Apogee AD-8000 Anwendungshinweise

Blättern Sie online oder laden Sie pdf Anwendungshinweise für Computer Hardware Apogee AD-8000 herunter. Apogee AD-8000 2 Seiten. When i feed the ad-8000 a 20- or 24-bit signal from some of my gear, the 16/20/24 resolution indicators do not read the correct word length (number of bits). why is this?
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Application Notes

The steps below describe how to calibrate soft limit on the AD-8000 using the oscillator on a

console or using test bench gear.

Soft Limit calibration procedure using a recording console

1. Calibrate the AD-8000 inputs to your optimum headroom setting using an oscillator via your

mix desk's stereo output, or any metered source (see AD-8000 manual for calibration

instructions).

2. Patch the oscillator into a mult on your patchbay (2-channel to 4-channel parallel).

3. Patch one set of outputs from your mult into two of the analog inputs of the AD-8000.

4. From the same mult, patch the other set of outputs into a line input of your mixing desk.

5. With Soft Limit turned off, set the oscillator to 1 kHz, increase the oscillator level to where the

"over" LEDs light up, then reduce the level until they just go out.

6. Making sure there is no signal processing (dynamics, EQ, effects, etc.) dialed into the mixing

desk's signal path, push up the line fader until the desk's stereo output meter reads the

threshold you wish to attain using the Soft Limit feature. The factory setting is –4 dBFS (i.e.,

4 dB under full-scale digital), so to check that it had been set correctly you would make your

stereo meter read -4. If you wish to decrease the threshold to –6, (2 dB more limiting,

effectively 2 dB more headroom) make the meter read –6. Alternatively, if you wish to

increase the threshold to –2, (2 dB less limiting) your meter should read –2.

7. Turn on Soft Limit.

8. Increase the oscillator output until the desk's stereo meter reads 0 VU (don't touch the

console fader at this point).

9. Remove the cover from the AD-8000 to expose the circuitry inside and find the SOFT LIMIT

adjustment pots. You will find them on the analog board labeled R33-1 through R22-8 (they

are eight silver cubes with white centers).

10. Now simply adjust the pots until each corresponding "over" LED lights then back off until

they just go out.

Apogee Electronics Corp

Calibrating SOFT LIMIT

Product: AD-8000

Topic: Calibrating Soft Limit

Document #: 4

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