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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a single pair of earbuds that does the heavy lifting on its own — adaptive noise cancelling, LDAC hi-res audio, multipoint, a long-play battery case — choose QCY MeloBuds Pro Aadptive; if you need to turn a USB-C device into a Bluetooth audio hub that can broadcast aptX HD and Auracast to many receivers at once, choose SUNITEC Auracast Transmitter USB-C.
• QCY MeloBuds Pro Aadptive — biggest strength: adaptive hybrid ANC rated to cut noise by up to 46dB, a 12mm bio-diaphragm driver with LDAC Hi-Res support, and up to 34 hours of total playtime with the case.
• QCY MeloBuds Pro Aadptive — biggest trade-off: LDAC needs an Android phone and has to be switched on in the app, and turning LDAC on disables dual-device multipoint while it's active.
• SUNITEC Auracast Transmitter USB-C — biggest strength: it adds aptX HD, aptX Adaptive and LC3/Auracast broadcasting to any USB-C device, and can push audio to virtually unlimited Auracast receivers with a 164ft broadcast range.
• SUNITEC Auracast Transmitter USB-C — biggest trade-off: it's a playback-only dongle — no microphone input or voice chat through it — and Auracast mode only works with Auracast or LE Audio receiving gear.
• Buy QCY MeloBuds Pro Aadptive if you're shopping for the earbuds themselves and want ANC plus hi-res wireless audio on Android.
• Buy SUNITEC Auracast Transmitter USB-C if you already own headphones, speakers or hearing aids and want to get aptX HD or Auracast out of a phone, PC, Mac, tablet or PS5.
The MeloBuds Pro is a do-everything set of in-ear buds. The headline is adaptive ANC that reads your surroundings and applies up to 46dB of reduction, with four selectable noise-cancelling modes so you can match the setting to a plane, a train or a noisy office. Sound is handled by a 12mm dynamic bio-diaphragm driver covering 20Hz–20,000Hz, and it supports LDAC and Hi-Res Audio — QCY claims LDAC carries roughly 3x more data than standard Bluetooth audio. There's also a spatial audio algorithm for a wider, more directional stage.
Buy it if you're an Android user who wants one pair of buds for commuting, calls and gaming, and you value the app EQ and multipoint. Skip it if you're on iPhone (LDAC won't apply), or if you want to broadcast audio to several listeners — these are a personal listening product, not a transmitter.
SUNITEC Auracast Transmitter USB-C: Who It's For
The SUNITEC BT400T is a completely different animal: a tiny 2.8g USB-C dongle that adds Bluetooth audio transmission to devices that don't have it, or upgrades what they can send. It supports AAC, SBC, aptX, aptX Adaptive and aptX HD over Classic Bluetooth, plus LC3 in Auracast mode. A single button flips between Classic Bluetooth (pair one headset for private listening, up to 33ft) and Auracast Broadcast Mode (up to 164ft, one-to-many).
That broadcast mode is the real story. It can push audio to virtually unlimited Auracast-compatible headphones, speakers and hearing aids at once — useful for classrooms, conferences, gyms, museums, family TV watching or assistive listening. A second button switches sampling rates: 24kHz (orange LED) for hearing aids and all headsets, 48kHz (green LED) for headphones and speakers. Compatible receivers discover and join the broadcast with no pairing.
Setup is genuinely plug-and-play — no drivers or apps — across iPhone 15/16/17, Android phones, tablets, iPad, laptops, desktops and PS5. Two caveats matter: it's audio playback only, with no mic input or voice chat through the dongle (on PS5 you'd use the controller mic), and Auracast mode requires Auracast or LE Audio receivers. The dongle itself has no battery and no plug — it draws power from the USB-C port.
Buy it if you already own good headphones or speakers and want wireless audio from a device that lacks it, or you need to share one audio stream with many listeners. Skip it if you need a microphone path, or your headphones aren't Auracast/LE Audio compatible and you only care about one-to-one listening you can already do.
Side-by-Side: Which Should You Choose?
• Best for personal hi-res listening on Android → QCY MeloBuds Pro Aadptive. LDAC and a 12mm driver, no extra hardware needed.
• Best for noise cancelling → QCY MeloBuds Pro Aadptive. Up to 46dB adaptive ANC with four modes.
• Best for battery life → QCY MeloBuds Pro Aadptive. 7.5 hours per charge, up to 34 hours with the case, 10-minute quick charge.
• Best for gaming and low latency → either, depending on setup. QCY quotes 80ms latency in the buds; SUNITEC targets PS5/PC with aptX Adaptive for sync-friendly audio.
• Best for sharing audio with several people → SUNITEC Auracast Transmitter USB-C. One-to-many broadcast, no pairing required for compatible receivers.
• Best for hearing-aid users → SUNITEC Auracast Transmitter USB-C. The 24kHz mode is designed for compatible Auracast hearing aids.
• Best for a no-hassle single purchase → QCY MeloBuds Pro Aadptive. Everything you need is in the box; no dependency on what you already own.
In my opinion, these aren't really competitors — they solve different problems, so the "right" pick depends entirely on what you're missing. If you need earbuds and want aptX-family sound, I'd get the SUNITEC Auracast Transmitter USB-C only if you already own aptX HD headphones and a USB-C source; otherwise it does nothing for you. For most people shopping for the buds themselves, I'd buy the QCY MeloBuds Pro Aadptive — ANC, LDAC, multipoint and 34-hour battery make it the more complete standalone product. Check the current price on Amazon for whichever fits your setup.
FAQ
which earbuds support aptx hd
Look for earbuds whose spec sheet lists aptX HD directly — in this comparison, neither product is a pair of aptX HD earbuds. The QCY MeloBuds Pro Aadptive uses LDAC and Hi-Res Audio (Android only), while the SUNITEC Auracast Transmitter USB-C transmits aptX HD and aptX Adaptive to earbuds that support those codecs. So the transmitter is the aptX HD half; your earbuds must already handle it.
Yes for the extras. The QCY app handles EQ customisation and firmware updates, and it's where you activate LDAC — QCY notes LDAC only works with Android devices. The buds also work as normal Bluetooth earbuds without the app, including touch controls and in-ear detection, but you lose the tuning and the LDAC switch.
In Classic Bluetooth mode it pairs one headset like a standard Bluetooth transmitter, with AAC, SBC, aptX, aptX Adaptive and aptX HD available. In Auracast Broadcast Mode it only works with Auracast or LE Audio receiving devices. It's also playback-only — no microphone or voice chat passes through the dongle, so keep that in mind for calls.
Yes, but only with the SUNITEC Auracast Transmitter USB-C. In Auracast Broadcast Mode it can send audio to virtually unlimited compatible Auracast headphones, speakers and hearing aids at once, with up to a 164ft range, and compatible receivers join without pairing. The QCY MeloBuds Pro Aadptive is a personal listening product and can't broadcast.
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See also: QCY MeloBuds Pro Aadptive vs GOWENIC Earbuds, LilGadgets Connect+ Pro vs ASKUBSKU USB C Headphones, JVC ORANGE GUMY vs ZOOAUX PRO USB C