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Helix Blue B TWO

2-channel car amplifier — 80 watts RMS x 2

3 Reviews | 2 questions - 2 answers

Item # 975BTWO

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Overview

Our take on the Helix Blue B TWO

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 TWO 2-channel amplifier puts out 80 watts RMS each to your full-range speakers, or you can switch to bridged mode to power a subwoofer with up to 200 watts RMS.

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 TWO 2-channel amplifier puts out 80 watts RMS each to your full-range speakers, or you can switch to bridged mode to power a subwoofer with up to 200 watts RMS.

Made for high quality sound

The Helix Blue B TWO 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 TWO 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 TWO 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 TWO directly into your vehicle's stereo to get its input signal, with no wire-cutting or splicing necessary.

great amp

Don Boivin Jr, Massachusetts

What's in the Box:

  • Two-channel amplifier
  • One 30 amp ATO fuse (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)

Product Highlights:

  • 2-channel car amplifier
  • 80 watts RMS x 2 at 4 ohms (120 watts x 2 at 2 ohms)
  • 200 watts RMS x 1 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: 30A x 1
  • 11-3/16"W x 2"H x 10-1/4"D
  • warranty: 2 years
  • Our 60-day money-back guarantee
Reviews

Helix Blue B TWO Reviews

Average Customer Review(s):

(3 Reviews)
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Details

Hands-on research

Product Research

Features
Controls
Connections

Features

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.

Controls

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.

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 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 line outputs.

Fuse: The amp is protected by a single 30-amp ATO-type fuse.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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Q & A

Customer Q&A

2 questions already asked

I forwarded your question to an Advisor and they responded with the following: Yes you would still be able to use the fade function on your receiver when using a separate amplifier and the preamp outputs on the receiver. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  Jan 29, 2015 ]  Staff
Yes, I bought this amp to run a set of Infinity Kappa speakers. Excellent amp!! Would definitely purchase again! [ CHRISTOPHER K  Jan 15, 2015 ]
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