Short answer: the Zealot S78, though neither ranks well in its class. Both are rated 2.0/5 for sound quality (#111 and #112 of 113 boombox speakers), and the Zealot S78 costs $91.38 against $149 for the Pioneer PBM5, with sound quality a draw, the lower price decides it. Both are rated below 3.0/5 among the 113 boombox speakers, so if sound quality matters, consider the Harman Kardon Onyx Studio 9 instead, ranked #15 at $184.99.
Why pick the Pioneer PBM5: A loud karaoke boombox with two mic inputs, a guitar input, lights, a shoulder strap and a choice of USB-C or AC power. It links with other speakers (Auracast), which the Zealot S78 cannot. The catch: Williston Audio Labs was not impressed with its sound: there is very little bass below 100Hz, and the amplifier’s output has a big dip from 1.6kHz to 10kHz that leaves the upper mids and treble recessed.
The Zealot S78 is the longer-running, lighter option. A loud, rugged party speaker with full waterproofing, a power bank and wireless pairing for outdoor parties. It is rated for 40 hours of battery against 13 for the Pioneer PBM5. At 9.7 lbs (4.4 kg) it weighs noticeably less than the Pioneer PBM5 at 14.1 lbs (6.4 kg). It is rated IP67 against IPX5 for the Pioneer PBM5. The tradeoff: At high volume, reviews report distortion and fluctuating level, so its headline power is more useful below its maximum setting.
Buy the Zealot S78. Both are rated the same for sound quality, and it costs $57.62 less than the Pioneer PBM5.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Prices on this page were last checked November 14, 2026 at 6:17 PM 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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Specifications Side By Side
| Pioneer PBM5 | Zealot S78 | |
|---|---|---|
| Price | $149.00 | $91.38 |
| Ranked | #112 of 113 in Boombox Size Portable Bluetooth Speakers | #111 of 113 in Boombox Size Portable Bluetooth Speakers |
| Amplifier Power | 300W peak (Manufacturer specified), about 90W measured | 120W RMS / 150W peak |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Battery Life | 13 hours at 60% volume (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.4 | 5.3 |
| Dimensions | 8.9”H x 17.4”W x 8.1”D (226 x 442 x 207 mm) | 16.1” x 6.6” x 7.3” (410 x 167 x 185 mm) |
| Drivers | 2x 133mm (5.25”) woofers + 2x 51mm (2”) tweeters | 2x ~120mm (4.72”) woofers + 2x ~42mm tweeters + 2x passive radiators |
| EQ | Yes (presets + user EQ) | Yes (multiple modes) |
| Guitar Input | Yes | - |
| IP Rating | IPX5 | IP67 |
| Lights | Yes | - |
| Maximum SPL | 105dB at 2m (measured by Williston Audio Labs) | - |
| Microphone Input | Yes (2 inputs) | - |
| Omnidirectional | No | No |
| Party Mode | Yes (Auracast) | No |
| Power Input | USB-C or AC Power cord | USB-C |
| Strap | Yes (detachable shoulder strap) | Yes (detachable shoulder strap) |
| TWS | Yes | Yes |
| USB Playback | Yes (MP3 only) | Yes |
| Weight | 14.1 lbs (6.4 kg) | 9.7 lbs (4.4 kg) |
| MicroSD Playback | - | Yes |
| Stereo | - | Yes |
| Bluetooth Codecs | - | SBC |
| Power Bank | - | Yes (USB-A) |
| Built-in Microphone | - | No |
| Digital Aux Input | - | No |
Where the Ratings Come From
- Pioneer PBM5: reviews by Williston Audio Labs and AnotherReview ByFrank.
- Zealot S78: reviews by Jay’s Straight Up Reviews & More.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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