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2-Ohm Stable: In stereo mode the amplifier is stable
down to 2-ohms. The 2-ohm output is 120 Watts RMS x 2 channels.
Bridgeable: The B TWO can be bridged to one channel, outputting
200 Watts x 1-channel into 4 ohms.
Protection Circuitry: The B TWO offers four protection circuits:
short circuit (or too low an impedance on the outputs), thermal overload, over voltage,
and under voltage.
Crossover: The built-in crossover has a three position switch
to select the crossover operation as high-pass, full-range, or low-pass. The high-pass
crossover point is continuously variable from 15 Hz to 4 kHz. The low-pass crossover
point is continuously variable from 40 Hz to 4 kHz.
Note: When the crossover switch is in
the low-pass position, the high-pass frequency dial is also
active. Depending on the high-pass frequency setting, this
creates either a subsonic filter (useful for any subwoofer
and often necessary for ported enclosures) or a band-pass
crossover (with a lower limit from 15 Hz to 4 kHz, and an
upper limit from 40 Hz to 4 kHz).
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 is centered at 45 Hz and
continuously variable from 0 dB to +18 dB.
Power: The power and ground inputs are set-screw terminals;
they will accept bare wire up to 4-gauge (HELIX recommends 8-gauge minimum) and
are tightened/loosened with the supplied 4mm Allen wrench.
Remote: The remote turn-on input is a set screw terminal; it
will accept bare wire up to 10-gauge and is tightened/loosened with the supplied
2mm 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
supplied 2mm Allen wrench.
Line Input: Stereo RCA jacks connect to the output signal from
the head unit.
Speaker Level Input: Use the included harness when speaker
level inputs are needed, or use the HELIX Easy Plug Cable and vehicle specific
adapter harness (both sold separately, see explanation above).
Note: The included speaker level input harness
doesn't use the standard aftermarket color codes, and there's
no color key in the manual (although the pin positions are
labeled on the side of the amp). The colors used are:
- Gray: channel 1 negative
- Red: channel 1 positive
- White: channel 2 negative
- Blue: channel 2 positive
Line Output: Stereo RCA output jacks make adding another
amplifier easy. The settings on the built-in crossover have no effect on the
Fuse: The amp is protected by a single 30-amp ATO-type