Alesis K2661 specifications Using the Digital Outputs, 15-3, Left Right

Audio Outputs

Using the Digital Outputs

Using the Digital Outputs

Digital audio output is available at the ADAT/AES Out optical jack on the rear panel of the K2661. The format of the digital output stream can be chosen to match your other digital audio equipment. Formats supported by the K2661 include ADAT 8-channel, AES/EBU Professional 2-channel, and AES Consumer (also known as S/PDIF) 2-channel.

In ADAT digital format, the 8 channels correspond to the 4 stereo outputs found on the KDFX Output page. The AES 2-channel formats correspond to the output A stereo pair.

The table below summarizes the K2661’s digital outputs:

	A Left	A Right	B Left	B Right	C Left	C Right	D Left	D Right
ADAT	1	2	3	4	5	6	7	8
AES	1	2

Note: To use ADAT In, the ADAT Out cable must be connected to the sending device.

The word length of the digital data can be set to match your other equipment. It is generally best to use 24-bit digital formats, since it increases dynamic range and reduces the effects of noise. However, some older equipment may not be compatible with 24-bit data and therefore the K2661 supports 16 and 20 bit digital word lengths.

Choosing digital format and word length is done in Master Mode. See Digital Output

Format on page 11-11for details.

The output sample rate is fixed at 48KHz. In any situation requiring different sample rates, you’ll need to use a sample rate converter (like the DMTi). When you need a clock signal to synchronize two or more instruments, there are two options:

•Make the K2661 the master; it can’t be slaved to an external clock signal. Use a sample rate converter, if necessary, to match the sample rates of your other instruments.

•Make another instrument the master. The K2661 won’t respond to the clock signal. Use a sample rate converter, if necessary, to match the K2661’s output rate to the master’s rate.

When you need to slave one or more instruments or devices to an external master clock, the K2661 is necessarily the master, because it can’t be slaved to an external clock.

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