SB Acoustics SB21RDCN-C000-4 / Fabric Ring Radiator Dome Tweeter
SB Acoustics SB21RDCN-C000-4 / Fabric Ring Radiator Dome Tweeter - Image 2
SB Acoustics SB21RDCN-C000-4 / Fabric Ring Radiator Dome Tweeter - Image 3
SB Acoustics SB21RDCN-C000-4 / Fabric Ring Radiator Dome Tweeter - Image 4
SB Acoustics SB21RDCN-C000-4 / Fabric Ring Radiator Dome Tweeter - Image 5

SB Acoustics SB21RDCN-C000-4 / Fabric Ring Radiator Dome Tweeter

222,00 лв.

The SB21RDCN-C000-4 is a fantastic ring dome tweeter when you need smooth sound, great dispersion, and a compact form factor. It’s ideal for high-resolution 2-way or MTM speakers where space is tight, and you still want refined treble with a wide soundstage.

SKU: 060-2969
Category: , ,

Rating: 4 out of 5.
Brand:

Description

The SB Acoustics SB21RDCN-C000-4 is a 21 mm fabric ring dome tweeter with a neodymium magnet and a compact faceplate, designed to deliver exceptional off-axis response, smooth treble, and high sensitivity in a small, high-performance package.

It’s the neodymium version of the SB21RDC-C000-4, offering similar sonic performance but in a smaller footprint — ideal for narrow baffles, MTM speakers, or space-constrained designs.

Features

  • Non-resonant diaphragm design for minimum high frequency break-up
  • Copper cap for reduced voice coil inductance and minimum phase shift
  • Compact low distortion neodymium motor system
  • Non-resonant rear chamber with optimized damping for improved dynamics
  • CCAW voice coil for low moving mass
  • Long life silver lead wires
  • Low resonance frequency

Specs

  • Nominal Impedance 4 Ω
  • DC resistance, Re 3.1 Ω
  • Voice coil inductance, Le 0.04 mH
  • Effective piston area, Sd 4.6 cm2
  • Voice coil diameter 20.4 mm
  • Voice coil height 1.5 mm
  • Air gap height 2.0 mm
  • Linear coil travel (p-p) 0.5 mm
  • Moving mass incl. air, Mms 0.25 g
  • Free air resonance, Fs 850 Hz
  • Sensitivity (2.83V/1m) 89.5 dB
  • Mechanical Q-factor, Qms 2.71
  • Electrical Q-factor, Qes 2.45
  • Total Q-factor, Qts 1.28
  • Force factor, Bl 1.3 Tm
  • Rated power handling* 40 W
  • Magnetic flux density 0.9 T
  • Magnet weight 0.01 kg
  • Net weight 0.06 kg

* IEC 268-5, high-pass Butterworth, 2600 Hz, 12 dB/oct.

✅ Highlights

  • Wide and even dispersion – excellent for wide sweet spots and off-axis listening

  • Compact faceplate (72 mm) – great for tight driver spacing or modern narrow cabinets

  • Smooth and detailed treble – avoids harshness, well-suited for long listening sessions

  • Low Fs (~1.1 kHz) – crossover flexibility, even as low as ~1.8 kHz with proper slope

  • Neodymium motor – compact without sacrificing magnetic strength

🛠️ Crossover Tips

  • Recommended crossover point: 1.8–2.5 kHz
    (Use 4th-order slopes if crossing close to 1.8 kHz)

  • Great pairings:

    • SB13PFC25-4 – 5″ paper cone woofer

    • SB15NRXC30-4 – 5.5″ woofer

    • SB17NRX2C35-4 – 6.5″ woofer

  • Ideal for MTM, bookshelf, or compact 2-way speaker designs

⚖️ Comparison: SB21RDCN vs SB21RDC

Feature SB21RDCN-C000-4 SB21RDC-C000-4
Magnet Type Neodymium Ferrite
Faceplate Size 72 mm (compact) 104 mm
Fs ~1.1 kHz ~1.0–1.2 kHz
Sensitivity ~90–91 dB ~90 dB
Best Use Case Compact / MTM speakers Standard baffle designs

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