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  5. REF FOUR
B2 Audio REF FOUR 4-Channel Amplifier
SKU:  B2-REF-FOUR
300 Watt

REF FOUR

SKU:  B2-REF-FOUR

Technical Highlights

  • The output power is 4 x 200 W RMS at 4 ohms, 2 x 1200 W RMS.
  • At an impedance of 2 ohms, the amplifier delivers 4 x 300 W RMS.
  • Frequency response from 15 Hz to 25 kHz, SNR over 90 dB, Class A/B.
  • More technical details
€749,00
€749,00 €749,00
5% discount with credit card
inkl. VAT , possibly plus shipping
Delivery
Jun 6, - Jun 9,
x piece
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€749,00 €749,00

REF FOUR by B2 Audio

The REF FOUR is a 4-channel amplifier from B2 Audio that delivers impressive sound quality thanks to its Class A/B circuitry. It covers a frequency response of 15 Hz to 25 kHz and achieves a signal-to-noise ratio of over 90 dB for a clear listening experience. Integrated high-pass and low-pass crossovers allow for precise adjustment of the audio settings. The amplifier delivers 4 x 200 W RMS into 4 ohms and 4 x 300 W RMS into 2 ohms; in bridged mode, it can deliver 2 x 1200 W RMS. The REF FOUR also boasts a compact design and a safe 150 A fuse rating.

Features

  • Model: REF FOUR
  • Circuit configuration: Class A/B
  • Frequency response: 15 Hz – 25 kHz
  • Signal-to-noise ratio: >90 dB
  • Input sensitivity: 6 V – 0.3 V
  • Crossover frequency: 24 dB/octave
  • Low-pass crossover: 40 Hz – 400 Hz
  • High-pass crossover: 40 Hz – 4 kHz
  • Bass EQ: 45 Hz / 0–12 dB
  • Connection cross-section: 0 gauge / 67 mm
  • Fuse rating: 150 A
  • Dimensions (all in inches): 16.42" (length) x 6.30" (width) x 2.52" (height)
  • Continuous output power (RMS) at 14.4 V, 1% THD:
  • 4 ohms: 4 x 200 W RMS
  • 2 ohms: 4 x 300 W RMS
  • 4 ohm bridged: 2 x 1200 W RMS

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Frequently Asked Questions about REF FOUR

What circuit configuration does the B2-REF-FOUR Amplifier use?

The B2-REF-FOUR Amplifier utilizes a Class A/B circuit configuration. This circuit combines the advantages of Class A and B to deliver excellent audio quality with high efficiency. This technique minimizes distortion while maximizing operational efficiency, resulting in clear and dynamic sound reproduction. Particularly in the mid to high power range, this configuration can showcase its strengths by providing enough power to drive demanding speaker systems. The Class A/B is therefore particularly interesting for audiophiles who place the highest value on sound quality.

What are the performance specifications of the B2-REF-FOUR in different ohm configurations?

The B2-REF-FOUR from B2 Audio offers a continuous output power of 4 x 200 W RMS at 4 ohms, ensuring balanced and powerful audio playback. At 2 ohms, the power significantly increases to 4 x 300 W RMS, providing higher volumes and a powerful sound. When the amplifier is operated in bridged mode at 4 ohms, it delivers an impressive 2 x 1200 W RMS. These power configurations make the B2-REF-FOUR extremely flexible for use in various car audio setups, depending on specific system requirements and desired volume.

What is the frequency response of the B2-REF-FOUR and how do the crossovers affect it?

The B2-REF-FOUR Amplifier covers a frequency response of 15 Hz to 25 kHz, encompassing nearly the entire audible spectrum. The integrated crossovers allow for precise sound adjustment. The high-pass crossover is adjustable from 40 Hz to 4 kHz, and the low-pass crossover covers 40 Hz to 400 Hz. Both have a slope of 24 dB/octave, allowing for precise frequency separation for speakers. This means that the amplifier can be optimally tuned to specific audio needs, whether for deeper bass or clear highs.

What is the input sensitivity of the B2-REF-FOUR Amplifier?

The input sensitivity of the B2-REF-FOUR ranges from 6 V to 0.3 V. This range allows the Amplifier to be connected to a variety of source devices, whether it's a weaker audio signal from a mobile device or a stronger signal from a high-end car radio. By correctly setting the input sensitivity, it can be ensured that the Amplifier processes the signal without distortion while achieving optimal audio performance, which is particularly important for demanding audio applications.

What signal-to-noise ratio does the B2-REF-FOUR offer?

The B2-REF-FOUR from B2 Audio offers a signal-to-noise ratio of over 90 dB. A high SNR value is crucial for the clarity of audio output, as it indicates the ratio between the useful audio signal and the unwanted noise generated by the Amplifier. A value over 90 dB means that the noise is very low compared to the actual audio signal, resulting in very clear and uncolored sound reproduction. This is especially important for users who value high sound fidelity in their audio setup.

What are the dimensions of the B2-REF-FOUR and what do they mean for installation?

The B2-REF-FOUR measures 16.42 inches in length, 6.30 inches in width, and 2.52 inches in height. These compact dimensions allow for versatile installation, as the Amplifier can be easily installed under a seat, in the trunk, or in a custom-made enclosure in many vehicles. Despite its compact size, it still offers powerful performance. When choosing the installation location, it should be considered that there is enough space around the Amplifier for heat dissipation to ensure optimal performance, especially during intensive use.

How does the fuse rating of the B2-REF-FOUR affect safety?

The B2-REF-FOUR has a fuse rating of 150 A, which must be taken into account when selecting wiring and fuses in the vehicle. Such a fuse rating reflects the performance capability of the Amplifier and simultaneously allows for adequate protection against electrical overload or short circuits. When installing, it is important to consider the fuse rating and use appropriate fuses to ensure the safety of the entire audio system. This prevents potential damage to the Amplifier and connected components due to power surges.

What bass EQ settings does the B2-REF-FOUR offer?

The bass EQ of the B2-REF-FOUR provides a boost function at 45 Hz in the range of 0 to 12 dB. This control allows for precise adjustment of the bass reproduction of the entire audio system. Especially for music genres that benefit from strong bass lines, such as hip-hop or electronic music, using the bass EQ can elevate the sound to a new level. The user can precisely set how much low-end range should be amplified without compromising the overall sound characteristics. This makes the B2-REF-FOUR extremely adaptable for various sound profiles.

Is the B2-REF-FOUR compatible with common car brands or models?

The compatibility of the B2-REF-FOUR Amplifier with various car brands or models depends on the specific dimensions of the installation location, which requires a minimum size within the vehicle of 16.42" x 6.30" x 2.52". Due to its compact design, it is suitable for many vehicles; however, the installation location should be chosen carefully. Manufacturer-specific support is not provided, which may require precise control and possibly adjustments to the installation location to ensure air circulation for cooling and to enable performance optimization.

What cable and connection specifications are relevant for the B2-REF-FOUR?

The connection cross-section for the B2-REF-FOUR is 0 Gauge or 67 mm², indicating the need for high-quality, thick cables capable of safely handling the high current load. This cable specification ensures that the amplifier receives the necessary power supply to deliver its maximum performance. When wiring the system, it is essential to select the correct types and grades of cables to minimize energy losses and not impair the overall functionality of the amplifier. Proper wiring ensures flawless and efficient operation.

Manufacturer information / responsible person

B2 audio ApS
Jay Holm
Plantevej 35, 1 th.
2870 Dyssegaard
Denmark

Contact: info@b2audio.com

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