ER4XR Extended Response Earphone
Etymotic Research$290-$320
Features
- Same balanced armature driver as ER4SR, tuned with 3–4 dB of extended sub-bass
- 35–42 dB of passive noise isolation via deep-insertion ear tips
- Channel-balanced to within 1 dB at Etymotic's Illinois laboratory
- Detachable Kevlar-reinforced MMCX cable
- Signed compliance graph included with each pair
Description
The ER4XR pairs the same precision-matched balanced armature driver as the ER4SR with 3–4 dB of additional sub-bass extension for listeners who prefer a fuller low-end response. Each pair is channel-balanced to within 1 dB at the Elk Grove Village, Illinois facility and ships with a signed compliance graph.
Made in the USA
Assembled and channel-balanced at Etymotic Research's Elk Grove Village, IL facility.
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