can you measure sub alone and speakers alone to see what is going on where they meet?
I’ll do that in a bit 
In that she’d take one look at those and say “If you can have them then I can have a new kitchen” ? (Dreadful everyday-sexist gender stereotyping duly noted.)
VB
Much better. Why a Bessel? What db slope?
Bessel 6dB/Octave, as I gather its the most phase accurate
I cant say I worry about phase in the sub, so long as they are in phase ish at the crossover point (not hard when the wavelength is 4m). As steep as possible is my preference.
Well it’s all looking much better. The sub integration looks fine to me on paper, although it’s worth trying different measuring locations to be sure you’re not just optimising one point. You may end up turning it down slightly, I think.
Could the 140-180 suckout be the positioning of the ATCs? Are they against the wall? Could be worth moving them back and forth to see how it changes.
Needs turning up about 6db 
but I like a room curve. Flat at listening position sounds orrible to me.
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Bit more fiddling, as per Ed’s suggestion, set the crossover at LR48 at 80Hz, the suckout appears to have gone now on the left channel, still there a bit on the right but much better. Now with a single mild (-4dB) EQ dip in the midrange for both sides, getting a very well matched pair…
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That looks really good. Well done.
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Thanks, getting there!
So, bit of fun today, put the Scanspeak 10F/Frugelhorn Lite back in the system, and subjectively sounding better than the SCM10s, fair bit more punch in the mid-bass but a little bright, this is with no EQ on the 10F drivers at all at the moment though.
Showing the system, left and right channels, some good matching straight away.
Red - 10F, Blue - SCM10. Both plots shown with no EQ on the mains, only on the sub.
Fun comparison though!
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Well in the last 6-9 months I’ve been pretty happy with the Tannoy Stirlings, and forsee them staying a while. 
I still have the ATC SCM10s too, as well as the little Scanspeak 10F Frugelhorn Lites.
Now I have the shed pretty much sorted, its time for a couple of projects. I have the plinth to make for the Denon DP-3000, as well as at some point, a nice simple plinth for the Thorens TD-160.
I’ve been doing some rationalisation on the DIY speaker bits, and I have still been searching for a nice pair of Goodmans Axiom 301s since the last pair I bought were damaged in transit and not usable…
A good pair of 301s are hard to find but I’ve taken a punt on a less well known model, the Axiom 10. As you would expect its a 10" Axiom without a whizzer cone compared to the 12" 201/301 models. The 12" were orientated towards Commercial/PA use where as the 10" was really for the domestic market.
Goodmans Axiom 10 by Robert Seymour, on Flickr
The Axiom 10s from what I can see were from the early 60s, there was a TwinAxiom 10 model, with as you would expect, a small whizzer cone. Later there were the 110 and 112 models, the 110 replaced the Axiom 10 and the 112 the same, but with a more powerfull magnet (1.6T vs 1.35T on the 10). The 112 models seem even more rare.
With a higher Qts of 1.1 I am planning another aperiodic enclosure, the brochure recommends around 5000 cu inches, so planning around the 75-80 Litre mark. This is also around the right size for a Axiom 301 ported enclosure too so I’ll make a front baffle that can be swapped out as/when I find a pair of 301s in the future. Its also a similar size required for the Supravox 165-2000 mk2 (aperiodic) and 285GMF (ported) which is cool if I did want to try those again in the future.
I’ve just been putting them through thier paces in mono, in a simple open baffle made from some spare insulation board I had left over from the shed build, certainly sounding promising!
Nice and smooth, supprising amount of top end considering the age/size. With a Qts of around 1.1, Fs 48 Hz and Qms 7.5 they actually do a good impression in the bass, nice and punchy as you would expect with Open Baffles. With an Mms ~11g they are reasonably efficient, DATS V2 says ~90db/2.83v but measuring the frequency response next to the Tannoys (93db/2.83v) at the same volume level/distance they are around 6dB more sensitive in the midrange and treble.
I do have a pair of Sica 1" horn tweeters I bought for the Axiom 301s (pictured below). Planning to keep the parts cost under £200 as a project, I’ll tweak first with the MiniDSP 2x4HD but the plan is to make a simple passive crossover, probably around the 7-8kHz range and use them with the Decware Zen, which is the driver for this project.
Goodmans Axiom 10 by Robert Seymour, on Flickr
Goodmans Axiom 10 by Robert Seymour, on Flickr
Goodmans Axiom 10 by Robert Seymour, on Flickr
Stirling vs Axiom 10 by Robert Seymour, on Flickr
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Are the 301s a big step-up from the 201s? They’re still playing well in my system - just love the sound they produce.
Also, I found on t’internet plans for a different enclosure for the Goodmans that looked very interesting. I’ll see if I can find it again but you may have already seen it before (think the guy was doing a comparison with Tannoys and Goodmans)
I was not able to actually try the 301s as they were damaged. As far as I’m aware the only difference between the 201 and 301 is the magnet, it’s much bigger (lower Qes & Qts) on the 301 so I’d expect the main difference to be in the bass quality and using in a smaller enclosure.
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Think it was this article…
Does anyone have supplier recomendation for 18mm plywood? I’ve previously just used someone from ebay, who cuts to size but as they are in the EU, less practical these days.
Just use your local timber merchant. I have two, one of whom does cut to size, and the cheapest one doesn’t.
Chap I work with just paid £60 a sheet. Although since found out there is a ply specialist in Falmouth that charges £35, so worth shopping around.