Adjustment Of The Electronic Crossover; Operation Mode Switch; Highpass Crossover Freqzency; Lowpass Crossover Frequency - Spectron SP-N1507 Bedienungsanleitung

ADJUSTMENT OF THE ELECTRONIC CROSSOVER

OPERATION MODE SWITCH

The operation mode of the amplifier can be set over the operation mode switch "Crossover"
or "Lowpass". This setting must be matched with the speaker pair that is driven by the
respective channel(s), LP, HP or FULL are possible settings.
If the speaker system driven by the corresponding channel pair is a component-, coaxial- or
triaxial- type, select HP (highpass filter). Else, if a subwoofer is connected, the operation
mode switch must be set to LP (lowpass filter). If the speaker system connected shall not
receive a filtered signal, select FULL.
Highpass or lowpass filtering helps the connected loudspeakers to work in the frequency
bands they can reproduce best, by reducing mechanical excursion.
HIGHPASS CROSSOVER FREQUENCY
For any kind of mid/high range speakers like coaxial or component sets, set the operation
mode slide switch to HP and proceed to adjust the "Highpass" or "High" potentiometer,
to the x-over frequency that matches the size of the speakers connected. This setting is
always a compromise and must be "played by ear", since either midbass reproduction or
power handling will have to be sacrificed to a certain extent! If the highpass crossover
frequency is set too low, the speakers will be mechanically overdriven by low volume levels.
If the highpass frequency is set too high, too much mid/bass is cut off and the music will
sound thin.

LOWPASS CROSSOVER FREQUENCY

Set the operation mode switch "Crossover" or "Lowpass" to the LP position, to drive a sub-
woofer system connected to the amp.
The lowpass crossover frequency should also be played by ear, i.e. since this crossover
frequency point is mostly a matter of personal taste and also depends on the vehicle dimen-
sions. A good rule of thumb would be to set the LP around 60 to 90 Hz, as this will usually
render best sonic results. In general, setting the lowpass crossover frequency point too low,
will result in a bass that sounds very low but weak, whereas adjustment of the LP frequency
too high will result in a 'booming' bass as well as strongly reduced low end extension.

INPUT GAIN CONTROL

Before you proceed to adjust the input gain levels of the amp(s) mounted to your car, all
tone controls (Bass, Mid, Treble, Loudness etc.) and the fader on the headunit must be set
to their neutral or center positions.
Turn all input gain controls of the installed amplifiers counter-clockwise to their minimum
positions and ALWAYS start with the channel pair that drives the subwoofer system first
(where applicable).
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Set the volume control of your head-unit to approximately 3/4 of full volume, while play-
ing a dynamic track with good bass content. Slowly increase the input gain control of the
channel pair driving the subwoofer(s), by turning the input "Level" potentiometer clockwise
until you can just hear distortions to start. Reduce the main volume level of your headunit
to a medium listening level and continue to set the remaining input gain levels accordingly.
Usually the sequence of the input gain adjustment procedure is > subwoofer > speakers in
the front doors > speakers in the rear of the car.

BASS BOOST

The bass boost potentiometer allows to increase the bass content of the music signal with
a center frequency of 45 Hz. The maximum bass boost level is 12 dB – thus careful adjust-
ment of this potentiometer is mandatory, as the amp may be overdriven into clipping easily.

SUBSONIC HIGHPASS

The SP-N1507 features a subsonic filter function. With this function enabled, infrasonic
signal content can be cut off between 15 and 50 Hz, with 12 dB/oct. This function can
improve the power handling of smaller subwoofers where chassis dimensions is smaller
than 10"/25cm, or the subsonic highpass does also help to deal with music playback that
contains a good deal of ultra low frequency information by default.
BASS LEVEL REMOTE CONTROL
If you want to deploy and use the bass boost remote control of the SP-N1507 amp, make
sure to adjust the control knob of the remote control to its full volume (clockwise) position,
before you adjust the input gain of your SP-N1507 subwoofer amplifier.
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