On their own, the Apollo offer a pleasantly engaging and warm sound. Combined with a DAC/headphone amplifier, these open-backed cans fulfil more of their potential.
- Warm, pleasant sound
- Great aesthetics
- Very comfortable
- Amplification gets more performance from them
- UKRRP: £459
- USARRP: $499
- EuropeRRP: €549
- CanadaRRP: CA$709
- AustraliaRRP: AU$809
Planar magnetic driversFeatures 68mm transducers to produce sound
Detachable earpadsEarpads can be detached and replaced
Sendy Audio is the sister brand of Chinese hi-fi outfit Sivga, and they share the ambition of producing high-quality cans that offer an audiophile listening experience.
The Apollo open-backed cans are the first headphones we’ve tested from Sendy, and the expectation is that they’ll follow in the footsteps of the P-II and Robin SV021 models, delivering a warm presentation and aesthetically pleasing looks.
They’re also the most expensive model we’ve looked at from either Sivga and Sendy, which raises those expectations further and poses the question as to whether they’ll be able to meet them. Let’s find out.
- Terrific appearance and construction
- Excellent comfort
- Use goat’s leather in headband
The Apollo are flat-out gorgeous in appearance. Handcrafted at the Sendy factory, the use of rosewood emphasises that natural handmade feel; the glossy finish is a stunner, with no imperfections or nicks on the review sample. The Apollo look great and feel great to touch, and that’s part of the reason that people enjoy hi-fi so.
They’re also lovely to wear. The size of the earcups and padding makes them best suited for bigger heads – smaller ones may feel swamped by their size. The hinges allow some scope for achieving the best fit, but I don’t think you’ll have much trouble there. The earcups simply swaddle your ears in high-protein padding.
At 385g, they weigh less than the P-II, and the earpad cushions that softly press against the head only become a little warm during use. The cans do feel loose at first, but the headband can be adjusted up or down to fit. Speaking of which…
The headband is made from soft and pliable goat’s leather, with any pressure on the head barely noticeable – excellent for extended use; although vegans should probably give these headphones a swerve. Left and right earcups are denoted not just by the markings on the hinges but inside the earpads, too.
The open-back mesh housing features a striking sunlight design, a reference to Greek God of the Sun (and music), Apollo. The dotted membrane has both aesthetic and acoustic purposes, the arrangement of each hole said to influence the tuning of the headphone’s sound. It’s also worth remembering that as an open design, the headphones do leak sound.
Accompanying the headphones is a pear-shaped leather case for storage. It isn’t particularly portable – placed in a rucksack, it’s like a bag within a bag – but it certainly isn’t the biggest carry case I’ve encountered (that would be the one for the Monolith M1070). Inside is a hemp case for carrying the cable and connectors; a 4.4mm balanced effort with 3.5mm adapter. The cable connection on the Apollo is slanted at an angle to avoid draping over the shoulder when in use.
One other aspect to note is that the earpads are detachable and can be replaced should they become damaged.
- Low impendence
- Wide frequency range
- Planar magnetic drivers
The Sendy Apollo don’t come with features in abundance, as you’d find with a wireless equivalent. Rattling through them, impendence is rated at 16-ohms, which is far less than the Sivga P-II or the Grado SR325x on-ears. A figure that low makes them easy to drive but also suggests that amplification is required since without it the volume the headphones will output at is low (unless you nudge the volume up on your source device).
Frequency response is 20Hz to 40kHz, which covers the Hi-Res Audio standard. If you have a) the necessary content and b) a source capable of playing that content, the Apollo should be able to do the rest. Sensitivity is 95dB.
The driver is planar magnetic. In ye olde days when planar technology was first introduced, it was big and heavy, resulting in headphones that were also big and heavy. The technology has advanced to the point where it has become both smaller and lighter, used in wired headphones with ambitions of being as portable as their wireless cousins.
The Apollo sport a 68mm large diaphragm transducer for its planar driver, and Sendy refers to the use of Quad Former technology in its description of the design. It uses two magnets next to a double-coil arrangement either side of the diaphragm in the middle. Sendy claims this offers “excellent” electroacoustic energy efficiency, extremely low distortion, and ups the Apollo’s ability to reproduce music.
The detachable 6N OCC braided cable is 2m in length (another sign these wouldn’t be best for portable use), and Sendy says the cable offers no signal loss in transmission. It also doesn’t become too tangled – and when it does, it’s easy to unpick, which adds a few points in the convenience stakes.
- Warm soundstage with decent width
- Smooth vocal performance
- Not the most dynamic of performers
Having put the Apollo through the recommended 100 hours of burn-in before listening, the low impendence has been a slight cause for concern over the course of using them. I’ve plugged them into portable music players and systems and have always had to push up the volume significantly. If you’re interested in the Apollo, it’s a certainty that you’ll need amplification such as a DAC to get the best from them.
In terms of expectations, the Apollo do meet what Sendy has asked of them. Listening to them reveals a soft-sounding and warm presentation that’s pleasantly lush at times. They are, however, easy-going headphones to a fault.
Plugged into a source, the first thing I had to do was raise the volume – they can sound shy and reticent off the bat. Once a level has been found, the Apollo give up a degree of definition, punchiness and sharpness to a pair like Grado’s SR325x on-ears.
This isn’t a like-for-like comparison, of course – open-backed over-ears vs open-backed on-ears – but listening to the same tracks, the Grados offer more dynamism, greater expression and definition to instruments. On the other hand, the Sendy heaphones’ warmth make bass sound soft, and they’re not as able to pick out instruments with as much clarity and give them their own distinctly etched space within a soundstage.
However, give the Apollo a high-quality track and its attributes come to the fore rather well. A 24-bit/192kHz file of Coldplay’s God Put A Smile Upon Your Face on an Astell & Kern SR25, and the Apoll