CANFORD PRO-INTERFACE Mk.2 Bi-directional, single stereo, freestanding

A bi-directional stereo interface for matching “semi-pro” or “domestic” equipment, including cassette machines, video recorders and DAT machines for example, to the higher audio levels and differing connection methods of “professional” environments.

This rugged design is constructed in an extruded box, with four XLR connectors on the front panel. Two are female, connecting to high-impedance, electronically-balanced, line-level inputs, whilst the remaining two are male, fed from electronically-balanced low-impedance, line-level outputs. These four connections are to interface with the “professional” environment, but may also be connected unbalanced without loss of level. They are designed to connect with up to 100m FST cable (or similar) to standard line-level (low source, high or “bridging” load impedance) interfaces.

The rear panel has four RCA(phono) connectors to connect to the “semi-pro” device. All are connected unbalanced, and have an adjacent associated multi-turn gain controls to adjust the operating level of the attached device to the line-up level of the “pro” environment. An IEC inlet with fuse provides connection to the mains supply.

Technical Specification:

Unbalanced to balanced sections

Input impedance:	47kohm
Maximum input level:	+22dBu
Nominal gain range:	0dB to +25dB
Load impedance:	>500ohm
Output noise:	-94dB RMS re +8dBu O/P (20Hz-22kHz, +14dB gain), (Input terminated 600ohm)
Harmonic distortion:	0.005%THD (1kHz, +8dBu O/P)
Frequency response:	20Hz-20kHz ±0.1dB
Maximum output level:	+26dBu (10kohm load), +24dB (600ohm load)

Balanced to unbalanced sections

Output noise: –94dB RMS re +8dBu I/P ( 20Hz-22kHz, –14dB gain) (600ohm input termination)
Harmonic distortion: 0.003% (1kHz THD, –14dBu O/P)
Frequency response: 20Hz-20kHz ±0.1dB
Maximum output level: +22dBu (1000ohm load)

Input impedance:	20kohm
Maximum input level:	+22dBu
Input CMRR:	70dB, typical
Nominal gain range:	–25dB to 0dB
Load impedance:	>1000ohm

General

Power supply:	230 VAC ±10% at 6VA
Dimensions:	220 ×110 ×47 (l ×w ×h)mm.
Weight:	1kg