Apogee AD-8000 Specifications download pdf (Page 13)

Soft Limit

is the same exclusive transparent system of controlling digital “overs” that Apogee has become

famous for with our two-channel AD-500 and AD-1000 A/D Converters. It can allow several more decibels of

apparent level to be recorded on your digital tape, while subtlely giving your recording a more “analog” sound.

Soft Limit may only be selected on

analog inputs and cannot be selected on digital input sources.

To select Soft Limit on individual channels, press the SOFT LIMIT button briefly and the indicator will light.

Then select the channel you would like to apply it to by pressing one or more of the eight CHANNEL SELECT

buttons below the meters. The Soft Limit indicator on the channel you’ve selected will illuminate. If you wish to

select all the channels, press and hold the SOFT LIMIT button for at least one second. Whenever the Soft Limit

threshold is crossed, the decimal point on the Over Counter display will light, so you’ll know when it’s working.

UV22

is Apogee’s exclusive process of encoding high resolution (20 to 24 bit) digital audio into 16 or 20

bit formats – avoiding truncation, dithering or “noise shaping”, processes that either add noise or can adverse-

ly affect the audio quality of your recording. You can apply UV22 to

individual analog input channels or pairs of

digital inputs. UV22 is selected in the same manner as Soft Limit. If your recorder is not capable of 24 bit record-

ing, you should select UV22 on all channels. If you expect UV22 to be used on your project later on down the

line, for example mastering or mixing, set UV22 to “low” by switching SW5 on the Aux Control DIP switch

(found on the back of the unit) to ON. The “normal” UV22 setting is SW5 OFF (default).

UV22 can be set to deliver a 16- or 20-bit output, according to the setting of the SW2 DIP switch on the

rear panel: OFF (default) selects 16-bit; ON selects a 20-bit output. Set this switch according to the resolution

of the digital device you are using with the AD-8000.

IMPORTANT NOTE: Most current DAT machines (with a couple of exceptions) do not actually record more than

16-bit words to tape, even though some say “20 bit” on them. This actually means that the analog to digital

converters are 20 bit, but the extra four bits have been “dithered”, “noise-shaped” or merely truncat-

ed (chopped off) before recording. UV22 is a much more efficient way of doing this, and we believe

you’ll find that the result of using the UV22 process is a significant, audible improvement in audio qual-

ity at the final resolution of your recording. The simple rule is to check the actual resolution of your recording

system. If it records 24-bit, set UV22 off. If it records 16 or 20 bits, set UV22 accordingly.

Digital In

DIGITAL IN is selected the same way as Soft Limit and UV22. If you have a digital source connected to an

AMBus card, channels from that source can be routed to corresponding channels of your destination machine.

Using this facility, you can record analog sources on some tracks and transfer digital sources between

recorders/workstations on others while simultaneously format converting, if need be. The channel routing LED

display matrix and the source indicators on the right of the front panel show you the source and destinations

of digital signals. Digital inputs are selected in pairs: channels 1/2, 3/4 etc.

Mute

This is selected in the same way as Soft Limit and UV22. To select MUTE on individual channels, press the

MUTE button briefly. The indicator will light: then select the channel you would like to mute by pressing one or

more of the eight CHANNEL SELECT buttons below the meters. The MUTE indicator on the channel you’ve

selected will illuminate. If you wish to mute all the channels, press and hold the MUTE button for at least one

second. The Mute function sends “digital black” (no sound, with clock) to the selected channels. Meters are

“muted” when the corresponding channel is muted. This occurs in Normal, Calibrate and Oscillator modes. In

all cases, a muted meter will have no bars lit.

Channel Routing

The 8 by 7 LED channel routing matrix displays what sources are feeding each of the eight channels. If the

top row is all lit, then analog to digital conversion is taking place on all channels through the unit (analog

sources.) To transfer from a digital source, select the source using the SOURCE button (at right), press the DIG-

ITAL IN button and select whatever channels you would like to transfer from the digital source.

AD-8000 Operating Manual

Page 13

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Apogee AD-8000 Specifications Page 13

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