Cayin
HA-300 MK2
The HA-300 MK2 is Cayin's flagship transformer-coupled, single-ended triode (SET/SETA) tube amplifier, successor to the original HA-300, built as a two-chassis design with a separate power supply driven by a quad of NOS RCA 22DE4 rectifier tubes ([Headfonics review](https://headfonics.com/cayin-ha-300mk2-review/), [starspickeraudio.net](https://starspickeraudio.net/blogs/blog/cayin-ha-300-mk2-irresistible-sound)). It uses matched Gold Lion Genalex PX300B output tubes and Tung-Sol 6SN7GTB driver tubes to deliver both headphone amplification (up to 6W at 4-pin XLR) and true Class-A SET speaker amplification (8W per channel), with a 3-stage impedance selector to optimally match a wide range of headphones ([Cayin official product page](https://en.cayin.cn/features/7/59/574.html), [Cayin official manual PDF](https://cayin.com/ca-inhalte/uploads/2025/10/HA-300MK2-English-Manual-20220412.pdf)).
MSRP
$4,399
Used market · Good
$2,900
MSRP to used market
From $4,399 at launch to $2,900 today.
Specifications
- Price
- $4,399 USD (US market); €5,500 (EU market)
- Weight
- Amplifier: 19kg; Power Supply: 10kg
- S n ratio
- 100dB (headphone, A-weighted); 95dB (speaker, A-weighted)
- Dimensions
- Power Supply: 159 x 345 x 210mm; Amplifier: 286 x 368 x 210mm
- Inputs outputs
- 2x XLR, 2x RCA inputs; Headphone outputs: 6.35mm SE, 4.4mm balanced, 4-pin XLR balanced
- Speaker output
- 8W + 8W, 4–8Ω output impedance
- Frequency range
- 10Hz–45kHz ±3dB (headphone); 10Hz–40kHz ±3dB (speaker)
- Tube complement
- 2x Gold Lion Genalex PX300B (output), 2x Tung-Sol 6SN7GTB (driver), 4x NOS RCA 22DE4 (rectifier)
- Amplifier design
- Transformer-coupled, single-ended triode (SET/SETA), Class-A for both headphones and speakers
- Headphone output
- 4-pin XLR balanced: 2000mW (L) / 2400mW (M) / 6000mW (H); 4.4mm balanced: 800–2000mW (L/M) / 4500mW (H); 6.35mm SE: 1200–2200mW (L/M) / 5000mW (H)
- Power consumption
- 185W
- Headphone output rated
- 4-pin XLR balanced: 2000mW (L) / 2400mW (M) / 6000mW (H); 4.4mm balanced: 800–2000mW (L/M) / 4500mW (H); 6.35mm SE: 1200–2200mW (L/M) / 5000mW (H)
- Headphone impedance ranges
- Low: 8–64Ω; Medium: 65–250Ω; High: 251–600Ω
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