Knowles ED-29689, Balanced Armature Driver is used by Etymotic Research ER-4 and other Hi-End IEMs
We provide it mainly for the ER4 and X10 single BA IEM DIY kits.
Know more about ER4, the $200+ classic single BA driver unit IEM
Note as ED 29689 is the only BA driver unit in ER4, the sound quality of ER4 is 100% determined by it!
About eh ED series of Knowles BA drivers
Compact size: 0.081cc
Appreciable output power: 112dB nominal, 129dB maximum
Two-terminal zero-bias andthree-terminal center-tapped configurations.
Undamped, screen damped, internallydamped, and FerrofluidTM damped responses with 2dB, 4dB or 6dB peak amplitude.
Numerous port locations.
Wide range of coil impedances.
Available with Ferrofluid TM technology for screenless damping and improved shock performance.