American Audio PSX - REV 1-2 Bedienungsanleitung Seite 20

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Calibrating the D/A Converter
1. Use an external source to provide digital signal to the D/A.
2. Verify that D/A SYNC is correct and locked.
3. Ensure that DIP switch 4 (Output level) is set correctly: OFF for +4dBu, ON for 10 dBV
4. Using a tweaker or small flathead screwdriver, rotate the left and/or right trimpot in a clockwise direction
to increase gain of the D/A. It is not necessary to use a non-conductive tool.
Calibrating the A/D Converter
1. Ensure that DIP switch 5 (Input level) is set correctly: OFF for +4dBu, ON for 10 dBV.
2. Using a tweaker or small flathead screwdriver, rotate left and/or right trimpot in a clockwise direction to
increase gain of the A/D. It is not necessary to use a non-conductive tool.
Using the AUX Output
The AUX connector on the rear of the PSX-100 is an auxiliary AES output which, when available, always deliv-
ers full 24-bit resolution. It was originally designed to allow easy connection of an external, high-accuracy digi-
tal meter for mastering and monitoring applications; however it also has other uses.
The AUX output is essentially the same signal as appears at the INPUT of the D/A Converter in the PSX-100. If
you bear this in mind when you wish to use the AUX connector, you wont go far wrong.
The AUX output is available at 88.2/96 kHz sample rates (FAST mode), but it will only output every other sam-
ple, at 44.1/48 kHz. This may be fine for metering, but the filtering will be wrong for accurate 44.1/48 kHz
recording and we do not recommend its use for recording purposes in FAST mode.
Typical Applications
Metering
While using the PSX-100 A/D and D/A in Confidence Mode, for example wrapped around a digital recorder, the
AUX output can be used to connect an external metering system for increased accuracy. The AUX output deliv-
ers the same signal as is present at the D/A input
, so you will need to insure that a useful signal is being returned
to the D/A inputs from the recorder, or this output will not work!
Recording a 24-bit signal while simultaneously recording one or more 16-bit signals
The AUX output is always operating at full 24-bit resolution. As a result, you can connect it to the AES input of
a 24-bit recorder such as the Tascam DA-45HR while you have the main outputs set to 16-bit UV22HR the lat-
ter being sent to, for example, one or more 16-bit DAT machines. It is tempting to use Confidence Mode for
this purpose you cant!
Confidence Mode separates the A/D and D/A , and the AUX output is the same as the
D/A input
, so if you feed the output of the DA-45HR to the D/A input and the AUX output to the DA-45HR input
you will in fact be creating a feedback loop!
The solution is to use Analog Monitor Mode. In this mode, the A/D feeds both the main outputs
and the AUX
output
; the AUX output is always 24-bit; and you can simultaneously use UV22HR on the main outputs. In addi-
tion, the D/A is fed from the A/D as well, so if you monitor the D/A output you will simply be listening to the
A/D converter. Note that you will need to switch
out of Analog Monitor Mode to replay the recorded signal,
and you should temporarily disconnect the path from the AUX output at the same time to avoid a feedback
loop when you are not in replay on the DA-45HR.
You can, incidentally, use the DA-45HR locked to the PSX-100 crystal at all times, using the Word Clock output
from the PSX-100. This will insure that you do not lose sync when the AUX output ceases to generate useful
output in Confidence Mode (which would be the case if you were relying on the AES signal for sync).
PSX-100 Users Manual
Page 20
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