Overview:
The SB Acoustics SATORI TW29R-B is a 4Ω coated textile ringe dome tweeter using a 29mm voice coil together with a dual copper cap pole piece.
Key features:
- Non-resonant diaphragm design for minimum high frequency break-up
- Two part aluminium black faceplate with integrated mechanical decoupling
- Dual balanced compression chambers for improved dynamics
- Dual copper caps for absolute minimum voice coil inductance and minimum phase shift
- Saturation controlled motor system with T-shaped pole piece for lower distortion
- Non-reflective cast alumimium chamber with optimized damping for improved dynamics
- Flow optimized vented pole piece for optimum coupling to rear chamber
- CCAW voice coil for low moving mass
- Long life silver lead wires
- Low resonance frequency for extended range
SB Acoustics Spec sheet: Satori TW29R-B
T/S Parameters:
(click on picture to zoom)
The resonance frequency is almost identical as the official specification.
Impedance:
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Sample 1 = Green
Sample 2 = Blue
Minor differences between the two driver samples.
Frequency:
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 8cm from the top of the baffle.
Mic position: 1m distance, on tweeter-axis.
Smoothing: 1/24 octave smoothing applied.
(click on picture to zoom)
Left: Frequency response on-axis (Blue=sample1, Red=sample2).
Right: Frequency response 15deg off-axis (Blue=sample1, Red=sample2).
The two driver samples have almost identical frequency responses up to about 13kHz. The on-axis measurement shows a rising frequency response above 9kHz, while the 15deg off-axis measurement shows almost a flat frequency response between 2-20kHz.
0deg = Blue
15deg = Red
22.5deg = Green
30deg = Blue
45deg = Red
60deg = Green
Distortion:
Measurement setup: Updated 2016-12-03
- 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.
(click on picture to zoom)
90dB @ 1m
Left = Sample 1
Right = Sample 2
(click on picture to zoom)
95dB @ 1m
Left = Sample 1
Right = Sample 2
Very low odd-order distortion profile down to 1kHz, but at the same time a rapidly rising distortion profile below 3kHz of the relatively harmless second-order distortion.