EQ - Perfect Lay Air Core

* click here for a certification of compliance

PURITY GUARANTEERoHS Compliant

“Best price verses performance of any air coil in the world… period!”

“Affordable world class quality”

Click HERE to compare ERSE’s EQ coils to other manufacturers. You will be able to see the difference and we guarantee you will hear it to!

ERSE’s EQ series of coils starts and ends with high purity copper wire, and offers our PURITY GUARANTEE! Anything less is just inferior. Quite simply put this is the most important part of our EQ coils. Many of our competitors claim to offer high purity wire, but ask them to give you the specs and they will most likely put you on hold for a half hour while they try to find the specifications.

ERSE continues to strive for perfection by winding the EQ coils to Wheelers formula on proprietary Orthocyclic tooling with orthocyclic computerized coil winders equipped with hysteresis tension devices. Although this is expensive due to the number of tools and special equipment required, science tells us and testing shows us it offers the best performance with the least amount of wire. Most of our competitors wind their coils with standard tooling to save on tooling and machine set up costs. Our orthocyclic tooling is machined to 0.0007” tolerances. This high level of machining precision allows us to offer the exact same coil time after time.

All EQ inductors are lead free (RoHS Compliant)

  • Perfect Lay Hexagonal Winding
  • Low D.C.R.
  • Computer Optomized Coil
  • Constant Inductance with
    Voltage and Current Variation
  • Utilizing Wheeler Formula
  • Linear A.C. Resistance
  • Very Low Magnetic Striction Distortion
  • RoHS Compliant

  erseaudio logo 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.
  erseaudio logo 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.