Search for “Aune AC45” and you may land expecting a USB dongle DAC, since Aune’s Yuki line has made the brand a familiar name in that category. The AC45 is something completely different: an open-back, clip-on (ear-hook style) dynamic headphone, closer in form factor to a running headphone or an old-school clip-on than to anything with a DAC chip inside. Worth clearing up immediately, since the naming overlap trips up plenty of people doing a quick search before buying.
Not a Dongle, a Headphone
To be direct about the form factor: the AC45 clips over the ear rather than sitting fully on or in it, in the tradition of open clip-on headphones that have quietly stuck around as a niche category for decades. It is a genuine open-back dynamic headphone, meaning sound leaks in and out freely, there is no isolation from outside noise, and the sound signature benefits from that open design the same way full-size open-back headphones do.
This matters for expectations. If you want a sealed, noise-isolating pair of headphones or IEMs for a commute, the AC45’s open-back, clip-on design is the wrong tool. If you want a lightweight, comfortable option for desk use or quiet home listening where isolation is not the priority, it starts to make a lot more sense.
Driver and Specifications
- Driver: 40mm dynamic, W-shaped bio-fiber composite diaphragm
- Vibration area: roughly 70% larger than a typical clip-on headphone driver
- Impedance: 18 ohms
- Sensitivity: approximately 112dB
- Frequency response: 15Hz to 40kHz (claimed)
- Cable: detachable, CIEM-style 0.78mm connectors, with swappable 3.5mm single-ended and 4.4mm balanced termination options
- Weight: approximately 35 grams per earpiece
The 18-ohm impedance is worth calling out specifically, because it is notably easier to drive than a lot of full-size open-back headphones. That has real practical consequences for what you can pair it with.
Comfort and Wearability
At roughly 35 grams per side, weight is not a concern even for long sessions, and the clip-on ear-hook design distributes that weight differently than an over-ear headphone’s headband, which some people find more comfortable for hours at a desk and others find takes an adjustment period compared to a traditional over-ear clamp. There is no true seal against the ear, so passive noise isolation is essentially zero; this is squarely a quiet-room or desk headphone rather than a travel companion.
Cable and Termination Flexibility
The detachable 0.78mm CIEM-style cable is a smart touch on a headphone at this price point. It means:
- A worn-out or damaged cable can be replaced without retiring the whole headphone.
- Swapping between a 3.5mm single-ended termination and a 4.4mm balanced termination is straightforward, so the AC45 can move between a phone, a dongle DAC, and a full desktop balanced amplifier without needing an adapter chain.
- Aftermarket 0.78mm cables from the wider IEM cable market are compatible, opening up tuning and ergonomic options beyond the stock cable.
Sound and Setup Tips
Because of the low 18-ohm impedance and reasonably high sensitivity, the AC45 is genuinely easy to drive from a phone’s dongle, a laptop’s headphone jack, or a basic portable DAC/amp; it does not demand a powerful desktop amplifier to sound its best, which is a point in its favor for anyone who wants a grab-and-go open headphone rather than a full desktop rig. That said, feeding it from a cleaner source, such as Aune’s own Yuki dongle line or a modest desktop DAC, does bring out more detail and a blacker background than a stock phone output.
The open-back design and W-shaped composite diaphragm combine to give a spacious, airy presentation with an extended top end, consistent with the very wide claimed frequency response. Bass on a clip-on driver of this size will not match a large closed-back over-ear, but the tuning avoids feeling thin, and the overall balance leans toward a natural, non-fatiguing signature suited to long listening sessions rather than a bass-forward or heavily colored sound.
Practical Setup Notes
A few things worth knowing before wearing the AC45 for the first time:
- Take a minute to adjust the ear-hook angle rather than forcing it on the first try; the clip-on style relies on finding the right hook position for your ear shape, and a small adjustment makes a bigger comfort difference than it sounds like it should.
- Because the diaphragm is open-back, do not expect any meaningful noise blocking even at higher volumes; it is designed for quiet rooms, not shared or noisy spaces.
- If picking up the balanced 4.4mm termination option, confirm your source actually supports 4.4mm balanced output before ordering that version over the 3.5mm single-ended cable, since swapping terminations after the fact means sourcing a separate 0.78mm cable.
- Store the earpieces somewhere they will not get crushed when not in use. The open grille housing is more exposed than a sealed earcup, and the exposed driver mesh is the most vulnerable part of the design.
Value for Money
Positioned as an accessible open-back option rather than a flagship, the AC45’s real value proposition is the combination of a genuinely open, spacious sound with a driving-friendly 18-ohm impedance and a detachable, upgradeable cable system. Competing open-back headphones in a similar bracket often force a choice between comfort, sound, and cable flexibility; the AC45 does not ask for that compromise, even if it does ask you to accept the tradeoffs of the clip-on format itself, namely zero isolation and a wearing style that will not suit everyone.
Who It’s For
- Desk or home listeners who want an open, airy sound without committing to a full-size headphone and stand
- Anyone who values low driving requirements and wants something that works straight out of a phone or basic dongle
- Listeners who want cable and termination flexibility on a budget-friendly open-back option
It is not the right pick for commuting, noisy environments, or anyone expecting DAC functionality from the “AC” naming; Aune’s Yuki series covers that separate use case with actual dongle DACs, sold through Aune’s official store.
FAQ
Is the Aune AC45 a dongle DAC?
No. It is an open-back, clip-on dynamic headphone. Aune’s Yuki line covers dongle DACs separately.
Does the AC45 isolate outside noise?
No, it is open-back with no seal against the ear, so it lets ambient sound in and out freely by design.
Can the cable be replaced?
Yes, it uses a detachable 0.78mm CIEM-style connector, and swappable terminations (3.5mm and 4.4mm) are supported.
Is it hard to drive?
No, at 18 ohms impedance and around 112dB sensitivity, it is easy to drive from phones, dongles, and basic amplifiers.
How does it compare to the AC55?
The AC55 is the newer, higher-tier model in the same clip-on line, with a higher 32-ohm impedance and an upgraded driver design; see our separate comparison for the full breakdown.
I have worn my share of open-back headphones and clip-on designs over the years covering portable audio gear, and the AC45’s combination of low weight and easy drivability makes it one of the more approachable open headphones I have tested recently.