JBL SP MKII User Manual page 28

crossover is centered at 80 Hz. A switch on the rear panel of the SP MK II engages the
crossover. When disengaged, the left and right front channel audio outputs operate full
range but the subwoofer outputs still remain active.
SURROUND ELECTRONIC CROSSOVER: Some listeners may prefer some bass
extension in the surround channel particularly with some music surround settings. The
main surround outputs have a rolloff below 80 Hz at 12 dB/octave. A mono subwoofer
surround output is provided. A small woofer (8" to 10") with a response to 40–50 Hz
may be desirable for use in some environments. A switch on the rear panel of SP MK II
(adjacent to the front channel crossover) switches in the surround electronic crossover.
When using Home THX–certified dipolar surround speakers, be sure the electronic
crossover is engaged, even if you aren't using a subwoofer. This will prevent overload
of the dipolar surround speakers by audio frequencies below 80 Hz. An output level
trim control for the surround subwoofer is located on the rear panel of the SP MK II.
TEST NOISE GENERATOR: The built-in noise generator sequences bandwidth-limited
pink noise around the room to each speaker location. The duration of the noise burst is
limited to two seconds in the Dolby Pro Logic and Home THX Cinema modes. The dura-
tion is extended to approximately four seconds in the other surround modes.
The trim controls, which can be adjusted by hand without the need for special tools, are
located on the rear panel of the SP MK II.
A switch on the rear panel (next to the electronic crossover switches) eliminates the
noise burst to the side channel/front dipole driver outputs for use with a single pair of
point source-type surround speakers, or when using conventional THX dipolar speakers.
PANORAMA: This feature, accessible via the remote, adjusts the width of the stereo
stage. Some recordings may not have enough stereo separation, and may sound
monophonic. Other recordings may have too much separation and sound exaggerat-
ed. Adjusting the panorama circuit to widen or narrow the stereo stage will correct
most recordings. When the panorama button on the remote control is engaged the liq-
uid crystal display will provide an indication of the amount of correction.
MUTE: This function totally mutes the output of the SP MK II.
CENTER BOOST: This function, accessible via the remote, increases the output level
of the center front channel by 3 dB. Pushing the Center Boost button a second time
restores center front level to normal. Center boost may be required when listening to
some film tracks with non-THX speakers.
SOURCE SELECT: This function, available via the remote and the front panel of the
SP MK II, selects the desired A/V input.
RECORD SELECT: This function, available only from the front panel of the SP MK II,
selects the A/V source for recording purposes or to be viewed at a secondary location.
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