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THIS SWITCH IS OVERRIDDEN IF THE CONTOUR/BYPASS SWITCH (20) IS IN THE BYPASS
MODE. THE ASSOCIATED LED (21) WILL REFLECT THIS CONDITION.
The Contour/Bypass switch (20) provides a flat response in the "Bypass" or “in” position. The "Contour" or
“out” position allows the positions of the other two DynaQ
™
switches to affect the tone. This switch overrides
the other two switches in the DynaQ section, as the other two switches have no effect when in Bypass mode.
When the Contour/Bypass switch is pushed in and is in Bypass mode, the LED (21) to the upper right glows
Red. If either of the other two DynaQ switches (18,22) are engaged, the associated LED’s (19,23) go out to
indicate that their function has been bypassed.
THE BASS ENHANCER/BYPASS SWITCH (22)
Provides a dynamic bass boost that is signal level dependant (Fletcher-Munson type compensation) when in the
"Bass Enhancer" or “in” switch position. When in the "Bypass" or “out” switch position, the low frequencies
are reproduced in a nominally flat manner.
When the "Bass Enhancer/Bypass" switch is pushed in, and the "Bass Enhancer" mode is engaged, the LED
(23) to the upper right glows Green.
THIS SWITCH IS OVERRIDDEN IF THE CONTOUR/BYPASS SWITCH IS IN THE BYPASS MODE OR THE MUSIC/
SPEECH BUTTON IS IN THE SPEECH MODE. THE ASSOCIATED LED WILL REFLECT THIS CONDITION.
If full Fletcher-Munson type dynamic bass and treble boost were desired, then the switch settings would be:
Music/Speech switch (18): Music mode (button Out, LED dark)
Contour/Bypass switch (20): Contour mode (button Out, LED dark)
Bass Enhancer/Bypass switch (22): Bass Enhance mode (button In, LED lit green)
Then a single push of the Contour/Bypass switch (20) can restore the speaker to nominally flat response,
while with the same starting point settings, a single push of the Music/Speech button (18) can provide a
Speech contour with no Fletcher-Munson type contouring and with roll-offs at the frequency extremes.
SLEEP SWITCH (24)
Located above the LINE OUT section, the Sleep switch (24) provides a means to disable the automatic power
off Sleep feature so that the Impulse
®
12D remains on at all times. The automatic power off Sleep feature is
disabled when the switch is in the “out” position, it is engaged when the switch is in the “in” position, and the
indicator LED (25) to the upper right of the switch will glow green.
When no signal is present at any of the inputs for approximately 16 minutes, the automatic power off Sleep
function will shut the power off to most of the electronics in the Impulse
®
12D. The unit will turn back on if a
signal is applied, but it will take a few seconds for the Impulse
®
12D to start producing sound. This is due to
the soft-start circuit, which ensures that the switching power supply is consistently reliable and functional.
A disable function is provided in case the delay between the application of audio and the normal output of
the Impulse
®
12D is not acceptable to the user. The Sleep function will “wake-up” the Impulse
®
12D after an
indefinite time period, provided AC power is still present.
Note that when in Sleep mode, all LED’s on the rear panel will be dark. If the front logo LED switch (17) is in the
Signal or Power position, the glowing front logo LED will indicate the unit's AC power status. If the front logo
LED switch is in the “Off” position, there will be no indicator lights active when in Sleep mode.
LINE OUT SECTION (D)
Line Out is intended to link multiple Impulse
®
12D’s in a line or to provide a feed to a powered subwoofer or
other electronics that need to receive a full range version of the input signal. The connectors available are a
3-conductor Euro-style jack connector (26), a ¼” TRS phone jack (27), and a male XLR jack (28). The output
level is controlled by the gain controls (13,14) for input 1 and input 2, and is the sum total of any signals present
at inputs 1 and 2.