H8 DSP
Digital Interface Processor
User’s manual
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6
17
6.3
AMPLIFIERS SENSITIVITY CALIBRATION
6.4
HOW TO CALIBRATE THE AUX IN INPUT SENSITIVITIES
Once the
H8 DSP
input calibration or de-equalization (if any) procedures are complete, you can calibrate the amplifiers
sensitivity.
• Set the amplifiers crossover filters as desired and then connect them to the speakers.
• Connect the
H8 DSP
PRE outputs (CH1
÷
CH8) 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 AUX IN input.
AUX IN:
To use this input install the DRC (optional), or activate it through the specific AUX SEL wire
(see 4.4.4). (see 4.5.7)
.
-
If a source with a CD player is connected to the AUX input, disconnect the
H8 DSP
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
H8 DSP
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 on the
H8 DSP
inputs sensitivity calibration level 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 H8 DSP CD. All source controls must be flat (0).
The volume control should be placed on the H8 DSP inputs 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 the channels
that may have excessive volume.
