RoHS Compliant

Copper
PURITY GUARANTEE

Purity Guarantee: This is a simple but true statement. ERSE’s copper coil wire is guaranteed to meet 99.99% purity and is made from virgin CDA 101 oxygen free cathode copper. ERSE guarantees that each product series marked with Purity Guarantee Logo is manufactured with 99.99% pure copper. Extreme high purity means extreme high quality sound.

Many of our competitors claim to offer world class coils, even those in Europe. But when tested in a metallurgic lab ERSE’s purity meets 99.99% while a competitor in Denmark only met 97.1%.

This low purity is equivalent to recycled copper pipe, definitely not audio quality. Imagine your high quality amplifier is connected to about 12 feet of high quality cable which then connects to your speaker. If using our competitor’s coils your high quality amplifier and high quality cable are connected to a low purity coil which contains on average 300 feet of coil wire. This low purity copper coil has just compromised your system and degraded the sound quality.

Source your “Q series” coils from ERSE and be guaranteed that you are getting the purest sound possible with our Purity Guarantee.

The diagram here shows the flow of electrons in two sets of coils hooked up to amp. The system that uses an ERSE’s high purity coil is brighter and quicker.

  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.