Well, in a similar move to the F18/W18 Lii Song brand have released his new woofer W-21, a similar unit to the Lii Audio W-21 woofer I posted before here:
https://www.audiocircle.com/index.php?topic=184401.0Fortunately this new Lii Song W-21 woofer seems offer some enhancements over his brother Lii Audio, as these:
= Have a higher Qts=0.816,
= Wood phase plug
= Higher price $699 each
= However it have two 8Ω Voice Coils.
= Sensitivity is low only 92dB with one VC.
https://www.lii-audio.com/product/w21/Technical Data:
Related power – Maximum power: 200W – 250W
Nominal Inpendance Z: 8+8 Ohm
Fs: 23.78Hz
Qms: 6.438
Vas: 913.57 L
Cms: 0.528 mm/N
Mms: 643.9 g
Sd: 2614.82 sqcm
Qes: 0.934
Qts: 0.816
Re: 7.60 ohm
Sensitiviry (2.83V / 1m): 92 .1dB （single coil）
Weight (unit in package) 30KG
Dimension (package) 60 x 60 x 45 cm1) W-21 is another outcome of “I want to do the best possible” idea, nothing too much to say, these are our crazy products for extreme audiophiles.
2) We have an ambitious plan to make a mega open baffle with this and Pt-15.
3) It uses underhung motoring system to realize accurate and deep bass while eliminating distortion.
4) With Lii Song paper cone of unique material, it has a wide frequency response and transparent sound so that it can coordinate with a great variety of full range drivers.
5) Double coil design let it competent to be adapted with amplifiers and connect in parallel or in series with other driver units, according to impedance.
6) Optimized for open baffle usage so you can have fun with these simply using a baffle.
7) As Lii Song driver developed by the same creator, this is a wonderful companion for other Lii Song full range drivers, especially on open baffle.
