About the Helix Blue B FOUR
Clean lines and solid power
Clean lines and solid power
German engineering and craftsmanship combine to create a sleek amplifier that'll make your vehicle come alive with crystal-clear, powerful music. The Helix Blue B FOUR 4-channel amplifier puts out 60 watts RMS each to your full-range speakers, both front and rear. Or, you can use the B FOUR in 2-channel mode to power a couple of subwoofers with up to 180 watts RMS each.
Made for high quality sound
The Helix Blue B FOUR amp starts with a noise-free input stage, then uses proprietary technology to achieve an incredible level of acoustic accuracy. The attention to detail extends down to the superior internal components, specially "surface-mounted" to double-sided, copper-plated circuit boards, all contributing to superb sound quality. A big, heavy wrap-around heatsink dissipates the heat for cool, reliable play.
B FOUR features
You'll find the tools you need to shape your sound. The wide range of the high- and low-pass filters allows you to adjust for the best possible performance from different types of speakers. A bass boost will add even more bang, if you want it to.
Amp for a Helix factory upgrade system
The B FOUR can also serve as an amp in a Helix Plug and Play factory upgrade system. You can use an EPC5 Easy Plug Cable and a Helix vehicle-specific adapter harness to plug your B FOUR directly into your vehicle's stereo to get its input signal, with no wire-cutting or splicing necessary.
Product highlights:
- 4-channel car amplifier
- 60 watts RMS x 4 at 4 ohms (90 watts x 4 at 2 ohms)
- 180 watts RMS x 2 bridged output at 4 ohms (4-ohm stable in bridged mode)
- Class A/B design
- variable low-pass filter (15-4000 Hz)
- variable high-pass filter (40-4000 Hz)
- bass boost (0-18 dB at 45 Hz )
- speaker-level inputs via 8-pin harness
- preamp inputs and outputs
- 8-gauge power and ground leads recommended wiring and hardware not included with amplifier
- fuse rating: 25A x 2
- 14-1/4"W x 2"H x 10-1/4"D
- warranty: 2 years
- MFR # B FOUR
What's in the box:
Helix Blue B FOUR owner's manual
- Four-channel amplifier
- Two 25 amp ATO fuses (installed)
- Four 3/4" Self-tapping screws
- 8" Speaker-level input harness (Molex plug on one end)
- 4mm Allen wrench
- 2mm Allen wrench
- Instruction manual (German/ English)
Customer reviews for Helix Blue B FOUR
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More details on the Helix Blue B FOUR
Features & specs
Performance | ||
---|---|---|
RMS Power Output (Watts x Channels) |
60 x 4 | |
Peak Power Output (Watts x Channels) | 180 x 4 | |
Power at 2 Ohms (Watts x Channels) | 90 x 4 | |
Power at 1 Ohm (Watts x Channels) | --- | |
Bridged Power (Watts x Channels) | 180 x 2 | |
Minimum Impedance Bridged | 4 | |
Minimum Impedance Unbridged | 2 | |
Minimum Impedance | 2 | |
Best Frequency Response | 10-30k Hz | |
THD at Rated RMS Power | 0.03% | |
Signal to Noise Ratio | 95 dB | |
Input Voltage | --- | |
Features | ||
Amplifier Class | AB | |
Low-Pass Crossover Frequency | 40-4000 Hz | |
Low-Pass Slope (dB/octave) | N/A | |
High-Pass Crossover Frequency | 15-4000 Hz | |
High-Pass Slope (dB/octave) | N/A | |
Bass Boost | 0-18 dB | |
Bass Boost Frequency | 45 Hz | |
Fan Cooled | No | |
Fuse Rating | 50 | |
Speaker Level Inputs | --- | |
Preamp Outputs | 1 pair | |
Width (inches) | 14-1/4 | |
Height (inches) | 2 | |
Depth (inches) | 10-1/4 | |
Parts Warranty | 2 Years | |
Labor Warranty | 2 Years |
Product Research
Features
2-Ohm Stable: In stereo mode (powering four speakers) the amplifier is stable down to 2-ohms. The 2-ohm output is 90 Watts RMS x 4 channels.
Bridgeable: The B FOUR can be bridged to two channels, outputting 180 Watts x 2-channels into 4 ohms. You can also wire the B FOUR in three channel mode, bridging half the amp and running the other half in stereo (60 Watts RMS x 2 channels plus 180 Watts x 1-channel).
Protection Circuitry: The B FOUR offers four protection circuits: short circuit (or too low an impedance on the outputs), thermal overload, over voltage, and under voltage.
Controls
4-Channel: The amplifier is divided into two sections, channels 1/2 and channels 3/4. Each pair of channels has independent gain, bass boost, and crossover controls.
Crossover: The built-in crossovers have three position switches to select the crossover operation as high-pass, full-range, or low-pass. The high-pass crossover points are continuously variable from 15 Hz to 4 kHz. The low-pass crossover points are continuously variable from 40 Hz to 4 kHz.
Gain: The rotary gain controls are continuously variable from 0.2 volts to 6.0 volts to match the source signal.
Bass Boost: The bass boost circuits are centered at 45 Hz and continuously variable from 0 dB to +18 dB.
Connections
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 four 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: Two pair of 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).
- Black: channel 1 negative
- Yellow: channel 1 positive
- Gray: channel 2 negative
- Red: channel 2 positive
- White: channel 3 negative
- Blue: channel 3 positive
- Green: channel 4 negative
- Orange: channel 4 positive
Line Output: Stereo RCA output jacks make adding another amplifier easy. The settings on the built-in crossovers have no effect on the line outputs.
Fuse: The amp is protected by two 25-amp ATO-type fuses.
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Great amp! It really is very quiet -- I get no alternator noise through this amp at all. I love the fact that this amp is German made and engineered.
JJ from New Jersey