1-Ohm Stable: The SPXL1000 is stable down to 1-ohm. The 1-ohm
output is 1750 watts RMS x 1 channel; the 2-ohm output is 1200 watts RMS x 1 channel.
Protection Circuitry: The amplifier offers three protection
circuits: short circuit (or too low an impedance on the outputs), thermal overload
(overheating), and incorrect voltage.
Multiple Amplifiers: Two identical SPXL1000 Competition
amplifiers can be strapped together to double the power to a single subwoofer.
When used in this configuration one amp is the master (controls gain, crossover
point, and bass boost), the other is the slave, and the minimum subwoofer
impedance is 2 ohms. The signal is transferred from the master to the slave via
a single RCA cable.
Wired Remote: The amplifier includes a wired remote control,
offering control of the bass output within easy reach of the driver. The remote
has a rotary knob and comes with mounting screws and a 16.5' connector cable (with
RJ-25 phone plugs on each end). The remote's approximate dimensions are:
- Width: 1-13/16" (2-5/8"
including the mounting tabs)
- Height: 1-3/8"
- Depth: 2-3/16" (2-5/8"
including the knob and wiring)
Gain: The rotary gain control is continuously variable from
0.2 volts to 6.0 volts to match the source signal.
Bass Boost: the bass boost circuit has adjustable gain and
center frequency (frequency at which the bass adjustment is centered):
- Gain: rotary dial; continuously
variable from 0 to 18 dB
- Frequency: rotary dial; continuously
variable from 40 to 120 Hz
Crossover: The built-in low pass crossover is always active.
The crossover point is continuously variable from 35 to 250 Hz.
Phase: The subwoofer phase is continuously variable from 0°
Master/Slave: Choose the master or slave mode if using two
SPXL1000 amplifiers together to power one subwoofer. The master setting is used
when not strapping two amps together.
Power: The power and ground inputs are set-screw terminals;
they will accept bare wire up to 2-gauge (HELIX recommends 4-gauge minimum) and
are tightened/loosened with the included 5mm Allen wrench.
Note: The amplifier is protected by two
80-amp fuses (160 amps total), but the amplifier wiring kits
in the accessory list include 150-amp fuses, and a larger
compatible fuse is not available. Optimally a different fuse
holder and a 200-amp fuse can be added, or the wire, fuse
holder, and fuse can be purchased separately. As a practical
matter, however, using the 150-amp fuse included with a wiring
kit is unlikely to present a problem.
Remote: The remote turn-on input is a set screw terminal; it
will accept bare wire up to 8-gauge and is tightened/loosened with the included
2.5mm Allen wrench.
Speaker Outputs: There are two pair of set-screw speaker
terminals, internally wired in parallel so you can easily connect two subwoofers.
The terminals accept bare wire up to 8-gauge and are tightened/loosened with the
supplied 2.5mm Allen wrench.
Line Input: A pair of gold plated stereo RCA jacks connect to
the output signal from the head unit.
Line Output: Stereo RCA output jacks make adding another
amplifier easy. The RCA outputs are full range and the setting on the SPLX1000's
built-in crossover have no effect on them.
Wired Remote: The cable for the included wired remote control
plugs into the RJ-25 Remote jack.
Master Output/Slave Input: A single RCA jack acts as an output
or an input (depending on the position of the Master/Slave switch) when two SPLX1000
amplifiers are strapped together to power one subwoofer.
Fuses: The amp is protected by two 80-amp maxi blade fuses.
Protect Bridge: When using two amplifiers in a master/slave
configuration and reproducing a 60 to 80 Hz test tone in an SPL competition, the
protection circuit can be disabled by connecting the Protect Bridge jacks using
the included jumper wire.
Note: The protection circuit should never
be disabled when playing music.