====== Sony WH-CH720N ======


The Sony WH-CH720N headphones are over-ear buetooth headphones with Active Noise Canceling (ANC), Passthrough, virtual surround sound, and multi-device pairing capabilities. They support both Bluetooth and auxiliary (Aux) connections.

==== Purpose: ====

  * General purpose headphones
  * Suitable for VR/XR/MR due to audio passthrough feature
  * No latency in cable connection, 30-40ms latency via Bluetooth

==== Quick Guide: ====
  * Pairing: Press Bluetooth button for 5 seconds until the indicator light blinks.
  * Get the latest software and drivers [[https://www.sony.de/electronics/support/wireless-headphones-bluetooth-headphones/wh-ch710n/downloads|here]]


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==== Full-duplex audio connection ====

(simultaneous headphone and microphone use) is possible like so:

1. **full-duplex using minijack cable:**
  *    Connect to a (TRS) Y-splitter-cable (one socket, two connectors) to the headphones with the provided AUX cable.
  *    Connect Y-cable outs to the Headphone outs and Microphone inputs of [[https://amzn.eu/d/05VuzZop|USB audio adapter]].
  *    NB: headphone audio will be mono

2. **full-duplex via Bluetooth:**
   - Functional on iOS and MacOS (Versions? Software?)
   - Not possible on an RPi (still testing possibilities).

3. **full-duplex combining Bluetooth and Cable (AUX):**
   - Bluetooth connection (in or out) not possible when headphones are already connected by aux cable (out or in).
   - More details [[https://helpguide.sony.net/mdr/2966/v1/de/contents/TP1000776886.html|here]]


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Below are Frequency Response and Isolation curves from [[https://www.soundguys.com/sony-wh-ch720n-review-99305/|this review.]]

{{:hardware:sony_freqresponse_headphones.png?direct&600|Sony WH-CH720N Headphones Frequency Response}}
{{:hardware:sony_freq_response_mic.png?direct&600|Sony WH-CH720N Microphone Frequency Response}}
{{:hardware:sony_noise_isolation.png?direct&600|Sony WH-CH720N Noise Isolation Response}}
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Use [[https://www.sony.de/electronics/headphones-connect-app|Sony Headphones Connect]] app for calibrating Frequency Response via EQ.
</WRAP>

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==== Images: ====

 Headphones, case, and included cables:
{{:hardware:img_3836.jpg?600|}}
{{:hardware:img_3838.jpg?600|}}
{{:hardware:img_3839.jpg?600|}}
{{:hardware:img_3840.jpg?600|}}
{{:hardware:img_3841.jpg?600|}}
{{:hardware:img_3844.jpg?600|}}


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<WRAP center round help 100%>
**Troubleshooting:**
  * Issue: Microphone's low input level (only loud noises or direct contact were audible).
  * Solution: Software update from Sony requiring a reset.
  * Reset Process: Press Bluetooth and middle button on the right side simultaneously until Bluetooth indicator blinks four times.
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==== Further information ====


  * [[https://www.sony.de/electronics/support/wireless-headphones-bluetooth-headphones/wh-ch720n/manuals|German Manuals]]
  * [[https://www.sony.com/electronics/support/wireless-headphones-bluetooth-headphones/wh-ch720n/manuals|English Manuals]]
  * {{ :hardware:son_wh-ch720n_manual_de.pdf |}}
  * {{ :hardware:sony_wh-ch720n_manual_english.pdf |}}