Year	Vendor	Model	″	kg	Hz	KHz	Ω	W	dB
~1990	Celestion	3	5	4.0	75	20	8	60/80	86
		5	6	4.7	70			90	88
	∞	Reference 61i	2×8	21.0	35	25	6	150/200	91
		Kappa 8.2i Series II	12	35.0	32	35	3.5	300	89
2004	创新科技	T2900			40	20	-	6+9	-
2017	JBL	Control One	4	2.4	80		8	50/100/200	89