Why Choose Crutchfield?
Great gear and expert advice
Our experts help you pick the ideal gear for your needs.Meet our advisors
Free tech support for the life of your gear.Read about our one-on-one expert help
You may return items that are complete and like new for any reason within 60 days.See the details of our return policy
Earn one point for every dollar you spend and use those points to save on future purchases.Get full details on Crutchfield Rewards
Deep discounts on car installation gear
We offer vehicle-specific installation instructions, dash kits, wiring harnesses, and speaker accessories at deeply discounted prices with car stereo and speaker purchases. Available for most vehicles.Learn more
Trusted since 1974
Our customers have trusted us with their business, and they’ve helped us win awards for our service.Check out our most recent awards
The manufacturer’s warranty always applies.See more details
Helix Blue B ONE
Mono subwoofer amplifier 950 watts RMS x 1 at 1 ohm
Item # 975BONE | MFR # B ONE
This item is no longer available.
Our take on the Helix Blue B ONE by Crutchfield's Buck Pomerantz
Clean lines and solid power
German engineering and craftsmanship combine to create a sleek amplifier that'll make your vehicle come alive with big bass. The Helix Blue B ONE mono amp will put out 350 watts RMS to a 4-ohm sub, 600 watts RMS to a 2-ohm sub, or a whopping 950 watts RMS to a 1-ohm subwoofer system, so you can be sure you'll always have plenty of power, whatever kind of system you have.
Made for high quality sound
The Helix Blue B ONE 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 ONE features
You'll find the tools you need to shape your bass. You can adjust the low-pass and subsonic filters to get maximum production from your enclosure and the best possible bass tone in your ride. A bass boost will add even more bang, if you want it to. And a remote level controller is included so you can dial in the right amount of bass from the front seat.
Bass amp for a Helix factory upgrade system
The B ONE can also serve as the sub 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 ONE directly into your vehicle's stereo to get its input signal, with no wire-cutting or splicing necessary.
- Or, if you're using the PP50DSP processor/amplifier and want more bass, you can get a PP-SC4 cable to directly connect it to the B ONE's input.
- mono subwoofer amplifier
- 350 watts RMS x 1 at 4 ohms (600 watts x 1 at 2 ohms)
- 950 watts RMS x 1 at 1 ohm
- Class D design
- variable low-pass filter (35-200 Hz)
- variable subsonic filter (15-50 Hz)
- bass boost (0-18 dB at 45 Hz )
- wired remote bass level control included
- speaker-level inputs via 8-pin harness
- preamp inputs and outputs
- 4-gauge power and ground leads recommended wiring and hardware not included with amplifier
- fuse rating: 30A x 3
- 14"W x 2"H x 10-1/4"D
- warranty: 2 years
- Our 60-day money-back guarantee
What's in the Box:
- Mono subwoofer amplifier
- Three 30 amp ATO fuses (installed)
- Wired remote control
- 16.5' Remote cable (RJ-25 plug on both ends)
- Four 3/4" Self-tapping screws
- Two 1/2" Screws
- 8" Speaker-level input harness (Molex plug on one end)
- 4mm Allen wrench
- 2mm Allen wrench
- Instruction manual (German/ English)
Features and Specs
|RMS Power Output (Watts x Channels)||
350 x 1 |
|Peak Power Output (Watts x Channels)||1900 x 1|
|Power at 2 Ohms (Watts x Channels)||600 x 1|
|Bridged Power (Watts x Channels)||N/A|
|Minimum Impedance Bridged||N/A|
|Minimum Impedance Unbridged||1|
|Best Frequency Response||10-250 Hz|
|THD at Rated RMS Power||0.1%|
|Signal to Noise Ratio||95 dB|
|Low-Pass Crossover Frequency||35-250 Hz|
|Low-Pass Slope (dB/octave)||N/A|
|High-Pass Crossover Frequency||N/A|
|High-Pass Slope (dB/octave)||N/A|
|Bass Boost||0-18 dB|
|Bass Boost Frequency||45 Hz|
|Speaker Level Inputs||Harness|
|Preamp Outputs||1 pair|
|Parts Warranty||2 Years|
|Labor Warranty||2 Years|
1-Ohm Stable: The B ONE is stable down to 1-ohm. The 2-ohm output is 600 Watts RMS x 1 channel and the 1-ohm output is 950 Watts RMS x 1 channel.
Protection Circuitry: The B ONE offers four protection circuits: short circuit (or too low an impedance on the outputs), thermal overload, over voltage, and under voltage.
Multiple Amplifiers: Two identical B ONE 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, subsonic filter, and bass boost), and the other the slave.
Wired Remote: The amplifier includes a wired remote control; the remote allows you to control the output level of the amplifier from the dash or center console of your vehicle. The remote features a rotary dial and comes with mounting hardware and a 16.5' connector cable, with RJ-25 phone plugs at each end.
Crossover: The built-in low pass crossover is always active. The crossover point is continuously variable from 35 to 250 Hz.
SubSonic Filter: The subsonic filter is designed to prevent frequencies below the audible range (or below the range the subwoofer can reproduce) from being delivered to the subwoofer. The subsonic crossover point is continuously variable from 15 to 50 Hz.
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.
Master/Slave: Choose the master or slave mode if using two B ONE 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 4-gauge (HELIX recommends 4-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: 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 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 and subsonic filter have no effect on the line outputs.
Master Output: A single RCA jack supplies the audio signal to another B ONE amplifier when two are strapped together to power one subwoofer.
Slave Input: A single RCA jack serves as the input when two B ONE amplifiers are strapped together to power one subwoofer.
Fuse: The amp is protected by three 30-amp ATO-type fuses.
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.
1 question already asked
I forwarded your question to an Advisor and they responded with the following: The Helix Blue B ONE amp will work for two of those subwoofers when wired in series creating a 4-ohm load. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy Dec 05, 2014 ] Staff