Main trade-off
Sony ULT FIELD 1
Stereo needs another FIELD 1 and the setting survives power-off. It does not support Party Connect.
Head-to-head
Sony ULT FIELD 1 vs FIELD 3: Which daily job needs the upgrade?
The short answer
Choose ULT FIELD 1 for the smaller carry or to match an owned FIELD 1 for stereo. Choose FIELD 3 to charge a phone, switch between two connected phones or join Party Connect. Phone charging needs the speaker switched on with enough battery. Stereo and Party Connect turn off its two-phone connection. Both explicitly exclude USB music playback. Check the power supply and cable before expecting a shorter recharge or mains-powered Bluetooth standby.
Before you choose
The reasoning and the trade-offs
A FIELD 3 does not complete the FIELD 1 pair you had planned
If the household already owns FIELD 1 and wants separate left and right channels, the documented partner is another FIELD 1. FIELD 3 has its own same-model stereo route and Party Connect, rather than acting as a universal upgrade partner. FIELD 1 also retains its stereo setting after power-off. When one unit returns to a separate room, end that pair in the app instead of assuming Off cleared it. Choose FIELD 3 for its own supported group plan, and accept that its group modes remove two-source multipoint while they are active.
What this is based on
An existing speaker and later solo reuse crossed with same-model stereo, retained state and the FIELD 3 multipoint trade.
Main trade-off
Sony ULT FIELD 3
The 1.2 kg speaker adds carry weight. Multipoint is unavailable during group modes and cannot simply be disabled in ordinary mode.
Sony ULT FIELD 1
- Choose it for
- Carry the 650 g FIELD 1 when phone charging and Party Connect are unnecessary.
- Match an existing FIELD 1 for stereo, then end the retained pair in the app before returning to solo use.
- Main trade-off
- Stereo needs another FIELD 1 and the setting survives power-off. It does not support Party Connect.
Sony ULT FIELD 3
- Choose it for
- Use documented phone output with the speaker on and sufficient battery reserve.
- Use two-phone handoff in ordinary Bluetooth mode, accepting its loss during stereo or Party Connect.
- Main trade-off
- The 1.2 kg speaker adds carry weight. Multipoint is unavailable during group modes and cannot simply be disabled in ordinary mode.
About this comparison
Sony ULT FIELD 1 vs ULT FIELD 3 for shared phones and days away. Compare exact speaker groups, phone charging and the full cable-and-adapter routine.
These adjacent Sony portables are plausible choices for one speaker moving around home and into a travel bag. A same-model partner, phone-power requirement or different charging routine can justify the step up, while both already document occasional calls.
Winner by situation
Start with what you need it to do
An owned FIELD 1 needs a left/right stereo partner
The documented stereo route requires two of the same exact model.
- Sony ULT FIELD 1
- Better fit
- Sony ULT FIELD 3
- Not suitable
A smaller carry matters and the phone already has backup power
FIELD 1 is 650 g against FIELD 3’s 1.2 kg, before charging accessories.
- Sony ULT FIELD 1
- Better fit
- Sony ULT FIELD 3
- Caution
The speaker should top up a phone while switched on
FIELD 3 documents this output, with adequate reserve and a dry port required.
- Sony ULT FIELD 1
- Caution
- Sony ULT FIELD 3
- Better fit
Two-source multipoint must remain active during FIELD 3 Party Connect
FIELD 1 lacks Party Connect and FIELD 3 disables multipoint in that mode.
- Sony ULT FIELD 1
- Not suitable
- Sony ULT FIELD 3
- Not suitable
What matters in practice
The differences that matter
A FIELD 3 does not complete the FIELD 1 pair you had planned
If the household already owns FIELD 1 and wants separate left and right channels, the documented partner is another FIELD 1. FIELD 3 has its own same-model stereo route and Party Connect, rather than acting as a universal upgrade partner. FIELD 1 also retains its stereo setting after power-off. When one unit returns to a separate room, end that pair in the app instead of assuming Off cleared it. Choose FIELD 3 for its own supported group plan, and accept that its group modes remove two-source multipoint while they are active.
How we reached this conclusion
An existing speaker and later solo reuse crossed with same-model stereo, retained state and the FIELD 3 multipoint trade.
Phone backup power adds a return-home charging job
FIELD 3 can supply the phone running the playlist, which may remove the need to carry a separate backup for that specific outing. The speaker must stay on, low battery can prevent output, and switching it off stops the phone charging. Check that power is flowing in the intended direction, then close the cap after disconnecting. This convenience spends speaker reserve that must be replenished before the next trip. Choose the smaller FIELD 1 when you already have a phone-power plan and do not need FIELD 3’s documented output, rather than carrying the larger speaker just because it is newer.
How we reached this conclusion
One battery supplying another crossed with required on-state, direction, reserve and next-use preparation. No number of phone charges is inferred.
The connector shape does not settle the recharge kit
FIELD 1’s supplied lead supports 1.5 A, and its five-hour reference refill uses that current with the speaker off. The supported 3 A route needs an appropriate cable as well as the supply. FIELD 3 gives a roughly 3.5-hour reference at 9 V 3 A, while its remote Bluetooth standby separately requires USB-PD mains power. Choose FIELD 3 if those properly powered home and turnaround routines matter enough to accept the 1.2 kg carry. If the speaker charges overnight and is manually switched on, FIELD 1 can fit without buying around conveniences you do not use.
How we reached this conclusion
A travel charging kit crossed with current capability, voltage, cable rating and mains-only standby. Reference times remain conditional.
Choice A
Sony, SRSULT10W.UC
Sony ULT FIELD 1
Carry the 650 g FIELD 1 when phone charging and Party Connect are unnecessary.
- Best matched use
- Carry the 650 g FIELD 1 when phone charging and Party Connect are unnecessary.
Checked facts
- Match a stereo partner: Two FIELD 1 units. Pair setting remains after power-off.
- Use more group functions: Party Connect explicitly unsupported.
- Handle phone power: Manual documents USB input for the speaker and excludes music through it.
- Pack and recharge: 650 g. Five-hour reference at 1.5 A while off. Supplied cable supports 1.5 A.
Choice B
Sony, SRSULT30H.UC
Sony ULT FIELD 3
Use documented phone output with the speaker on and sufficient battery reserve.
- Best matched use
- Use documented phone output with the speaker on and sufficient battery reserve.
Checked facts
- Match a stereo partner: Two FIELD 3 units with current firmware.
- Use more group functions: Party Connect and Stereo Pair remove multipoint.
- Handle phone power: Documented phone output requires on-state and battery reserve. USB audio unsupported.
- Pack and recharge: 1.2 kg. About 3.5 hours at 9 V 3 A while off.
Meaningful differences
What changes the fit
| What changes | Sony ULT FIELD 1 | Sony ULT FIELD 3 | Why it matters |
|---|---|---|---|
| Match a stereo partner | Two FIELD 1 units. Pair setting remains after power-off. | Two FIELD 3 units with current firmware. | Buying up the range does not complete a FIELD 1 stereo pair. |
| Use more group functions | Party Connect explicitly unsupported. | Party Connect and Stereo Pair remove multipoint. | Expanded speaker grouping changes how two household phones can take turns. |
| Handle phone power | Manual documents USB input for the speaker and excludes music through it. | Documented phone output requires on-state and battery reserve. USB audio unsupported. | FIELD 3 provides the verified phone-power route, with a deliberate recharge afterward. |
| Pack and recharge | 650 g. Five-hour reference at 1.5 A while off. Supplied cable supports 1.5 A. | 1.2 kg. About 3.5 hours at 9 V 3 A while off. | A larger power supply and heavier speaker may be worthwhile only if that refill window matters. |
What you give up
Every choice has a cost
If you choose Sony ULT FIELD 1
- The supplied cable supports 1.5 A. A supported 3 A charging route needs an appropriate different cable and supply.
If you choose Sony ULT FIELD 3
- Bluetooth standby needs USB-PD mains power. Phone charging stops when the speaker is switched off and can fail at low reserve.
Recommendation switch
The decision flips if...
The smaller carry or matching an owned FIELD 1 is the real need
Choose Sony ULT FIELD 1. Choose FIELD 1 and plan its cable rating and retained stereo setting.
Phone output or ordinary two-phone handoff is worth the larger kit
Choose Sony ULT FIELD 3. Choose FIELD 3, retaining on-state, reserve and group-mode restrictions.
What matters in practice
Before you choose
A larger Sony can add useful power and group functions without becoming a stereo partner for the smaller one already owned.
What this comparison cannot tell you
- No inference that FIELD 1 lacks multipoint from a missing manual heading.
- Neither supports USB music playback.
- Both phone-call routes are device and application dependent, not certified conferencing claims.
What the facts say
What the comparison shows
Useful conclusions from the current portable bluetooth speakers comparison, followed by the checked facts used to reach them.
See the checked facts and calculation notes
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Sony ULT FIELD 1 |
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| Sony ULT FIELD 3 |
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Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
Sony ULT FIELD 1
Carry the 650 g FIELD 1 when phone charging and Party Connect are unnecessary.
Match an existing FIELD 1 for stereo, then end the retained pair in the app before returning to solo use.
See price & reviews on AmazonSony ULT FIELD 3
Use documented phone output with the speaker on and sufficient battery reserve.
Use two-phone handoff in ordinary Bluetooth mode, accepting its loss during stereo or Party Connect.
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