Short answer: the Brane X for better sound quality, the onn Portable FM Boombox for the lower price. The Brane X ranks #4 of 78 large speakers at $500. The onn Portable FM Boombox ranks #23 at $74.83, $425.17 cheaper.
What the onn Portable FM Boombox offers: Extremely good value. Reasonably deep bass, though not as deep as something like the JBL Xtreme 3, Soundcore Boom 2, or Tribit Stormbox Lava. IPX7 waterproof and floats. FM radio with 10 presets. 6 multicolor LED lighting effects. Can run on battery or corded power. Watch for: Reasonable frequency response, but not quite as smooth as some of the top-ranked speakers in this size. No custom EQ. Only available in the United States and Canada.
What the Brane X offers: The Brane X pairs a dedicated RAD subwoofer with two midrange drivers and two tweeters to achieve extraordinary low bass for a 3.5kg portable: its measured -10dB extension is 31Hz. Independent testing finds it loud, with well-balanced mids, a smooth treble balance and useful bass-level controls; Wi-Fi, AirPlay, Alexa, quality Bluetooth codecs and low-latency aux pass-through make it unusually versatile. Watch for: The front-facing design has only moderate dispersion, so sound changes noticeably off to the sides or behind it. Bass response shifts at maximum volume, the default aux mode has very high latency, and some listeners find the upper register edgy or need EQ to achieve their preferred balance. Its claimed 12-hour runtime and premium cost make it more of a compact high-end system than a carefree all-day speaker.
Buy the onn Portable FM Boombox when the price outweighs sound quality for you, and the Brane X when sound quality outweighs the price instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| onn Portable FM Boombox | Brane X | |
|---|---|---|
| Price | $74.83 | $500 |
| Ranked | #23 of 78 in Large Size Portable Bluetooth Speakers | #4 of 78 in Large Size Portable Bluetooth Speakers |
| Battery Life | 16 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| IP Rating | IPX7 | IP57 |
| Amplifier Power | 25W RMS (100W peak) | 200W |
| FM Tuner | Yes (10 presets) | - |
| Built-in Microphone | Yes | Yes |
| Power Bank | Yes (USB-A) | No |
| Power Input | USB-C | AC Power brick |
| Weight | 4.9 lbs (2.22 kg) | 7.7 lbs (3.5 kg) |
| Dimensions | 13.8" x 5.9" x 7.7" (350 x 149 x 195 mm) | 9.3" x 7" x 6.1" (236 x 178 x 155 mm) |
| Drivers | 2 speakers | 2x 2.5" midrange, 2x 0.75" tweeters + 6.5"x9" subwoofer |
| TWS | Yes | Yes |
| Party Mode | Yes (Party Sync, pairs with 1 other onn. speaker) | Yes (Brane app, up to 8 speakers) |
| App | No | No |
| EQ | No | No |
| Aux Input | Yes | Yes |
| Digital Aux Input | No | No |
| Removable Battery | No | - |
| Discontinued | No | - |
| Omnidirectional | No | No |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | aptX HD, aptX, AAC, SBC |
| Lights | Yes | - |
| Aux Latency | - | 295ms default, 33ms with aux pass-through |
| Bass Extension (-10dB) | - | 31Hz |
| Bluetooth Latency | - | 100ms |
| Maximum SPL | - | 106dB (measured by Alan Ross Reviews) |
| Stereo | - | Yes |
| Wi-Fi | - | Yes |
| Frequency Response | - | 30Hz - 20kHz (Manufacturer specified) |
Related Speaker Comparisons
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- Brane X vs JBL Xtreme 5
- Brane X vs Tribit Stormbox Lava
- Brane X vs Minirig 4 with subwoofer
- Brane X vs Minirig 3 with subwoofer
Prices on this page were last checked September 16, 2026 at 12:41 AM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
onn Portable FM Boombox: $74.83 Walmart eBay
Pros: Extremely good value. Reasonably deep bass, though not as deep as something like the JBL Xtreme 3, Soundcore Boom 2, or Tribit Stormbox Lava. IPX7 waterproof and floats. FM radio with 10 presets. 6 multicolor LED lighting effects. Can run on battery or corded power.
Cons: Reasonable frequency response, but not quite as smooth as some of the top-ranked speakers in this size. No custom EQ. Only available in the United States and Canada.
Full onn Portable FM Boombox review and specifications →
| Amplifier Power | 25W RMS (100W peak) |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 16 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 13.8" x 5.9" x 7.7" (350 x 149 x 195 mm) |
| Discontinued | No |
| Drivers | 2 speakers |
| EQ | No |
| FM Tuner | Yes (10 presets) |
| IP Rating | IPX7 |
| Lights | Yes |
| Omnidirectional | No |
| Party Mode | Yes (Party Sync, pairs with 1 other onn. speaker) |
| Power Bank | Yes (USB-A) |
| Power Input | USB-C |
| Removable Battery | No |
| TWS | Yes |
| Weight | 4.9 lbs (2.22 kg) |
- Links
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Brane X: $500 Amazon eBay
Pros: The Brane X pairs a dedicated RAD subwoofer with two midrange drivers and two tweeters to achieve extraordinary low bass for a 3.5kg portable: its measured -10dB extension is 31Hz. Independent testing finds it loud, with well-balanced mids, a smooth treble balance and useful bass-level controls; Wi-Fi, AirPlay, Alexa, quality Bluetooth codecs and low-latency aux pass-through make it unusually versatile. Measured bass extension of 31Hz (-10dB).
Cons: The front-facing design has only moderate dispersion, so sound changes noticeably off to the sides or behind it. Bass response shifts at maximum volume, the default aux mode has very high latency, and some listeners find the upper register edgy or need EQ to achieve their preferred balance. Its claimed 12-hour runtime and premium cost make it more of a compact high-end system than a carefree all-day speaker.
Full Brane X review and specifications →
| Amplifier Power | 200W |
|---|---|
| App | No |
| Aux Input | Yes |
| Aux Latency | 295ms default, 33ms with aux pass-through |
| Bass Extension (-10dB) | 31Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | aptX HD, aptX, AAC, SBC |
| Bluetooth Latency | 100ms |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 9.3" x 7" x 6.1" (236 x 178 x 155 mm) |
| Drivers | 2x 2.5" midrange, 2x 0.75" tweeters + 6.5"x9" subwoofer |
| EQ | No |
| Frequency Response | 30Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP57 |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Brane app, up to 8 speakers) |
| Power Bank | No |
| Power Input | AC Power brick |
| Stereo | Yes |
| TWS | Yes |
| Weight | 7.7 lbs (3.5 kg) |
| Wi-Fi | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: This speaker left me shocked! Brane X, they said it defies the laws of physics! More from alanrossreviews →
- Alan Ross Reviews: Brane X vs JBL Xtreme 5: Maximum Bass, No Mercy
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