SKU: 24600938788

Fostex NF04R Compact 2-Way 50W Active Studio Monitor (Single) - 4"

Sale price$391.05 Regular price$434.50
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Description

Fostex NF04R Compact 2-Way 50W Active Studio Monitor (Single) - 4"The Fostex NF04R is a compact, active monitor designed to provide a detailed and balanced sonic image for critical listening and mixing in near field environmentsat home or in the studio. The monitor features a 4" HR shaped woofer and a 0. 75" UFLC soft dome tweeter, each driven by dedicated Class D amplifiers (30W and 20W respectively). The NF04R's design emphasizes accurate sound reproduction with surprisingly deep and tight bass for its size,

The Fostex NF04R is a compact, active monitor designed to provide a detailed and balanced sonic image for critical listening and mixing in near-field environments—at home or in the studio. The monitor features a 4" HR-shaped woofer and a 0.75" UFLC soft-dome tweeter, each driven by dedicated Class-D amplifiers (30W and 20W respectively). The NF04R's design emphasizes accurate sound reproduction with surprisingly deep and tight bass for its size, thanks to technologies like UDR Tangential Edge and Push-Pull Damper, which eliminate speaker resonance.

Key features include adjustable woofer and tweeter levels, a gain switch for input-level matching, and both balanced XLR and unbalanced 1/4" TS inputs. The NF04R's compact dimensions and relatively light weight make it suitable for use on desktops and in smaller spaces.

Features
  • 4" HR (Hyperbolic Paraboloidal Rotation)-shaped woofer, delivering tight, high-speed, and surprisingly deep bass for its size
  • UDR Tangential Edge and Push-Pull Damper technologies in the woofer eliminate unwanted resonance, ensuring excellent linearity and a responsive mid-low range.
  • UFLC soft dome tweeter uses an ultrafine layered-construction (UFLC) diaphragm, providing high responsiveness and faithful reproduction of delicate high-frequency audio signals. Magnetic fluid in the magnetic circuit ensures stable long-term operation.
  • Bi-amplification with high-performance D-Class amplifiers: It has a dedicated 30W amplifier for the woofer and a 20W amplifier for the tweeter, providing efficient and powerful drive.
  • Adjustable sound-pressure levels: You can adjust the bass level (-2, -4, -6 dB at 80 Hz) and the tweeter level (-2 dB) to suit your listening environment.
  • Adjustable gain: A gain switch (0/+10 dB) allows for matching the input level from various audio devices.
  • HR Diaphragm: This woofer diaphragm shape, derived from architectural structural mechanics, is lightweight, highly rigid, and effectively disperses resonance.
  • High-Precision resin-molded enclosure ensures a perfect fit and stability, with internal cushioning to prevent rattling.
  • Connectivity: Offers both balanced (XLR) and unbalanced (1/4" TS) inputs.

Specifications

Number of Included Monitors
Single Monitor
Enclosure
Bass-Reflex/Ported
Total Power Output
50 W
Drivers
Tweeter
1x 0.75" / 19.05 mm Dome
Woofer
1x 4" / 10.2 cm Cone
Amplifiers
HF: 20 W Class-D
LF: 30 W Class-D
Performance
Frequency Response
57 Hz to 36 kHz
Maximum Input Level
+4 dBu (Balanced)
Signal Processing
EQ
No
Filters
No
Crossover Frequency
80 Hz
Phase Adjustment
No
Connectivity
Audio I/O
1x XLR 3-Pin Balanced Input
1x 1/4" TS Unbalanced Input
Digital Audio I/O
No
Network I/O
No
USB
No
Wireless
No
Mobile App Compatible
No
Power
AC Input Power
100 VAC, 50/60 Hz
Power Consumption
30 W
Physical
Color
Black
Monitor Orientation
Vertical or Horizontal
Dimensions (W x H x D)
4.7 x 7.4 x 6.2" / 120 x 189 x 157 mm
Weight
6.8 lb / 3.1 kg
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 24600938788

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Stephen Girardi
Carnegie, US
★★★★★ 5
Well worth it
Size: 8" x 10" x 2"
For my 2023 Honda pilot this was an awesome replacement and it smells actually very good. Well worth the money. Fit perfectly
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 29, 2024
J
Verified Purchase
Julie A. Curristan
Chelsea, US
★★★★★ 5
All I need is the air that I breathe and to love you
Size: 8" x 10" x 2"
What a feeling! With the engine air filter changed, the engine was able to take deeper, longer breaths, eventually reaching that famous “runners high” you hear so much about. The new interior air filter changed the atmosphere into crisp, clean mountain fresh air, causing my passengers and me to spontaneously yodel with abandon. Here’s to believing!
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Reviewed in the United States on January 2, 2026
J
Verified Purchase
JM
West Palm Beach, US
★★★★★ 4
Wasn’t green but confirmed with Ecogard that it’s the correct filter
Size: 8" x 10" x 2", Size: 8" x 10" x 2"
As the title says the filter wasn’t green this time (purchased 3 other times). I read off the numbers to Ecogard technical support and they said it was their filter and by the date code manufactured by a different factory. This one was grey/black with blue edge and you could tell there was charcoal embedded in it. Not sure if it will perform the same and smell the same, as I preferred the scent of the green one. The listing needs to be updated with the correct picture if the green isn’t made anymore.
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Reviewed in the United States on March 11, 2026
D
Verified Purchase
Davian
Lake Worth, US
★★★★★ 5
Very clean air quality.
Size: 8" x 10" x 2"
Immaculate air quality. Easy to install.
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Reviewed in the United States on July 24, 2025
K
Verified Purchase
Kimmy
Massapequa, US
★★★★★ 5
Effective
Size: 8" x 10" x 2"
Works great
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Reviewed in the United States on September 19, 2025

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