Thanks for the kind words Russell
To be honest I doubt I'll be doing much more of this - I like to keep active if only to give my finger joints some exercise (they get really creaky and crampy during the winter months..) but serious speaker design and construction doesn't quite rock my boat. I still can't quite get my head around the whole 'wave' business. If I hadn't had the speakers going begging I would probably have made a hat stand or something
I didn't get a lot of time to listen today because we had to be somewhere else but I was actually quite surprised they they didn't sound like complete shite given by what I had read beforehand and also what others have said earlier in this thread. I think they will be very music mode dependent - I did listen to a short piece of classical via BBC 3 on the RPi but they clearly aren't subtle enough for that, smooth jazz would also probably suffer (might try a little Coltrane though tomorrow if I get the chance)
As to adding a tweeter, if you look at the top of the bookshelves on the shed picture you might just make out a Harman Kardon SoundStick tweeter set; I picked up a pair from a junk shop a while back for £10 and I might lash them in at some point and see what they do ... but to be honest I don't really feel the need and also have some fairly urgent domestic paintwork to attend to ... (the balance is important)
The shop was a garage - only problem is it was built for very narrow cars. I had a mini for a while but if I drove it in there I could only just get out the car .... so now it just serves as a general dump for boxes in Winter and a place for me to tootle about in the Summer. Most of the time it looks like what we generally refer to in the UK as a 'shithole'