range shall 
be configurable to 100, 120, 220 or 230 VAC. 

The front panel shall feature 8 installer-definable function keys for 
user control of volume levels and patches. There shall also be a 
backlit LCD for indication of setup menus, peak conditions, patch 
status and channel levels. Important system parameters, such as Patch 
Naming, Channel Naming, Limiter control, Ducking control, Phase 
reversal, Routing assignments, Date/Time, LCD contrast and Soft Key 
definitions shall be password-protected from user adjustment. 

Facilities for remote control of unit parameters shall be provided. 

The unit shall weigh no more than 7kg in a 1U rack-mount chassis. The 
chassis shall be constructed from zintec steel and feature a 
removable top for configuration of internal jumpers and presets. 

The unit shall be the Allen & Heath DR66 digital mix processor.