Bowers & Wilkins (B & W) announced the Bluetooth headphones “Px7 S2” equipped with a noise canceling function. It is scheduled to go on sale in late July 2022, and is expected to be sold for around 60,000 yen (tax included). Let’s take a look at the features of the new top-of-the-line headphones from B & W, the prestigious British audio brand.Check the basic specs! While inheriting the B & W headphone development concept, it has become an imadoki specification
The Px7 S2 announced this time is positioned as
the successor to the hit model “PX7” of the Neucan-equipped Bluetooth headphones released in 2019. Although the model number bears the name “S2”, it is not a minor change model, but a newly designed one as the latest generation model of B & W headphones.
B & W entered the headphone market in 2010. Since that time, in addition to pursuing sound quality as headphones handled by prestigious speaker brands, we have continued to develop products that focus on design by adopting high-quality materials. The idea is inherited in the Px7 S2 announced this time. While inheriting the philosophy that is the core of B & W headphones, the parts related to sound quality have been newly designed, and the feature is that they have been brushed up to modern specifications that are also intended for use in telework.
The details of the sound quality design will be described later, but first, let’s introduce the basic specifications and design with photos.
▼ Supports Bluetooth and noise canceling, and also has a USB-DAC function
As for the basic specifications as headphones, the Bluetooth codec supports AAC / SBC as well as aptX HD / aptX / aptX Adaptive, and supports transmission of up to 48kHz / 24bit. The profile corresponds to A2DP / AVRCP / HFP / HSP / BLE GATT (Generic Attribute Profile). Multipoint connection is possible, assuming use in telework.
B & W headphones are equipped with an active noise canceling function from products with “PX” model numbers such as “PX7” and “PX5”, but of course this unit also supports it. It is said that the noise canceling quality is improved based on the original system adopted in the conventional model PX7, and in addition to reducing the noise in the mid-low range as much as possible, the focus was on the sound quality by turning on / off the noise canceling function. To suppress the change of. It is said that the noise canceling function has been tuned with the highest priority given to enjoying music. It also has an ambient function (external sound capture).
In addition, the headphones have a built-in USB-DAC, and if you connect it to a computer with a USB-C cable, you can play back up to 48kHz / 24bit while charging the battery. The product also comes with a 1.2m USB-C-USB-C cable and a 1.2m USB-C-3.5mm stereo mini-plug cable. By the way, it also has a mounting detection sensor, and if you remove the headphones while playing music, playback will stop automatically. The feature can also be turned off in an app described below.
▼ Supports control from the “Bowers & Wilkins Music” app
Like B & W’s wireless audio system “Formation” series and soundbar “Panorama 3”, this unit supports control from the “Bowers & Wilkins Music” app. From the app, you can pair mobile devices, adjust the sound with an equalizer, switch between the noise canceling function and the ambient function, check the battery level, and so on.
In addition, the battery can be driven for up to 30 hours, and it will be fully charged in 2 hours from the zero battery state. It also supports quick charging, which allows you to play for 7 hours with a 15-minute charge.
Newly designed driver unit structure
From here, let’s take a look at the newly designed driver unit and internal structure that are the heart of this machine. It is equipped with a 40mm diameter dynamic full-range driver, but the point is that it is a unit with a free edge structure that does not fix the circumference of the diaphragm, like the drive unit of a general speaker.
Most of the general headphones cannot perform uniform piston motion because the circumference of the diaphragm is fixed, which causes distortion. However, in the case of the free edge structure adopted in this machine, the entire diaphragm is uniform. Since it performs piston motion, it can move more air and generate more energy. And the material of the diaphragm uses a composite material of bio-cellulose and resin to increase the rigidity of the cone. The material is lightweight, highly rigid, and has high internal loss.
Furthermore, the material called Kapton is adopted for the cylinder part of the voice coil, which enhances the lightness, improves the impulse response, and improves the accuracy of the sound. In addition to changing the magnet to a stronger one, the magnetic circuit is designed to suppress distortion by placing a copper cap on the short coil pole piece.
In addition, we are particular about the angle of the driver unit in the ear cup, and adopt the concept of “angled drive unit” that arranges the unit in a position parallel to the ear hole. By arranging the units at an angle of 15.4 °, the structure keeps the distance from the radial surface of each drive unit to the ear constant, which enhances the descriptive power and focus performance when playing music.