Specifications

Applications - Chapter 11
62 ADAT LX20 Reference Manual
DIGITAL CLOCK CONSIDERATIONS
Switching between the LX20’s two internal clock sample rates (48 kHz and 44.1
kHz) changes the reference used for computing tape location. Therefore, the same
tape location will appear to have two different time addresses depending on the
selected sample rate.
Since the LX20 cannot detect an external clock’s sample rate, you need to choose the
reference base the LX20 should use to calculate tape position while syncing to a
digital clock. Select either DIG 48K or DIG 44.1K (shown in the Clock block) with
the CLOCK SELECT button.
COMBINING LX20S AND ADATS
LX20 T
RANSPORT SPEED
The LX20’s rewind/fast forward speed is four times faster in engaged mode than the
original ADAT. Because of this and other unique features, make the LX20 the
master (ID 1). Older ADAT(s) should be the slave(s).
When locating, the LX20 will locate to a specific tape position, stop, and wait for
the ADAT(s) to catch up. Therefore, until you need more than 8 tracks, don’t put any
tape(s) into the slave unit(s) so that the LX20 won’t have to wait for the slave(s) to
locate.
SAMPLE RATE VS. PITCH CONTROL
The LX20’s Clock Select function, which allows choosing between 48 kHz or 44.1
kHz sampling rates, was not available on the original ADAT. This function also
alows selecting a digital clock for applications involving the recording of digital
audio from a non-ADAT source.
The LX20 writes sample rate information when formatting a tape, so that it
automatically knows a formatted tape’s sample rate (even though either rate may
be used).
Example: When playing back a tape formatted at 48 kHz with the Clock set to 44.1
kHz, the 44.1K indicator 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 LX20 Pitch Controls supplement the sample rate selection. With the original
ADAT, you had to pitch a tape down to play back at a 44.1 kHz sample rate. This
is no longer necessary on the LX20 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. The LX20 will automatically select the
48 kHz setting. If you had been pitching-down such a tape to play at 44.1 kHz, you
must press the LX20’s CLOCK SELECT button to manually change its clock to 44.1
kHz.