The Etymotic ER4XR / ER4SR is a wired in-ear monitor with one balanced armature per channel, left and right channels matched within 1dB from 100Hz to 10kHz, and 35–42dB of passive isolation, offered in flat ER4SR or bass-lifted ER4XR tuning. It suits sound engineers, mixing technicians and critical listeners who want accuracy and strong passive isolation.
Who the Etymotic ER4XR / ER4SR is for
Mixing and reference listening: The ER4SR is tuned to be as precise and flat as possible, and every pair ships with a channel-matching compliance certificate.
A little more low end: The ER4XR adds 1–2dB below 200Hz and 3–4dB below 100Hz while keeping the ER4SR's mids and highs, and Etymotic says it is not bass heavy.
Noisy commutes and flights: Etymotic rates the passive isolation at 35dB with silicone tips and 42dB with foam tips, and puts most custom IEMs at about 25–28dB.
Long-term ownership: CNC-machined anodized aluminum shells pair with a reinforced, twisted cable that detaches at customized MMCX connectors, and the ACCU-Filters are user-replaceable.
Skip it if: you dislike deep-fitting eartips or want other brands' cables: Etymotic says the 35–42dB rating depends on eartips and insertion depth, and that its customized MMCX connector is unlikely to work with other makers' cables.
Etymotic ER4XR / ER4SR key specs
Versions: ER4XR Extended Response or ER4SR Studio Reference
Driver: Single high-performance balanced armature per channel
Genuine Etymotic stock. Free shipping on every order, 45-day returns.
Etymotic ER4XR / ER4SR vs similar options
vs SIMGOT EA2000: Pairs a dynamic driver with a passive radiator; pick the Etymotic ER4XR / ER4SR for a single balanced armature with channels matched within 1dB, flat or bass-lifted tuning and 35–42dB of rated isolation.
vs HIFIMAN RE2000 Pro: Also a single-driver IEM, with a nano-coated topology diaphragm, and costs less; pick the Etymotic ER4XR / ER4SR for balanced-armature channels matched within 1dB and 35–42dB of rated isolation.
Customized MMCX (detachable 5 ft twisted cable, 3.5mm gold-plated plug)
What's in the box
ER4XR or ER4SR earphones
Detachable 5 ft cable with 3.5mm gold-plated plug
Assorted silicone and foam eartips
Filter removal tool and replacement filters
Shirt clip
Zippered storage case
Channel-matching compliance certificate
Good to know
Buying from TonePier
Is this unit genuine?
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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