Audio bit Ten - Amplifier and Input Sensitivity Calibration; Amplifier Sensitivity Calibration Methods

ADVANCED MANUAL / bit Ten /
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6.3 AMPLIFIERS SENSITIVITY CALIBRATION
6.4 HOW TO CALIBRATE THE PHONE AND AUX IN INPUT SENSITIVITIES
Once the bit Teninputcalibrationorde-equalization(ifany)proceduresarecomplete,youcancalibrateamplifierssensitivity.
•Settheamplifierscrossoverfiltersasdesiredandthenconnectthemtothespeakers.
 •Connectthebit Ten PRE outputs (Front - Rear - Sub outputs) to the amplifiers inputs using high quality RCA cables.
 •Settheamplifierssensitivityofthevariouschannelstoabout4.0Volts.
Once the system is calibrated and fully working through the Front / Rear inputs, you can calibrate the PHONE and AUX
IN inputs.
- PHONE: To use this input you need to connect a phone hands-free kit (see 5.6).
Make a phone call, speak loudly and adjust the IN Level / PHONE knob until the LED flashes sporadically.
- AUX IN: To use this input you need to install the DRC (optional).
Through the DRC select AUX (see 10).
- If a source with a CD player is connected to the AUX input, disconnect the bit Ten outputs from the amplifiers
and proceed as detailed in chapters 6.1.3 - 6.1.4.
- If the source to be connected to the AUX IN input has no CD player (e.g. mp3 player), you can calibrate by listening.
A - Connect the bit Ten RCA inputs (AUX IN) to the head unit output.
B - Play a music track.
C - Turn the IN Level / AUX knobs until the first distortion symptoms appear. Check if the IN Level / AUX LEDs
flash occasionally.
1. Amplifiers sensitivity calibration by listening.
 •Placetheheadunitvolumewherethebit Ten inputs were calibrated and play a highly dynamic track.
 •Workontheamplifierssensitivitycontrolsslowlybringingthemtohighersensitivity(lessthan4.0Volts).
Once the first distortion symptoms show you should stop. This is easier if you work on one channel (stereo)
at a time by disconnecting the other channels / amplifiers inputs.
 •Oncetheamplifiersarecalibrated,reconnectallthesystemchannelsand,ifnecessary,reducethesensitivity
(back to 4.0 Volts) of those channels that may have excessive volume.
2. Amplifiers sensitivity instrument calibration.
For instrument analysis, you will need an oscilloscope.
 •Disconnectallspeakersfromtheamplifiersifalreadyconnected.
 •Playtrack1ofthe bit Ten CD. All source controls must be flat (0).
The volume control should be placed on the bit Ten input calibration level.
 •Connecttheoscilloscopetoanamplifieroutputchannel.
The video will display a sine wave with variable frequency (sweep).
 •Turnthesensitivitycontrolinbothdirectionsuntilthesinewavelooks
slightly cut at both ends.
 •Repeatforeachamplifierchannel.
 •ReconnectthespeakersandinsertaCDwithamusictrack.
Reduce the sensitivity (by turning the knob toward 4.0 Volts)
of those channels that may have excessive volume.
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