1. Full Range/Biamp switch
(SCx1112, SCx1115, SCx1253)
Slide switches to the full range position when using a single amplifier delivering
a full range signal, the internal passive crossover network divides the signals to the
appropriate drivers. replace the rubber plug to seal the cabinet.
Slide the switch to the BIamp position when using external active crossover and
multiple amplifiers in a bi-amp configuration. The BIamp position bypasses the
internal passive crossover network. replace the rubber plug to seal the cabinet.
for the 3-way SCx1253, the mid-High is driven by one amp and the dual 15” drivers
by another.
2. Full Range/cRossoveR switch
(SCx1118)
use the CrOSSOVer position to engage the internal low-pass Crossover network.
(150Hz, 6dB/oct.)
Slide the switch to the full range position when using an amplifier driven by an
external active crossover, the internal passive crossover network is bypassed.
replace the rubber plug to seal the cabinet.
3. twist-loc Full Range / Biamp input
This input can be used for full range or Biamped Input.
4. twist-loc thRough
This jack is wired in parallel with the full range input jack for daisy chaining additional
enclosures. all 4 pins are connected in parallel with the Input.
5. 1/4” input
use this input when using a single amp configuration. ensure switches are in full
range position.
6. 1/4” thRough
This jack is wired in parrallel with the 1/4” input jack for daisy chaining additional
enclosures. ensure switches are in full range position.
scx1118a contRol panel
1. input/thRu output
use the balanced Xlr or 1/4” connectors featured
on the rear control panel to connect to your mixer. using a balanced source will
reduce noise which may be picked up by the cable. You may DaISY-CHaIn as many
systems as you wish. all connectors are wired in parallel, however if the HI paSS
switch is used the THru range will be set by the CrOSSOVer freQuenCY switch.
2. level contRol
The leVel control adjusts the output volume. Start
by setting the leVel at “0”. Weak input signals can be boosted by setting the
leVel at “+6”. Strong signals can be reduced by turning the leVel toward
“-12”. The reD leD will flash if the internal power amps start to clip. Turn the leVel
control down to avoid clipping. Damage to the drivers can result from operating at a
level where the reD ClIp leD is constantly illuminated.
3. poweR/pRotect/clip inDicatoRs
power up your audio
source first, then turn on the powered sub. When the system is active, the leD will
indicate Blue. When shutting down turn off the powered sub first, then turn off
the mixer. If any of the power amps are clipping, the leD will indicate reD and you
should reduce the input level. If the system should go into protect mode, the leD will
indicate YellOW and the power amps will shut off. This may occur if: a) the system is
overheated due to clipping the power amps for an extended period of time, b) one of
the internal drivers developed a short, or c) the power amp requires service.
4. poweR switch
push this switch to the up position to apply power to the
unit. The pOWer leD will light to show the system is on.
5. ac poweR
use a standard grounded aC cord. Whenever possible, use
dedicated circuits for powered speakers.
6. cRossoveR Bypass switch
The crossover bypass switch bypasses
the internal active crossover allowing the use of an external active crossover.
7. cRossoveR FRequency switch
The CrOSSOVer freQuenCY
switch selects the internal crossover point. The 120Hz (swich out) setting is generally
used with small to mid sized speakers in your setup. The 80Hz (switch in) setting is
generally used with mid to large speakers. The SCx1112 is usable with either setting
depending on preference, but 80Hz is recommended for use with the SCx1115 and
SCx1253 to eliminate muddiness in the 120Hz range from multiple sources.
8. hi pass output switch
The hi pass output switch changes the
output of the Xlr thru output from a parallel of the Input Xlr to a hi pass (all
frequencies above) the crossover switch setting. This is good for going to a top
cabinet that can not handle the sub’s low frequencies.
Carvin’s
SCx1118A
powered sub takes the guesswork out of selecting the
ideal power source to drive your subwoofers. Designed to handle the most
demanding applications, the amplifier is perfectly mated with the subwoofer
and enclosure, creating an optimally designed system. The
SCx1118A
pow-
ered system makes setup and operation easier as well, with less gear to haul.
feed your mixer’s output directly to these loudspeaker systems, and you’re
ready.
choosing the coRRect ampliFication
SCx loudspeakers are designed to be used with professional power amplifiers capable
of producing the correct power into equivalent speaker loads. Care should be taken to
avoid amplifier clipping. Due to the fact that music signals have a high peak-to-average
“crest” factor, a lesser power amplifier driven into clipping is more likely to damage a
speaker than a higher power amplifier used within its ratings. When an amplifier is over
driven, its output waveform is clipped or squared off reducing the crest factor. If an
amplifier is extremely over driven, the output waveform can approach that of a square
wave. under these extreme conditions, an amplifier is capable of producing far more
power than its un-distorted rated power output.
Carvin recommends an amplifier capable of producing at least the power rating, up to
1.5 times the power rating of the speaker. (See TeCHnICal SpeCIfICaTIOnS).
The use of amplifiers with outputs greater than this is not recommended.
always turn on the amplifiers after the mixer and control systems have been powered
on. This will eliminate power peaks due to switch on surges which can damage
loudspeakers. When powering down the system, reverse the sequence and switch off
the power amplifiers first.
Connection Plates
4
5
6
2
8
7
3
1
scx1118a poweReD suBwooFeR
4
1
3
5
6
4
3
5
6
2
CONNECTING SCx PASSIVE SPEAKERS
The rear panels of the the SCx passive loudspeakers are fitted with both 1/4”
and 4-pin twist-loc connectors. all connectors are wired in parallel. The twist-loc
connection must be used for BIamp.
4 pin
Bi-amp
Passive Subwoofers
1+
low freq. positive positive Input positive Input
1–
low freq. negative negative Input negative Input
2+
High freq. positive Through
Through
2–
High freq. negative Through
Through
scx1118a
scx1112, scx1115, scX1253
scx1118
SCx1118A POWER AMP SPECS:
700w RMS Continuous/1400w Peak
THD less than .05% @ 90%, .1% at full power
Crossover: Active, 24dB/Octave @ 80 & 120 Hz
Protection systems: Short circuit, themal and Speaker Guard™ protection
Power Requirement: 120/240 VAC, 50-60Hz
