Amplifier Choice for Triangle Borea BR08: Burson vs Atoll vs Audiolab

[Martin Rony]

I have found a single review which measured the FR and impedance of the BR08:

TRIANGLE BOREA BR08 Review - Gallic charm « 7Review

The Borea BR8 floorstanding loudspeaker from Triangle of France charms Noel Keywood. Read our TRIANGLE BOREA BR08 Review.

7review.com

Using a tool to extract the data from the tiny, tiny graph at the end the impedance dips down to 2.0 Ohms at 114 Hz and stays below 3 Ohms from at least 90 to 235 Hz. At 1 kHz it's 8.1 Ohms, so the nominal impedance is correct - the minimum seems to be quite a bit lower than specced, though.

Nice review

 

[Ropeburn]

No, it's a protection only. In my country (Bangladesh)its summer season now. My room temparature is avarage 38° celcius during day time. Though Burson is highly biased calss A and it has Class A Amplifier, it draws high current all time even remain idle. So as per my condition it's essential extra cooling system.
Thanks

Good heavens. And I thought 38° outside was bad. Stay safe mate

 

[Redacted]

What better case for using a class-D than suffering 38C ambient!

 

[Paul7777x]

Good heavens. And I thought 38° outside was bad. Stay safe mate

Indeed. How on earth do you not melt?

It was around 27” here on Saturday. And I died. Lots of times.

 

[Morinor]

The Aune looks like a 100% transparent headphone amp. The manufacturer even published the measurements on their website: -112 dB THD and imperceptible noise. Low output impedance, flat FR. I'm sounding like a broken record here, but there is nothing special about class A and there is no magic required to reproduce voltage over time with sufficient bandwidth for audio at a couple of Milliwatts.

The Aune is a clean preamp. It was much better using it as preamp on a Cambridge CXA61 instead of its volume pot. It was clearer and the perceivable depth was increased. It is not "fuzzy" at all, I will use some words that I have heard describing it as "rich" or "dense". Also a comment about measurements. They are related with the maximum voltage that the a device produces, usually it comparable on DACs as they have the usual 2v or 4v. This is not straightforward with the preamp and amplifiers. Usually unity gain measurement is used or 5watt at 4ohms, but I unfortunately not always especially from manufacturers. As there is no independent measurement also we are missing the relation of 2nd and 3rd harmonic with the fundamental frequency and the rest of harmonics. Attenuation also I think should be considered. If I try to make the Aune work at unity gain and use Eversolo as volume attenuator, I have the feeling that the sound was much closer to have the Eversolo attached directly with nothing in between if not completely the same.
As for class A yes I can agree that doesn't matter, but it is usually used on preamps as it is easier to be implemented there. My ifi Zen Can is another class A preamp/headphone amp. It doesn't sound as clean, it is more "fuzzy" instead blurring a little bit the output. It can be seen as rest of the harmonics are higher, closer to 2nd and 3rd harmonic although they decline. I am suspecting that the JFET used is to be related, although the same doesn't apply on all JFET implementations.