Burson Soloist Voyager with KEF LS50 and Sennheiser HD 650

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Sales Burson
May 10, 2024

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Burson Soloist Voyager, Holo Audio Cyan 2, KEF LS50, Sennheiser HD 650

Dynamic and powerful is what I can said about the soloist Voyager

The System

Listening with

KEF LS50 · Speakers: bookshelf, two-way bass reflex (Uni-Q) · discontinued

Impedance: 8 Ω (minimum 3.2 Ω)
Sensitivity: 85 dB (2.83 V / 1 m)
Frequency response: 79 Hz – 28 kHz (±3 dB); 47 Hz – 45 kHz (-6 dB)
Recommended amplifier power: 25 – 100 W
Other: max output 106 dB; 7.2 kg; crossover 2.2 kHz

^[1]

Sennheiser HD 650 · Headphones: open-back, dynamic, circumaural

Impedance: 300 Ω
Sensitivity: 103 dB SPL @ 1 kHz, 1 V (as published) ≈ 97.8 dB/mW (calc.)
Frequency response: 10 Hz – 41 kHz
Plugs / cables supplied: 6.35 mm stereo jack plug (3.5 mm adapter)
Other: THD <0.05% (1 kHz, 1 V); 42 mm transducer

Matching notes: At 300 Ω and 103 dB/V, the HD 650 is a high-impedance load that needs voltage more than current: about 2.2 V (17 mW, 7.5 mA) for 110 dB SPL (calc.). Burson rates the Soloist Voyager at 0.64 W (XLR) / 0.32 W (SE) into 300 Ω, which is about 13.9 V / 9.8 V RMS (calc.), roughly 16 dB / 13 dB more than that. The Soloist Voyager’s 0.5 Ω headphone output impedance is 1/600 of the load. ^{[2] [3] [4] [5]}

Burson

Burson Soloist Voyager · Headphone amplifier / preamp (Class-A)

Output power (XLR / SE): 16 Ω 10 W / 5 W · 32 Ω 8 W / 4 W · 100 Ω 3.8 W / 1.9 W · 150 Ω 1.3 W / 0.65 W · 300 Ω 0.64 W / 0.32 W
Output impedance: 0.5 Ω (headphone); 25 Ω (pre out)
Gain: 3 levels: High full power (XLR 10 W / SE 5 W), Medium 50%, Low 10% (IEM); dB not published
Inputs: 2x XLR; 2x RCA; mic bypass
Input impedance: 38 kΩ
Input sensitivity: RCA 2 V; XLR 4 V+ (line level)
Outputs: XLR + SE headphone; XLR + RCA pre out; RCA subwoofer out
Other: THD <0.0015%; FR ±1 dB 0-48 kHz; Standard/Deluxe: 24V5A PSU or Super Charger 5A, V6 Vivid or V7 Vivid Pro; SP02 installed

^{[4] [5]}

Also in the system

Holo Audio Cyan 2 · DAC: discrete R2R ladder DAC (separate vector-step network for DSD, NOS / OS)

Output voltage: RCA 2.5 V (PCM) / 1.25 V (DSD) · XLR 5.0 V (PCM) / 2.5 V (DSD)
Inputs: USB-B (galvanically isolated; PCM to 1.536 MHz, DSD1024 native); I2S (PCM to 1.536 MHz, DSD1024); coaxial; optical; AES (PCM 192/24, DSD64 DoP)
Outputs: XLR; RCA
DAC / chipset: discrete R2R (no DAC chip)
Other: PCM 48 kHz NOS: THD+N 0.0005% @ 1 kHz, DNR -127 dB; DSD128: THD+N 0.0002%; 20 W; 3.5 kg

Matching notes: Burson lists the Soloist Voyager’s analogue inputs as RCA 2 V; XLR 4 V+ (line level) (38 kΩ input impedance). The Cyan 2 is rated at 2.5 V (PCM) / 1.25 V (DSD) (RCA) / 5.0 V (PCM) / 2.5 V (DSD) (XLR) output. ^{[6] [7] [4] [5]}

Specs from manufacturer data unless a source below says otherwise. “calc.” values are worked out from those figures (V = √(P × R); 110 dB SPL used as a loud reference level). Gear listed without specs is not in our spec library yet.