JBL Flip 6 vs Sony ULT Field 1 Speaker

Buy the Sony ULT Field 1 in Black (model SRSULT10B.UC) if hands-free calls, the included carry strap and the lower observed price matter most; buy the JBL Flip 6 in Black (model JBLFLIP6BLKAM) if you want the lighter 1.21-lb build, the faster 2.5-hour reference recharge and the PartyBoost path to multi-speaker stereo. Both are IP67-rated portable Bluetooth speakers with advertised 12-hour battery life, but they spend their engineering differently. Sony puts a physical ULT button on the speaker that boosts bass on demand, a built-in microphone with echo canceling for hands-free calls, and a detachable multi-way strap in the box. JBL counters with a smaller and lighter cabinet, a published 2.5-hour recharge time, and PartyBoost, which pairs two compatible speakers for stereo or links multiple speakers for bigger sound. On 09/15/2026 the exact Sony variant was In Stock on Amazon US at $98.00 with delivery as soon as Monday, Sep 21, shipped and sold by Amazon.com, while the exact JBL variant was listed at $129.95, shipped and sold by Amazon.com, with the page showing the low-stock line "Only 1 left in stock - order soon" on the featured offer.

Choose by your situation

Specifications compared

Sony ULT Field 1 in Black: the calls, strap and stamina pick

The ULT Field 1 (SRSULT10B.UC) in Black is the speaker to pick when the phone stays in your pocket. The mechanism is concrete: a built-in electret-condenser microphone with echo-canceling technology carries hands-free calls through the speaker, and the manual additionally documents triggering the phone voice assistant from the speaker, so a call or a voice command does not require digging the phone out. The detachable multi-way strap in the box gives a carry handle, a loop and hanging options with no accessory purchase, and the ULT button boosts bass instantly for bass-heavy tracks, with STAMINA mode in the Sony Music Center app stretching playtime when you need it. Sony is unusually honest about the battery: the manual rates about 12 hours at volume 25 with ULT POWER SOUND on but only about 3 hours at maximum volume 50, measured with its specified music source, so plan on the lower end for loud parties. Its limits are bulk and recharge speed: about 8.1 inches wide and 1.4 lb against the JBL 7-inch 1.21-lb body, and the manual reference recharge takes about 5 hours with a 1.5A adaptor that is not in the box, with the waterproof cap required to be closed afterward to keep the IP67 sealing. The listing showed 4.7 out of 5 stars across 2,802 ratings with an Amazon's Choice flag, which are listing displays, not test results.

JBL Flip 6 in Black: the light, fast-refill, pair-it-later pick

The Flip 6 (JBLFLIP6BLKAM) in Black is the speaker to pick when every ounce and every recharge minute counts. The mechanism is explicit in the published spec block: a 1.75 x 3 in woofer with 20W RMS plus a 0.6 in tweeter with 10W RMS covering 63Hz-20kHz, Bluetooth 5.1 with A2DP 1.3 and AVRCP 1.6, and a 17.28Wh battery that refills in 2.5 hours on a 5V/3A supply, in a 7 x 2.6 x 2.8 in body weighing 1.21 lb. PartyBoost is the growth story: pair two PartyBoost-compatible speakers for stereo or link multiple speakers for bigger sound, managed through the JBL Portable app, so a second Flip 6 later becomes a stereo pair rather than a spare. Its limits are features and the observed offer: about $32 more than the Sony at the observed prices, no microphone or speakerphone function is described in its listing or spec block, no strap ships in the box, and the featured Amazon.com offer showed the low-stock line "Only 1 left in stock - order soon" at $129.95 on 09/15/2026, so confirm availability before deciding. The listing showed 4.7 out of 5 stars across 24,518 ratings, which is a listing display, not a test result.

Battery and charging, read carefully

Both makers advertise 12 hours, but only Sony publishes the curve, and the conditions differ, so do not treat the two 12-hour figures as the same promise. Sony's manual states about 12 hours at volume 25 with ULT POWER SOUND on and about 3 hours at maximum volume 50, and notes real time varies with volume, songs, temperature and usage. JBL's spec block states up to 12 hours dependent on volume level and audio content, with no volume curve published in the observed sources. On charging, JBL's 2.5-hour reference at 5V/3A refills materially faster than Sony's about-5-hour reference with a 1.5A adaptor while the speaker is off, and Sony ships no AC adaptor, so a speaker that charges overnight suits the Sony while top-ups between outings suit the JBL. Neither 12-hour figure is a measured result from this publication; no listening or battery test was performed.

Where to check the exact variants

Compare the Sony ULT Field 1 in Black, model SRSULT10B.UC (observed In Stock at $98.00 on 09/15/2026, shipped and sold by Amazon.com, delivery as soon as Monday, Sep 21) against the JBL Flip 6 in Black, model JBLFLIP6BLKAM (observed at $129.95 on 09/15/2026, shipped and sold by Amazon.com, page showing "Only 1 left in stock - order soon" on the featured offer). As an Amazon Associate I earn from qualifying purchases. If calls, the strap and the lower price matter most, take the Sony; if minimum weight, fastest refill and the PartyBoost stereo path matter most, take the JBL. Prices, stock lines, sellers and delivery dates move; re-check the exact-variant pages before buying.

Sources and further reading

1. Amazon.com - JBL Flip 6 Portable Waterproof Speaker, Black (B09GJVTRNZ)
2. Amazon.com - Sony ULT Field 1 Wireless Bluetooth Portable Waterproof Speaker, Black (B0CXL4FQBK)
3. Guitar Center - JBL Flip 6 Portable Waterproof Bluetooth Speaker Black, specifications
4. Sony Help Guide - ULT FIELD 1 Specifications (official manual)
5. Sony Help Guide - ULT FIELD 1 Charging the speaker (official manual)