[bcschmerker4]

In pro audio, Eminence Speakers manufactures a sub-line of the Beta musical-instrument speaker range that can take compression drivers with a 1-3/8-18 threaded snout, firing them coaxially through the Beta voice coil. Some other speaker manufacturers use the same principle in competing musical-instrument applications; TANNOY® does the same thing for near-field monitors. I reckon that this principle can be scaled down to coaxial in-ear speakers, using any of a specific subset of the Knowles® balanced-armature line-up, or alternately a piezoelectric dome speaker, as the tweeter to fire coaxially through the voice coil of a dynamic woofer driver. What earphone and earset manufacturers have products with coaxial transducers; and how difficult are they to balance as two-ways?

 

[tgx78]

Maybe Anker Soundcore Liberty 2 Pro

maybe Shouer Tape

 

[bcschmerker4]

@tgx78 The ANKER® soundcore™ Liberty 2 Pro™ (Mfr. Model A3909Z11; listed at $141.97 at Wish.com as of 18 March 2020) appears worthy of a listing in Head Gear -> Headphones -> Wireless, but as of 18 March 2020 nobody has uploaded an Item report for this product. Astria Coaxial Acoustic Architecture™ uses an 11mm dynamic woofer and balanced-armature tweeter coaxially in each of two mirror-imaged ultracompact Bluetooth® 5.0 cordless units. @Kuan China has uploaded a review hereof in Forums -> Equipment Forums -> Portable Headphones, Earphones and In-Ear Monitors.

#needitem #wireless

 

[jant71]

AZLA's infinity driver...

 

[bcschmerker4]

@jant71 The AZLA® approach to a coaxial earphone, as illustrated in advertising for the Model AZLA-01R in-ear monitor set, apparently uses a dynamic compression driver venting co-axially with a special-design Knowles® balanced-armature full-range improved from medical hearing aids; the Bull's-Eye Driver™ is apparently meant to eliminate, insofar as possible, any phase conflicts between the transducers.