The Apollo Pro is a full-size planar magnetic driver headphone from Sendy, Sivga’s higher-end sub-brand. The driver is 78 mm in diameter and uses dual-sided magnets and a diaphragm that is under 800 nanometers thick. The typical price is around 499 USD.
SENDY APOLLO PRO SPECIFICATIONS
- Type: Full size open back
- Driver: Planar magnetic
- Driver size: 78 mm diameter
- Sensitivity: 93 dB ± 3 dB
- Impedance: 27 Ohms ± 15%
- Pads: detachable hybrid with memory foam
- Cable: 2 m OFC
- Cable connectors: dual 3.5 mm mono
- Cable termination: 4.4 mm plug
- Adapters: 4.4 to 3.5 mm SE and 3.5 mm to 6.35 mm
- Leather carrying case
- Hemp bag
- Weight 354 g
Current price and availability:
- Amazon: Sendy Apollo Pro
- AliExpress: Sendy Apollo Pro
- Sendy Audio: Apollo Pro
Disclaimer: The review unit was sent us in exchange for an honest review.
BUILD AND DESIGN
The Apollo Pro is exceptionally well built, as I have come to expect from Sendy and Sivga. It features Zebrawood earcup rings complemented by metal mesh arranged in a distinctive, sunray-inspired pattern.
The headband is the same design found on many other Sendy and Sivga headphones, combining a metal arc with a comfortable suspension strap. It offers excellent swivel movement, while feeling sturdy, refined, and extremely well constructed.
The cable is excellently designed and crafted. It feels robust yet flexible, with just the right amount of friction to prevent it from feeling overly loose or unwieldy. It is a hybrid cable made of 30 strands of 0.05 mm Furukawa OFC, 10 strands of 0.05 mm silver-plated copper, and 10 strands of 0.05 mm enamelled gold-plated copper.
The pads are made from very soft memory foam, with lambskin on the sides and a textile surface where they contact the skin. They are wedge-shaped, with the outer part being wider than the cup rings. This is something Sivga and Sendy use on several of their headphones, and it works very well. It provides more room for the ears than the relatively compact earcups would otherwise allow, making it a nice way to balance comfort and overall size.
LISTENING IMPRESSIONS
Associated equipment:
- DAC/Amp: Ferrum Erco mk2
Stand By Me by Stephen Wilson Jr.
This cover is fantastic. The Apollo Pro sounds well balanced and neutral, not adding or subtracting anything.
In The Mountains by Espen Eriksen Trio
This track can often be a bit too bassy, but not with the Apollo Pro. It all feels well balanced with good detail and nuance. It sounds neutral and correct.
Re-Melt by Tord Gustavsen Trio
Neutral and pleasant.
Teardrop by Massive Attack
Tight bass, snappy percussion. Natural and neutral vocals.
The Hidden Camera by Photek
The percussion on this track can often sound quite dry, and not in a good way, but the Apollo Pro sounds very neutral and pleasant.
Limit to Your Love by James Blake
Vocals are delicate and slightly crisp. The bass is great, with good texture and control. It has a well-balanced, not overdone, presence.
Eye of The Day by Marta del Grandi
Again, the Apollo Pro sounds very well balanced, with nothing dominating more than the rest. Everything sounds like I think it’s meant to sound from the recording. Vocals are natural and nuanced, not very warm, not dry.
Sujet Tabou by Renaudin and Cahours
This percussion and guitar duo sounds dynamic and snappy on the Apollo Pro, and very well balanced. Not dark, not bright, not too warm, not too crisp.
Bullet in the Head by Rage Against the Machine
Tight and snappy, well balanced. Articulate and detailed.
Escape Route by Boris Blank
Nice and organic, well balanced and detailed.
Mahler’s Symphony No. 2 III by Paavo Järvi
Delicate, articulate and well balanced. Good instrument separation and sense of image depth.
Young Vivaldi by Modo Antiquo
Very nice string timbre: delicate and natural but with texture and bite.
WRAPPING IT UP
Sound Signature
The Apollo Pro is very neutral, in the best possible way: it sounds balanced and coherent, and the bass is powerful enough to sound natural and engaging.
Treble
The treble is nicely balanced. It is not overly bright or dark. It is just very neutral and detailed.
Midrange
The midrange is very neutral and detailed. It is not shouty or overly crisp, and it is not overly warm or laid back.
Bass
The bass is very linear sounding. There’s no excessive bloom or annoying bumps, just a nice, well-balanced presence. It sounds very controlled and detailed.
Soundstage and Imaging
The soundstage is reasonably large, and the imaging is good. It’s not giving you a massive out-of-the-head experience like, e.g., the HiFiMan Edition XS or Sennheiser HD800S. It’s good for a headphone in this price class, nothing more.
Detail, Dynamics, and Timbre
The detail level is impressive all across the frequency range. The bass, the midrange, and the treble are all highly detailed and nicely articulated in a refined and slightly smooth way.
Dynamics are strong but not overdone.
The timbre is natural in a neutral way; everything is well-balanced, and nothing stands out more than it should.
COMPARISONS
Associated equipment:
- Amplifier: Topping A90
- DAC: Ferrum Erco mk2
SENDY AIVA 2 vs APOLLO PRO
The Aiva 2 was released in early 2025. It features oval earcups with an oval planar magnetic driver measuring 97 × 76 mm, using double-sided magnets with a 1-micron diaphragm. The typical price is 599 USD.
Comparing the Aiva 2 and the Apollo Pro, I find the Apollo Pro to sound more neutral in general but with a bit more bass presence. The Aiva 2 has a more energetic, upfront midrange and brighter treble. Technical performance is comparable.
Full comparison here:
Aiva 2 vs Apollo Pro Comparison Review
– Amazon: Aiva 2
SENNHEISER HD660S2 vs APOLLO PRO
The Sennheiser HD 660S2 is an open-back dynamic driver headphone released in 2023, building upon the HD 600 and HD 650. They all feature variations of a 38 mm, 300-ohm dynamic driver. The current price for the HD 660S2 is typically the same as for the Apollo Pro, around 499 USD.
Comparing the HD 660S2 and the Apollo Pro, the HD 660S2 has warmer mids, along with more midbass but less subbass. The Apollo Pro sounds more neutral and offers better detail retrieval and imaging.
Full comparison here:
Sennheiser HD660S2 vs Apollo Pro Comparison Review
– Amazon: Sennheiser store
AUDEZE LCD-2 Classic vs APOLLO PRO
The Audeze LCD-2 Classic is often referred to as the “LCD-2C.” It was originally released in 2018. It’s a large and heavy planar magnetic headphone with impressive build quality, typically priced around 799 USD.
Comparing the LCD-2C and the Apollo Pro, they’re quite similar. The LCD-2C has slightly brighter mids; the Apollo Pro sounds generally more neutral and often a tad more refined.
Full comparison here:
Audeze LCD-2 Classic vs Apollo Pro Comparison Review
– Amazon: LCD-2 Classic
CONCLUSION
I am really impressed with the Apollo Pro. It has a neutral and natural sound signature, with a refined and highly detailed presentation. The build quality is outstanding, and the comfort level is excellent. Honestly, there is not much more you could ask for from a headphone in this price class.
I can highly recommend the Apollo Pro. Well done, Sendy Audio!
Thanks for reading. You can support us by purchasing anything using any of our affiliate links.
- Amazon: Sendy Apollo Pro
- AliExpress: Sendy Apollo Pro
- Sendy Audio: Apollo Pro
Any purchase you make on Amazon, Linsoul , AliExpress or Audio46 with any of our affiliate links will give us a small provision at no cost to you.
We only get a provision for items that are not returned, so there’s no incentive for us to recommend something that’s not good.
Linsoul : Headphones, Earbuds, Wireless Earbuds, Desktop DAC/AMP, Portable DAC/AMP, Digital Audio Players,
Amazon: Headphones, IEMs, Headphone Amplifiers, Home Audio or Anything else.
.
If you enjoyed this article or other content on The Headphoneer, you might consider leaving a small donation to keep this website up and running. No donation is too small. Thanks for supporting us!
If you like our work please follow us on Instagram, Facebook and Twitter , it will help us grow. Sharing is caring 🙂
