Table of Contents
Advertisement
MAN-PRS-D400-GB.fm Page 10 Tuesday, February 21, 2006 3:43 PM
Additional information
• This unit is equipped with a protective function to prevent malfunction of the unit
itself and speakers from too much output, improper use or improper connection.
• When outputting sound at high volume etc., this function will cut off the sound output
in a few seconds. But this is not a malfunction. When you turn down the volume of
the head unit the sound output will be restored.
• If sound output is cut, the gain control of this unit may be improperly set. To ensure
continuous sound output at increased volume of the head unit, set the gain control
of the amplifier to a proper position according to the preout maximum output level of
the head unit (Fig. 1). There is no need to decrease the volume of the head unit and
too much output is controlled (Fig. 2, Fig. 3).
• If you decrease the volume of the head unit and set the gain control of the amplifier
to the proper position but still the sound cuts out from time to time, contact the
nearest authorized PIONEER Service Station.
Preout level: 4 V
Preout level: 6.5 V
Fig. 1 Gain control of this unit
Power
Head unit volume steps
Preout level: 2 V
If you raise the gain of the amplifier to an improper level, only distortion is increased
(Standard: 500 mV)
Fig. 2
Normal gain
Signal
waveform
Amplifier gain
With high output the signal waveform is distorted, if you raise the gain of the amplifier
Fig. 3
Power
Normal gain
Equal power
Head unit volume steps
Amplifier gain
(normal)
and the power increases only slightly.
Relationship between the gain of the amplifier and the output power of the
head unit
Equal power
waveform
(normal)
the power changes only slightly.
Signal waveform when outputting at high volume by the gain control of the
amplifier
10
Maximum gain
Amplifier gain
(maximum)
Maximum gain
Signal
Amplifier gain
(maximum)
Advertisement
Table of Contents
