Up for test is the SEAS Prestige H1397 1” Aluminum Dome Tweeter.
A commonly used tweeter in the car audio world and home audio world due to its compact size (outer diameter is only 53mm; approximately 2 inches) and relatively low cost.
Thiele-Small Parameters and Impedance
| Electrical Parameters | |||
|---|---|---|---|
| Re | 3.03 | Ohm | electrical voice coil resistance at DC |
| Krm | 0.001 | Ohm | WRIGHT inductance model |
| Erm | 0.53 | WRIGHT inductance model | |
| Kxm | 0.0002 | Ohm | WRIGHT inductance model |
| Exm | 0.83 | WRIGHT inductance model | |
| Cmes | 246 | µF | electrical capacitance representing moving mass |
| Lces | 0.07 | mH | electrical inductance representing driver compliance |
| Res | 1.05 | Ohm | resistance due to mechanical losses |
| fs | 1212.6 | Hz | driver resonance frequency |
| Loss factors | |||
| Qtp | 1.479 | total Q-factor considering all losses | |
| Qms | 1.974 | mechanical Q-factor of driver in free air considering Rms only | |
| Qes | 5.68 | electrical Q-factor of driver in free air considering Re only | |
| Qts | 1.465 | total Q-factor considering Re and Rms only | |
| Sd | 7.5 | cm² | diaphragm area |
| Magnitude of electric impedance Z(f) |
Frequency Response
2.83v/1m, Nearfield and farfield merged at 1300hz.
Harmonic Distortion
Mic placed in the nearfield and measurements performed at an SPL equal to a farfield level of 90dB/1m.
Output increased to represent 96dB/1m.
Bottom line:
- Small and very compact.
- $42 price tag (as of this writing) is attractive.
- Measured Sensitivity is ~ 85dB on-axis.
- Very nice off-axis performance, though be mindful of the on-axis rise. Likely a good candidate if a compact tweeter and 30 degrees off-axis aiming is called for.
- Well controlled high frequency dispersion.
- High THD below 2khz.
- Increasing THD above 5khz at 96dB output relative to 1m.
- Crossed at 2.5 kHz with an electrical LR4, this driver should be able to provide some decent output levels.
Overall, what I'm seeing here is a very compact, well-performing, low-cost tweeter.
End
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