Coaxial earphones: How tricky to build?
Mar 18, 2020 at 1:04 AM Thread Starter Post #1 of 5

bcschmerker4

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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?
 
Mar 18, 2020 at 1:09 AM Post #2 of 5

tgx78

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Maybe Anker Soundcore Liberty 2 Pro

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maybe Shouer Tape
 
Mar 19, 2020 at 11:35 PM Post #3 of 5

bcschmerker4

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@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
 
Mar 20, 2020 at 7:26 AM Post #4 of 5

jant71

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AZLA's infinity driver...
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Mar 21, 2020 at 12:04 AM Post #5 of 5

bcschmerker4

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@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.
 

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