Reference Silver Etymotic Research ER4 XR ER4 SR upgrade cable

(1 customer review)


new v3.0 (available now in Ultimate awg24 multistrand litz version).
Very noticeable upgrade and step over the standard cable!


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We advice at least 150h of burn in time before any critical listening sessions.

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SKU: 18REF03ER4 Category: Tags: ,

• Carefully handmade braided cable consists of 4 cores of AWG28 (0.33mm ⌀) solid silver 5N purity wire.
• Terminated with beautiful gold plated 3.5mm Carbon plug with thermal adhesive and transparent heatshrink on one end.
• Gold plated IEM plugs on the other side applied firmly using thermal adhesive.
• Soldered with Mundorf 4% fine silver audio solder.
• Woven Teflon Litz construction is ideal to deliver RFI and EMI rejection and provides low capacitance.
• 5N silver transmits electrical signals faster and with less distortion than ordinary OFC wires.
• High grade Teflon insulation gives a predominant air dielectric and is regarded as the best insulator for bare cable.
• Please note – silk sleeving is available till the Y split.

Reviews (1)

1 review for Reference Silver Etymotic Research ER4 XR ER4 SR upgrade cable

  1. James Reinhart (verified owner)

    I have had some of the finest headphones, Stax 727 Amp and high end Lamda, Sennheiser 650, Micro Seiki electrostatics, all the way back to Koss Electrostatics and currently have Sennheiser HD700 and Etymotic ER4ER. I found about your company by chance of looking for the best cables for rebuilding and Tri=amping an Maggie 3.6R (they need it badly) when I found your site.

    I didn’t want to go overboard so I purchased these cables with Carbon 3.5mm straight and used regular mail waiting 3 weeks. IT WAS WORTH THE WAIT. I am absolutely flabbergasted (amazed). Playing Adele 21 I get a better sound from fundamental to the finest nuances that I can’t hear with the HD800 that I can listen to and the equal of the 700 and much more detailed than the 650. This kind of sound I don’t usually get except for electrostatics as Jazz ensembles one can hear the pages turn and conversation in the background like I can with my old Pablo recordings.

    By the way, the HD700 measures and sounds almost exactly like the HD800 but are more precise i.e. faster from mid lower frequencies on up (I’ll catch heck for this statement but the 700 is faster but the 650 has an even, easy listening sound).

    I’m telling everyone that I know that likes to listen to music and especially the late 60s early 80s vinyl! Digital still sounds like digital and is always converted to PCM by ESS and most others except PS Audio, EMM, DCS the 3 companies that are far beyond my pocket book of correct DSD 1 step digital to analog conversion done right (the schematics don’t lie and not all of DCS is truly DSD.

    I have some of the best early pressings of classical DG (Von Karahan, Ansermet, Osawa, Marinnera and other conductors of several classical performances that were award winners but lucky for me, no one was interested in Holst, Saint Saens, Beethoven, Smetana, Ravel, Debussy, and the like during the rock era.

    It’s time to heat listen for a hole night of vinyl. The best cartridges are going to make magic as they have in the past as even the Oppo 205 can’t match or come close to my Ruby Z.

    My next purchase will be Master Line for the HD700s.

    The only thing that is better is being there or perhaps when or if I get done with my 3rd triamped system that I’m working on (first two were custom Accuton/Focal with Threshold crossovers…).

    I would like to add that I have used Nordost Red Dawn and Heimdal and these surpass them. I have Heimdal 2 on my Phono and Red Dawn for all other connections all were burned in. The difference is considerable as these IEM have never sounded close to the other fill sized headphones with the fundamentals, harmonics, separation of instruments and the activity of the stage during live performances of Jazz and Classical. These differences are even noticable on the variety of Big Band, R&B Blues, to such performers as Carol King, Jackson Brown, Pete Seger, Show Tunes of old as these are classics in their own right of Rogers and Hart, Gershwin Bros… and even older classic rock without the 8-128 tracks that are used now. My only regret is that I did not get the copper connections.

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