Reference Monitors
- Blow 5
- Blow5D
- Blow 5# [sharp]
- Blow 4
- Blow4D
- Blow4# [sharp]
FireWire Audio Interfaces
- DeuX
- Windy6
USB Audio Interfaces
- UAX2
- Amon
PCI Audio Interfaces
- Quartet
- M49 USB Midi Controller
- UFO# [sharp]

Welcome to INFRASONIC website.
BLOW4D Studio Monitor
Products > Reference Monitors > Blow 4

Uncolored Frequency Reproduction. Analog Input.
Adjustments for Room Acoustics. 55-Watts of Mind Blowing Audio.

Available from
Infrasonic Dealers

BLOW4 is a 55-Watt, powered near-field studio monitor speaker. BLOW4 features a two-way, bi-amplifier design to achieve high quality sound. Frequency response is broadened downward by a bass reflex system, and broadened upward by a natural silk dome tweeter for delicate signal reproduction. Enclosure design contributes to the broad frequency response.

From the commercial studio to the home studio, BLOW4 is one of the premier solutions for near field studio monitoring. Use the controls on the back panel of the BLOW4 to your control room acoustics. With output this accurate, you'll hear what you've been missing.


Units per Package

  • One pair (two speakrs)


  • 2-way bass-reflex bi-amplified 4 inch near field studio monitor
  • Flat frequency response (짹1.5 dB, 73 Hz to 20 kHz) and wide pass-band
    frequency (62Hz ~ 22kHz)
  • 55 watt (25 watt HF and 30 watt LF) power amplifiers with servo-loop and
    perfect protections.
  • 0.75" natural silk dome High frequency transducer
  • 4" Polymer coated paper fiber cone low frequency transducer
  • Full magnetic shielded enclosure and independent amplifier room
  • XLR and 1/4"TRS phone jack balanced/unbalanced inputs
  • EASC (Enhanced Acoustic System Compensation) Technology
  • Input sensitivity control
  • High frequency 3-step tilt controls switch
  • Acoustic space control switch
  • Bass cut-off frequency control switch
  • 4th order active crossover network
  • Front Illuminant Logo lamp and protection indicator
  • High-strength cabinet constructed MDF composite with radius edges
    DA-912 (included in BLOW4D)
  • XLR for AES/EBU (IEC60958) and RCA for S/PDIF coaxial digital inputs
  • RCA thru out port for stereo connection
  • IEC60958 EIAJ CP1201 compatible 24-bit digital input with up to 192kHz
  • High-end 24-bit/192kHz D/A converter with 123dB dynamic range
  • XLR/RCA source and Left/Right channel selection switch

DA-912 Digital Interface Module


Blow 4 Studio Monitors
Blow4 Reference Monitor. Click to enlarge.



System / Enclosure

  • Two-way, bi-amplified reference monitor (bass-reflex type)
  • Free field frequency Response: 73Hz ~ 20kHz (+/- 1.5 dB)
  • Free field cutoff response 62Hz ~ 22kHz (+/- 3.0dB)
  • Measured Maximum Continuous: 101dB SPL / 1m
  • Harmonic distortion at 90 dB SPL @ 1 m on axis: 0.5% under
  • Low frequency driver:
    - Diaphragm Type: Polymer coated paper fiber cone type
    - Diameter: 4" (101 mm)
    - Voice Coil: 1.0" (25 mm)
    - Magnet Type: Ferrite magnet with magnetically shielded
    - Impedance: 6 ohms
  • High Frequency Driver
    - Diaphragm Type: Natural Silk Dome with Waveguide.
    - Diameter: 0.75" (19mm) diaphragm
    - Magnet Type: Ferrite magnet with magnetically shielded
    - Impedance: 8 ohms
  • Low Frequency Vent Type : Front ported, Slotted aperture
  • Internal cabinet volume: 3.7 liters
  • Enclosure Construction: 13mm Vinyl-laminated M.D.F

DA-912 Digital Interface Module

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