Short answer: the Bogasing Era S9 Pro if sound quality matters most, the Tronsmart Mirtune C3 Plus if price matters most. The Bogasing Era S9 Pro ranks #76 of 176 medium speakers, rated 3.4/5, at $85.99. The Tronsmart Mirtune C3 Plus ranks #83, rated 3.3/5, at $49.99, $36 cheaper.
The Bogasing Era S9 Pro is the longer-running pick. A metal grilled two way speaker with very long battery life, aux, microSD and USB-C audio playback, and stereo pairing. It is rated for 48 hours of battery against 12 for the Tronsmart Mirtune C3 Plus. It keeps a wired aux input, which the Tronsmart Mirtune C3 Plus lacks. Watch for: Oluv still heard a cheap, somewhat boomy character, and at high volume it loses control, with audible distortion and scratchiness where the Tronsmart Mirtune C3 Plus stays cleaner.
Why pick the Tronsmart Mirtune C3 Plus: An affordable waterproof speaker with a separate tweeter, app EQ, Auracast linking, stereo pairing and USB-C audio input. It links with other speakers (Auracast), which the Bogasing Era S9 Pro cannot. The catch: In side by side tests by Clinch Audio Bass and Mateusz Cholewa, the Xiaomi Sound Party and Soundcore Boom 3i sounded more refined and fuller, and listeners described the C3 Plus’s treble as dull.
Buy the Bogasing Era S9 Pro if sound quality matters more than the price. Buy the Tronsmart Mirtune C3 Plus if the price matters more than sound quality.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A metal grilled two way speaker with very long battery life, aux, microSD and USB-C audio playback, and stereo pairing.
An affordable waterproof speaker with a separate tweeter, app EQ, Auracast linking, stereo pairing and USB-C audio input.
Prices on this page were last checked October 26, 2026 at 11:06 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
| Bogasing Era S9 Pro | Tronsmart Mirtune C3 Plus | |
|---|---|---|
| Price | $85.99 | $49.99 |
| Ranked | #76 of 176 in Medium Size Portable Bluetooth Speakers | #83 of 176 in Medium Size Portable Bluetooth Speakers |
| Amplifier Power | 50W | 50W |
| App | No | Yes (Tronsmart) |
| Aux Input | Yes | No |
| Battery Life | 48 hours (Manufacturer specified) | 12 hours at 50% volume (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | - |
| Digital Aux Input | Yes (USB-C audio) | Yes (USB-C) |
| Dimensions | 4.5”H x 8.9”W x 1.9”D (115 x 226 x 48 mm) | 8.3”H x 3.1”W x 3.3”D (210 x 80 x 85 mm) |
| Drivers | 1x large woofer + 1x silk dome tweeter + 2x passive radiators (front and rear) | 1x racetrack woofer + 1x tweeter |
| EQ | Yes (3 presets: Super Bass, Vocal, 3D) | Yes (app) |
| MicroSD Playback | Yes | - |
| Omnidirectional | No | No |
| Party Mode | No | Yes (Auracast) |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Strap | No | Yes (lanyard) |
| TWS | Yes | Yes |
| Weight | 1.9 lbs (0.88 kg) | 1.8 lbs (0.81 kg) |
| Bluetooth Version | - | 6.0 |
| Charging Time | - | 4 hours |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | - | IPX7 |
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