Sean’s Burson Funk with KEF LS50 and Audeze LCD-2C

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Sales Burson
September 3, 2021

Post Info

Feedbacks - Funk
and Kef LS50 (Non-Meta), Audeze LCD-2C, Burson Funk, KEF LS50, Topping D90SE

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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

Matching notes: The KEF LS50 is rated at 85 dB (2.83 V / 1 m) into 8 Ω nominal (3.2 Ω minimum). Burson rates the Funk at 35 W into 8 Ω and 45 W into 4 Ω. At that rating the speaker would reach about 100 dB SPL at 1 m (calc., one speaker, before room gain). KEF recommends 25 – 100 W amplifiers. ^{[1] [2] [3] [4]}

Audeze LCD-2 Classic · Headphones: open-back, planar magnetic, circumaural

Impedance: 70 Ω
Sensitivity: 101 dB/1mW (at Drum Reference Point) ≈ 112.5 dB/V (calc.)
Frequency response: 10 Hz – 50 kHz
Plugs / cables supplied: 4-pin XLR cable; 4-pin XLR to 6.35 mm adapter cable; 6.35 to 3.5 mm adapter
Other: recommended power >250 mW;

Matching notes: At 70 Ω and 101 dB/mW, the LCD-2 Classic is a low-impedance load, and an efficient one: about 0.75 V (7.9 mW, 11 mA) for 110 dB SPL (calc.). Burson does not publish a 70 Ω rating for the Funk. Its 32 Ω and 100 Ω ratings (2.5 W SE; 0.6 W SE) fall either side of it. The Funk’s under 2 Ω headphone output impedance is less than 1/35 of the load. ^{[5] [2] [3] [4]}

Burson

Burson Funk · Headphone amplifier / integrated amplifier

Output power (headphone): 16 Ω 3.5 W · 32 Ω 2.5 W · 100 Ω 0.6 W · 150 Ω 0.4 W · 300 Ω 0.15 W
Power: 8 Ω: 35 W · 4 Ω: 45 W
Output impedance: <2 Ω (headphone)
Gain: not published
Inputs: RCA L/R
Input impedance: 38 kΩ
Outputs: headphone (SE); speaker terminals
Other: Model P-300; THD <0.03%; FR ±1 dB 0-35 kHz; speaker S/N 92.5 dB

^{[2] [3] [4]}

Also in the system

Topping D90SE · DAC: balanced desktop DAC (ES9038PRO, MQA, Bluetooth 5.0) · discontinued

Frequency response: 20 Hz – 40 kHz (±0.3 dB)
Output impedance: 100 Ω (RCA and XLR)
Output voltage: RCA 2.1 V (4 V mode) / 2.6 V (5 V mode) · XLR 4.2 V (4 V mode) / 5.2 V (5 V mode)
Inputs: USB (PCM 768 kHz/32-bit, DSD512); AES; optical; coaxial; Bluetooth (LDAC, aptX HD)
Outputs: XLR; RCA
DAC / chipset: ESS ES9038PRO; XMOS XU216; Qualcomm CSR8675
Other: XLR: THD+N <0.00005% @ 1 kHz, SNR / DR 134 dB; RCA: THD+N <0.00007%, SNR / DR 127 dB

^{[6] [7]}

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.