Compare Sendy Audio Apollo Pro vs Grado Signature S750

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.

The package is sparse for the asking price. Reviewers specifically criticized the lack of a case and the absence of multiple cable choices in the box.

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.

Clamp is inconsistent across head shapes rather than universally comfortable. One reviewer found it overzealous and tiring, another described the design as firm, while another thought the fit was too loose.

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

The familiar friction-rod headband adjustment works effectively, but its presentation divides opinion. One reviewer preferred its simple function to ornate mechanisms, while another thought it felt crude for the price.

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

Detachable mini-XLR cabling is widely treated as a major Grado improvement. Swappable lengths and balanced terminations make the S750 far easier to adapt to different amplifiers and listening positions.

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 new B cushions improve comfort for some listeners but are strongly fit-dependent. They can distribute pressure well, yet the flat on-ear foam felt poorly fitting or uncomfortable to others.

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.

Long-session comfort is the biggest point of disagreement. Some listeners wore the S750 for hours comfortably, while others found the on-ear pressure, foam, weight, or fit tiring within a short period.

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.

At about 460 g, the S750 is lighter than some Signature siblings but still feels heavy to several reviewers. The reduced mass helps versus larger models, yet weight can undermine stability and long-session comfort.

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

The Signature Gold cable is lighter and softer than older Grado designs, but cable ergonomics remain divisive. Critics still found it heavy, stiff, or awkwardly sized for common listening setups.

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.

Value depends on what you prioritize: $1,695 is repeatedly called expensive, yet several reviewers think the sonic performance competes above its price class. Buyers paying for comfort, accessories, or luxury finish may find the equation less convincing.

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

The aluminum construction can feel appropriately premium, but luxury impressions are not unanimous. One reviewer thought the materials justified the positioning, while another said the pads and headband did not feel luxurious at all.

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.

The stock B cushions are not the only fit option. Compatibility with Grado G, F, and L cushions gives owners a practical route to change how the S750 sits on the head.

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

Extra headband padding is generally seen as a meaningful improvement over older Grados. Most reports are positive, but one reviewer still found the padding meager and insufficient for the price.

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.

Recommendations are strong for dedicated audiophile use, especially for listeners who prize detail, openness, and spatial precision. Fit, source matching, and price make an audition advisable before buying.

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 leakage is an unavoidable downside of the open-back design and is serious enough to rule out many shared or public spaces. Quiet private listening is the intended environment.

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.

Overall satisfaction is high because the S750 repeatedly delivers memorable, engaging sound. The strongest reservations center on physical comfort and premium-price ergonomics rather than the core audio performance.

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

The open-back construction offers little practical isolation from noisy surroundings. It is better suited to quiet home listening than portable use in busy environments.

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.

Practical portability is poor despite the detachable cable. Open-back leakage, weight, and the lack of suitability for noisy environments keep the S750 focused on stationary listening.

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.

Reviewers who focused on tonal accuracy heard a lifelike, uncolored, and convincing balance with precise timbre. The S750 favors faithful presentation over added warmth or bass emphasis.

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.

Midrange performance is a standout across the board, with vocals described as vivid, tangible, crisp, and highly intelligible. Acoustic instruments also benefit from strong presence and clean articulation.

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

Complex mixes stay exceptionally easy to untangle, with instruments and voices given clear space and localization. Dense orchestral, jazz, and rock passages remain layered rather than collapsing together.

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

With the right source, the S750 can sound deeply immersive as well as analytical. Its vivid vocals, speed, and spacious presentation can make well-recorded music feel immediate and involving.

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.

A broad, open soundstage is one of the S750’s defining strengths, often described as huge, airy, lifelike, or extending well beyond the earcups. One reviewer found the stage less expansive, but still accurate and breathable.

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.

The S750 is not uniformly source-agnostic: several reviewers heard clear gains with capable amplification, while one pairing lost clarity and openness. Good amplification can unlock more resolution, but system matching matters.

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.

Mini-XLR connections and optional cable lengths or balanced terminations give the S750 unusually flexible wired connectivity. Reviewers liked being able to tailor the cable setup to different sources and room layouts.

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 industrial Grado look remains distinctive, with several reviewers praising its retro, minimalist, or elegant execution. A dissenting view felt the physical appearance did not match the premium price.

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

The S750 keeps Grado’s recognizable identity while cleaning up the presentation into a more modern, minimalist profile. The look is distinctive without becoming ornate.

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.

These are poor travel headphones: the open-back leakage, substantial weight, and insecure movement reported by some listeners work against commuting. Their strengths are much better suited to stationary home listening.

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.

The S750 is consistently praised for exceptionally revealing, natural sound with strong musical engagement. Even the more critical takes on fit and hardware still describe the listening performance as a major strength.

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

The limited 105-degree cup rotation is presented as a sensible durability choice, preserving useful flexibility while reducing wear. It favors controlled movement rather than full swivel freedom.

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.

Treble is detailed, airy, and extended, but opinions depend on tolerance for brightness. Several reviewers found it controlled and clean, while others warned that hot recordings or louder listening can make the upper range harsh.

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.

Bass is generally tight, articulate, and well controlled rather than boosted for impact. Most reviewers call it lean or restrained for bass-heavy music, though one heard unusually deep, powerful sub-bass when the recording demanded it.

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.

Build quality is usually a strength, thanks to aluminum construction, solid hardware, and careful finishing. Most reviewers describe it as rugged or beautifully built, although one felt some headband details looked and felt cheaper than expected.

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.

One publication gave the S750 a Product of the Year Award before its full review, reflecting unusually strong enthusiasm for its sonic performance. That recognition reinforces how highly its sound was regarded there.

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.

Fine detail retrieval is one of the most consistent strengths, revealing low-level textures, room cues, vocal nuances, and layers in familiar recordings. The presentation is highly informative without always becoming clinical.

The restrained swivel range and reinforced metal hardware are designed to reduce wear over time. Reviewers discussing the assembly viewed it as rugged and well suited to regular use.

The S750 handles both large dynamic swings and subtle microdynamics with unusual speed and control. Rhythm, transient attacks, and changing intensity stay composed even in dense music.

The S750 responds well to external EQ, with one reviewer adding low-end weight through Roon without damaging speed or articulation. That makes subtle tonal correction more viable than on some earlier Grados.

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.

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

Imaging is exceptionally precise, with stable placement and clear localization across the stage. Reviewers repeatedly describe instruments and voices as easy to position in a convincing three-dimensional space.

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.

High-volume behavior is mixed: some listeners heard clean, glare-free treble at significant levels, while another found the brightness increasingly harsh as volume rose. The result appears especially dependent on recording quality and treble sensitivity.

Owners can swap the stock B cushions for other compatible Grado pad shapes to change fit. That flexibility is useful for listeners who do not get along with the default on-ear geometry.

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

Stability depends heavily on fit and movement. The reinforced hardware is described as secure, but one wearer found the headphones would not stay put while moving their head at a desk.

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.

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.

The raw foam pads can hold noticeable body heat. That may become uncomfortable during warmer or more active use, even though the headphone is primarily intended for stationary listening.