JBL PRX515 User Manual page 17

SYSTEM SET UP - SUBWOOFER
3 - LEVEL:
Sound level adjustment. The 12 o'clock position is a good starting point for most usages.
Once the full-range system has been connected the level can be varied to match and deliver the
desired balance (for details see Setting the Gain on page 19).
6 - POWER SWITCH:
Turns the power on. Power "on" status is indicated with the illumination of the
logo on the grille.
7 - LINE SELECT:
Allows the user selection for different local voltage ratings.
8 - AC LINE INPUT:
Standard IEC AC mains input connector.
Indicators:
4 - SIGNAL:
Signal indicator. The green LED illuminates when a signal is present at the input connector.
5 - OVERLOAD:
The red LED illuminates when the system overload protection is active. If the input signal is too
strong or the "LEVEL" control set too high, the red LED will illuminate constantly. Illumination of the
"OVERLOAD" LED can be avoided by reducing the input level or turning down the "LEVEL" control
to the point at which the red LED occasionally flickers.
Connectors:
9 & 11 -
XLR / 1/4 inch phone jack balanced input connector (see Reference section page 22 for information).
10 & 12 -
XLR male balanced output connector. This connector provides a full-range or high-passed signal.
dependent on the setting of the "XOVER" switch. In addition to connecting a full-range system to the
output, it's also possible to daisy chain subwoofers together.
Note3:
A single subwoofer can be used with a stereo source. The integral differential circuits sums the low frequency
information from the left and right channel to a mono signal, ready for reproduction by the subwoofer.
PRX500 amplifier input configuration for
PRX518S Subwoofer model:
Features:
1 - XOVER IN / OUT:
Pressing this button
engages a high-pass filter at 110 Hz. This 4th
order active filter allows a smooth transition
between the subwoofer and a full range speaker
connected to the output connector.
2 - POLARITY INVERT:
Allows you to set the
polarity of the subwoofer to either 0° (no change)
or 180° (inverse polarity). The correct polarity
setting will produce the best blend between the
subwoofer and the full-range speaker and the
strongest perceived bass response at the
listening position. This is especially useful when
the subwoofer is placed at a different distance
from the listening position than the full-range
speakers. If the bass response seems weak
try inverting the polarity.
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