Here are the testing words from GoDaddy PWS Team.

By 99994375 | May 22, 2018

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		Mundorf	Jantzen	Solen	Intertechnik	Result
Trade name	XQ coils	BL140	Perfect Lay	Air Coils	CU 1.4mm
Wheeler formula	Yes	No	Yes	No	No	Higher DCR and lower Q factor
Varnish Impregnated	Yes	Yes	Yes	No	No	Varnish impregnated coils offer the lowest possible microfonic distortion
Hysteresis tension devices	Yes	No	No	No	No	Inconsistent winding factor and DCR’s
Precision Orthocyclic tooling matched to .001”	Yes	No	No	No	No	Improved matching of coils. Lower inductive tolerance.
Computerized layer winding	Yes	No	No	No	No	Improved layering and lower DCR.
Purity Guarantee Click here for details	Yes	No	No	No	No	Unknown purity and conductivity can result in smeared sound
Tolerance	1%	3%	1%	3%	3%	Lower tolerances can assure your coil is closer to the advertised value
1.0mh #14AWG coil DCR CLAIMED	0.208 Ω	0.30 Ω	0.21 Ω	NA	0.28 Ω	Higher DCRs result in increased power loss and reduced performance.
1.0mh #14AWG coil DCR MEASURED	0.211 Ω	0.306 Ω	0.215 Ω	NA	0.293 Ω	Higher DCRs result in increased power loss and reduced performance.

		Mundorf	Jantzen	Solen	Intertechnik	Result
Trade name	EQ coils	L100	Air coils	NA	CU 1.0mm
Wheeler formula	Yes	No	No	NA	No	Higher DCR and lower Q factor
Bonded coil	Yes	Yes optional	Yes	NA	No	Bonded coils offer lower microphonic distortion
Hysteresis tension devices	Yes	No	No	NA	No	Inconsistent winding factor and DCR’s
Precision Orthocyclic tooling matched to .001”	Yes	No	No	NA	No	Improved matching of coils. Lower inductive tolerance.
Computerized Orthocyclic layer winding	Yes	No	No	NA	No	Improved layering and lower DCR.
Purity Guarantee Click here for details	Yes	No	No	NA	No	Unknown purity and conductivity can result in smeared sound
Tolerance	2%	3%	3%	NA	3%	Lower tolerances can assure your coil is closer to the advertised value
1.0mh #18AWG coil DCR CLAIMED	0.471 Ω	0.49 Ω	0.55 Ω	NA	0.60 Ω	Higher DCRs result in increased power loss and reduced performance.
1.0mh #18AWG coil DCR MEASURED	0.482 Ω	0.531 Ω	0.572 Ω	NA	0.581 Ω	Higher DCRs result in increased power loss and reduced performance.