SB Acoustics SB26STCN-C000-4 / Fabric Dome Tweeter

The SB Acoustics SB26STCN-C000-4 is one of the most popular and highly regarded soft dome tweeters in the SB Acoustics lineup. It strikes an outstanding balance between performance, size, and value, making it a favorite for both DIY speaker builds and commercial loudspeaker designs.

Features

• Copper cap on pole piece for reduced voice coil inductance and minimum phase shift
• Fine weave soft fabric dome for smooth frequency response
• Inherently shielded neodymium motor system
• Internal pressure equalization and flow resistor for non-resonant coupling of cavities
• Compact design
• CCAW voice coil for low moving mass
• Long life silver lead wires
• Low resonance frequency

Specs

• Nominal Impedance 4 Ω
• DC resistance, Re 3.2 Ω
• Voice coil inductance, Le 0.04 mH
• Effective piston area, Sd 6.2 cm2
• Voice coil diameter 25.4 mm
• Voice coil height 1.3 mm
• Air gap height 2.5 mm
• Linear coil travel (p-p) 1.2 mm
• Moving mass incl. air, Mms 0.3 g
• Free air resonance, Fs 960 Hz
• Sensitivity (2.83 V / 1 m) 92.5 dB
• Mechanical Q-factor, Qms 1.6
• Electrical Q-factor, Qes 1.77
• Total Q-factor, Qts 0.84
• Force factor, Bl 1.8 Tm
• Rated power handling* 120 W
• Magnetic flux density 1.2 T
• Magnet weight (neo) 21 g
• Net weight 0.1 kg

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

✅ Why It’s a Standout

• Compact form factor – the neodymium motor allows a smaller faceplate, ideal for narrow baffles or MTM/MTMW designs.

• Natural and balanced sound – soft dome smoothness without dullness or sizzle.

• Excellent dispersion – maintains clarity off-axis.

• High sensitivity – ~91 dB is great for pairing with less efficient woofers.

• Budget-friendly – punches far above its price point in clarity and refinement.

🔧 Best Use Cases

• 2-way and 2.5-way bookshelf or tower speakers

• MTM speakers or narrow front-baffle designs

• Compact speaker systems requiring a tight layout

• Projects demanding high-value, natural-sounding treble

🛠️ Crossover Guidance

• Recommended crossover point: ≥2.0–2.5 kHz
  (With 12 or 18 dB/octave slopes)

• Works well with:

  • SB13PFC25-4 / SB15NRX2C30-4 (4–6.5″ woofers)

  • Many Dayton Audio, Scan-Speak Discovery, and Peerless midwoofers

• If you use a higher-order filter (like 4th order), you can cross slightly lower.

⚖️ Comparison: SB26STCN vs SB26ST-C000-5