Hertz H8 DSP User Manual page 28

H8 DSP
Digital Interface Processor
20.
Software Startup
The settings selected during the guided procedure are transferred
to the processor main memory.
Once this operation is complete, a message confirming that the update
is complete will be displayed. Select OK.
We recommend to finalize the product and avoid losing data stored
during calibration
(see 8.5.3)
the main FILE menu.
21. Amplifiers sensitivity calibration.
Once the H8 DSP input calibration or De-Equalization (if any) procedures are complete, you can calibrate
amplifier's sensitivity. If you proceed according to the following procedure, you will achieve the best acoustic
results and eliminate any possible background noise
1. Connect the different amplifiers channels to the speakers.
2. Connect the H8 DSP PRE outputs (CH1÷CH8) to the amplifiers inputs using high quality RCA cables.
3. Set the amplifiers sensitivity of the various channels to about 4.0 Volts. Then proceed according to one of
the two following procedures
A. Amplifiers sensitivity calibration by listening.
• Place the head unit volume where the H8 DSP 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.
B. 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 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.
4. The flattening of the functional groups acoustic intensity obtained through the amplifiers sensitivity
calibration is an approximate adjustment. The H8 DSP applies the standard settings by default. After the
acoustic settings described in the following paragraphs are performed, you will be able to refine the
functional groups acoustic flattening by acting on the H8 DSP outputs
with the FINALIZE TO H8 DSP function, from
User's manual
CLIP
CLIP
.
(see 8.13)
8
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