SB Acoustics
SB Acoustics - ¾" SDC Tweeter - SB21SDC-C000-4
SB Acoustics - ¾" SDC Tweeter - SB21SDC-C000-4
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$61.95
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$61.95
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Stock status is updated regularly from my distributor. If the full quantity ordered isn’t available, I’ll get in touch.
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Description
Features
- Large surround dome for increased acoustic output
- Dual balanced compression chamber for improved dynamics
- Copper cap for reduced voice coil inductance and minimum phase shift
- Saturation controlled motor system for low distortion
- Non-reflective rear chamber with optimised damping for improved dynamics
- Flow optimised vented pole piece for optimum coupling to rear chamber
- CCAW voice coil for low moving mass
- Long life silver lead wires
- Low resonance frequency
Specifications
Specifications
General
| Driver type | Tweeter |
|---|---|
| Nominal size | 0.75" |
| Nominal impedance | 4Ω |
| Power handling (RMS) | 40 W |
| Sensitivity | 91 dB |
Thiele/Small parameters
| Resonant frequency (Fs) | 720 Hz |
|---|---|
| DC resistance (Re) | 3.1 Ω |
| Voice coil inductance (Le) | 0.04 mH |
| Mechanical Q (Qms) | 2.41 |
| Electrical Q (Qes) | 1.55 |
| Total Q (Qts) | 0.95 |
| Compliance (Cms) | 0.1954 mm/N |
| Moving mass (Mms) | 0.25 g |
| Mechanical resistance (Rms) | 0.4693 kg/s |
| Force factor (Bl) | 1.5 T·m |
| Effective piston area (Sd) | 4.9 cm² |
| Linear excursion (Xmax, one-way) | 0.5 mm |
| Displacement volume (Vd) | 0.245 cm³ |
| Efficiency bandwidth product (EBP) | 464.5 |
Motor
| Voice coil height | 1.5 mm |
|---|---|
| Air gap height | 2.5 mm |
| Magnetic flux density | 1.02 T |
| Magnet weight | 0.13 kg |
Mounting
| Overall diameter | 92 mm |
|---|---|
| Cutout diameter (suggested) | ≈ 61.0 mm |
| Mounting depth | 26.5 mm |
| Flange thickness | 3.3 mm |
| Bolt circle diameter | 80 mm |
| Mounting holes | 4 |
| Mounting hole diameter | 4.2 mm |
| Voice coil diameter | 20.4 mm |
| Weight | 0.33 kg |
Materials
| Cone | Fabric |
|---|
- Xmax is quoted one-way (peak), not peak-to-peak.
- Sensitivity measured at 2.83V/1m.
Downloads
- SB21SDC-C000-4 Datasheet
- SB21SDC-C000-4 Cutout & Recess Template (NB Audio) Straight off SB Acoustics' spec sheet: flange outline, recess depth, bolt holes. Scaled from SB Acoustics' drawing, so close but not guaranteed exact: cutout. Check it against your driver before you cut.
Where do these figures come from? See the source of each one
