Audison bit Ten D Installation Guide download pdf (Page 17)

ADVANCED MANUAL / bit Ten D /

6.3 AMPLIFIERS SENSITIVITY CALIBRATION

6.4 HOW TO CALIBRATE THE PHONE AND AUX IN INPUT SENSITIVITIES

Once the bit Ten D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 D 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 D 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 D 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.

Amplifiers sensitivity calibration by listening.

 •Placetheheadunitvolumewherethebit Ten D 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.

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 D

CD. All source controls must be flat (0).

The volume control should be placed on the

bit Ten D

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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Audison bit Ten D Installation Guide Page 17

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