1-Ohm Stable: In stereo mode the amplifier is stable down to
1-ohm. The 1-ohm output is 395 watts RMS x 2 channels; the 2-ohm output is 270
watts RMS x 2 channels.
Bridgeable: The A 2 can be bridged to one channel, outputting
540 watts RMS x 1-channel into 4 ohms and 790 watts RMS x 1-channel into 2 ohms.
Protection Circuitry: The amplifier offers three protection
circuits: short circuit (or too low an impedance on the outputs), thermal overload
(overheating), and incorrect voltage.
Temperature Controlled Power Supply: The amplifier's temperature
controlled power supply reduces the output power at very high temperatures, protecting
the amplifier from damage, as well as avoiding turning off completely due to overheating.
This power reduction is not typically audible and happens only at power peaks when the
amplifier gets very hot due to high ambient temperatures.
Gain: The amp's two channels have independent rotary gain controls,
continuously variable from 0.5 volts to 8.0 volts to match the source signal.
- Mono: two channels output a monaural
signal; only the A input is used (the inputs are
labeled A and B, not left and right)
- Bridged: one channel output; both
inputs are used and summed to a single speaker
- Stereo: standard two channel stereo;
both inputs are used
- Crossover Mode: select High Pass, Full
Range, or Low Pass/Band Pass (when the crossover mode switch
is in the low pass/band pass position, both the high pass and
low pass crossovers are active, creating a band-pass crossover
with a lower limit as low as 15 Hz)
- Frequency Range: the high pass and low
pass crossovers have independent, three position range settings;
select 15 to 80 Hz, 80 to 700 Hz, or 650 to 6000 Hz
- Frequency Setting Adjustment: within
the selected frequency range, the high pass and low pass
crossovers have separate, continuously variable rotary
dials to set the specific crossover frequency
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 9 dB
- Frequency: rotary dial; continuously
variable from 30 to 120 Hz
Power: The power and ground inputs are set-screw terminals;
they will accept bare wire up to 4-gauge (HELIX recommends 4-gauge minimum) and
are tightened/loosened with the included 4mm Allen wrench.
Remote: The remote turn-on input is a set screw terminal; it
will accept bare wire up to 12-gauge and is tightened/loosened with the included
1.5mm Allen wrench.
Speaker Outputs: The speakers connect to two pair of set-screw
terminals; they accept bare wire up to 10-gauge and are tightened/loosened with the
included 2.5mm Allen wrench.
Line Input: A pair of gold plated stereo RCA jacks connect to
the output signal from the head unit.
Fuse: The amp is protected by four 20-amp mini blade fuses
mounted under the top cover.
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