Cayin RU9 Tube/Solid-state DAC Amplifier

Name: Cayin RU9 Tube/Solid-state DAC Amplifier
Brand: MusicTeck
Price: 424.0 USD
Availability: InStock

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$ 499.00

$ 499.00 - $ 499.00

$ 499.00

$ 424.00

$ 424.00 - $ 424.00

$ 424.00

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Description

Key Features

l Nutube 6P1 Application

Supports both single-ended 3.5mm and balanced 4.4mm PO/LO outputs.

Each output can toggle between tube and solid-state modes.

l Classic丨Modern丨SS

Classic：

·No global negative feedback; each stage uses local feedback.

·Tube amplification introduces higher total harmonic distortion (THD).

·Rich harmonic texture delivers a warm, nostalgic sonic flavor — classic “tube sound.”

Modern：

·Introduces global negative feedback to define total gain.

·THD is significantly reduced.

·Harmonically cleaner, quieter background while preserving the warmth of tubes.

·Yields a sweet, clear, and delicate modern tube audio signature.

Solid-state：

·Based on precision-tuned op-amp ICs and peripheral circuits.

·Offers neutral tonality, fast transients, and highly accurate audio reproduction.

·Ideal for listening to music with its original, uncolored character.

l Dual AKM AK4493SEQ DAC

Equipped with dual AK4493SEQ DACs, each operating in mono mode.

Left and right channels are decoded separately for lower crosstalk and better channel separation.

l 16-Core XMOS XU316 Processor

Employs the latest generation XMOS XU316 USB Audio solution for high-performance digital processing.

l Triple Power Supply Modes

Built-in 2000mAh lithium battery provides up to 4.7 hours of battery-powered use. Also supports USB power from the external device (without charging the battery), as well as external DC power supply for increased output power.

Compatible with QC/PD fast charging.

l Hyper Mode

A specialized feature designed for headphone usage under DC power supply. Increases static operating current and voltage for enhanced audio performance.

Balanced: 1000mW + 1000mW @ 32Ω; 1170mW + 1170mW @ 16Ω

Single-ended: 420mW + 420mW @ 32Ω; 610mW + 610mW @ 16Ω

l Magnetic Back Design

Magnetic rear panel allows seamless attachment to smartphones.

Includes a custom Cayin leather case — hand-stitched, supple leather, precise cutouts, and magnetic back for secure attachment.

Comes with a L-shaped USB cable, ergonomically angled to avoid hand obstruction.

l Vibration Isolation

Custom-designed anti-vibration system for the Nutube vacuum tube.

Features a custom-built silicon housing on an FPC flexible PCB and a pin-supported vertical suspension system to eliminate microphonics.

l Elegant and Compact

CNC-machined unibody metal chassis.

Weighs only 150g, and measures 15mm thick.

l Thoughtful Details

0.96" color display with adjustable brightness.

Knurled volume knob with refined tactile resistance.

Side-mounted multi-color indicator light for charging and sample rate/format display.

l Versatile Use Scenarios

USB Audio DAC

Supports UAC1.0 (driverless) and UAC2.0 modes.

Compatible with smartphones, computers, digital audio players, tablets, and gaming consoles.

S/PDIF Input/Output

Uses Qualcomm QCC5125 for high-definition Bluetooth transmission.
Supports LDAC and other HD Bluetooth codecs.

Dimension (mm)：100*70*15
Weight：150g

Ak4493 still in the monarch of kings.

Old skol Q5S TC dacs are been use in here which makes it astonishing..NuTubes..makes Rollin'seems diminishing. They should R2R tech aswell for futures releases.
Peace!

Amazing!

This unit has some great features and an amazing tonality. It has power to drive full-sized headphones and sensitive IEMs. I love the MagSafe capability as well. The only downside for me is the battery life. The 4-5 hour claim is generous as I don’t quite get that. But, the hyper mode via DC ups the tonal game considerably. The RU9 is my favorite DAC amp I own so far and I have been collecting for a while. Very happy with the purchase and you will be too.

Fantastic OTG Device

This is a perfect travel device and awesome in "desktop" mode in the office. It has a surprisingly tubey sound and can power my 300ohm ZMF headphones while being dead silent with IEMs.

MusicTeck was easy to work with, shipping was fast and secure

Great player ...sounds fantastic ... Classic tube timbre my favorite....attaches to phone magnetically ,easy to use controls, looks great feels great

When the jack stopped working on my wm1a I wanted something small but still with natural musical timbre. I had the W4, which was very resolving and great in its own way. I decided to try the ru7. I think it's great and has the kind of sound I was looking for. It really is a kind of synthesis in sound between the w4 and wm1a.

Canpur CP752B: A Resolution Monster Where Coherence Meets Power

The Canpur CP752B is nothing short of a revelation in the "summit-fi" landscape, effectively redefining what a flagship multiverse-driver IEM can do. The first thing that grabs you is the sheer scale of the soundstage—it is genuinely holographic. Where other IEMs might give you width, the CP752B uses its dual bone conduction drivers to create a 3D bubble that feels less like listening to earphones and more like sitting in a properly treated listening room. The separation is surgical without being sterile; you can pick out every layer of a complex track, yet the drivers—despite being a mix of BA, EST, Planar, and BC—blend with a coherence that is almost impossible to find in other "quadbrid" sets.

Tonally, these strike a brilliant balance that many are calling a refined "W-shape," bringing the best of all worlds. The bass is authoritative and massive, providing that visceral, textured rumble you usually only get from dynamic drivers, yet it retains the lightning-fast speed of balanced armatures. It hits with a weight that provides a solid foundation for the music without bleeding into the mids. Vocals are pushed forward just enough to be intimate and engaging, avoiding that distant "scooped" feeling, while the treble offers that elusive "sparkle without pain"—delivering immense air and micro-detail that extends forever without ever becoming sharp or fatiguing.

Finally, the build and package cement its status as an endgame monitor. The medical-grade resin shells are surprisingly comfortable for the driver count, and the collaboration with Eletech for the stock cable shows Canpur didn’t cut any corners. It is rare to find an IEM that manages to be both a technical monster and musically "fun" at the same time, but the CP752B pulls it off effortlessly. If you are looking for an IEM that competes with (and often wallops) sets costing significantly more, this is absolutely the one to beat.

The Epitome of the "Sophisticated Basshead" Monitor

Sound Signature Overview The Alpha & Omega Fulgrim can be best described as a "sophisticated basshead" audiophile monitor. It offers a masterclass in dynamic control, distinguishing itself by knowing exactly when to exhibit restraint and when to unleash power. Unlike typical bass-heavy IEMs that apply a blanket boost across the spectrum, the Fulgrim respects the mix; if a track demands neutrality, the low end remains disciplined. However, when the composition calls for it, the bass response is authoritative, visceral, and commanding.

Frequency Response Breakdown

Bass (The Foundation): With the stock Aura cable, the tuning exhibits a distinct bias toward the sub-bass region. The quality here is exceptional—highly textured, detailed, and deeply impactful. Crucially, despite the sheer quantity of low-end energy available, the tuning is meticulous; the bass creates a solid floor without ever bleeding into or muddying the lower mid-range.

Mid-Range (The Vocal Presence): Because of the clean separation from the bass, the mids are left uncolored and pristine. Vocals, both male and female, are rendered with clarity and high-resolution detail, ensuring the emotional core of the music is never lost behind the low-end drive.

Treble (The Resolution): The top end is characterized by excellent extension and a palpable sense of "air." Utilizing a configuration of 6 Electrostatic (EST) drivers, the Fulgrim achieves a transient response that is both resolving and authoritative. This technical capability ensures that no matter how thunderous the bass becomes, the treble remains distinct, piercing through the mix to reveal micro-details and atmospheric cues.

Technical Performance & Separation One of the Fulgrim’s standout technical achievements is its frequency separation. The three primary zones—Bass, Mids, and Treble—operate in distinct layers. There is no incoherent overlap or masking; the listener receives a holographic presentation where powerful lows and sparkling highs coexist without competing for acoustic space.

Synergy & Cable Pairing While the stock configuration provides a thrilling ride, those with a sensitivity to high-frequency energy may find the treble energetic. For these listeners, I strongly recommend pairing the Fulgrim with the Astral Acoustics "Luna" upgrade cable. This pairing introduces a subtle warmth that smooths out the sharper edges of the treble response while maintaining the IEM's inherent resolving capabilities, offering a more organic listen without sacrificing detail.

Verdict The Alpha & Omega Fulgrim is a rare beast: a monitor capable of satisfying the cravings of a basshead while maintaining the technical prowess required by a critical listener. Its ability to handle 99% of music genres with agility makes it a versatile endgame solution for those who want power without compromising on clarity.

Mest is Best

The rumble in the bass when the bone conduction works properly and the holographic soundstage... I got spooked when I heard a bird chirping behind me and turned back only to find out it was from the song.

Finally Surrounded

Pros:
Truly immersive, spherical soundstage that wraps around you
Exceptionally controlled, addictive bass
Two genuinely useful tuning switches
Can listen for hours without fatigue or discomfort
Outstanding technical performance (imaging, staging, resolution)

Cons:
Bass quantity won't satisfy those seeking maximum rumble

Sources
iBasso D17 (OS/L, AMP/L, Line Out, Volume 95)
Luxury & Precision EA4 (amplifier)

Summary
For context on where I'm coming from: my main priorities are soundstage, imaging, and layered bass—not boosted, just well-textured and controlled. I'm not chasing maximum slam or the most forward vocals. I want to feel like I'm inside the music.
The Pentara checked every box. It's replaced my FiR Audio Radon 6 as my daily driver and effectively retired both my Symphonium Crimson and Unique Melody Asahi. I just don't reach for them anymore.

Sound Signature & Comparisons

vs. FiR Audio Radon 6 (Previous Daily Driver)
The RN6 was my daily for a reason—that Kinetic Bass hits deep, and the soundstage is genuinely wide. But I always felt like the staging was a bit egg-shaped. Plenty of width, not as much depth or height.
The Pentara fixes this. It's the first IEM where I feel like the music actually surrounds me rather than just stretching left to right. The bass doesn't slam as hard as the RN6's Kinetic Bass, but honestly? I don't miss it. The Pentara's low end is so well-controlled and textured that it's become addictive in its own way. Throw on Yosi Horikawa's Fluid and you'll hear what I mean—there's real nuance down there.

vs. Symphonium Audio Crimson
Look, the Crimson is a fantastic value. Fun signature, punches way above its price. But I could never wear it for more than an hour or two before needing a break—partly fatigue, partly comfort.
With the Pentara, that problem doesn't exist. I can keep these in indefinitely. And beyond just comfort, the technical gap is real. Staging, imaging, overall presentation—it's a different league. I haven't touched the Crimson since getting the Pentara.

vs. Unique Melody Asahi
This one's straightforward. I only ever used the Asahi when I wanted something more mid-focused. The Pentara's Switch 1 gives me basically the same thing, so the Asahi became redundant overnight.
I keep the switch set to On most of the time for the extra bass and dynamics. When I'm in the mood for acapella or vocal-heavy tracks, I flip to Switch 1. Works perfectly. The Asahi now belongs to a friend.

Verdict
The Pentara turned out to be exactly what I wanted: the immersive staging the RN6 was missing, the technical chops the Crimson couldn't deliver, and enough versatility to make the Asahi unnecessary. If your priorities line up with mine—soundstage, imaging, textured bass—this one's worth a serious listen.

Cayin RU9 Tube/Solid-state DAC Amplifier

Key Features

Customer Reviews

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