Ole Wolff Elektronik A/S, Roedengvej 14, 4180 Soroe
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01-08-2021

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owolff.com ›› Acoustics news ›› 7mm high-end driver for earphones
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7mm high-end driver for earphones
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7mm high-end driver for earphones

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Excellent choice for Active Noise Control (ANC) and True Wireless (TWS) applications

Description:
This Ø7mm dynamic driver for high-end earphones is designed with focus on very high performance in earphones with ANC (Active Noise Control), TWS (True Wireless Stereo) and can also provide very good bass performance in leaky designs.

The OWR-0750T-32 features:


  • Excellent for Active Noise Control (ANC)

  • Ideal for high-end True Wireless (TWS) earphones

  • High leak tolerance (great bass in leaky designs)

  • On par with (and better than) the driver used in the acclaimed Sony WF-1000MX3 earphone



To learn more about Ole Wolff drivers for ANC, please check out the Design Support page regarding Active Noise Control

Date:
April 07 2021
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Beating some of the best

Comparison with the driver used in the excellent Sony WF-1000MX3 earphone

The Sony WF-1000MX3 is by many considered the industry leading earphone with both excellent ANC and overall sound quality.

In order to compare the OWR-0750T-32 with the Sony driver we carefully disassembled the WF-1000MX3 earphone and measured the Sony driver while still mounted in the nozzle part (black part to the right on the picture below) but without any air volume behind the driver. Next we replaced the Sony driver with the OWR-0750T-32 and ran the same test procedure under the exact same test conditions.
Beating some of the best
The excellent Sony WF-1000MX3 earphone (left) is considered the industry leading consumer ANC earphone. The Ole Wolff OWR-0750T-32 driver (middle) was tested using the nozzle part (right) from the earphone housing to make a fair 1:1 comparison between the drivers.

Lower distortion and better bass than the Sony WF-1000MX3 driver

The OWR-0750T-32 takes advantage of its extremely compliant Deep Drawn Diaphragm (Ole Wolff patent pending) which ensures low THD and excellent bass performance, as evident on the plots below (click to enlarge).

plots
SPL and THD comparison between the two drivers

The OWR-0750T-32 driver

Utilizing the Deep Drawn Diaphragm technique

The diaphragm design used in the driver takes advantage of Ole Wolffs Deep Drawn Diaphragm technology, which assures a maximum piston area and thereby the highest power efficiency to size ratio. High efficiency equals longer battery life which is key in ANC and True Wireless applications.
The OWR-0750T-32 driver
The OWR-0750T-32 driver

Mechanical dimensions

OWR-0750T-32_mech

Acoustic performance

High SPL and low THD: Ideal for Active noise Cancellation

Low distortion at high diaphragm excursions is one of the key parameters for obtaining good ANC performance. The OWR-0750T-32 can generate the very high sound pressure levels necessary in ANC applications with a minimum of distortion.

To learn more about Ole Wolff drivers for ANC, please check out the Design Support page regarding Active Noise Control



Acoustic performance
The driver generates very little distortion even at 10 mW @133 dBSPL in 2cc