Mitchel’s Burson Funk with KEF Q150 and AudioQuest Nighthawk

• Impedance: 8 Ω (minimum 3.7 Ω)
• Sensitivity: 86 dB (2.83 V / 1 m)
• Frequency response: 51 Hz – 28 kHz (±3 dB); 47 Hz (-6 dB)
• Recommended amplifier power: 10 – 100 W
• Other: max output 108 dB; 5.6 kg; crossover 2.5 kHz

Matching notes: The KEF Q150 is rated at 86 dB (2.83 V / 1 m) into 8 Ω nominal (3.7 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 101 dB SPL at 1 m (calc., one speaker, before room gain). KEF recommends 10 – 100 W amplifiers. ^{[1] [2] [3] [4]}

• Impedance: 25 Ω
• Sensitivity: 99 dB SPL / mW ≈ 115.0 dB/V (calc.)
• Plugs / cables supplied: 1.3 m cable, 3.5 mm TRRS to dual 2.5 mm mono; 3.5 mm to 1/4″ adapter
• Other: power handling 1.5 W; 346 g

Matching notes: At 25 Ω and 99 dB/mW, the AudioQuest Nighthawk is a low-impedance load: about 0.56 V (13 mW, 22 mA) for 110 dB SPL (calc.). Burson does not publish a 25 Ω rating for the Funk. Its 16 Ω and 32 Ω ratings (3.5 W SE; 2.5 W SE) fall either side of it. The Funk’s under 2 Ω headphone output impedance is less than 1/12 of the load. ^{[5] [2] [3] [4]}

• 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]}

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.

1. KEF Q150: archived page (web.archive.org)
2. Burson Funk product page (funk page)
3. Burson Funk product page (funk page, archived 2021)
4. Burson Funk User Manual V1.5 (Burson downloads)
5. AudioQuest Nighthawk: PDF (elusivedisc.com)