Name: Sennheiser HDB 630
Brand: Sennheiser

The HDB 630 includes a BTD 700 USB-C transmitter. It gives a compatible computer or phone another route to the headphones when its built-in Bluetooth support is a poor match for the codec you want. That solves a more specific problem than simply owning a wireless headphone. Fit, power and the type of input still affect how the system behaves.

Fit & Sound Quality

42 mm drivers
Closed over-ear cups
311 g without cable

RTINGS tested the original black HDB 630. With the intended seal it measured balanced bass, mids and highs, but the fit changed the response more than on some competing designs. The selected Lunar Silver version is a later finish. Reseating the cups or moving glasses arms can be a more audible change than switching wireless codecs. ¹

Connectivity

BTD 700 included
USB-C digital audio
Powered analog input

For a laptop, the dongle provides its own wireless link. USB-C audio is another choice at a desk. An analog lead is useful with a source that has only a headphone jack, but it does not turn these into passive headphones. RTINGS measured roughly 30 ms on the active analog path. A competitive player sensitive to timing should take that into account. ¹

Battery Life

Up to 60 hours with ANC
USB-C charging

RTINGS measured about 54 hours of playback on its black test pair. ¹ Sennheiser rates up to 60 hours with ANC. A ten-minute USB-C top-up is rated for up to six more hours, useful before a journey when there is time for a short charge but not a full one.

Noise Cancellation

Adaptive ANC
Transparency mode

RTINGS found strong isolation on its black test pair. ¹ That makes the HDB 630 useful beyond the listening desk, but only while it has power. Even an analog seat-back connection runs through the headset electronics. Charge before a flight and keep the cable handy for the seat output; neither the cable nor a better Bluetooth codec replaces the battery.

EQ & Crossfeed

Parametric equalizer
Crossfeed
Smart Control Plus app

The parametric equalizer lets you choose the frequency and width of an adjustment. That gives you a way to ease one troublesome band without broadly turning down the bass or treble. Crossfeed addresses a different problem: older stereo recordings sometimes put an instrument almost entirely in one ear. Try crossfeed on one of those tracks before deciding whether it suits the rest of your library.

Alternatives

The Momentum 4 Wireless is a bassier alternative for someone who mostly streams from a phone. ¹ If you already enjoy its tuning, the case for moving to the HDB 630 rests on what you would actually use: finer EQ adjustment, crossfeed or the USB transmitter for a second source.

Verdict

The HDB 630 is for a listener who can name a source the transmitter improves or an adjustment they want to make. Try the fit first. The included accessories make an already good seal more useful across devices, but cannot correct an inconsistent one.

Sennheiser HDB 630 review

Pros

Cons