The 1m measurement distance seems practical ... i guess
no one doubted that, it might also help to have
measurements comparable.
But i assume "normal" listening distances from 2m
on ... especially when talking about "audiophile" gear.
Double is not "close enough" to me.
So we might have to decide whether we want meaningless
measurements, but which are comparable to some extent
or
more realistic measurements which may be less
comparable, because preconditions are more difficult
to fullfill.
---
I would opt for meaningless and non comparable
measurements, smoothed for the marketing needs and
leaving enough freedom for interpretation in a
"chartist" manner.
That is the current state of affairs, we all are accustomed
to it, and it seems to be the best for manufacturers,
customers and audio journalists as well.
Especially the audio journalist career should not be
hampered by pre-conditions due to education and
knowledge or measurement results too close to human
judgement.
So we should leave things exactly like they are ...
no one doubted that, it might also help to have
measurements comparable.
But i assume "normal" listening distances from 2m
on ... especially when talking about "audiophile" gear.
Double is not "close enough" to me.
So we might have to decide whether we want meaningless
measurements, but which are comparable to some extent
or
more realistic measurements which may be less
comparable, because preconditions are more difficult
to fullfill.
---
I would opt for meaningless and non comparable
measurements, smoothed for the marketing needs and
leaving enough freedom for interpretation in a
"chartist" manner.
That is the current state of affairs, we all are accustomed
to it, and it seems to be the best for manufacturers,
customers and audio journalists as well.
Especially the audio journalist career should not be
hampered by pre-conditions due to education and
knowledge or measurement results too close to human
judgement.
So we should leave things exactly like they are ...
I would opt for no meausrement curves that will involve direct comparison among finished products. I takes the fun out of shopping around.😀 It also takes away the appreciation for a piece of state-of-the-art design.
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The thread has meandered in interesting directions around this question, and it makes me wonder about just what "measurement(s)" the OP means.
I suppose the SPL-at-one-watt-one-meter thing was first commonly done for DRIVER measurements so when picking drivers for a multi-way system one can compare the relative sensitivity of drivers within their operating ranges so maybe they could be approximately matched (among juggling and trading off other characteristics which may be more important), and any mismatch be corrected with a pad in the crossover.
This is usually given as a single SPL number for an in-range signal, but admittedly a frequency response curve would be ideal. Even then, I can imagine cantankerous posters saying how the response will change depending on baffle and cabinet, bla bla bla.
So perhaps we shouldn't even try to make ANY measurements, just throw some
For what i know of these measurements, they arent done at one meter, but in the farfield (Outside the area where distance changes FR) and is then calculated to a 1m reference.
Amplifier Power Required Calculator
I agree with you about energy-FR, and it is often aviable in a simplified form on datasheets as horisontal and vertical Q .
But it is very hard to do the necessary calculations to translate that energy into your own rooms acoustic without a very expensive program. (And... Furniture manufacturers almost never deliver absorbtion data for their products...)
Room modelling | Odeon
However, more complete data is sometimes aviable for use with such programs.
CLF Viewer
But i think that H/V Q data shoud be enough for a homeuser with some *experience* to estimate and compare different speakers and make a qualifed guess on how it is going to sound in a room.
Linearrays on the other hand, is always distributed together with predictionsoftware.
Church Sound: d&b audiotechnik Releases New Version 6 of ArrayCalc Simulation Software - Pro Sound Web
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It's not that speakers are always measured at one meter with one watt. That's just become the standard way of expressing the results of tests -
According to EV -
"The T18's axial frequency response was measured in Electro-voice's large anechoic chamber at a distance of 3 meters with a swept sine wave input of 4 volts. Figure 1 has been averaged and corrected for 1 watt at 1 meter"
but
"Sensitivity (SPL measured at 1 meter, 1 watt input, anechoic environment, band limited pink-noise signal, 50 - 200 Hz): 99dB-full space"
so the actual measurement conditions vary...
According to EV -
"The T18's axial frequency response was measured in Electro-voice's large anechoic chamber at a distance of 3 meters with a swept sine wave input of 4 volts. Figure 1 has been averaged and corrected for 1 watt at 1 meter"
but
"Sensitivity (SPL measured at 1 meter, 1 watt input, anechoic environment, band limited pink-noise signal, 50 - 200 Hz): 99dB-full space"
so the actual measurement conditions vary...
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