They are a labor of obsession I not heard them but imagine they need a lot of room to breathe

Thanks guys - Mikemusic invited me along here.

Yes, labour of love and lots of evolution from the first 2 way through 3 and 4 and 5 way. Driver and horn shape evolution too, from the conicals to Tractix / Exponential on mid bass.

I've loved every minute of it and would say to anyone who's thinking about a speaker project - jump in. There's so much to learn and it can be done on a reasonable budget.

If anyone is interesting in dropping by for a listen - that would be fun...

The most recent evolution to be able to stream from USB to I2S to my a DIYaudio project (called Najda), an all singing all dancing DSP / 4 DAC / Pre / ADC / crossover system. The control board for this was purchased and I (like many others, housed and powered it).
I was amazed at this units ability to pass through an analogue signal with pretty much total transparency - It performed as well as my Puresound L10 pre and existing DAC solution for both analogue and digital.
Add to that all the other goodies that DSP brings, like proper time alignment (important on a system like this, and manually implemented room correction (used carefully it really tames bass room modes - I do not use it on the upper 3 channels as there is not need in my system / space).
I was using Coaxial or optical SPDIF input but I2S input is that bit purer and better.
It also means I can stream upto 384Kbit/s sampled flacs. Which is interesting.

To answer John's point about space to breathe - Not really I have them in a room some 5.5m x 4.5m with a slightly vaulted ceiling...
Set out wide and the tapped horns in the corners it works really well. Yes, I'd like a converted barn to at least try them in someday:) but they work very well and blow me away everything I put some interesting music on.

If there's interest I can write a summary of the components and crossover frequencies etc and why I came to this was of cutting the frequency spectrum cake.

Thinking strongly of going down a similar active digital route to your Steve

Yes sounds good I am certainly up for that
Be good to chat to someone who has gone down the active route

Quite a change in design since I heard them, Steve (when they were close to your Scalford photo). How would you describe the change in sound?

Yes, lots of changes - Drivers and horns and active / DSP.
The change has improved the bass control / room interaction. Different bass horns / drivers have given more texture and punch and a fuller lower bass.
Better drivers on the upper mid (not the legendary Vitavox S2's (refurbed by Mike at Vitavox) and on wooden tractrix horns has really made a big improvement in realism and easy of listening if that make sense. The conicals on the upper mid (smallest horns) were a bit too direct and in your face. The tractrix blend better into the room and sound more natural and realistic. Female vocals / guitars / violins etc can sound stunning. The S2's are also faster and keep up with the most demanding orchestral pieces in a way that I'd not heard before.
BTW I don't use a DSP X/O on the S2's or the Raal Lazy ribbon tweeters - these are just 1st order on caps. 3uF and 1.1uF respectively. There is method to the this.
I measure each driver in room from the listening position with a calibrated mic using HolmImpulse. The caps just sound slightly better. The signal is still going through DSP and is time delayed to enable alignment with the tapped horns that are about 9ms behind the rest otherwise.  

Sundays - noted Mike:)  

Thanks for showing pictures of the amp set up Steve

Yes, I have about 100m of speaker cable in use - so swank foo cable is not an option, budget wise or sheer thickness to accomdate:)
Good OFC cable is what I use. Of course I am only sending each relatively narrow freq band signal down each of the 5 sets of cable so perhaps don't need such mega cable as each cable pair is doing less work - Never going to find out though as demoing cable that might be better is not really an option.

Thanks, Steve, for a very entertaining afternoon. Your speakers have come a long way and the sound is highly integrated (considering there are five drivers), incredibly focussed, tight, wide and tall. The height dispersion thing is interesting, no doubt because of the disposition of the drivers. The sound you are achieving from a file-based setup is remarkable.

Perhaps the most remarkable aspect was listening to vinyl via an ADC, DSP and DAC back to analogue again!