Nicholas’s Burson Funk with Sennheiser HD 660S and Definitive Technology D7

Published on

Sales Burson
May 10, 2024

Post Info

Feedbacks - Funk
Modi DAC

Very happy with the sound quality, the amp really makes my headphones sing. Also love the design and build quality. However, i just now experienced a short circuit inside the amp. Something sn[removed] and a bit of smoke came from the amp. I disconnected everything and that’s why i am writing this registration in order to file a warrenty request.

The System

Listening with

Sennheiser HD 660S · Headphones: open-back, dynamic, circumaural · discontinued

Impedance: 150 Ω
Sensitivity: 104 dB SPL @ 1 kHz, 1 V (as published) ≈ 95.8 dB/mW (calc.)
Frequency response: 9 Hz – 41.5 kHz (AU page); 10 Hz – 41 kHz (user manual)
Plugs / cables supplied: 6.35 mm unbalanced and 4.4 mm balanced cables (user manual)
Other: THD <=0.04% (1 kHz, 100 dB); max input 500 mW

Matching notes: At 150 Ω and 104 dB/V, the HD 660S is a high-impedance load that needs voltage more than current: about 2 V (27 mW, 13 mA) for 110 dB SPL (calc.). Burson rates the Funk at 0.4 W (SE) into 150 Ω, which is about 7.7 V RMS (calc.), roughly 12 dB more than that. The Funk’s under 2 Ω headphone output impedance is less than 1/75 of the load. ^{[1] [2] [3] [4] [5] [6]}

Definitive Technology D7

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

^{[4] [5] [6]}

Also in the system

Schiit Modi

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.