Compact Cassette
This page provides an overview of the workflow for transferring analogue Compact Cassette.
1. Calibration and Alignment
This is a reference guide for calibrating Compact Cassette replay equipment. Routine calibration and alignment of cassette decks ensures optimal playback performance.
Engineers should calibrate their machines:
- Once a week during operation
- When a new deck is installed
- At the start of a preservation project
1.1. Equipment List
- Tascam 122 MK3 with adjustable azimuth
- Azimuth screwdriver
- Prism Titan ADC
- Cassette Calibration Tape
- Phase Scope
- PPM Level Meter
1.2. Alignment Measurements
Play the calibration cassette in the chosen machine and align to the target levels:
| Measurement | Frequency | Nominal Level | Target Level | Measurement Tool |
|---|---|---|---|---|
| Azimuth | 3.15kHz | 0dBu | Phase convergence at 0° | Phase scope |
| Level | 400Hz | 0dBu | -20dBFS | PPM meter |
| Level | 1kHz | 0dBu | -20dBFS | PPM meter |
| HF Response | 10kHz | -10dBu | -30dBFS | PPM meter |
| HF Response | 15kHz | -20dBu | -40dBFS | PPM meter |
Note - If calibration values cannot be achieved, refer to Sound and Audiovisual Electronics Engineer.
1.3. Cassette Calibration Tape
For reference, the full list of line up tones and their time markers on the calibration cassette (also printed on the front of the case):
| Time | Freq | Nom. Level | Actual L | Actual R | Meter L | Meter R |
|---|---|---|---|---|---|---|
| 00:00:00 | 3.15kHz | 0dBu | 0dBu | 1.5dBu | 0dBu | 1.5dBu |
| 00:07:30 | 400Hz | 0dBu | 0.7dBu | 0.7dBu | 1.0dB | 1.0dB |
| 00:15:00 | 1kHz | 0dBu | 1.0dBu | 1.0dBu | 1.0dB | 1.0dB |
| 00:22:30 | 10kHz | -10dBu | -10.5dBu | -10.5dBu | -10dBu | -10dBu |
| 00:30:00 | 12kHz | -12dBu | -12dBu | -12dBu | -12dB | -12dB |
| 00:37:30 | 15kHz | -20dBu | -19dBu | -19dBu | -20dB | -20dB |
| 00:45:00 | End |