American Audio PSX - REV 1-2 Bedienungsanleitung PDF herunterladen (Seite 19)

When recording signals with sharp transients – drums and percussion, for example – many engineers do not

mind occasional 1 to 3 consecutive sample overs (in fact, some record with overs on purpose!). Remember that

one sample is a very short period of time. Often 1 or 2 consecutive clipped transient samples will not neces-

sarily be apparent. One reason to avoid having the threshold set at 1 sample in these situations is so that the

engineer is not persuaded to lower the recording level to tape/disk when the indicators are only registering

transient OVERs. On the other hand, during the mastering process, it is important not to register any OVERs in

order to avoid problems at the pressing plant.

The chart below shows the position of DIP switches 6 and 7 for different consecutive sample thresholds.

DIP 6 DIP 7 # of consecutive OVERs

needed to illuminate OVER LEDs

down down 4

up down 3

down up 2

up up 1

External Settings

Calibration Mode (“Meter Zoom”)

Press & Hold the SOFT LIM button to enter Calibration Mode. The SOFT LIM LED will flash. In this mode, the

meter scale reads from –20 dBFS (bottom LED) to –11 dBFS (top LED), ie one LED per dB, and the OVER LED

illuminates when the level is within ±0.1 dB of the indicated value. CAL mode only affects the meters, and can

thus be used whether metering the A/D or D/A, in any operational mode.

D/A Calibration

The D/A converter can be calibrated over a wide range of likely operating values. It is calibrated from the fac-

tory so that an incoming digital signal at –16dBFS produces a level of +4dBu at the analog outputs. So, for

example, if you wanted the D/A converters to output a hotter (louder) signal at the analog outputs, you would

feed the digital input a level under –16dBFS (for example, –18dBFS) and calibrate the outputs until the analog

output level read +4dBu. Likewise, if you wanted a lower DAC output, you would feed the unit a –14 dBFS sig-

nal, for example, and calibrate the DAC accordingly. On the next page are brief instructions on how to calibrate

the D/A and A/D converters.

PSX-100 User’s Manual

Page 19

As set at the factory, a digital signal at

–16dBFS produces a level of +4dBu at the

analog outputs.

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American Audio PSX - REV 1-2 Bedienungsanleitung Seite 19