Test: ScanSpeak Ellipticor 21WE/4542T00
Copyright 2018 © Troels Gravesen


From ScanSpeak data sheet.

Above a preliminary 2-way set-up from the new 21WE/4542T00 midwoofer and D3404/552000 tweeter. A 30 x 57 cm baffle on my 34 litre test cabinets to make crossover simulations and a quick crossover mockup. Does this work at all? How is the midrange? Does it play bass? Can we get away with a simple LR2 crossover?
I'm always anxious to know when getting new drivers. After a few hours of tweaking it is clear that this combination of drivers, run from a simple 2nd order filter with the tweeter placed below the mid-bass to compensate for the time difference, is a viable solution for a future 2-way construction. Punchy bass, remarkable dynamic and transparent midrange - and the treble as expected from the Ellipticor-1 and Ellipticor-4 constructions. The midrange most of all reminds me of my 18 Sound midrange in The Loudspeaker, partly due to size, but that level of transparency and speed... Something special.
Measurements suggest a healthy 90-91 dB sensitivity. My 32 wpc EAR 861 32 and 60 wpc GlowMaster tube amps have no trouble running these speakers to thunderous levels. I play these Ellipticor drivers louder than normal - because they simply can be played louder than normal.

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Download specs here.


21WE/4542T00 measured on a 60 x 100 cm baffle at 0.25 cm distance, normalised for 2.8V/1 meter. Measurement merged with near-field response @ 200 Hz. The panel is mounted on a 34 litre vented cabinet tuned at 38 Hz, hence the dip at this frequency.
Fairly high efficiency from an 8" driver. For the 8 Ohm version, we can expect 91 dB/2.8V sensitivity. Data here.


Same as above only on a 30 x 57 cm baffle, driver mounted 15 cm from top to center of driver.
Reading merged with near-field response @ 200 Hz.
Generally this should not pose any major problem in implementation. Smooth, slightly rising frequency response is easy on crossovers.
Small notch at 3.3 kHz. May need attention - or maybe not. Time will tell.

CSD from reading on 60 x 100 cm baffle.

Impedance from driver mounted on 34 liter damped and vented cabinet, port tuning ~38 Hz.


Free air impedance. Fs around 41 Hz and Qt = 0.35, ideal for a vented construction.
The CLIO measures at fairly low voltage, hence higher Qt and Fs compared to SS data measured at a higher voltage.


Distortion measured at an input level equal to 94 dB/1 meter.
Green = 2nd harm., blue = 3rd harm.
Reading is valid down to around 250 Hz.


Distortion measured at an input level equal to 100 dB/1 meter.
No wonder I can play this speaker loud!