Compare DALI IO-12 Headphones vs Sendy Audio Apollo Pro

A passive 3.5mm option was treated as a useful fallback that keeps music available when power runs out.

A 3.5mm adapter is included, so standard laptop and portable connections are possible. The long adapted plug is awkward, and a dedicated 3.5mm cable would be cleaner.

ANC was generally considered useful and capable with low rumbles, but multiple reviewers stressed it is not the product’s standout or class-leading feature.

Advanced software extras were limited, with reviewers pointing to a bare feature set and lack of app-driven controls.

Looks were divisive: some reviewers liked the smart brown finish, while others found the size and profile awkward or attention-grabbing.

Despite its large planar cups, the frame looks relatively low-profile and cohesive. The design is distinctive without relying on oversized branding.

The Apollo Pro can play from modest sources, but stronger amplification brings firmer dynamics and fuller performance. One listener found it easy to drive, while another preferred a more powerful balanced setup.

Background noise reduction was effective for ambient rumble and daily distractions, though not described as total isolation.

One reviewer strongly praised that ANC did not alter the headphone’s sound signature.

Review evidence says ANC can be used without taking a noticeable hit to audio quality.

The missing app split reviewers: some saw it as a drawback for settings and EQ, while others appreciated the simplicity.

Bass was widely praised for control, punch, weight, and optional added thump without becoming broadly bloated.

Bass reaches deep with good texture and control, but physical slam is more restrained than bass-heavy dynamic headphones. The tuning favors warmth and definition over subwoofer-like impact.

Battery life was viewed as acceptable to good, with 35 hours often described as sufficient but not exceptional at the price.

Bluetooth performance was praised for fast pairing, stable connection, and strong wireless sound, though one reviewer noted wireless loses detail versus wired.

Build quality was consistently praised as premium, sturdy, and well executed.

Build quality is repeatedly praised for solid metalwork, clean fitting, and reassuring adjustment hardware. Nothing feels loose or unfinished, and the construction competes well above its price.

The onboard DAC/amp and active electronics were presented as important to unlocking the headphone’s best performance.

Physical controls were mostly praised for responsiveness and usability, with some complaints about accidental presses.

Cable feedback was mixed: one reviewer criticized a cable as janky, while another liked the woven branded cables.

The stock braided cable feels premium, durable, and low in handling noise. Its weight and unusual connector arrangement are the main practical drawbacks.

The carry case was praised as sturdy, protective, and luxurious, though other evidence notes it contributes to travel bulk.

The leather case is sturdy, protective, and notably nicer than typical included cases. It makes storage safer even though the headphone itself is not ideal for travel.

Left and right channels track closely, supporting a stable center image and accurate positioning. No meaningful imbalance was reported.

Charging drew mixed feedback because there is no fast-charge mode, but one reviewer liked the long-term battery-protection behavior.

Clamping force was generally praised as secure without becoming overly pressuring or unstable.

Clamp is secure enough to keep the cups stable without pressing hard around the jaw. It should suit long listening sessions better than many heavier planars.

Codec support was framed as helpful for minimizing the compromises of wireless listening.

Comfort was one of the strongest points, with several reviewers calling the IO-12 among the most comfortable over-ear headphones they had worn.

Comfort is a standout strength, with several listeners able to wear it through multiple albums or all day. The fit stays secure without creating obvious pressure points.

Connectivity was a strength, with reviewers valuing the wired, wireless, USB-C, and passive listening flexibility.

The balanced cable and included 3.5mm and 6.35mm adapters cover many portable and desktop sources. The adapter stack can become bulky, but compatibility is broad out of the box.

Design feedback was mostly positive for elegance and distinctiveness, though the brown finish and large form factor were subjective.

Zebrawood cups, exposed metal, and the sunburst grille give the Apollo Pro a distinctive premium look. The styling earns strong praise, though its decorative appearance will not suit every taste.

The detachable cable can be replaced if it fails, which supports longer ownership. However, the single-ring right-side connector limits compatible aftermarket choices.

Durability evidence was limited but positive, with one reviewer reporting the headphones held up through repeated travel.

Ear cup padding was repeatedly praised as plush, soft, leather-covered, and comfortable.

The deep velvet pads are soft, breathable, and unusually comfortable. Their cushioning spreads pressure well and reduces heat compared with many synthetic-leather pads.

The yokes and cups articulate smoothly in multiple directions. That movement helps the pads conform to different head shapes without constant repositioning.

EQ customization was a weak point because reviewers noted the absence of app-based EQ or deeper profile control.

Feature depth was mixed to weak: reviewers liked the core experience but noted limited software support and app features.

Frequency balance was praised as cohesive, polished, even, and well controlled across the range.

The response is controlled and broadly balanced, with no exaggerated bass shelf or sharp showroom-style treble boost. Its warmer lower midrange keeps it from being strictly neutral.

Wide staging and precise directional placement make footsteps and effects easy to locate. It works especially well for immersive single-player gaming, though voice chat needs a separate microphone.

Glasses did not meaningfully break the seal or reduce bass response in testing. The soft pads adapt well around frames while staying comfortable.

Headband adjustment was praised in one review for smooth movement and secure positioning.

The suspension headband offers a broad, easy adjustment range that helps the cups settle quickly. Finding a comfortable fit requires little effort.

Headband padding had a mild comfort caveat, with one reviewer saying the thin band was uncomfortable at first.

The broad, softly padded headband spreads weight effectively and avoids a concentrated crown hotspot. It supports the headphone’s excellent long-session comfort.

The adjustment hardware feels firm, holds its position, and does not creak. The moving parts give a reassuring impression of careful tolerances.

Immersion was a clear strength, with reviewers describing the soundstage and presentation as multidimensional, open, and engaging.

Films and spacious recordings benefit from broad imaging, stable placement, and clear layering. The presentation can feel more speaker-like than many conventional headphones.

Accessories were generally useful, but one reviewer missed a USB-C to USB-C cable.

The package is generous, with a leather case, accessory pouch, balanced cable, and multiple adapters. The selection feels complete, although the adapter arrangement is not especially elegant.

Instrument separation was a standout strength, repeatedly described as outstanding, accurate, layered, and clearly spaced.

Dense arrangements remain organized, with individual instruments easy to distinguish without sounding artificially disconnected. Fast passages and layered mixes are handled especially well.

There is no built-in microphone, so online gaming and calls require a separate mic. That omission matters mainly for users seeking an all-in-one gaming headset.

Maximum-volume behavior was praised for headroom, detail, and lack of distortion.

Midrange clarity was repeatedly praised for resolution, clean layering, vocal realism, and detail.

Voices and instruments sound full, natural, and easy to follow. The slightly warm presentation adds body without making the midrange thin, brittle, or overly forward.

Passive isolation benefited from the large earcups and fit, helping reduce outside noise before ANC.

Passive isolation is minimal, as expected from an open-back headphone. Outside sounds remain audible, so it works best in a quiet private room.

Overall recommendations were positive for listeners prioritizing premium wireless sound, with caveats around price, travel bulk, and features.

The Apollo Pro earns strong recommendations for home listeners who prioritize comfort, spaciousness, and a warm but detailed sound. It is less suitable for commuters, bass-heads, or treble-sensitive buyers.

Long-term impressions are strongly positive, with listeners enjoying the Apollo Pro across music, films, and gaming. Warmth, comfort, and spaciousness drive most of that enthusiasm.

Portability was a consistent weakness because the headphones are large, do not collapse, and use a bulky case.

This is a desk-focused headphone rather than a portable one. The large open cups, substantial cable, and limited privacy make travel inconvenient despite the included case.

Premium feel was consistently supported by high-end build, leather materials, accents, and a luxury presentation.

The zebrawood, aluminum frame, leather details, and careful finishing create a convincingly premium impression. It looks and feels appropriate for its price class.

The preset Hi-Fi and Bass modes were generally praised, especially the controlled bass boost and audiophile-leaning Hi-Fi mode.

Replaceable earpads were praised as a welcome feature for cleaning and replacement.

The pads can be removed and replaced without much difficulty. Replacement availability should be checked before purchase, but the design is more serviceable than permanently fixed pads.

Pad replacement received positive support, though the evidence focuses on replaceable earpads rather than the headband.

The glossy zebrawood finish can show skin oils, small marks, and surface wear. Regular wiping and careful storage will help preserve its appearance.

Setup simplicity was a strength for reviewers who valued fast pairing and freedom from app tinkering.

Sound leakage is substantial, and people nearby may hear much of the music. Shared offices, commuting, and late-night use beside another person are poor fits.

Sound quality was the product’s strongest consensus, with reviewers repeatedly calling it outstanding for wireless headphones.

The overall sound is consistently described as natural, detailed, and enjoyable, with warmth that avoids muddiness. It stays musical rather than clinical, even when presenting plenty of information.

Soundstage was praised as wide, open, spacious, and unusually impressive for Bluetooth closed-back headphones.

The open-back presentation creates a broad, stable stage with convincing depth and placement. Most listeners praise its spaciousness, though one found it less expansive than the widest open-back alternatives.

Connection and fit stability evidence was positive, with reviewers reporting no dropouts and stable long listening.

A detachable cable and replaceable pads improve serviceability and reduce the need to discard the whole headphone after wear. Buyers should still confirm long-term replacement-part availability.

Transparency mode was considered clear and useful for outside awareness without major disruption.

Travel friendliness was mixed: sound-on-the-go was valued, but size and packing difficulty were recurring caveats.

Open-back leakage and almost no isolation make the Apollo Pro a poor travel companion. It is better suited to a desk, listening chair, or quiet home room.

Treble was generally praised for detail and smoothness, though some brightness sensitivity appeared in one review.

Treble is detailed and airy without becoming consistently harsh, making long sessions easier. Some listeners may still find the upper range a little spicy on bright recordings.

USB-C playback received positive support as part of the IO-12’s high-quality wired digital listening flexibility.

Value was highly context-dependent: some reviewers found it worth the premium, while others questioned the price.

The build, comfort, accessories, and sound make the $449 price competitive. It is not a bargain for everyone, but several listeners consider the package excellent for the money.

Voice prompts were useful for battery feedback, especially warning users about charge status before it becomes a problem.

Volume output had positive support, with enough headroom and strong clarity at high volume.

The Apollo Pro reaches practical listening levels from many dongles and portable sources. A cleaner or more powerful amplifier can still improve dynamics and bass control.

Weight comfort was positive in one review, where the headphones never felt cumbersome despite their size.

Although the cups look large, the 354-gram frame feels lighter than expected. Good distribution keeps the headphone from dragging downward or creating a narrow hotspot.

Wind noise handling was a weakness, with one reviewer finding the IO-12 more susceptible than consumer-focused rivals.