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 re-
fers 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 sub-
woofer 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 oth-
erwise 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 be-
tween 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 pow-
ered mixer. The line level position is for when the
LS700P is fed a signal from a processor, elec-
tronic 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 speak-
ers, 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 practi-
cal 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.
INPUT GROUND
INPUT LEVEL
LEFT
(mono)
RIGHT
HIGH
FREQUENCY
CUT OFF
125 Hz
POWER
100 Hz
150 Hz
SUBWOOFER
LEVEL
PARALLEL
THRU
I
N
P
U
T
PARALLEL
THRU
I
N
P
U
T
UNGROUNDED
GROUNDED
SPEAKER
LINE
-5
-10
+10
+24
+20
dB
0
1
2
3
5
4
