SEAS MR18REX/XF H1699-08/06
This is the driver I have waiting for so long. It fits perfect to my concept for a the best three-way loudspeaker constriction. SEAS developed first an Excel model C18EN001/M which features metal membranes for both drivers I don't like so much. Unlike it, the MR18REX/XF has flat relief paper cone and silk dome tweeter. It uses the standard SEAS 18cm vented chassis. The spider is enforced at the top with a plastic ring, that holds the gold plated terminals as well.
This is the manufacturer's datasheet
My Measurements
| Driver Properties | Thiele - Small Parameters | ||||
|---|---|---|---|---|---|
| LF Section | HF Section | Parameter | Measured | Datasheet | |
| Membrane material | Pre-coated reed paper | Silk dome | Fs | 132 Hz | 126 Hz |
| Magnet System | Ferrite | Neodymium | Re | 6.2 Ω | 6.2 Ω |
| Surround | Rubber | Silk | Qms | 2.64 | 2.49 |
| Voice Coil Diameter | 38 mm | 25mm | Qes | 1.05 | 0.96 |
| Nominal Impedance | 8 Ω | 6 Ω | Qts | 0.75 | 0.69 |
| Sensitivity | 89 dB/W/m | 91 dB/W/m | Vas | 2.4 ltr | 3 ltr |
| Rated Power | 80W | 90W | Le | 0.27 mH | 0.43 mH |
Frequency response of midrange and tweeter section at 1m with 2.83 V input RED - on axis, BLUE - 15 º off axis, GREEN - 30 º off axis
The second, third and fourth harmonic curves of midrange and tweeter section measured at 2.83V input RMS.
Burst decay response of midrange and tweeter section, measured at 1m on axis
The impedance curves of midrange and tweeter section
Conclusion
My first listening impressions using a quickly developed crossover without low-frequency support showed that this is a promising component for a demanding audiophile loudspeaker system. The sound is vivid with an impressive 3D imagination. More information will come when I complete my 3-way project with two eight-inch woofer support...
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