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except when operating at low levels. For
most applications the control should be
set between 0dB and +20dB.
A setting of 0dB on the SUBWOOFER
LEVEL control is the correct starting point
when setting up a sound system. From
there the sound can be adjusted for best
sound. The 0 dB mark refers to the setting
that will give full power when the line input
is used and the input signal is at a level
of +4 dBV. This also is the setting to give
a sensitivity of 2.83 Vrms (1 watt 8-Ohms)
for 100 dB spl when set for speaker level
input. With a typical full range companion
speaker this will give flat response. In either
line or speaker operation it will usually be
desirable to set the control at +3 to +6 to
give some bass boost at low power levels.
At levels approaching full power the built-in
limiter will automatically reduce the gain
to prevent over powering the subwoofer.
Operation with settings significantly above
+12 may clip the circuitry in the subwoofer
reducing the dynamics of the music.
Setting the subwoofer gain above +12 is
only appropriate at low operating level.
3. Input Ground Switch
The LS700P expects the source feeding
it to be grounded. A system comprised
entirely of ungrounded equipment may
cause the LS700P to hum or buzz. If you
have a buzz or hum problem, try setting
the switch to the "GROUNDED" position.
The switch should otherwise be left in
the "UNGROUNDED" position. Do not use
the grounded position with an amplifier
operating in bridged mode or when the
sleeve of the input signal is live.
4. Input Level Switch
A switch is provided to switch input levels
between speaker level and line level.
The switch should be set to speaker level
when the LS700P is fed from the output
of an amplifier or powered mixer. The
line level position is for when the LS700P is
fed a signal from a processor, electronic
crossover or the output of an unpowered
mixer. When using the line level mode the
use of balanced (Tip, Ring, Sleeve) cables
will reduce the sensitivity to hum and buzz.
5. Stereo Input and Parallel
Thru Jacks
For normal operation, connect the LS700P
just like an ordinary speaker, along with
the Full-Range speakers and set the Input
Level switch to SPEAKER. If the audio
source does not have a ground pin on the
AC cord, the Input Ground switch must
be set to GROUND (GND). The LS700P
may be plugged in before or after the
Full-Range speakers. Use the Left and
Right Inputs when using a single LS700P in
a stereo system. Use either the Left or the
Right inputs when using separate LS700P's
for each side (or when used in a Mono
system). The LS700P does not alter the
signal to the Full-Range speakers, and
will not draw any power from the host
amplifier driving them. Please note that an
external crossover is not necessary.
As well as accommodating the full
range speakers, the PARALLEL THRU jacks
allow many LS700Ps to be connected in
a string (or otherwise in parallel). There is
no practical limit to the number of LS700Ps
that may be connected together.
AT HIGH POWER LEVELS WHEN THE LIMITER IS OPERATING INCREASING THE SUBWOOFER LEVEL CONTROL WILL NOT
INCREASE THE OUTPUT. DO NOT INCREASE SETTING WHILE OPERATING AT HIGH LEVELS.
USER NOTE:
This Subwoofer may be driven from Speaker Level
or Line Level signals. If an élite processor is used,
this Subwoofer should be plugged into the SUB
output of the processor. The High–Frequency
Cutoff should be set to 150-Hz and the Input Level
should be set to LINE. For Line
Level operation a balanced (Tip
Ring Sleeve) cable should be
used. If the system is being
operated without a processor,
this Subwoofer can be
connected to the output of the
power amplifier as shown in the
diagrams and the
Input Level
should be set to SPEAKER. If
none of the equipment has a
U-ground, the INPUT GROUND
should be set to GROUNDED.
Otherwise the INPUT GROUND
should be set to the position that
best minimizes the hum.
Refer to the Owner's
Manual for other modes
of operation
+3
-3
+10
+30
+20
dB
LS700P
Yorkville
DESIGNED & MANUFACTURED BY YORKVILLE SOUND • TORONTO, CANADA
INPUT GROUND
INPUT LEVEL
LEFT
(mono)
RIGHT
HIGH
FREQUENCY
CUT OFF
125 Hz
POWER
100 Hz 150 Hz
SUBWOOFER
LEVEL
PARALLEL
THRU
INPUT
PARALLEL
THRU
INPUT
UNGROUNDED
GROUNDED
SPEAKER
LINE
0
1
2
3
5
4