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Description
HiBy R6Pro II 2025 – Dual CS4308P DAC Hi-Res Lossless Portable Music Player
The HiBy R6Pro II 2025 is the next evolution of HiBy’s acclaimed portable digital audio player (DAP), designed for discerning audiophiles who seek uncompromising fidelity, raw power, and modern versatility. With dual Cirrus Logic CS4308P flagship DACs, switchable Class A/AB amplification, and a 632mW balanced output, this player sets a new standard for Hi-Res portable music players in 2025.
Dual CS4308P DACs – A World’s First in Portable HiFi
The R6Pro II 2025 debuts the industry’s first dual-chip CS4308P DAC architecture, running twin DACs in parallel for superior sound density, imaging, and micro-detail. Capable of 32-bit/768kHz PCM, DSD512, and MQA 16× decoding, it achieves:
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123dB dynamic range
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Ultra-low THD+N (-115dB)
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A sound signature that is rich, natural, and layered
The result: a lifelike listening experience with breathtaking resolution and holographic soundstage.
Class A / AB Amplification – Two Amps in One
HiBy equips the R6Pro II 2025 with dual independent amplifier circuits:
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Class A Mode → Ultra-linear, distortion-free power for demanding full-size headphones and multi-driver IEMs.
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Class AB Mode → Efficient, cooler operation for daily listening with extended battery life.
With one-touch switching, you can tailor the output to your headphones and preferences.
Flagship-Level Output Power
The 632mW @ 32Ω (4.4mm balanced) output makes this DAP powerful enough to rival desktop amps, delivering:
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Faster transients
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Deeper bass impact
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Wider dynamic swings
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Effortless drive for high-impedance headphones
Compared to the previous R6Pro II, the 2025 model doubles down on power and refinement, ensuring every track feels more alive and immersive.
Smooth, Musical, Fatigue-Free Tuning
Specially tuned for mid-low frequency richness, the R6Pro II 2025 emphasizes:
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Warm, natural mids
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Smooth treble with no harshness
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Velvety texture in vocals and instruments
This makes it perfect for long listening sessions, balancing reference-grade detail with enjoyable musicality.
Premium Hardware & Design
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Qualcomm Snapdragon 665 SoC (11nm) for fluid multitasking
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6GB RAM + 128GB internal storage, expandable via microSD up to 2TB
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HiByOS (Android 12) with true bit-perfect playback for streaming & offline apps
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5.9″ IPS Full HD+ (2160×1080) display with Corning Gorilla Glass
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Artistic aluminum + glass chassis with futuristic abstract back panel
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HiByCast remote control for wireless operation via smartphone/tablet
Connectivity & Versatility
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Outputs: 3.5mm PO, 4.4mm BAL, Line-Out, Coaxial Digital, USB-C (Audio Out/SPDIF)
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Inputs: USB DAC (PC/phone), Bluetooth DAC
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Wireless: Dual-band Wi-Fi + Bluetooth 5.0 with UAT, LDAC, aptX HD, aptX, AAC, SBC
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Battery: 5000mAh, PD 18W fast-charging (<2h full charge)
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Playback Time: Up to 12h (Class AB) / 5.5h (Class A)
The R6Pro II 2025 can function as a standalone DAP, a high-quality Bluetooth receiver, or a digital transport in your home audio chain.
HiBy R6Pro II (2025) vs HiBy R6Pro II – What’s New?
The 2025 edition brings significant improvements across the board:
| Feature | R6Pro II | R6Pro II (2025) |
|---|---|---|
| Output Power (3.5mm) | 125mW | 165mW |
| Output Power (4.4mm) | 383mW | 632mW |
| SNR | 117–122dB | 121–125dB |
| THD+N | 0.0005–0.0015% | 0.0003–0.0004% |
| Noise Floor | 2.0–3.7uV | 1.8–3.0uV |
| Dynamic Range | 118–119dB | 121–122dB |
| Channel Separation (BAL) | 98dBr | 102dBr |
Key Improvements
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Higher Output Power: From 383mW → 632mW balanced
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Cleaner Sound: Lower distortion & noise floor
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Better Detail: Higher dynamic range & SNR
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Wider Stage: Improved channel separation
✅ Verdict: The HiBy R6Pro II 2025 is not a minor update—it’s a major leap forward, offering desktop-class power and refinement in a portable DAP. If you own the original, the upgrade is well worth it.
Why Choose the HiBy R6Pro II 2025?
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First-ever dual CS4308P DAC portable player
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Desktop-grade output power in a pocket-sized form
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Flexible Class A / AB amplification
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Flagship build & HiByOS integration
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Audiophile-grade tuning with everyday usability
The HiBy R6Pro II 2025 is the ultimate portable choice for audiophiles in 2025—a lossless Hi-Res DAP that blends raw power, musical warmth, and modern versatility.
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Let customers speak for us
It is the best and clean sounding IEM, perfect for the Beginner.
I love the fact that I can change the nozzle and its a little different sounding, so its two in one.
The cable quality is out of the world no external sound when I touch it.
I can hear so many details clearly. I say please go for this, it is perfect first IEM and the Perfect Upgrade if you had IEM under 2k before
It provides Awesome sound quality go and buy it m
🎧 KZ Castor Pro IEM – Review
🔊 Sound Quality
The KZ Castor Pro delivers clear and detailed sound with excellent separation across lows, mids, and highs. The decent thumping bass is tight and controlled, giving energy to tracks without overwhelming the vocals or instruments. Its super-balanced tuning ensures a natural, enjoyable listening experience suitable for all genres.
🎚 Unique DIP Switch Equalizer
What sets the Castor Pro apart is its DIP switch physical equalizer. With up to 16 different tuning options, it allows listeners to adjust the sound profile on the go—boosting bass, enhancing treble, or keeping it neutral. This feature gives it a level of flexibility rarely seen in IEMs at this price point.
🔇 Noise Isolation
Although it lacks active noise cancellation, the design offers an excellent passive seal. The snug fit ensures that outside noise is effectively blocked, making the listening experience immersive and ensuring ANC doesn’t feel like a missing feature.
🎼 Hi-Res & DAC Performance
For those using Hi-Res lossless audio, pairing the Castor Pro with a DAC is highly recommended. The extra power and clarity from a DAC enhance the already impressive soundstage, detail retrieval, and overall dynamics, making the listening experience truly premium.
💰 Value for Money
At its smart price, the KZ Castor Pro punches well above its weight. It combines detailed sound, punchy bass, balanced tuning, and innovative features—making it a strong choice for both audiophiles on a budget and everyday music lovers.
Have been using these buds for like an year now, they gave me a great time all that while, only recently the cable started getting green and there was an issue with audio drop on even a slight movement (like every earphone ever), but still a great investment for an year.
Got this as my first iem from audio store.. much much more worth than the price.. the bass!!.. my gawddd, it's something which is gonna surprise you.. I got it paired with the moondrop echo a dac.. and trust me, couldn't have asked for anything better.. and the delivery was done to me in kolkata, just within a day.. remarkable job audio store!♥️
Loved the new gear they sound absolutely phenomenal and mind if say the looks and aesthetic of the KZ Castor Pro is underrated for its price, as a newbie I was a little hesitant to jump in this rabbit hole, but it was worth it. Shoutout to The Audio Store to build up my courage, they were very helpful as I was placing my order I fumbled and they responded very positively and helped me correct my mistake. Thank You
Excellent performance with ANC good mic this song is like heaven
It is better compared to normal tws
Perfect for beginners to start their audiofile journey
I'm satisfied and convinced of this product
The packaging
The quality
And The performance
Trust he go for this one if you never try this one
Just give it a try you will not regret it
I have manny IEM's I'm my collection
But this one is really fantastic
Thanks to The Audio Store
They have many discount in compar to others in market
And shippment is on the time no worrys
1999 is nothing the engineering is perfect of this IEM,,,
Amzing product
Love the way it sounds rich in every range perfect for beginners but if you're not a bass head go for non bass varient.
This is my first ever IEM that I purchased after research of couple of months. And I can say that this was a good decision on my end. Cable is good. Buds look stylish. Comes with a small carry pouch and 6 pairs of ear tips. Sound quality is awesome. Love the instrument separation. Customisable EQ gives them versatility. You can actually experience how other IEM sound just be playing around with the EQ.
Actually, l'm new to this IEM world. Such an amazing product. If you are new to iem just as me, I would highly recommend his product to try out. The OG. There are 16 types of tuning options to play around and explore your favourite music in a new way and the build quality is also pretty good. Overall a nice product 👍.
Good sound
5/5 Mids and Highs
5/5 Well balanced Bass, doesn't overpower the music
5/5 Design look premium and classy
They are quiet heavy and huge
