Some thoughts on ASR and the reviews


I’ve briefly taken a look at some online reviews for budget Tekton speakers from ASR and Youtube. Both are based on Klippel quasi-anechoic measurements to achieve "in-room" simulations.

As an amateur speaker designer, and lover of graphs and data I have some thoughts. I mostly hope this helps the entire A’gon community get a little more perspective into how a speaker builder would think about the data.

Of course, I’ve only skimmed the data I’ve seen, I’m no expert, and have no eyes or ears on actual Tekton speakers. Please take this as purely an academic exercise based on limited and incomplete knowledge.

1. Speaker pricing.

One ASR review spends an amazing amount of time and effort analyzing the ~$800 US Tekton M-Lore. That price compares very favorably with a full Seas A26 kit from Madisound, around $1,700. I mean, not sure these inexpensive speakers deserve quite the nit-picking done here.

2. Measuring mid-woofers is hard.

The standard practice for analyzing speakers is called "quasi-anechoic." That is, we pretend to do so in a room free of reflections or boundaries. You do this with very close measurements (within 1/2") of the components, blended together. There are a couple of ways this can be incomplete though.

a - Midwoofers measure much worse this way than in a truly anechoic room. The 7" Scanspeak Revelators are good examples of this. The close mic response is deceptively bad but the 1m in-room measurements smooth out a lot of problems. If you took the close-mic measurements (as seen in the spec sheet) as correct you’d make the wrong crossover.

b - Baffle step - As popularized and researched by the late, great Jeff Bagby, the effects of the baffle on the output need to be included in any whole speaker/room simulation, which of course also means the speaker should have this built in when it is not a near-wall speaker. I don’t know enough about the Klippel simulation, but if this is not included you’ll get a bass-lite expereinced compared to real life. The effects of baffle compensation is to have more bass, but an overall lower sensitivity rating.

For both of those reasons, an actual in-room measurement is critical to assessing actual speaker behavior. We may not all have the same room, but this is a great way to see the actual mid-woofer response as well as the effects of any baffle step compensation.

Looking at the quasi anechoic measurements done by ASR and Erin it _seems_ that these speakers are not compensated, which may be OK if close-wall placement is expected.

In either event, you really want to see the actual in-room response, not just the simulated response before passing judgement. If I had to critique based strictly on the measurements and simulations, I’d 100% wonder if a better design wouldn’t be to trade sensitivity for more bass, and the in-room response would tell me that.

3. Crossover point and dispersion

One of the most important choices a speaker designer has is picking the -3 or -6 dB point for the high and low pass filters. A lot of things have to be balanced and traded off, including cost of crossover parts.

Both of the reviews, above, seem to imply a crossover point that is too high for a smooth transition from the woofer to the tweeters. No speaker can avoid rolling off the treble as you go off-axis, but the best at this do so very evenly. This gives the best off-axis performance and offers up great imaging and wide sweet spots. You’d think this was a budget speaker problem, but it is not. Look at reviews for B&W’s D series speakers, and many Focal models as examples of expensive, well received speakers that don’t excel at this.

Speakers which DO typically excel here include Revel and Magico. This is by no means a story that you should buy Revel because B&W sucks, at all. Buy what you like. I’m just pointing out that this limited dispersion problem is not at all unique to Tekton. And in fact many other Tekton speakers don’t suffer this particular set of challenges.

In the case of the M-Lore, the tweeter has really amazingly good dynamic range. If I was the designer I’d definitely want to ask if I could lower the crossover 1 kHz, which would give up a little power handling but improve the off-axis response.  One big reason not to is crossover costs.  I may have to add more parts to flatten the tweeter response well enough to extend it's useful range.  In other words, a higher crossover point may hide tweeter deficiencies.  Again, Tekton is NOT alone if they did this calculus.

I’ve probably made a lot of omissions here, but I hope this helps readers think about speaker performance and costs in a more complete manner. The listening tests always matter more than the measurements, so finding reviewers with trustworthy ears is really more important than taste-makers who let the tools, which may not be properly used, judge the experience.

erik_squires

Now to be fair we know very well how "halo effect" in psychology really works...

If a product as a stradivarius is surrounded by an aura of holy S. Q. because of his price tag and historical meaning, acousticians will use blind test to study the relation between perception evaluation and the biases associated with it for example in a study of the stradivarius materials composition compared to modern violins.....

This does not means that human hearing is not faithful this means that he must be supervised when the "Holy value and price tag" play a role and put under controls and trained anyway...

This in no way can be used as an argument to devaluate all hearing abilities and mocking them as "golden ears" and militate to replace listenings evaluation by electrical small set of measures of the gear design and systematic double blind test in regular day to day audiophiles decisions and optimization process ...

Thanks very much Amir for your measures service review indeed ... But we dont need the ideology which some ASR people stick to ...

 

Now if i was wrong here stating that Human hearing is generally very trustful this article will be wrong relating to this discovery explained very well here :

https://physicsworld.com/a/human-hearing-is-highly-nonlinear/

«People can simultaneously identify the pitch and timing of a sound signal much more precisely than allowed by conventional linear analysis. That is the conclusion of a study of human subjects done by physicists in the US. The findings are not just of theoretical interest but could potentially lead to better software for speech recognition and sonar.

Human hearing is remarkably good at isolating sounds, allowing us to pick out individual voices in a crowded room, for example. However, the neural algorithms that our brains use to analyse sound are still not properly understood. Most researchers had assumed that the brain decomposes the signals and treats them as the sum of their parts – a process that can be likened to Fourier analysis, which decomposes an arbitrary waveform into pure sine waves.

However, the information available from Fourier analysis is bound by an uncertainty relation called the Gabor limit. This says that you cannot know the timing of a sound and its frequency – or pitch – beyond a certain degree of accuracy. The more accurate the measurement of the timing of a sound, the less accurate the measurement of its pitch and vice versa......

Oppenheim and Magnasco discovered that the accuracy with which the volunteers determined pitch and timing simultaneously was usually much better, on average, than the Gabor limit. In one case, subjects beat the Gabor limit for the product of frequency and time uncertainty by a factor of 50, clearly implying their brains were using a nonlinear algorithm.»

 

 

 

This means that the eras/brain work in his own time domain and in a non linear way. The Fourier maps are not enough to understand human hearings. They are only a part of the complete unknown process which is mysterious in all his ramifications.

 

 

 

«My ears lie sometimes and my wife too but they are trainable and truthful at the end of my day»--Groucho Marx 🤓

" few electrical measures of the design pieces will not do and measuring speakers will not be enough to complete the optimization process."

 

A few measurements are insufficient perhaps, but very useful. Ears don’t lie. They just do what they do. Brains come up with stories about what the ears did. Brains try to tell a useful story. Hence we don’t evaluate colors for precisely what hit our retinas in one particular area, but interpret the color that hit there in relation to what hit in other areas. This is why painting is so hard. The photograph changed painting because it just happened mechanistically, directly, without judgement, without having to pass in and out of a human perceptual filter, and allowed us for the first time to see what a picture looked like when our filters got out of the way. I should include the camera obscura as step in that direction too. 

A few measurements are insufficient perhaps, but very useful.

Only ignorants will contradict that...😊

 

But only ignorant will use this to dismiss any listeners impressions.. As some objectivist do systematically ...

Photography indeed is an art too, it is the eye of human who do the job and the negative treatment or DSP used artistically by the users...

And yes painting is very hard. This is why i admired painters as much as musicians...

I like Vinci and Turner... And i am very fond of naive and primitive art....

 

As Amir stated earlier, it’s really only when specific measurement claims are made and not met that there is any real problem. Nobody is doubting anyone’s subjective impressions and preferences, although we may doubt the stories told about what causes those preferences.

I like that kind of art too. I mentioned the photograph’s effect because at one time I was looking at paintings made through the centuries and noticed a sudden ability towards incredible realism around the late 1800s. It then occurred to me that it happened about when photography hit the scene, and then I learned that a lot of art focused people consider that kind of art to be not very good art. It would have been an incredible feat if someone had done it without seeing photography. And there were some who did it at least somewhat by using camera obscuras.

Art is wed to science

but nobody will ever know which one is the mother

and which one the  father here

because they reincarnate together for eternity

and change sex... 😊

We are their children though....