Alesis ADAT-XT20 User Manual download pdf (Page 101)

Chapter 5: Multiple ADAT-XT20 Operation

100 ADAT XT20 Reference Manual

COMBINING XT20S AND ADATS

XT20 T

RANSPORT SPEED

The XT20’s transport speed has been improved to be four times faster in

engaged mode than the original ADAT. Because of this and other

unique features, it is recommended that you make the XT20 the master

(ID 1) in your system and any ADAT(s) should be the slave(s). Until

you need more than 8 tracks, you may want to avoid inserting tape(s)

into the slave unit(s). This is because when locating, the ADATs will

move slower than the XT20. The result is the XT20 will locate to a

specific tape position, stop and wait for the ADAT(s) to get there

before going into play.

SAMPLE RATE VS. PITCH CONTROL

The Clock Select function on the XT20 is another addition not found on

the original ADAT. This function allows you to instantly choose

between 48 kHz or 44.1 kHz sampling rates, as well as lets you select a

digital clock for applications involving the recording of digital audio

from a non-ADAT source). The XT20 also writes sample rate

information when formatting a tape. This way, the XT20

automatically knows which sample rate a tape was formatted with

although either sample rate may be used.

Example: When playing back a tape that was formatted at 48 kHz and

the Clock is set to 44.1 kHz, the 44.1K icon will flash, to indicate that

you are using 44.1 kHz but it isn’t the original sample rate used when

the tape was formatted. The same goes when you playback a tape

formatted using 44.1 kHz with the Clock set to 48 kHz; the 48K icon

will flash.

It is important to remember that on the XT20, the Pitch Controls are

supplemental to sample rate selection. With the original ADAT, you

had to pitch down a tape in order to playback at a 44.1 kHz sample

rate. This is no longer necessary on the XT20 due to the addition of the

Clock Select function.

If you play back a tape that was formatted on an original ADAT, it

will not have any sample rate information written on it (since this is a

new feature not found in the original ADAT). The XT20 will

automatically select the 48 kHz setting in this case. Therefore, if you

had been pitching-down such a tape to play at 44.1 kHz, you must press

the [CLOCK SELECT] button to manually change the XT20’s Clock to

44.1 kHz.

INPUT MONITORING

The original ADAT was designed so that when you were monitoring a

track’s input signal, what you heard was the actual analog input being

fed directly to the analog output—the signal did not pass through the

A/D and D/A converters. There was an advanced feature whereby, if

you held [SET LOCATE] and pressed [ALL INPUT], it would then allow

you to monitor the input after the converters, so as to hear exactly how

the signal would sound when played back from tape.

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Alesis ADAT-XT20 User Manual Page 101

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