M-Audio 66 manual

message are two ‘grayed-out’ buttons: “Coax(RCA)” and “Optical.” These are functions of the Delta DiO 2496, another product in the M Audio Delta line, one with both optical and coaxial S/PDIF inputs. These controls do not apply to the Delta 66.

DIGITAL OUTPUT FORMAT: Within the “Digital Output Format” group, you choose the digital audio format of the S/PDIF output. The default setting, “Consumer,” is a true S/PDIF format and is recognized by all consumer devices. The alternate “Professional” setting is an AES/EBU type data stream, but electrically S/PDIF. This is a work-around that is recognized by some but not all AES/EBU devices.

For both consumer and professional output formats, the “Advanced” checkbox will allow you to force a few particular status bits in the outgoing S/PDIF signal. The advanced option is for expert users only; however, if you decide to go exploring, change a few bit settings and get lost, you can always select the “Restore Defaults” button to restore the outgoing status bits to their factory settings. When “Consumer” and “Advanced” are both selected, the group “Consumer Format Advanced Settings” will appear. When “Professional” and “Advanced” are both selected, the group “Professional Format Advanced Settings” will appear. These groups are described below:

Consumer Format Advanced Settings (Copy Mode): Copy protection, also known as Serial Copy Management System (SCMS), is written into the S/PDIF subcode, a reserved part of the S/PDIF digital stream that is independent of the actual audio data being transmitted. It can be used to inhibit the amount of copies that can be made, or allow for unlimited copying. Three SCMS modes are available. “Original (Copy Permitted)” indicates that the source material may be copied by a receiving device. “1st Generation” indicates that the source material is a first generation copy. Most devices that are capable of recording will reject material with this SCMS mode set. The final option is “No SCMS” which may be used to override the other two modes and allow a recording device to successfully record the audio data. Different manufacturers’ products may interpret these codes differently and require you to set these bits by “trial-and-error” until proper operation is achieved.

Consumer Format Advanced Settings (Emphasis): This status bit is used to indicate if pre-emphasis has been applied to the outgoing digital audio signal. The default is “None” and rarely will any user want to set the value to “50/15uSec” unless the transmitted audio has been encoded with 50/15uSec pre-emphasis.

Professional Format Advanced Settings (Data Type): The user may assign the outgoing data as audio or non-audio data. Many devices ignore this setting. The obvious default is “audio.”

Professional Format Advanced Settings (Emphasis): The user may choose to indicate or not indicate if pre-emphasis has been applied to the outgoing digital audio signal. The default is “None” and rarely will any user want to set the value to

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