Do distortion 's affect enjoyment of speaker?

I'll second Viridian's response, and I'll add that distortion measurements will be considerably different for a given speaker depending on what volume level and input power level they are taken at. Not only on the levels at the instant the measurement is taken, but I would expect also on the history of those levels over the previous seconds or perhaps even minutes, since that history will affect voice-coil temperature at any given instant. Unless the THD numbers that are being compared for different speakers are based on levels that are indicated and that are similar, apples are being compared with oranges. And as Psag stated earlier, lack of standardization of how such measurements are taken is rampant.

Also, as Marty alluded to earlier, how objectionable a given THD value is depends on the frequency that is being distorted. It also depends greatly on how the TOTAL Harmonic Distortion is distributed among the individual harmonic frequencies.

As I've said in a number of past threads, IMO the main usefulness of specs and measurements is in identifying and **ruling out** candidates that would be poor matches with either other components in the system (especially the power amplifier, in the case of speakers), or with the listener's requirements (e.g., peak volume capability, physical characteristics, perhaps deep bass extension, etc.). But not in selecting among candidates which make that cut. And in most cases THD numbers are useless in both respects.

Regards,
-- Al

Agree with Viridian and Al. Their views are more balanced. Too many variables in play.

I've often read that reviewers measure specs that are not relevant or important, and fail to measure specs that are. To a certain extent, at best, as Al said, specs may be useful to eliminate "bad choice" candidates, but not assure that a particular component will be a winner.

@Melbguy1 -- I've had my ears (pun) on the Magico S3s or S5s, for many of the reasons you just mentioned. And in time, I may wind up there. But right now, I'm obsessing over a type of distortion that many do not speak about or understand ... time coherence.

About 2 years ago, I've auditioned a pair of Vandies and IMO they did not do it for me. The response from some Vandy fans was that the dealer didn't know how to set them up. Or, the dealer used the wrong speaker cables. Or, my listening chair was in the wrong position. Or, the dealer used the wrong head vice. And so forth and so on.

Vandy buddies ... these explanations do not resonate (pun) with me.

Some time coherent speaker naysayers add that using 1st order x-overs requires the drivers to operate out of their "happy" zone. Or, the sloped baffles place a premium on proper placement and listening position. Or, the whole approach is at best a rough justice solution to a complicated problem.

So here is where I am holding. Rather than throw the baby out with the bath water ... I am holding onto my speakers for a while longer. I am going to test the time coherence waters with a DEQX device.

Trying to set up an in-home audition next week or the week after. For those not familiar with DEQX products, take a look at the DEQX website. I do not expect that the DEQX time coherence and room EQ solution will be a panacea.

Actually, I'm not sure what to expect.

But I'll report back.

Cheers,

BIF

08-06-14: Bifwynne
@Melbguy1 -- I've had my ears (pun) on the Magico S3s or S5s, for many of the reasons you just mentioned. And in time, I may wind up there. But right now, I'm obsessing over a type of distortion that many do not speak about or understand ... time coherence.

Both the S3 and S5 are amazing loudspeakers in their own way, given the right acoustical environment. I agree with your view of the Vandy 5a Carbons & Vandy 7. Yes, they are very good speakers, but I don't think i'd trade my S5's for even the 7's. I agree with your view that time coherence is important, though of course there are different ways you can achieve that. I recall asking Magico if the S5's are perfectly time and phase coherent & received this response - "If the question is, are the drivers summed in phase and the phase is perfectly aligned in the crossover region? Then yes." Subjectively i'd have to agree, the S5's are very coherent and well balanced.

"If the question is, are the drivers summed in phase and the phase is perfectly aligned in the crossover region? Then yes." Subjectively i'd have to agree, the S5's are very coherent and well balanced.
Melbguy1

The Magico guys are pretty slick & wiggled their way out of your question knowing quite well that you are not fully knowledgeable on this subject of time-coherence. You are not the only one in this situation - 99% of the crowd is in the same situation & the speaker manuf take advantage of this.
Just to be clear: I'm not berating you & neither am I trying to be harsh. merely stating the situation.
The Magico is phase-coherent only at its cross-over frequency & nowhere else! And this is pretty typical of almost all loudspeakers in the market - being phase coherent at the x-over freq comes about pretty easily. You can see from the measurements that tweeter & woofer are in-phase otherwise there'd be a big suckout at the x-over freq. Obviously that suckout is not happening so the speaker is phase coherent at the x-over. But that's about it re. phase coherence for this speaker. It's maintaining the phase relationship among all frequencies across the entire audio spectrum is where the expertise of the speaker designer comes into play.
Not withstanding the above, good to read that you are enjoying your Magico speakers... :-)