Alfi wrote: ↑Tue Nov 26, 2019 7:16 pm
Well done Stu! Doc would be proud of you that's for sure
You have a top flight sense of humour and an insatiable appetite to tinker and fiddle with things.!
Yeah that HS2 worry must be terrible for you and all folk in and around its path.
Best wishes.
Alfi.
Very kind words Alfi , thank you.
It helps to have a sense of humour i find
Coming from a zero electronics background and working in industry a million miles away i had a lot to learn and i have found my journey so far to be immensely enjoyable and interesting. In a way i wish i had studied and gone in to the electronics industry but being a farmer's son you get a bit blinkered and drawn in to that way of life. Maybe i should study it (home study) but then i'd have bugger all time to ruin hifi
I don't think anything i am doing is cutting edge or new ground but it is to me which is why i can get a bit excited at times when i discover something which makes the music sound better. Everything i do is with a view regarding how Richard would have done it but sometimes with my own little twist. I know my limits (which are expanding) and i am fully aware of the holes in my knowledge. I am trying to fill them in
Many methods used by Richard are considered bad practice if you read diy forums. Maybe that is because the text books say it is wrong or people just believe what they have read or been told. In most cases these people have never actually tried doing it this way or their measurements said it was bad so they didn't even listen. The proof is in the listening
Drivers wired in series is a classic example of this as is doping a bass driver and throwing the low pass filter away. Semi omni gets attacked for involving the room and reflections too much but to many of us it works and much preferable to something with controlled directivity with horns, compression drivers and waveguides (the ultimate point & squirt).
Doc's power amp circuit sounds absolutely glorious to me. Post the circuit diagram up for scrutiny by "experts" and wait for it to be pulled apart. And ridiculed. I find it all a bit depressing as they have obviously never heard the results and dismiss it immediately because it sticks two fingers up at convention. I must say i get a bit tired of the way these "experts" or "gurus " try to make you feel like you are a second rate music lover and that your ears must be inferior.
Anyway, this tweeter breeding project has been well worth the effort so far. Even with them just blu tacked or screwed to the cabinet or pushed through a cardboard baffle extension the result is quite magnificent and worth the extra money it is going to cost me to buy another six Visaton G25ffl. I am looking forward to getting further improvements from having all the tweeters the same and properly mounted in the baffle to minimise diffraction.
I don't think you need to biamp to do this. All the tweeters in series and that in parallel with an 8 ohm mid bass will result in a load over 4 ohms for the amplifier. I have one amp on the mids and tweeters at the moment and the heat sink is not overly warm and not as hot as the other amp running two isobaric 12 inchers wired in parallel.
When i finish my third amp with nva boards then my tweeters will get an amplifier to themselves. It will be interesting to see how it copes with a 32 ohm load. With just one tweeter and padding resistor the load was 20 ohms to start with so only another 12
I have read that as the load goes up an amplifier has to swing more voltage rather than current and i suppose the amount of voltage it can swing depends on the psu rail voltage. If it sounds better with mid and tweets in parallel then i will stick with that.
Its pissing down all day here (again
) so i hope to do some more listening. My paper work has never been so up to date .
Didn't think i had anything but then i remembered an old pair of computer powered speakers which blew and i hadn't chucked them out 
Double craft thickness cardboard is the new "must have" baffle material then Stu? Seriously now though, glad to red and see you are having fun and learning much from the project! Almost as much as I'm having following your exploits.
