The Kiwi Ears Orchestra II is a 10-driver balanced armature IEM, an evolution of the Orchestra and Orchestra Lite. It was released in November 2025 and typically retails for 349 USD.
The Nightingale PRO is a planar magnetic single driver IEM featuring a 14.5 mm driver and a wooden faceplate. It launched in late 2025 and the price is typically 295 USD.
When it comes to build and design, they are pretty different. The Orchestra II is quite large and made of clear resin. The Nightingale Pro, while still on the larger side, is a bit smaller and protrudes less from the ear. It is machined out of metal with a zebrawood faceplate. Both earphones come with nice cables and storage/transport cases.
You’ll find my Orchestra II related reviews here, and my Nightingale Pro related reviews here.
SIVGA NIGHTINGALE PRO SPECIFICATIONS
- Style: In-Ear Monitor
- Driver Type: Planar Magnetic
- Driver Size: 14.5mm
- Frequency Response: 20Hz–40kHz
- Impedance: 16 Ohms (±15%)
- Sensitivity: 107dB (±3dB)
- Cable Length: 1.25m (±0.2m)
- Connectors: 0.78 mm 2-pin
- Cable termination: 4.4mm Balanced
- Weight: 14g per side
- Real Leather Case
- Tips 2 types in 3 sizes (6 pairs)
Current price and availability
- Amazon: Sivga Nightingale Pro
- AliExpress: Sivga Nightingale Pro
KIWI EARS ORCHESTRA II SPECIFICATIONS
- Driver Configuration: 10 Custom Balanced Armatures
- 4 x Way Crossover
- Sensitivity: 109dB SPL/mW
- Impedance: 19 Ohms
- Frequency Range
- 20Hz-20KHz
- Cable Connectors: 0.78mm 2 pin
- Cable Length: 122 cm
- Cable Material: single crystal copper, silver-plated (SP-OCC)
- Cable termination: 3.5mm / 4.4mm jacks, interchangeable system
Current price and availability:
- Linsoul: Kiwi Ears Orchestra II
- Amazon: Kiwi Ears Orchestra II
LISTENING COMPARISONS
Associated equipment:
- Amplifier: Topping A90
- DAC: RME ADI-2 DAC FS
Eye of the Day by Marta del Grandi
They’re very similar; both place the vocals in the centre. The Nightingale Pro is a bit smoother and warmer, though. Just a tad.
In the Mountains by Espen Eriksen Trio
Quite similar here as well, but the Orchestra II delivers a punchier and richer bass. Not much, but significant.
The Saint by Berge Özcan
The saxophone has a somewhat warmer, smoother timbre with the Nightingale Pro; the Orchestra II is a tad crisper and brighter. The detail level is very similar.
Re-Melt by Tord Gustavsen Trio
Really nice sounding delivery from the Nightingale Pro, smooth and with nice warmth. Although the bass is modest in quantity, it is not rolled off and is present enough. The Orchestra II is similar, but the bass is more powerful.
Teardrop by Massive Attack
The Orchestra II is rich and snappy sounding, very detailed. The Nightingale Pro has less bass, sounds more open and slightly crisper here, yet still nicely smooth.
The Hidden Camera by Photek
The Nightingale Pro is tight and snappy, yet smooth and delicate. The Orchestra II is very similar but again with more bass quantity, without being bass heavy.
Spontaneous Compositorius by Thomas Agergard
The Orchestra II delivers smooth saxophone; the bright percussion is clean and non-piercing. The Nightingale Pro is similar but, again, with leaner bass.
Vicarious by Tool
Here they are more different. The Nightingale Pro is very nice, smooth and slightly warm, but still with polite bass. The Orchestra II sounds darker in the mids, has more bass and also sounds wider and more spacious than the Nightingale Pro.
Like Suicide by Soundgarden
The Nightingale Pro is impressively tight, the bass is polite but detailed. Great instrument separation, vocals are clean. The Orchestra II has much more bass and feels “boomy” in direct comparison, even though it certainly is not a bassy IEM by absolute standards.
Summer 3 Vivaldi Recomposed by Max Richter
The Orchestra II is excellent. Given the name it should be, as this is an orchestral piece. It sounds darker than the Nightingale Pro here, but I think that is mainly because of the extra bass. Soundstage size and imaging capabilities are very similar.
Young Vivaldi by Modo Antiquo
The string timbre is very similar. Both are excellent.
WRAPPING IT UP
Sound Signature
The Sivga Nightingale Pro and the Kiwi Ears Orchestra II have very similar sound signatures. They are both very neutrally tuned, with the main distinction being that the Orchestra II has more bass – while still not being very bass heavy.
Treble
The treble is very similar. Both have detailed and nicely present highs that are neither recessed nor overly forward. They just sound natural and neutral, as they should.
Midrange
The midrange is very present with both, neutral and naturally delivered. There are some variations from track to track; they are not completely identical, but for all practical purposes they are too similar to conclude on generalized distinctions.
Bass
The bass is where they differ in a significant manner. The Nightingale Pro is a bass-light IEM, typically referred to as “neutral”. The Orchestra II has a more “natural” sounding bass quantity – tuned more towards the Harman curve.
Soundstage and Imaging
The two earphones are very similar in soundstage size and imaging capabilities. Both are excellent. There are some track-by-track variations, depending more on frequency response differences than technical capabilities.
Detail, Dynamics, and Timbre
The detail level is very, very similar. Dynamics are also close, but because the Orchestra II has more bass, on many tracks it can sound more dynamic. However, the Nightingale Pro can, on the other hand, sound more dynamic on some mid-range focused tracks.
The treble and midrange timbre is very good – neutral and natural – and very similar between the two. The Orchestra II has richer, thicker sounding bass than the Nightingale Pro, which is tight and polite.
CONCLUSION
The Kiwi Ears Orchestra II and the Sivga Nightingale Pro are two excellent and very similar sounding IEMs. Based on the difference in driver types, it is actually quite astonishing how similar they sound. They are technically equally capable; soundstage and imaging are very similar. The only significant difference is the amount of bass: the Nightingale Pro is what I’d call “bass-light neutral” , the Orchestra II is “natural-bass neutral”.
When I compare and review two items that sound so similar and have so much in common, I tend to rate my own preference based on which of them I reach for, unconsciously choosing the preferred one. With these two, even my hand cannot decide which to like more.
Both come highly recommended.
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- Linsoul: Kiwi Ears Orchestra II
- Amazon: Kiwi Ears Orchestra II
- Amazon: Sivga Nightingale Pro
- AliExpress: Sivga Nightingale Pro
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