M-Audio SAM Инструкция по эксплуатации онлайн [12/17] 18712

input signal present the mode LED will flicker very rapidly. It will

stop flickering and remain lit if a valid signal is present.

Note: The ADAT In and ADAT Out jacks expect ADAT-compatible

multi-channel signals (ADAT Optical Data Interface format), as

opposed to optical S/PDIF standard. SAM does not support con-

version to and from optical S/PDIF formats, although there are other

products on the market that will convert between optical (Toslink)

and coax S/PDIF formats (the Midiman Co2 product for example).

Note: For best results, use a good-quality S/PDIF cable. The cable

should be coaxial with 75-ohm impedance. A good quality video

dubbing cable (for example) has these characteristics, as do more

expensive professional-quality S/PDIF cables.

In any of the modes, the output sample rate will always be synchro-

nized with the input sample rate. In other words, when using ADAT-

to-S/PDIF modes, the sample rate will be determined by the ADAT

optical stream; when using S/PDIF-to-ADAT mode, the sample rate

will be determined by the S/PDIF optical stream.

The LED output level displays are peak meters that show real-time

output signal levels in all modes. Output level in all direct modes

will precisely match that of the source level. Output level in mix

mode is controlled by the sum of the individual rotary Gain controls.

Digital clipping is occuring when the red “-1/Clip” LED is lit.

Note: Excessive clipping (causing the red “-1/Clip” LED to light

often or to stay lit) may cause extreme distortion and should be

avoided. An occasional CLIP reading is sometimes OK -- it's best

to let your ears be the judge! Generally speaking, the maximum

level before clipping (the yellow “-3” LED lighting occasionally or fre-

quently) is the best level to maintain.

The Mix mode is a special mode in which the SAM gain and pan

pots are active. Each incoming ADAT channel may be independent-

ly attenuated and panned within a stereo output signal. Each Gain

control may be set anywhere from infinite attentuation (turned all the

way counter-clockwise) to 0 dB or “unity gain” (turned all the way

clockwise). This level is also influenced by the position of the Pan

control. In the center detent position, a Pan control attenuates the

signal by 3dB. This practice of slight attenuation in the center posi-