Goldenear Triton One.R - can it be driven with low power tube amp?

Goldenear Triton One.R: Review LAB Tests: by KEITH HOWARD
We measured a minimum modulus of 2.9ohm and a minimum EPDR of 1.3ohm at 92Hz, with further dips to 1.6ohm at 219Hz and 2.0ohm at 584Hz.
So the One.R is a tough loudspeaker to drive, despite its powered bass section.

No way could a 8w SET drive these OneR’s properly, it will work and "maybe" sound passable, but not what you would call driven properly especially in the mid bass/upper bass and lower mids to anywhere near it’s best potential.

Cheers George

cakids OP
Measurements indicate that the impedance between the critical 80 to 200 hz range is between 4.1 and 5 ohms.

Cakids, you need to understand measurements a little more, Keith Howard’s are the EPDR measurements (combined impedance and - phase angle) That the amp will see.

Goldenear Triton One.R:  Review LAB Tests: by KEITH HOWARD
We measured a minimum modulus of 2.9ohm and a minimum EPDR of 1.3ohm at 92Hz, with further dips to 1.6ohm at 219Hz and 2.0ohm at 584Hz.
So the One.R is a tough loudspeaker to drive, despite its powered bass section.

This is what the amp sees, not just the impedance, common stop going round in circles.

Cheers George

Again George I don’t believe that anyone reading this thread will find it misleading or confusing. People can appreciate real listening encounters versus supposition.

Supposition? the proof has been given by two reviews and two bench tests with graphs.
These speakers load is way too hard for an 8w SET or low powered tube to drive from the bass 80hz up. who partners a 1200w lower bass amp with a 8w set bass/upper bass amp!!!

And Keith Howard would not have stated this if it wasn’t just a supposition!!

HiFi Review LAB Test: by KEITH HOWARD
We measured a minimum modulus of 2.9ohm and a minimum EPDR of 1.3ohm at 92Hz, with further dips to 1.6ohm at 219Hz and 2.0ohm at 584Hz.
So the One.R is a tough loudspeaker to drive, despite its powered bass section.

To anyone thinking of buying theses speakers do your homework when buying an amp, or you’ll be a fool soon parted of his money if you believe these speakers can be driven to their best by low powered tube "flee" amps.
Only this type of 25w "flee amp" will drive them, ones that can double their wattage all the way down to 2ohm. 25watt only into 8ohms, ML2 monoblocks from Mark Levinson
https://www.hifido.co.jp/photo/05/504/50446/c.jpg
https://www.marklev.com/2013/04/ml-2-monophonic-class-power-amplifier.html

Cheers George

Here is what HIFI News reviewed and lab tested about these speakers, maybe now you'll realize that although the "8w SET made some nice sounds, they would have not been taken to perform at their best with an 8w set.

  LAB: KEITH HOWARD
 We measured a minimum modulus of 2.9ohm and a minimum EPDR of 1.3ohm at 92Hz, with further dips to 1.6ohm at 219Hz and 2.0ohm at 584Hz.
So the One.R is a tough loudspeaker to drive, despite its powered bass section.

Cheers George     

The Tritons need to be driven by your own amp from 80hz up to 400hz there's a lot of power asked from an amp in this mid bass upper bass to 200hz region and this is where Stereophile has given the impedance/phase loading that's well below 4ohms in conjunction with negative phase angle as well, this needs an amp that is more than a common 300b 8w SET can give.
Unless he has a purpose built special 8w set, that has 2ohm-4ohm output transformers with "low output impedance" and still able to give 8w. 

Cheers George

cakids OP
This is what your 8w SET will be trying to drive.
https://www.stereophile.com/images/1119GET1Rfig1.jpg

The 1.5kw lower bass amp has nothing to do with this graph, as it’s just the passive part of the speaker your SET will have to drive, and it's up to you to decide if you'll get enough drive and volume for you listening.
Cheers George

You really know your stuff regarding SE amps and high efficiency speakers.  

This sort of statement can be very misleading, and be misleading to many that don't know better.
As the Wilson Alexia has nearly identical efficiency to these Goldenear's, Stereophile measured the Alexia at 91.2db, but they have a very nasty impedance v -phase angle load. Even a very powerfull push pull tube will have a very hard time driving it, as for a 8w S.E.T.!! no chance in ****.
  
So one needs to look at lot more than "just efficiency", and learn to read impedance vs -phase angle graphs, which is even more important than efficiency all it's good for is to give you an idea how "loud" to can go, not how good the driving sound quality will be.

Cheers George    

Sandy Gross, the former designer/owner of Golden Ear uses a 8wpc SET amp on his GE Triton Reference speakers

I’d love to read about this, couldn’t imagine a 8w set driving this kind of load from 80hz> very well all the upper bass grunt is needed from there to 200hz https://www.stereophile.com/images/118GETRfig1.jpg has anyone got a link to where was that printed up or is it just hearsay?
Cheers George

Goldenear Triton One.R - can it be driven with low power tube amp?

Don’t think so https://www.stereophile.com/images/1119GET1Rfig1.jpg 

Stereophile There is still a combination of 4 ohms and –48° at 100Hz, which will require a good 4 ohm–rated amplifier to drive the speaker to acceptably high levels.

And also not the new GoldenEar BRX (Bookshelf Reference X) if you want to hear the best from them, with EPDR loads at 135hz of 1.5ohms!!! and again at 60hz of 2.1ohms!! And even at 200hz still difficult.

John Atkinson Stereophile bench tests.
(fig.1, solid trace) drops well below 8 ohms in the midrange and mid-treble region, with a minimum value of 3.24 ohms at 194Hz. There is also a combination of 5 ohms impedance magnitude with an electrical phase angle of –45° (dashed trace) at 120Hz
The BRX has minimum EPDRs of 2.15 ohms at 59Hz and 1.53 ohms at 135Hz, and the EPDR remains below 4 ohms in the midrange. This loudspeaker will work best with amplifiers that are comfortable driving loads below 4 ohms, which I suspect is why it proved a better match with the Parasound monoblocks

https://www.stereophile.com/images/820GEBRXfig1.jpg

Love to hear a pair with 2 x tall (80cm) fast motional feedback subs used as stands crossed over at around 60hz, they look the goods, in the bench tests for everything else, for a 2 way bookshelf.

Cheers George