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The left earcup jack on the M-100s has been sacrificed for a micro-USB port, though the new headphones can still be cabled up to a source player by plugging in the supplied cable to the right earcup. The left earcup is home to a Li-ion battery, while the right plays host to the electronics. Though the battery is expected to last for years, the company is looking into starting a replacement program, and cautions against users replacing the battery themselves, as V-Moda techs will take care not to interfere with the sound seal and air flow dynamics.

Of course, the main difference between old and new is the addition of low power CSR BlueCore wireless technology, with a 33 ft (10 m) range and support for AAC+, AAC, MP3 and SBC audio codecs. On the choice of supported codecs, specifically the lack of aptX support, Kolton told the head-fi community that "there is only ~320 kbps bandwidth with Bluetooth so we optimized for AAC+ (what the head engineer of A_e told me to do) plus used a micro VAMP with our knowledge of VAMP DAC/Amps for wireless mode but without coloring the sound. 320 is 320, is aptX really that [much] better than AAC+ in 320? Not really, they are both compression algorithms that are damn good ...

"aptX has some cool features in the future, but now 99 percent of consumers cannot take advantage of it (like aptX LL of 40 ms). If you own a Samsung ATIV Book 9 Plus notebook and are using WAV/AIFF/FLAC you can benefit from aptX if you can ensure it isn't using AAC/SBC somehow. Most iTunes/streaming apps now use AAC so we don't have to go through another two processing stages. This is why I believe it is the best sounding Bluetooth headphone for all devices, but it is even better wired and with a DAC/AMP. True to our analog heritage."

To the top of the right earcup are three buttons. The middle plastic pusher is a multi-function button for playback control and taking calls, the other two are volume up and down. There's a three-way switch to the bottom rear which powers the headphones on and off, and puts them in Bluetooth search mode. Unfortunately, having a smooth surface, we found it a bit of a fiddle to use when on the head (and not much better in the hands). Textured metal or something similar may have been a better design choice here.

Powering on the headphones results in a short echo-like tone sounding. There are different tones for activating Bluetooth and connection confirmation, and for powering off – bringing back memories of a simpler time playing platform games on a Speccy in the 1980s.

A tiny hole can be seen bottom forward on the right earcup which leads to an omnidirectional microphone with -42 dB (at 1 kHz) sensitivity to facilitate phone conversations or conflabs with virtual assistants like Siri, Cortana and Google Now. This proved adequate for all but the windiest of conditions, but we could hear our own voice during calls. The inline mic on the supplied cable offered more telcon clarity, which can be boosted further by plugging in an optional BoomPro audio cable.

The earcups are home to patent-pending 50 mm dual-diaphragm drivers, with inner and outer rings keeping a claimed precise, deep bass from bleeding over into other frequencies. "We optimized the dual-diaphragm drivers for the new Crossfade Wireless and did additional airflow mechanics tuning due to the added electronics and battery," Kolton revealed to us. The frequency response is wide, at between 5 Hz and 30 kHz, sensitivity is given as 107 dB (at 1 kHz 1 mW) and the headphones have an impedance of 30 ohms.

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Keeping the headphones in place is a "virtually indestructible" Steelflex headband coated in faux leather that's been found to exceed MIL-STD-810G test standards for durability and ruggedness. BLISS memory foam cushions help to ensure a good acoustic seal. The V-Port air flow system doesn't let too much ambient noise in, but does result in a little music leaking out. It's probably not enough to annoy fellow commuters, but may be worth keeping in mind.

Plugging the supplied Kevlar-reinforced SpeakEasy audio cable into the input jack on the right earcup, automatically disables the battery, Bluetooth, digital sound processing engine, Micro-VAMP and other active electronic components for a pure analog listening experience.

As our review units came directly from V-Moda, an extra pair of 3D-printed shields were included. Buyers can opt to design a custom logo for 3D printing or laser engraving, with shields available in a range of materials, including silver, gold and platinum (you can even choose different colored screws). The Wireless headphones also come supplied with a Giger-esque form-fitting carry hard shell case. Cables can be secured to the lid using a Velcro-backed accessory board and a carabiner clip is included to allow for hanging from a backpack.

It was rather refreshing to hear subtle (and sometimes lost) details over Bluetooth – from the vibrant pop of the strings on fantastic fingerpickers like Adrian Legg's Pass the Valium to the grit and growl dual vocal tracks on Tallahassee from Swamp Cabbage, or the rasp of air at the lower end of the tuba-driven Moving Stones by Hazmat Modine to the throaty groans accompanying the fine fret work of Stevie Ray Vaughan on his impassioned rendition of Little Wing. Also a tick in the positive column was a distinct lack of Bluetooth hiss, between track buzz, or active circuitry hum.

Surprisingly, the sounds presented by active and passive modes, digital vs. analog or whatever you want to call it, were pretty closely matched. The digitally-massaged sound was perhaps a touch crisper, especially at the higher reaches, and vocals had a sharper edge, while the stereo image was a touch more spacious, and the sound more rounded and warmer when cabled. Ether way, the Crossfades delivered a vibrant, detailed, spacious and wonderfully clear listening experience (the main advantage of wired over wireless being the ability to listen to hi-res digital music with the help of a USB DAC or vinyl through the home hi-fi system).

Plugging in the supplied audio cable while the circuits are active will immediately shut the power off and the headphones flow straight into analog mode. Conversely, removing the jack will reactivate the circuits automatically, but the Bluetooth connection may need to be re-established – our Windows laptop and all-in-one computer didn't auto-pair, for example, but our iPhone and Android tablet did.

"Multitasking users can also pair the headphones with two sources at a time, such as smartphone and laptop for work or smartphone and smartwatch for a workout," said Kolton. "You can press play/pause on one device and the other will start." This functionality proved useful when friends or family wanted to share a new tune discovery.

On the downside, watching online videos in wireless mode can result in lip sync issues. Online content from sources such as YouTube and Vimeo faired much worse than optical media like DVD or Blu-ray, however, with hardly any noticeable lag on the latter. Where other Bluetooth headphones may leave you high and dry in this regard, Crossfade Wireless users can plug in the supplied audio cable for zero latency watching and listening. Lag-free use is also vital for media production work, mixing live tracks at a gig and intensive gaming, of course, so this is a welcome addition.

V-Moda says that the Crossfade Wireless users should enjoy up to 12 hours of continuous streaming playback. A multicolored status light on the power/pairing button pulses red when charging, flashes lilac/blue when powered on or pairing and gives off a steady lilac/blue glow when paired with a source device.

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A full charge using the supplied flat-wired (1.06 m/3.47 ft) micro-USB cable plugged into a spare port on a laptop took less than 2 hours, which offered a good 10 hours of continuous wireless playback at comfortable volume levels. This translated to two or three points higher than the power-on default level, with the volume of the source player set to 50 percent.

As premium wireless headphones go, the Crossfades undercut competition price tags by some margin. The new MW60 over-ears from Master & Dynamic, for example, come in at US$549, Bang & Olufsen's H7s will cost you $449, and Parrot's stylish and capable Zik 2.0 and B&W's P5 Wireless headphones are both listed at $400. By contrast, the new V-Moda Wireless headphones are available in a choice of four colors for $300.