Yogi’s Burson Funk with Buchardt Audio S400, KEF Q100 and Audeze LCD-2

• Impedance: 4 Ω (minimum not published)
• Sensitivity: 87 dB (reference not stated)
• Frequency response: 33 Hz – 40 kHz ±3 dB (in-room)
• Recommended amplifier power: 40 – 200 W

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• 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 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. ^{[2] [3] [4] [5]}

• Impedance: 25 Ω
• Sensitivity: 106 dB (reference not stated)
• Frequency response: 5 Hz – 45 kHz
• Plugs / cables supplied: fixed or detachable (2.5 mm cup sockets) 1.5 m cable, 3.5 mm plug + 6.3 mm adapter
• Other: max input 1,800 mW; 370 g without cable

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• Impedance: 25 Ω
• Sensitivity: 94 dB/mW ≈ 110.0 dB/V (calc.)
• Frequency response: 5 Hz – 45 kHz
• Plugs / cables supplied: detachable 3 m braided Y cable, 6.3 mm plug
• Other: max input 1,800 mW; 350 g without cable

Matching notes: At 25 Ω and 94 dB/mW, the TH-X00 is a low-impedance load: about 1 V (40 mW, 40 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. ^{[8] [9] [3] [4] [5]}

• 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

^{[3] [4] [5]}

• Output power (XLR / SE): 16 Ω 8 W / 4 W · 32 Ω 4 W / 2 W · 100 Ω 1 W / 0.5 W · 150 Ω 0.6 W / 0.3 W · 300 Ω 0.3 W / 0.15 W
• Output impedance: 0.5 Ω (headphone); 25 Ω (pre out)
• Gain: High / Medium / Low (manual); dB not published
• Inputs: 1x XLR; 1x RCA; mic bypass
• Input impedance: 35 kΩ
• Input sensitivity: standard line level
• Outputs: XLR pre out; 4-pin XLR + SE headphone
• Other: Model M-120X (3XP); THD <0.0015%; FR ±1 dB 0-48 kHz

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• Frequency response: 20 Hz – 20 kHz (+0.01 / -0.03 dB)
• Output power (XLR / SE): 16 Ω 6 W / 3 W · 32 Ω 6 W / 1.8 W · 300 Ω 0.8 W / 0.2 W · 600 Ω 0.4 W / 0.1 W
• Output impedance: <0.1 Ω (balanced); <0.05 Ω (SE)
• Gain: balanced 0.66x / 2.0x / 6.6x (-4 / +6 / +16 dB); SE 0.33x / 1.0x / 3.3x (-10 / 0 / +10 dB)
• Inputs: XLR-3 stereo; RCA
• Input impedance: 50 kΩ
• Outputs: 4-pin XLR balanced; 6.35 mm TRS; 3.5 mm TRS
• Other: power at <1% THD; THD -143 dB (300 Ω, 1 mW, balanced); SNR 136 dB; 24 V DC brick; 1.52 kg

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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. Buchardt Audio S400: buchardtaudio.com
2. Audeze LCD-2: audeze.com
3. Burson Funk product page (funk page)
4. Burson Funk product page (funk page, archived 2021)
5. Burson Funk User Manual V1.5 (Burson downloads)
6. E-MU Teak: mubychan.com (successor seller page)
7. E-MU Teak: head-fi.org (successor seller page)
8. Fostex TH-X00: headfonics.com (review reproducing fostex x massdrop spec)
9. Fostex TH-X00: PDF (stereophile.com) (review reproducing fostex x massdrop spec)
10. Burson Soloist 3X Performance product page
11. Drop THX AAA 789: PDF (images-na.ssl-images-amazon.com) (drop spec sheet pdf)