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H8 DSP
Digital Interface Processor
6. HOW TO SETUP THE H8 DSP WITHOUT A PC
The H8 DSP can be used without a PC and in this case it will not be possible to use the sole the DE-EQ (de-equalization)
function to eliminate any pre-existing equalization in the OEM audio system.
The device will store the following default settings:
1.
Front and Rear stereo broadband inputs;
2.
AUX input ;
3.
OPTICAL Input
4.
2 Way Front + Rear + Center + Subwoofer
WARNING:
if a DRC is not installed in the system the H8 DSP is set up with the volume adjustment to the maximum
acoustic level. Connecting the processor without performing the required adjustments may lead the system
to play at full power causing a strong acoustic noise and damaging the speakers.
6.1
HOW TO CALIBRATE THE MASTER FRONT-REAR INPUT SENSITIVITY
1.
Connect the head unit speaker outputs to the H8 DSP high-level input
make sure the amplifiers RCA plugs are disconnected from the H8 DSP to avoid speaker damage during the
calibration procedure.
The input calibration procedure must be performed with the ignition turned on. In this case, the car voltage is about
14.0 Volts. The head unit will provide an undistorted output signal at higher volume.
2.
Make sure that the IN Level knobs for the inputs used (L / R Front, L / R Rear, Aux IN L-R) are set to minimum sensitivity
as in the figure (position -).
3.
Turn on the device and play track 1 of the CD supplied with the H8 DSP.
• Set all tone controls to zero (flat).
• Set balance and fader to center.
• Adjust the head unit volume to the maximum undistorted output level.
• If the head unit features an adjustable equalizer, make sure that the controls are set to zero (flat).
WARNING:
the head unit level must be elevated to the maximum undistorted level. If the head unit distortion level
can not be tested in advance, adjust the volume to approximately 80% of its maximum. If the head unit
output level is set too low, the device will produce ground noise (hissing sound) when playing music tracks.
This is due to the low signal / noise ratio provided by the head unit to the H8 DSP input. If you have this
problem after you calibrated the amplifiers sensitivity
the H8 DSP calibration procedure as detailed in the following paragraph 4.
Head unit input-level instrument check.
You will need an oscilloscope for this instrument check.
• Connect the head unit output to the oscilloscope.
• Play track 1 of the H8 DSP CD.
• Set tone, fader and balance controls and the equalizer (if any) to zero (flat).
• Turn on the car.
• Adjust the volume control so that the oscilloscope shows a sine wave with
slightly cut peaks, as shown in the figure.
• Note down the volume used by the head unit. It must be left in this position
for the following
(Vedi 5.7)
(see 8.1.21)
User's manual
. Before turning on the system,
(see 4.2-5.4)
, increase the head unit volume and repeat
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