Your gated times seems very long 
Thats what I thought when looking at it the 1st time, but thats what SW is stating. I've done these measurements some time ago so my memory regarding the precise details escapes me.
...my gated measurements doesn't seems that smooth. It usually hs some dips what seems to be room effect at around 3Khz, 7Khz etc.
What I do remember however, is that it took me a good while to get the gated measurements right. My room at that stage was about 4 x 5 m, with one 5 m side open to another room which is double the size of the one I was measuring in. What I ended up doing was to use various pieces of foam, fabric, cushions and the like, to try and get my room to a point where the measurements seemed acceptable. My ceiling was also more than 3 m high, which helped I think.
...give me an anechoic chamber and I will probably lock myself in there for months, measuring whatever I can find
!
The lack of proper speaker building environments can be frustrating, but I do believe that somehow this can contribute to systems that perhaps sound more realistic/pleasing having been developed in a real world environment, or for our specific room requirements.
SW is not perfect until you face the long and complicated learning curve, but is perhaps a good way of learning how to build good speakers if you are serious about it, not to mention just getting to grips with all the speaker lingo, concepts, etc. in the beginning.
At least it's free! and gives die-hards like us more moola to spend on good quality drivers which is so scarce in our country.
