Frequently Asked Questions
Studio Installations
Custom Design and Consultancy
Recording and Mastering
Tape Baking and Recovery
Media Transfer and Processing
MIDI Long Haul Converters
MIDI Merging and Filtering
MIDI Routing Matrices
Custom MIDI Devices
EUREKA Timecode Reader
KV64 192 Key Velocity Keyboard Scanner
Z80-DIO Panel Interface Peripheral
Custom Chip Design
Digital Audio Primer
Professional MIDI Guide
MIDI Protocol Guide
Vintage Microphone Information
Legacy Products
PDFs and Other Downloads
Rare Microphone Cables
Synthesizer Parts
Ex-installation


The simplest way to interconnect a large digital audio installation is to use a patchfield. This is a passive system based on a standardised connector format and intended for connecting various equipment in a studio, but without the need for repatching while sound is active.

The first decision is what number of channels to have as the patching unit. An AES/EBU signal is a stereo pair on an XLR connector so two channels is the smallest unit. However this soon becomes unwieldy in use. A more conveniently sized unit is four pairs of Input and four pairs of Output on a 25 way D-type connector. This format was originally introduced by Tascam and has been adopted by many other manufacturers.

In a D-type patching system all Digital Audio in a studio is brought to a central panel with female D-type connectors on it. Equipment with discrete XLR AES/EBU connectors are grouped with 8 core cable to one connector, equipment already in the Tascam format is kept as is with a male to female 8 core cable. Large equipment with multiway connectors, eg SSL digital consoles with 24 pair connectors, are split it smaller connectors. Any group of 8 channels may be connected to any other group on the patch panel using a male to male crossover cable.

Only two types of free cable are required: a male to male crossover in convenient lengths and a male D-Type to XLR breakout cable. This greatly simplifies the studio cable stock and troubleshooting.

We can custom design and build a digital patching system to suit your requirements and have experience with complex interfacing of SSL Digital consoles with hard disk recorders and Pro Tools systems. Please enquire.

Last updated: 18 March 2006