In my review (https://www.head-fi.org/showcase/burson-audio-fun.23238/reviews?page=3#review-20722) and @Wiljen review (https://www.head-fi.org/showcase/burson-audio-fun.23238/reviews?page=3#review-20948) we both found a sub-Ohm output impedance @1KHz. Also, with 16 Ohms headphones I found not an issue, so damping factor is very good.
Headphone Reviews and Discussion - Head-Fi.org
raoultrifan
manueljenkin
Amplifiers sound different to me because of gain/bandwidth/noise changes. The better the bandwidth the better the extension and more realistic it feels. I'd highly recommend trying sparkos ss3601 opamps on it. Mine came with V6 vivid which were very nice but I think I measured better bandwidth on 3601 though I need to re measure. Sonically, the V6 vivid was nice but the ss3601 setup sounded virtually flawless.
miceblue
@raoultrifan I just measured my output impedance right now and I'm getting around 7 ohms at 1 kHz.
manueljenkin
I'll try to measure OI, but my device is under rma now. Need to wait a while for replacement pcb.
raoultrifan
@miceblue you need to measure it again and post here the results of V RMS for different resistive loads. Thank you!
miceblue
@raoultrifan
10 ohms - 4.1 V
20 ohms - 6.8 V
30 ohms - 8.2 V
50 ohms - 9.3 V
100 ohms - 9.5 V
1 Mohm - 9.7 V
10 ohms - 4.1 V
20 ohms - 6.8 V
30 ohms - 8.2 V
50 ohms - 9.3 V
100 ohms - 9.5 V
1 Mohm - 9.7 V
