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Cayin HA-300 Mk3
Cayin HA-300 Mk3 – reference-class 300B tube amplifier delivering exceptional soundstage, natural tonality and surprising power for demanding headphones.
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Cayin HA-300 Mk3
Flagship 300B tube amplification with greater power, lower noise and wider headphone compatibility
The Cayin HA-300 Mk3 is the third generation of Cayin’s flagship 300B headphone and speaker amplifier. Built around a pure single-ended Class A topology, it preserves the rich tonal density, spatial depth and emotional immediacy that make 300B amplifiers so desirable, while adding more output power, improved power architecture and broader real-world usability.
With up to 6,500 mW + 6,500 mW from the 4-pin XLR output, 6,000 mW + 6,000 mW from the 6.35 mm output and a newly optimized 4.4 mm Pentaconn output for sensitive IEMs, the HA-300 Mk3 is designed to handle everything from in-ear monitors to demanding planar magnetic headphones.
Key Features
- Single-ended Class A design with Genalex Gold Lion PX300B output tubes
- Separate external power supply for improved isolation
- GZ34 / 5AR4 rectifier tubes for broader tube-rolling options
- DUELUND coupling capacitors and third-generation wide-bandwidth EI output transformers
- 4-pin XLR, 6.35 mm, 4.4 mm Pentaconn and speaker outputs
- Three-stage impedance matching: Low, Medium and High
Sound
The HA-300 Mk3 delivers the classic appeal of a serious 300B amplifier: textured mids, a large three-dimensional stage, natural harmonic richness and a sense of physical presence that makes voices and acoustic instruments feel alive. At the same time, the Mk3 adds better drive, grip and flexibility compared to earlier generations.
ZMF Headphones describes the Mk3 as “Dead quiet — even more so than the MK II” and highlights its “Classic 300B weight and euphonic harmonics”.
HiFi.Blog calls the HA-300 Mk3 a “serious working component” for committed music lovers.
The previous HA-300 Mk2 was already praised by Headfonics for its “Natural sound and wonderfully holographic soundstage”. The Mk3 continues this musical foundation while expanding power delivery, IEM compatibility and tube-rolling flexibility.
Who Is It For?
The HA-300 Mk3 is for listeners who want the unmistakable beauty of 300B tubes without giving up control, versatility or modern headphone compatibility. It is a flagship amplifier for emotional, immersive and highly refined listening.
Technical Specifications
| Amplifier Type | Single-ended Class A (300B) |
| Tube Complement | 2× Genalex PX300B, 2× JJ 6SN7, 2× JJ GZ34 / 5AR4 |
| Output Power (4-pin XLR) | 6,500 mW + 6,500 mW |
| Output Power (6.35 mm) | 6,000 mW + 6,000 mW |
| Output Power (4.4 mm) | 1,600 mW + 1,600 mW |
| Speaker Output | 8 W + 8 W |
| Frequency Response | 12 Hz – 35 kHz (±3 dB) |
| THD | < 1% |
| S/N Ratio | 100 dB (A-weighted) |
| Input Impedance | 25 kΩ (RCA), 12.5 kΩ (XLR) |
| Impedance Matching | Low: 8–64 Ω / Mid: 65–250 Ω / High: 251–600 Ω |
| Inputs | XLR, RCA |
| Outputs | 4-pin XLR, 6.35 mm, 4.4 mm, speaker terminals |
| Dimensions (Amp) | 286 × 368 × 205 mm |
| Dimensions (PSU) | 159 × 345 × 205 mm |
| Weight | 16.8 kg (amp), 10 kg (PSU) |
| Power Consumption | max. 160 W |
