CSS EL70 EN
With a special thanks to Dr. Nikola Krivorov for submitting his pair of CSS EL70 EN
EL70 is paper cone full range driver produced by Creative Sound Solutions. It features 70mm cone from the creative mind of Mark Fenlon, principal designer at Mark Audio. This pair was upgraded by Planet_10 hi-fi by EnABL 2 process.
This is the manufacturer's brochure
My Measurements
| Driver Properties | Thiele - Small Parameters | ||||
|---|---|---|---|---|---|
| Chassis material | Polymer | Parameter | Measured | Datasheet | |
| Membrane material | Paper | Fs | 69Hz | 64 Hz | |
| Magnet System | Ferrite | Re | 3.6 Ω | 3.6 Ω | |
| Surround | Tri-mix Ei grade butyl rubber | Qms | 4.3 | 3.23 | |
| Voice Coil Diameter | 20 mm | Qes | 0.59 | 0.66 | |
| Nominal Impedance | 4 Ω | Qts | 0.52 | 0.55 | |
| Sensitivity | 86 dB/W/m | Vas | 4.9 ltr | 6.1 ltr | |
| Rated Power | 20W | Le | 0.25 mH | 0.251 mH | |
Frequency response 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 measured at 2.83V input RMS. Remarkable low distortion in the most audible frequency range between 1 and 5 kHz.
Burst decay response, measured at 1m on axis
The impedance curve in 18 ltr sealed box
Conclusion
This driver is widely used in DIY constructions. They are several successful enclosures for CSS EL70 EN - Onken, MLTL, single or bi-pole BVR.
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