The catch
Sennheiser HDB 630
A USB data port is taken up by the transmitter, which stores only one headphone pairing. HDB 630 does not receive aptX Lossless.
Side by side
Sennheiser HDB 630 vs Bowers & Wilkins Px7 S3: Both drop Bluetooth on USB, HDB includes a transmitter
Quick verdict
HDB 630 is right when a compatible USB source needs the included BTD 700 transmitter, or when you want parametric EQ and crossfeed. Px7 S3 is right when your source already supports the wireless route you want and five-band EQ is enough. Bluetooth disconnects on both for USB listening, and analog playback needs power on both. So neither one handles USB music alongside phone Bluetooth, or a cable backup with a dead battery.
Before you buy
Why, and what it costs you
A pricey codec can go unused on your current phone
If you plan to keep your phone for several years, check which audio connection it supports before choosing Px7 S3 for aptX Lossless. HDB 630 offers another route by including BTD 700 for compatible USB sources, but it receives aptX Adaptive and not Lossless. The practical question is whether your existing source already does the job or needs an accessory. Neither label guarantees an audible improvement.
Where this comes from
For aptX Lossless, Px7 S3 needs a matching source. HDB 630 includes a transmitter for compatible USB data sources, though the headphones receive aptX Adaptive. Hubs and charging passthrough need to be verified separately.
The catch
Bowers & Wilkins Px7 S3
A compatible source is required for aptX Lossless. The headphone feature list does not give an ordinary phone that capability.
Sennheiser HDB 630
- Why pick it
- Plug the BTD 700 from the box into a compatible USB source and skip buying a separate transmitter.
- Make deliberate music adjustments with parametric EQ and crossfeed, knowing no sound-quality advantage is promised.
- The catch
- A USB data port is taken up by the transmitter, which stores only one headphone pairing. HDB 630 does not receive aptX Lossless.
Bowers & Wilkins Px7 S3
- Why pick it
- Work with an aptX source that is already compatible, so you don’t pay for a transmitter you don’t need.
- Go with five-band EQ if it covers the adjustments you make, and USB and analog listening are available too.
- The catch
- A compatible source is required for aptX Lossless. The headphone feature list does not give an ordinary phone that capability.
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What this page compares
The included transmitter, USB limits and music controls, compared. Work out which premium pair fits your phone and laptop so you don’t pay for a codec you can’t use.
Each pairs premium wireless ANC with USB and analog listening. Choose a complete source-and-headphone setup. The longest list of audio formats should not decide it.
Which one fits
Pick the situations that sound like you
Your compatible USB source needs a wireless transmitter in the package
BTD 700 is included with HDB 630. For Px7 S3 you need a source, or a transmitter chosen separately, that supports the codec you want.
- Sennheiser HDB 630
- Better fit
- Bowers & Wilkins Px7 S3
- Depends
Your source already handles the Px7 S3 codec you want
That existing route works for Px7 S3. An extra HDB 630 transmitter may add little for this buyer.
- Sennheiser HDB 630
- Good
- Bowers & Wilkins Px7 S3
- Better fit
USB music and phone Bluetooth have to run together
Bluetooth is disconnected in both documented USB procedures.
- Sennheiser HDB 630
- Not suitable
- Bowers & Wilkins Px7 S3
- Not suitable
You would like to try crossfeed on stereo recordings with strong separation
Crossfeed is something HDB 630 supplies outright. The five-band EQ on Px7 S3 is a different adjustment and not an equivalent feature.
- Sennheiser HDB 630
- Better fit
- Bowers & Wilkins Px7 S3
- Depends
The analog lead has to work after a charge was missed entirely
Analog playback needs headphone power on both.
- Sennheiser HDB 630
- Not suitable
- Bowers & Wilkins Px7 S3
- Not suitable
In practice
Differences you will notice
A pricey codec can go unused on your current phone
If you plan to keep your phone for several years, check which audio connection it supports before choosing Px7 S3 for aptX Lossless. HDB 630 offers another route by including BTD 700 for compatible USB sources, but it receives aptX Adaptive and not Lossless. The practical question is whether your existing source already does the job or needs an accessory. Neither label guarantees an audible improvement.
How we worked this out
For aptX Lossless, Px7 S3 needs a matching source. HDB 630 includes a transmitter for compatible USB data sources, though the headphones receive aptX Adaptive. Hubs and charging passthrough need to be verified separately.
Both let down the same plan for wired music and phone availability
A parent or on-call worker might want USB laptop music with phone Bluetooth still connected. Both manuals require disconnecting Bluetooth for USB listening. Spending more on one or the other does not solve that combined requirement. Use a tested Bluetooth multipoint setup, watch the phone separately or pick another product that documents the exact mixed-connection behavior.
How we worked this out
Bluetooth must be disconnected during USB listening according to both manuals. Neither headset can guarantee you will hear a child or an emergency notification.
A sound preference you want to keep needs the right kind of control
If older recordings with hard left-right separation bother you, HDB 630 gives you selectable crossfeed to try along with parametric EQ, while Px7 S3 has a simpler five-band adjustment. HDB 630 is therefore worth a look for someone who wants those controls, and Px7 S3 can be enough when ordinary tonal changes do the job. Crossfeed is a listening preference and not a hearing treatment or proof of more accurate sound.
How we worked this out
Crossfeed and parametric EQ are listed by Sennheiser, and five-band EQ by Bowers & Wilkins. They offer different adjustments and imply no measured preference or hearing benefit.
Plug in your setup
Which headphones suit the way you listen?
Start with how you listen. Charging over USB is not the same as playing audio over USB, and some headphones need power even on a cable. These answers are placeholders until you apply your own.
Sennheiser HDB 630
Passes these checksPlays over Bluetooth.
Bowers & Wilkins Px7 S3
Passes these checksPlays over Bluetooth.
Battery figures are maker claims for the stated mode. They do not reflect measured travel time. Volume, codec, calls and battery age all change runtime. Closed earcups can still leak some sound. Weight alone does not predict comfort. USB audio needs a compatible source and cable. This check does not judge sound quality, mic quality or amplifier power.
Option A
Sennheiser, 700445
HDB 630
Plug the BTD 700 from the box into a compatible USB source and skip buying a separate transmitter.
- Best for
- Plug the BTD 700 from the box into a compatible USB source and skip buying a separate transmitter.
Facts we checked
- Wireless source equipment: The standard US HDB 630 package includes a BTD 700 USB-C transmitter. It stores one headphone profile and needs a compatible USB data source.
- USB and phone Bluetooth: USB audio supports computer input and output up to 24-bit/96 kHz. The setup procedure requires disconnecting Bluetooth.
- Analog with an empty battery: Analog playback requires the headphones to be powered on, including when Bluetooth is not used.
- Music adjustments: Parametric EQ and selectable crossfeed.
Option B
Bowers & Wilkins, Px7 S3
Px7 S3
Work with an aptX source that is already compatible, so you don’t pay for a transmitter you don’t need.
- Best for
- Work with an aptX source that is already compatible, so you don’t pay for a transmitter you don’t need.
Facts we checked
- Wireless source equipment: Supports aptX Lossless, Adaptive, HD and Classic with compatible sources, plus AAC and SBC. The package includes USB and analog cables.
- USB and phone Bluetooth: USB audio reaches 24-bit/96 kHz and disconnects Bluetooth. Analog playback also needs power and disconnects Bluetooth.
- Analog with an empty battery: Analog listening requires the headphones to be powered on.
- Music adjustments: Five-band EQ in the Bowers & Wilkins Music app.
Spec by spec
Where they really differ
| Spec | Sennheiser HDB 630 | Bowers & Wilkins Px7 S3 | In practice |
|---|---|---|---|
| Wireless source equipment | The standard US HDB 630 package includes a BTD 700 USB-C transmitter. It stores one headphone profile and needs a compatible USB data source. | Supports aptX Lossless, Adaptive, HD and Classic with compatible sources, plus AAC and SBC. The package includes USB and analog cables. | A bundled transmitter helps only when the source needs it and supports it. Native codec compatibility can make extra hardware unnecessary. |
| USB and phone Bluetooth | USB audio supports computer input and output up to 24-bit/96 kHz. The setup procedure requires disconnecting Bluetooth. | USB audio reaches 24-bit/96 kHz and disconnects Bluetooth. Analog playback also needs power and disconnects Bluetooth. | The proposed combination of USB music plus a Bluetooth phone is not offered by either. |
| Analog with an empty battery | Analog playback requires the headphones to be powered on, including when Bluetooth is not used. | Analog listening requires the headphones to be powered on. | If an empty-battery fallback is essential, pick another documented passive model. |
| Music adjustments | Parametric EQ and selectable crossfeed. | Five-band EQ in the Bowers & Wilkins Music app. | The kind of adjustment you will use is worth more than a generic premium-audio label. |
| Advertised endurance | Up to 60 hours at standard resolution or 45 hours at aptX Adaptive 24-bit/96 kHz with BTD 700 under the stated conditions. | Up to 30 hours with ANC on at average volume. | HDB 630 carries the longer published claims, though they are not a matched real-world battery test. |
Trade-offs
What each pick costs you
With Sennheiser HDB 630
- Bluetooth is disconnected during USB listening, and analog listening still needs power.
With Bowers & Wilkins Px7 S3
- Bluetooth is disconnected in both USB and analog modes. Neither cable works as a passive fallback on an empty battery.
Change of plan
When the answer changes
Your source needs a transmitter in the box or you specifically want crossfeed
Go with Sennheiser HDB 630. Those are concrete reasons to go with the HDB 630 package once USB compatibility is checked.
Your source already provides the Px7 S3 wireless format you want and five-band EQ is enough
Go with Bowers & Wilkins Px7 S3. Px7 S3 suits that existing setup and does not depend on the HDB 630 extras.
You need USB listening and phone Bluetooth at the same time
Neither model fits. Bluetooth is disconnected on both USB routes. Pick a different verified connection plan.
Decision guide
Before you buy
Better control over your music shouldn’t mean replacing a phone that works or losing touch with it while you’re at the laptop.
What this page can’t tell you
- We did no matched testing of sound, ANC, microphones or battery life.
- HDB 630 has an explicit, supported USB microphone route. An equivalent route on Px7 S3 was not established, but we don’t assume it is missing.
- Manufacturer documents disagree on HDB 630 weight, so it is left out.
By the numbers
What the data shows
What we found across the headphones we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Sennheiser HDB 630 |
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| Bowers & Wilkins Px7 S3 |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Sennheiser HDB 630
Plug the BTD 700 from the box into a compatible USB source and skip buying a separate transmitter.
Make deliberate music adjustments with parametric EQ and crossfeed, knowing no sound-quality advantage is promised.
See price & reviews on AmazonBowers & Wilkins Px7 S3
Work with an aptX source that is already compatible, so you don’t pay for a transmitter you don’t need.
Go with five-band EQ if it covers the adjustments you make, and USB and analog listening are available too.
See price & reviews on AmazonEach link opens in a new tab.
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