SB Acoustics SB26STCN-C000-4




The SB Acoustics SB26STCN-C000-4 is a 4Ω coated textile dome tweeter using a Neodymium magnet and a 1” voice coil together with copper cap pole piece. The compact 72mm faceplate is made of plastic.

Key features:

  • CCAW voice coil for low moving mass
  • Long life silver lead wires
  • Low resonance frequency
  • 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


SB Acoustics Spec sheet: SB26STCN-C000-4


T/S Parameters:


SB26STCN-C000-4 T-S











Good consistency between the two tweeter samples. Slightly lower Fs than the manufacturer’s specification.




SB26STCN-C000-4_Imp 1L vs 2R WT3

(click on picture to zoom)
Sample 1 = Green
Sample 2 = Blue

Besides the sample 1 slightly higher impedance at Fs, almost identical impedance curves between the tweeter samples.



Frequency measurement conditions:

The tweeter is measured mounted on a baffle with the following conditions:

Baffle size (WxH): 24×35cm with 18mm round-over.
Driver position: Mounted on center-line with driver unit center 9.4cm from the top of the baffle.
Mic position: 1m distance, on tweeter-axis.
Smoothing: 1/24 octave smoothing applied.

SB26STCN-C000-4_Freq 1L vs 2R 0degSB26STCN-C000-4_Freq 1L vs 2R 15deg

(click on picture to zoom)

Left: Frequency response on-axis (Blue=sample1, Red=sample2).
Right: Frequency response 15deg off-axis (Blue=sample1, Red=sample2).

Almost identical frequency response up to about 17kHz. Sample 1 has a slightly higher sensitivity than sample 2.

SB26STCN-C000-4_Freq 0-15-22deg

0deg = Blue
15deg = Red
22.5deg = Green

SB26STCN-C000-4_Freq 30-45-60deg

30deg = Blue
45deg = Red
60deg = Green

The tweeter has a very nice off-axis frequency response.



Measurement setup:

  • Tweeter near-field measurement at 10cm
  • Frequency Range Tweeter: 500-10000Hz
  • Baffle size WxH: 24×35cm

The distortion measurements are done in near-field and the amplifier output level was adjusted for each driver so that the fundamental is 90dB and 95dB at 1m. This setting simulates  medium-high and high listening levels.

SB26STCN-C000-4-1L -- 10cm 90dbSB26STCN-C000-4-2R -- 10cm 90db

(click on picture to zoom)

90dB @ 1m
Left = Sample 1
Right = Sample 2

SB26STCN-C000-4-1L -- 10cm 95dbSB26STCN-C000-4-2R -- 10cm 95db

(click on picture to zoom)

95dB @ 1m
Left = Sample 1
Right = Sample 2

Average odd-order distortion performance even at higher levels and somewhat elevated second-order distortion, which gradually raises below 2.5kHz. This tweeter delivers a high performance in relation to its low price.

This tweeter should be able to work nicely crossed-over at 2.5-3kHz or higher.