Sandeep’s Burson Funk with KEF LS50 Meta

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Sales Burson
April 16, 2021

Post Info

Feedbacks - Funk
Chord Mojo, KEF LS50 Meta

First Burson product, built very well, sounds great from the first half-hour I’ve had with it. Looking forward to testing it further and who knows, maybe buy another Burson Amp/DAC later on down the line.

The System

Listening with

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

Impedance: 8 Ω (minimum 3.5 Ω)
Sensitivity: 85 dB (2.83 V / 1 m)
Frequency response: 79 Hz – 28 kHz (±3 dB); 47 Hz – 45 kHz range
Recommended amplifier power: 40 – 100 W
Other: max SPL 106 dB

Matching notes: The LS50 Meta is rated at 85 dB (2.83 V / 1 m) into 8 Ω nominal (3.5 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 40 – 100 W amplifiers. ^{[1] [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

Chord Mojo · DAC / headphone amp: portable DAC / headphone amp (FPGA, battery) · discontinued

Output power (headphone): 8 Ω 0.72 W · 600 Ω 0.035 W
Output impedance: 0.075 Ω
Output voltage: RCA 3 Vrms (line level mode, 3.5 mm)
Inputs: Micro USB (768 kHz/32-bit, DSD256); 3.5 mm coax (768 kHz); Toslink (96 kHz)
Outputs: 2x 3.5 mm headphone
DAC / chipset: Chord custom FPGA
Other: dynamic range 125 dB; THD @ 3 V 0.00017%; supports 800 Ω headphones; 8 h battery

^[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.