Jensen PS1220M, Installation & Operation Manual

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PS1220M
8
Indicators and Controls
Power Indicator
The power indicator provides a visual indication that the amplifier is turned on.
Level
The input level control matches the output of your radio to the input of the amplifier. After the
installation is complete, make sure the input level control on the amplifier is turned down all the
way (counterclockwise or all the way to the left). Play a tape or CD (make sure bass and treble
settings or EQ are flat) and turn the volume up slowly until you just start to hear distortion. Back
the volume down just a bit. On the amplifier, slowly turn up the input level control (clockwise or
to the right) until you just start to hear distortion, and back it down a bit. Now your radio and
amplifier levels are matched.
Bass Boost
The Bass Boost is continuously adjustable from 0 to +18dB @ 45Hz. Adjusting the Bass Boost level
allows different subwoofer/enclosure combinations to be equalized. Use this control to increase the
level of low bass available from your subwoofer/enclosure combination. Ported and Band Pass
enclosures should be limited to about +6db to +9dB of boost. Sealed enclosures should be able to
accept the full +18dB of boost, if necessary. The full +18dB of boost should be reserved for special
applications because misuse of the Bass Boost could damage your subwoofers at high volumes.
Low Pass Filter (LPF)
These controls adjust the crossover point from 40Hz to 200Hz. Typical crossover is between
60Hz and 80Hz for ported and sealed enclosures. Bandpass boxes typically will use a higher
crossover setting between 125Hz to 175Hz. Depending on your sub-woofer/box combination
the crossover may be set anywhere between 40Hz and 200Hz. Since musical tastes vary, you
should play music that you will typically be listening to in your vehicle with the above settings as
a starting point and, if necessary, set the crossover by ear.
Protect Indicator
The protect indicator provides a visual indication that a problem exists and the protection
circuitry has protected the amplifier by shutting it down. Turn the system off and correct the
problem before turning the system on.
Thermal Protection
The amplifier will shut down if its termperature exceeds a safe operating level. The amplifier will
remain off until it cools to a safe operating temperature. Exercise care, as the exterior of the
amplifier may get uncomfortably hot to the touch before shutting down.
Overload and Short Circuit Protection
The amplifier will shut down if a short circuit condition exists or if electical current demands
exceed safe levels.
Remote Bass Control
Control Remoto de Nivel
Commande à Distance de Niveau
Remote Bass Control
Remote bass control allows the input level to be adjusted from an alternate location. It can be
mounted under-dash or in-dash. When the amplifier is used to drive subwoofers and the low
pass crossover is activated, the remote bass control can be used as a “remote bass level
control”. This enables you to control the bass level independent from the rest of the system. This
is convenient for system tuning and/or when playing many different types of music.
Control Remoto de Nivel
El control remoto de nivel permite que el nivel de entrada sea ajustado desde una ubicación
alterna. El mismo puede ser montado debajo del tablero o en el tablero. Cuando se usa el
amplificador para conducir los altavoces de bajos (subwoofers) y la sobremodulación de
pasabajos está activada, el control de nivel remoto puede ser usado como un "control de nivel
de bajos remoto". Esto le permite controlar el nivel de bajos, independiente del resto del
sistema. Esto es conveniente cuando se sintoniza o cuando se pasan diferentes tipos de
música.