4
5
Input Section
Because of the wide range of head unit output configurations all ARC Audio amplifiers
have an adjustable input sensitivity or “Gain”. The gain is not a volume or a power
limiting control like a throttle. It makes the amp more sensitive to input from the stereo.
With the gain up the amp will reach full output at a lower volume setting on the deck. At
higher gain settings the amp also becomes more sensitive to noise from the car’s
electrical system. Try to run the gain at the lowest setting possible for you system.
There is no correct gain setting. Because
speakers require different power demands to
reach the same output, the gains most often
need to be used to compensate for these
differences. If you tried to set all the gains at half
way you would probably find the system didn’t
sound very good. Using good judgment and
listening carefully to each speaker is still the
best way to tune a system.
Crossover Controls
A crossover is a device that removes unwanted frequencies from a speaker or
amplifier. A tweeter can easily be destroyed by bass notes if they are not filtered out.
Likewise a subwoofer will not sound natural if it is playing midrange notes. A
crossover removes these sounds from the speaker. As you might guess, careful
adjustment is need to ensure that all the speakers are playing the right sounds and
that you are left with no
“holes” or low spots in the
frequency response.
Bass Boost
This amp has an adjustable bass boost. On the 4 channel KS 300.4, the Input Source
Select has 3 options. In “4 CH.” or “2 CH” the Bass Boost will be directed to the front
speakers. In “2 CH.BB” The Bass Boost will be sent to all 4 channel equally. Begin your
adjustments at low volume. If you do not hear
any improvement then the woofer does not
need any boost.
Use Bass Boost carefully. The demands on
power output are tremendous. Try to minimize
the use by changing woofer position or the
enclosure size.
Input Mode Switch
All ARC Audio amplifiers include an input mode switch. This switch controls the signal
being sent to the amplifier sections. Most 2-channel amplifiers can be bridged into a
single channel however if the signal to the channels is not exactly the same the
distortion will increase significantly. The mode switch solves this problem by offering 3
modes of operation.
Stereo
This is simple 2 channel stereo operation. Use this setting for most applications that do
not involve bridging the output.
Bridge (R IN)
On a 2-channel amp only the Right channel input will be split and sent to both outputs.
On a 4 channel the Right RCA Front will be sent to the front outputs. The Left Front RCA
will be sent to the rear outputs. This is a great way of get high power to a component set.
The amplifier now acts like a 2 channel that makes full power at 4 ohms.
L+R SUM MONO
This is the mode for bridging a subwoofer. Both the
left and right channels are combined into a mono
signal that is then split and sent to both output. This
will give you a true mono output.
KS 600.2
R
MIN
2
BRIDGED
MIN
4
L
MIN
2
4 X 30 AMP MAX
+12V
GND
TURN-ON
ARC AUDIO INC., USA
KS 600.2
POWER
\PROTECT
X 10
X 1
BASS
BOOST
0
15
dB
R
L
INPUT
HIGH
FULL
LOW
FREQ Hz
55
110
550
330
FREQ
RANGE
L + R
MONO
STEREO
BRIDGED (R IN)
REMOTE
LEVEL - LOWPASS
GAIN
MIN
MAX
INPUT
LEVEL
SPEAKER
PERAMP
AUTO
SENSE
OFF
ON
R
L
INPUT
INPUT
LEVEL
SPEAKER
PERAMP
AUTO
SENSE
OFF
ON
SET SENSE
TO “ON”
SET INPUT LEVEL
TO “SPEAKER”
LEFT
SPEAKER
IN
RIGHT
SPEAKER
IN
Output to
next amplifier
TURN ON
AUTO SENSE
The KS 600.2 uses a Patent Pending Auto Sense Turn-on circuit that offers a significant
improvement in reliability over previous designs. Instead of relaying on the music to supply
enough signal to turn the amplifier on. Robert Zeff’s new design detects the IC (chip) used
in the vast majority of stock head units and amplifiers.
When using the auto sense feature the remote input on the power strip becomes a remote
output reversing the remote turn-on connection to turn on the rest of your amplifiers?
