Installation
EST3 Installation and Service Manual 5.49
Adjusting amplifier output levels
What you will need
An initial startup version of the project database that contains a
1kHz tone and a switch programmed to turn the tone on. See
“Creating an initial startup version of the project database.”
An RMS voltmeter (Fluke 83 or equivalent)
Adjustment procedure
1. Disconnect the field wiring to all the zoned amplifier
modules in the cabinet.
2. Place an RMS meter across an amplifier’s TB2 NAC/B+ and
NAC/B- terminals.
3. Use the 1KHZ_TONE switch to turn on the tone.
4. Adjust the amplifier’s gain pot until the RMS meter displays
the configured output level (25 or 70 Vrms).
5. Connect the amplifier’s field wiring.
6. Use the 1KHZ_TONE switch again and verify that the
output level remains the same. Readjust the amplifier’s gain
pot if necessary.
7. Disconnect the amplifier’s field wiring.
8. Repeat steps 2 through 6 for each amplifier in the cabinet.
9. Reconnect the field wiring for all the amplifiers in the
cabinet.
Design considerations
Your audio system will work best if the prerecorded tones and
messages have roughly the same volume, or amplitude. The
process of establishing a common maximum amplitude is
sometimes called normalizing.
We suggest that you normalize your tones and messages to a
maximum amplitude of 1 V peak-to-peak, or an average of 0.7
Vrms.
The SDU does not contain a tool for normalizing your audio
clips, so you'll need to use a sound editor to normalize the clips
before you import them into the SDU database.
The audio clips included in the EST3 Support Library CD have
already been normalized.
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