If you want wireless streaming with active noise cancellation and automatic pause-and-resume behavior, choose Bowers & Wilkins FP39691; if you need wired listening with an open-back design and 50 mm drivers, choose Fostex TH616.
For streaming in changing environments, I’d pick the Bowers & Wilkins. For a quieter listening space where an open-back presentation matters more than isolation, the Fostex is the more focused choice.
• Bowers & Wilkins FP39691: Adaptive active noise cancellation, Bluetooth 4.1 with aptX HD, and up to 22 hours of Bluetooth listening with noise cancellation; its trade-off is that wireless battery life varies with the connection and cancellation mode.
• Fostex TH616: Open-back construction, 50 mm drivers, and a detachable wired cable; its trade-off is that it has no wireless connection or noise cancellation.
• For hands-free listening routines: The PX can pause when an ear cup is lifted and enter sleep mode when set down.
• For a dedicated listening setup: The TH616’s open-back design and wood housings prioritize a different kind of listening experience, not everyday isolation.
• Choose the PX for streaming on the move; choose the TH616 for wired listening in a space where sound can remain open to the room.
The Bowers & Wilkins FP39691, also called the PX, is the more practical fit for streaming when your surroundings change. It combines Bluetooth 4.1 with aptX HD and adaptive active noise cancellation, so you can listen wirelessly and adjust the cancellation to your preference. The listed frequency response is 20 Hz to 20 kHz, and its angled drivers are intended to create a more natural stereo perspective. Those details point to a headphone designed for everyday listening, rather than a wired-only setup.
Its strongest convenience feature is the way it responds to being handled. Lift an ear cup to pause playback; put the headphones down and they enter a power-saving sleep mode; pick them up to resume. That could suit someone moving between a desk, a commute, and short interruptions throughout the day. Battery life is listed as up to 22 hours with Bluetooth and noise cancellation, up to 29 hours with Bluetooth without cancellation, up to 33 hours using ANC with a wired connection, and up to 50 hours wired without ANC. The mode matters, so the longest figure should not be treated as the expected wireless streaming runtime.
The PX is an over-ear headphone with a 3.5 mm connection as well as Bluetooth, and a headphone cable is included. It also supports app-based firmware updates through the Bowers & Wilkins Headphones app. That gives it some flexibility when you want to switch from wireless use to a cable, although it remains a powered, feature-rich design rather than a purely wired headphone. Its trade-off is straightforward: you are choosing battery-dependent wireless convenience and noise cancellation, not an open-back listening experience.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-24 · 8 min read · Independent comparison
The Fostex TH616 is for someone who wants a wired, open-back headphone and is prepared to listen in a suitable environment. Its 50 mm dynamic drivers and open-back construction distinguish it from the PX’s closed, noise-cancelling use case. Fostex describes the sound as balanced and robust, with a bio-dyna diaphragm intended to support deep bass, natural midrange, and smooth treble. The stated frequency range is 20 Hz to 20 kHz. These are design and specification details, not a guarantee that every listener will prefer its tuning.
The physical construction is a central part of the TH616’s identity. Its housings use black walnut, with aluminum and plastic also listed among the enclosure materials. The wood is precision-machined, and the design is described as balancing structural rigidity with acoustic considerations. In practical terms, this is a headphone whose appeal includes its materials and workmanship as well as its driver specification. It is an over-ear model, supplied with a 3 m detachable cable, a 1/4-inch connector, and a leatherette carrying bag.
The major compromise is the open-back, wired design. There is no Bluetooth connection and no noise cancellation, so it is not the natural pick for a noisy commute, a shared office, or listening while moving around without a cable. Open-back headphones also do not provide the kind of isolation the PX is designed to offer. But if you listen in a quiet room and want a direct wired connection with an open presentation, the TH616 fits that brief more closely.
Who should skip it: Skip the TH616 if you need wireless streaming, active noise cancellation, or a headphone meant to isolate you from your surroundings.
• Best for wireless streaming → Bowers & Wilkins FP39691. Bluetooth 4.1 and aptX HD let it connect wirelessly to compatible devices, while the Fostex is wired only.
• Best for adapting to environmental noise → Bowers & Wilkins FP39691. It has adaptive active noise cancellation; the TH616 has no noise-control feature listed.
• Best for a quiet-room open-back setup → Fostex TH616. Its open-back design is the defining contrast with the PX’s noise-cancelling approach.
• Best for long stretches without a charging break → It depends on the connection mode. The PX lists up to 22 hours with Bluetooth and ANC, rising to up to 29 hours with Bluetooth and no ANC. The TH616 is wired, so it does not rely on a rechargeable headphone battery.
• Best for listening without a wireless connection → Fostex TH616. Its detachable cable and included 1/4-inch connector suit wired setups. The PX can also be used with its included headphone cable, but it retains wireless features and multiple power modes.
• Best for automatic playback pauses → Bowers & Wilkins FP39691. Its sensors can pause playback when an ear cup is lifted and put the headphones to sleep when set down.
• Best for a wood-housing design → Fostex TH616. Black walnut is used for its housings, with aluminum and plastic also listed in the construction.
• Best for a flexible commute-to-desk routine → Bowers & Wilkins FP39691. Wireless operation, adjustable cancellation, and its wired option make it the more adaptable of these two for changing situations.
Buying Considerations
Next, consider how you feel about charging and cables. With the PX, the advertised battery life changes according to whether you use Bluetooth, ANC, or a wired connection. The clearest comparison for wireless use is up to 22 hours with both Bluetooth and ANC, or up to 29 hours with Bluetooth and ANC switched off. The TH616 avoids that battery calculation because it is wired, but the 3 m cable is part of the listening setup. That length may be useful at a desk, but it is still a cable to manage.
The product names also invite different expectations. The PX is a feature-oriented over-ear headphone with adaptive cancellation, app-supported firmware updates, and sensor-driven playback behavior. The TH616 puts more emphasis on its open-back design, 50 mm drivers, and black walnut housings. Neither list of features makes one a universal fit. The right match depends on whether you value convenience and environmental control or a wired, open-back design.
Finally, don’t choose solely by one specification. The PX’s up-to figures describe different operating modes, not a single fixed battery result. The TH616’s driver size and materials describe its design, but they cannot determine personal preference by themselves. If your priority is the best earbuds for streaming, note that neither product is an earbud: both are over-ear headphones. And if you are looking for sleep headphones for streaming, these are also over-ear models rather than sleep-specific designs. For sports, neither sheet describes a sports-focused fit or water resistance, so I would not label either one the best sports earbuds for streaming.
I would buy the Bowers & Wilkins FP39691 for streaming because it combines Bluetooth, adaptive noise cancellation, and useful automatic playback behavior in one over-ear headphone.
Its battery life is mode-dependent, and it cannot replace the TH616’s open-back wired design for someone who specifically wants that style of listening.
But for a routine that may move between different environments, the PX is the more flexible choice.
In my opinion, that flexibility makes it the stronger pick for everyday streaming.
FAQ
For wireless streaming, the PX is the clearer fit: it has Bluetooth 4.1 with aptX HD and adaptive active noise cancellation. The TH616 is wired, so it suits a fixed listening setup rather than cable-free use.
The TH616 is a wired headphone and has no wireless battery requirement listed. It comes with a 3 m detachable cable and a 1/4-inch connector; the PX, by contrast, has listed battery runtimes for its different operating modes.
Check the current price on Amazon using the page’s button. For the product decision itself, weigh the PX’s wireless features and cancellation against the TH616’s wired open-back design and wood construction.
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