Alpine alpine Manual Do Utilizador

 

ALPINE PDR-V75 68-25285Z56-A (EN/FR/ES)

NOTE:
•  Before switching each Selector Switch, turn off 

the power and insert a small screwdriver, etc., 
perpendicularly to the Switch.

a)  Set to the “OFF” position when the 

amplifier will be used for driving 
full range speakers or when using 
an external electronic crossover. 
The full frequency bandwidth will 
be output to the speakers with no 
high or low frequency attenuation.

b)  Set to the “ON” position when the 

amplifier is used to drive a tweeter/
midrange system. The frequencies 
below the crossover point will be 
attenuated at 12 dB/octave.

NOTE:
•  In this case the maximum Bass EQ 

boost level is reduced.

Use this control to adjust the crossover 
frequency between 50 and 400 Hz.

Set the PDR-V75 input gain to the minimum 
position. Using a dynamic CD as a source, 
increase the head unit volume until the output 
distorts. Then, reduce the volume 1 step (or until 
the output is no longer distorted). Now, increase 
the amplifier gain until the sound from the 
speakers becomes distorted. Reduce the gain 
slightly so the sound is no longer distorted to 
achieve the optimum gain setting.

a)  This switch setting is for selecting 

either 2-channel or 4-channel input 
mode. When set to “1/2”, signal will 
be copied from CH-1/2 and sent to 
CH-3/4, eliminating the need for 
Y-adapters.

b)  Setting this switch to “3/4” will keep 

both inputs, CH-1/2 and CH-3/4 
independent.
A 4-channel source is required for 
this mode.

The subsonic filter for cutting ultra low 
frequencies from the input signal before being 
amplified.
This is desirable for several reasons:

 

– To protect speakers too small or not capable 

of reproducing ultra low frequencies.

 

– To minimize power wasted from reproducing 

inaudible sound.

 

– To protect subwoofers in vented enclosures 

from over excursion below the tuning 
frequency.