Hello. I wasn't expressing my question properly, obviously. What I was curious about is what I thought I'd read- maximum travel one way. I wanted to know if this meant literally the maximum excursion, which to me would literally sum the amounts of travel from maximum retraction to maximum excursion.
Or if it meant what XMax normally means- maximum excursion from the at rest position. Throwing in the extra descriptor before XMax was throwing me.
I wonder why the arrestor isn't a normal feature on all Mark Audio drivers; I've had these as backups for years and haven't kept up with the newer iterations, so I don't know if it's still used or not as the designs move forward.
Or if it meant what XMax normally means- maximum excursion from the at rest position. Throwing in the extra descriptor before XMax was throwing me.
I wonder why the arrestor isn't a normal feature on all Mark Audio drivers; I've had these as backups for years and haven't kept up with the newer iterations, so I don't know if it's still used or not as the designs move forward.
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Frankly didn't pay any attention in that historically Xmax was described as max linear one way with no further specs, i.e. the +/- was assumed/a given till recent times of improved measuring systems and if one goes back to pioneer times the rule was 'if you can see it move it's distorting' since actual measured specs were later found to be only a mm or so.
As GM points out, Xmax is a nebulous figure at best since there isn't a single definition for what it actually is. 10% THD was one; there are about a dozen other methods of generating a figure for it, none of which usually give the same value if applied to the same drive unit -many are purely based on physical dimensions, without any kind of acoustic measurement rating. Personally I think it's about as useful as EBP (i.e. not very 😉 ) and it's made even more entertaining because many manufacturers don't tell you what method they used to generate that figure, or use it as a synonym for Xmech. For those who supply basic motor dimensions, it's sometimes possible to tell, but not always.
Be that as it may (apologies for the diversion) assuming you use one of the methods that key off the physical motor dimensions (e.g. Gander's, where you simply subtract the height of the VC winding from the VC gap, and divide the absolute value by 2), which are probably the most popular at the moment, then Xmax is ideally described in one direction from the driver's resting place, rather than as a point-to-point total, so '1 way' is just a different way of writing 'Xmax = +/- n mm'.
Be that as it may (apologies for the diversion) assuming you use one of the methods that key off the physical motor dimensions (e.g. Gander's, where you simply subtract the height of the VC winding from the VC gap, and divide the absolute value by 2), which are probably the most popular at the moment, then Xmax is ideally described in one direction from the driver's resting place, rather than as a point-to-point total, so '1 way' is just a different way of writing 'Xmax = +/- n mm'.
That's the one. This is what you get for typing after spending half the night watching the old 1960s Maigret series and polishing off a bottle of merlot... 
I hear ya! At least got you some pleasure from it; I had to do a major edit a little earlier thanks to maxing out allergy pills for too long........ 🙁
We have heard that it is cold in England. Energy costs a lot.. We in Sweden drink wine so we stay warm.. 😉😆
Mostly legal moonshine here till I chose to give up booze at 24 except for the occasional table wine on special occasions and a bit of Champagne on New Year's Eve over the decades.
It was more about the number of funerals I either went to, participated in, or couldn't get time off for, without threat of losing my job with the 'straw breaker' being losing my job, though was already applying for a much better one (turned out to be my career), so figured it was as good an excuse as any to convince myself. Unfortunately, my example was moot as I'm still losing what's left of friends, relatives to various controlled substances with (the threat of) Covid, cancer, etc., and the economy in general wreaking havoc with (what's left of) their retirement funds among other excuses.