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Which Portable Speaker Fits Your Calls and Grouping Setup?

Pick Bose when you need a built-in speakerphone or want to group a Flex 2 with a compatible Bose Shortcut speaker. Pick WONDERBOOM 4 when speakerphone is unnecessary and you plan a W3/W4 Double Up pair with a button-controlled mono/stereo choice. Keep the two Bose speakers within 30 ft (9 m) of each other and each within 30 ft (9 m) of the streaming device.

Published by Pickoryx · Published 2026-10-02

Source checked 2026-10-02 06:57 UTC

Products compared

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The buying question

Do you need a built-in speakerphone, or are you choosing mainly by the speaker group you want to build?

Bose documents a built-in microphone, phone-call controls and grouping with compatible Bose shortcut speakers. WONDERBOOM 4 has no microphone listed in its official specification and documents Double Up pairing with WONDERBOOM 3 or 4 speakers, with mono/stereo modes. Keep the two Bose speakers within 30 ft (9 m) of each other and each within 30 ft (9 m) of the streaming device.

Quick verdict

Choose Bose SoundLink Flex Portable Speaker (2nd Gen), Black (model 887612-0100) if

  • You want call controls on the speaker and a built-in microphone documented by Bose.
  • You intend to group with a compatible Bose Bluetooth speaker that has a Shortcut button. Keep the two Bose speakers within 30 ft (9 m) of each other and each within 30 ft (9 m) of the streaming device.
View Bose SoundLink Flex Portable Speaker (2nd Gen), Black (model 887612-0100) on AmazonPaid link
When the recommendation changes
  • If calls are not part of your speaker use, the microphone difference matters less; base this part of the decision on the pairing workflow you will use.
  • If you already own a second speaker, verify its model family: Bose describes linking to a compatible Bose Bluetooth speaker with a Shortcut button; WONDERBOOM describes W4/W3 Double Up.

The differences that matter

Calling Microphone Controls

Bose SoundLink Flex Portable Speaker (2nd Gen), Black (model 887612-0100)

Bose identifies a built-in microphone and speakerphone on SoundLink Flex (2nd Gen). Its play/pause button answers an incoming call, double-press declines or ends a call; the manual also documents handling a second call.[1, 2]

Ultimate Ears WONDERBOOM 4, Active Black (model 984-001876)

Logitech's WONDERBOOM 4 specification explicitly lists Microphone: N/A. Its listed physical controls cover playback, volume, Outdoor Boost/Podcast modes, and Double Up; it is not a speakerphone option when you need a microphone in the speaker.[4, 5]

What this changes: If you need the speaker itself to send your voice during a phone call, the documented built-in microphone and call buttons make the Bose the feature-fit choice. If calls through the speaker are unnecessary, that requirement does not rule out the WONDERBOOM 4; the sources do not compare microphone quality or call clarity.[1, 2, 4]

The better fit depends on your priorities

Speaker Grouping Workflow

Bose SoundLink Flex Portable Speaker (2nd Gen), Black (model 887612-0100)

Flex (2nd Gen) links with a compatible Bose Bluetooth speaker that has a Shortcut button. The default Shortcut links speakers; the manual says same-model pairs play Stereo, while different-model pairs play Party. A paired group is limited to one other speaker at a time. Keep the two Bose speakers within 30 ft (9 m) of each other and each within 30 ft (9 m) of the streaming device.[1, 2]

Ultimate Ears WONDERBOOM 4, Active Black (model 984-001876)

WONDERBOOM 4 Double Up pairs with another WONDERBOOM 4 or WONDERBOOM 3. Hold the center button on each speaker to pair, then hold either center button to toggle mono Double Up or two-channel stereo; the Bluetooth button exits Double Up.[3, 5]

What this changes: Choose around the speaker you already own or plan to add: Bose documents a compatible Bose shortcut-speaker group, with different models in Party mode; WONDERBOOM documents Double Up specifically for W4/W3 and a button-controlled mono/stereo choice. These are separate ecosystems, and the cited sources do not show cross-brand pairing. Keep the two Bose speakers within 30 ft (9 m) of each other and each within 30 ft (9 m) of the streaming device.[2, 3, 5]

The better fit depends on your priorities

Best for your routine

A two-speaker group when the second speaker is a WONDERBOOM 3 or 4

Best fit: Ultimate Ears WONDERBOOM 4, Active Black (model 984-001876)

Based on listed features, not comparative testing.

Logitech documents Double Up between WONDERBOOM 4 and WONDERBOOM 3/4, with a physical mono/stereo toggle. Choose this only when that is the speaker family you intend to pair.

View Ultimate Ears WONDERBOOM 4, Active Black (model 984-001876) on AmazonPaid link

Linking with a compatible Bose Shortcut speaker

Best fit: Bose SoundLink Flex Portable Speaker (2nd Gen), Black (model 887612-0100)

Based on listed features, not comparative testing.

Bose documents Flex 2 linking with a compatible Bose Bluetooth speaker that has a Shortcut button; the mode depends on whether the models match. Keep the two Bose speakers within 30 ft (9 m) of each other and each within 30 ft (9 m) of the streaming device.

View Bose SoundLink Flex Portable Speaker (2nd Gen), Black (model 887612-0100) on AmazonPaid link

Value and trade-offs

One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.

No offer comparison is made here. Weigh any live price gap against whether speakerphone calling or the documented speaker-pair workflow matters to your setup.

Price history was not assessed, so this comparison makes no timing recommendation. Check current checkout prices and availability when choosing.

Limitations

  • This comparison is based on manufacturer product, support and owner-guide documents; no hands-on or controlled listening comparison was performed.
  • Bose and WONDERBOOM grouping are separate maker-specific workflows; the cited documents do not establish cross-brand pairing.
  • No independent sound-quality, loudness, battery-runtime, durability or call-quality winner was established.
  • Current offers were not compared and no price history was assessed.
  • Verify the exact color and package contents shown in the offer you select.
  • For Bose Bluetooth-speaker linking, both speakers must be within 30 ft (9 m) of each other and each within 30 ft (9 m) of the streaming device; place them in the same room or outdoor area without obstructions.

Questions shoppers ask

Can the WONDERBOOM 4 take calls like a speakerphone?

Logitech's specification lists its microphone as N/A. Bose, by contrast, lists a built-in microphone and speakerphone on Flex 2, with the play/pause button used to answer, decline and end calls.

Can a Flex 2 pair with a WONDERBOOM 4?

The cited instructions describe maker-specific groups: Bose links Flex 2 with a compatible Bose Bluetooth speaker with a Shortcut button; WONDERBOOM Double Up is for WONDERBOOM 3 or 4. They do not establish cross-brand pairing. Keep the two Bose speakers within 30 ft (9 m) of each other and each within 30 ft (9 m) of the streaming device.

Methodology and sources

Compared the documented speakerphone/call-control workflow and the compatible-speaker grouping steps for the Bose SoundLink Flex (2nd Gen) and WONDERBOOM 4. Recommendations describe feature fit only; no listening test or comparative performance measurement was performed.

AI assistance was used to organize the source research and draft the comparison; material claims were checked against the cited manufacturer documents.

View 5 sources
  1. 1.Shop SoundLink Flex Bluetooth Speaker (2nd Gen)Bose US · Official specifications · Source checked 2026-10-02 06:04 UTC
    Evidence used on this page
    • Product details, Technical Specifications and FAQ: lines 365-408; speaker grouping lines 441-443: Identifies SoundLink Flex Portable Speaker (2nd Gen); lists a built-in microphone and speakerphone, answers how its play/pause control answers, declines, and ends calls, and documents Bose compatible-speaker linking.
  2. 2.SoundLink Flex Portable Speaker (2nd Gen) Owner's GuideBose · Official specifications · Source checked 2026-10-02 06:57 UTC
    Evidence used on this page
    • English printed pp. 22-23: call controls/microphone; pp. 30-32: compatible Bluetooth speaker linking, both 30-ft placement conditions and Stereo/Party modes: The guide lists call answer/end/decline controls and explains that the speaker microphone extends the connected device microphone. It states that Flex 2 links with a compatible Bose Bluetooth speaker; same-model speakers use Stereo while different models use Party, and the default shortcut links speakers. Keep the two Bose speakers within 30 ft (9 m) of each other and each within 30 ft (9 m) of the streaming device.
  3. 3.WONDERBOOM 4 (984-001876 variant)Ultimate Ears US · Official specifications · Source checked 2026-10-02 06:04 UTC
    Evidence used on this page
    • Product page: WONDERBOOM 4 identity and Double Up section, lines 34-36 and 106-112; URL identifies 984-001876 variant: The US variant page identifies WONDERBOOM 4 and its two-speaker Double Up workflow, which provides stereo by pairing two speakers. It names speaker families it does not pair with; it does not establish compatibility with Bose speakers.
  4. 4.Specification - WONDERBOOM 4Logitech Support · Official support · Source checked 2026-10-02 06:04 UTC
    Evidence used on this page
    • General Product Specifications: model M/N SR0192; Multifunction Controls and Microphone rows, lines 50-52 and 79-83: The official spec maps WONDERBOOM 4 to M/N SR0192, lists the center-button music/Double Up functions and explicitly records Microphone as N/A.
  5. 5.Getting Started - UE WONDERBOOM 4Logitech Support · Official support · Source checked 2026-10-02 06:04 UTC
    Evidence used on this page
    • Control Music lines 59-60; Double Up lines 101-112: The model-specific guide describes center-button playback controls, pairing a WONDERBOOM 4 with another WONDERBOOM 4 or WONDERBOOM 3, holding the center button on each, toggling mono/two-channel stereo, and leaving Double Up with the Bluetooth button.

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