Alpine R2-A75M User Manual

ALPINE R2-A75M/R2-A60F 68-44781Z33-B (EN/DE/FR/ES/IT/SE/RU/CS)ALPINE R2-A75M/R2-A60F 68-44781Z33-B (EN/DE/FR/ES/IT/SE/RU/CS)
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Auto Turn-on Switch
a) For the “DC” Input setting,
connecting the Remote Turn-On
Lead is not required due to the
“REMOTE SENSING” function of
this product.
b) However, the “REMOTE SENSING”
function may not work correctly
depending on the signal source
connected. In such a case,
connect the Remote Turn-On
Lead to an incoming power
supply cord (accessory power) in
the ACC position and switch to
the “REM” Input setting.
• The DC offset auto turn-on circuit was
designed to work with ONLY high level signals
(i.e., speaker level signals). These high level
signals usually come from the amplified
output of radios, head units, and amplifiers.
Because LO signal input (i.e., low level signals)
cannot turn on the amplifier, the REMOTE
trigger signal must be supplied and the REM
setting needs to be used for LO signal input.*
∗ For details on turning on the unit with the
ACC trigger signal, see the Remote Turn-On
Lead (
) section (page 5).
Input Level Switch
a) If input is via the head unit
pre-out line using an RCA
extension cable (sold separately),
set to “LO”.
b) If input is via the head unit
speaker line using a speaker-RCA
conversion cable (sold
separately), set to “HI”.
Subsonic Filter Adjustment Knob (R2-A75M
only)
The subsonic filter is for cutting ultra low
frequencies from the input signal before being
amplified. Frequencies lower than the specified
frequency are attenuated at 24 dB/octave.
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.
Crossover Frequency Adjustment Knob
(LP FILTER) (R2-A75M only)
Use this control to adjust the crossover
frequency between 50 Hz to 400 Hz.
Bass EQ Adjustment Knob (R2-A75M only)
Add a 50 Hz bass boost up to +12 dB to tune
your bass response.
Input Gain Adjustment Knob
Set the R2-A75M/R2-A60F 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.
Filter Mode Selector Switch
(CHANNEL-1/2) (R2-A60F only)
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 “HP” position when the
amplifier is used to drive a tweeter/
midrange system.
At this setting, Crossover Frequency
Adjustment Knob ( ) provides
adjustment between 50 Hz to 400
Hz. 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.
c) Set to the “LP” position when the
amplifier is used to drive a
subwoofer.
At this setting, Crossover Frequency
Adjustment Knob ( ) provides
adjustment between 50 Hz to 400
Hz. The frequencies above the
crossover point will be attenuated
at 12 dB/octave.
SWITCH SETTINGS
• Before switching each Selector Switch, turn off the power and insert a small screwdriver, etc.,
perpendicularly to the Switch.
• To use the top inner panel, remove the top cover. See “REMOVING THE TOP COVER” (page 3).
R2-A75M
(Top inner panel)
R2-A60F
(Top inner panel)

Alpine R2-A75M Specifications

General

Brand	Alpine
Model	R2-A75M
Category	Amplifier
Language	English