Having now got a pair of these AMT's to play with - i am stumped by knocking up a simple crossover. I have looked at a couple of crossovers posted on the web and have been bloody confused by them. I throught the AMT would be the easy to design a crossover for as its a pure resistive load, but looking at this example http://www.tangenavdesign.com/DUKE%20Delefilter.pdf No matter which calculator i use for the 4.9 ohm resistance of the driver i cannot replicate this. ( The other end was going to be for a PR170M0 which is 10 ohms @ 1200hz)
Anyone got any better ideas than just using a simple LR crossover using 4.9 ohms top end and 10 ohms bottom end - what am i missing?
It would make sense to do your own second order LR to start with. That xo seems to be for a particular bass setup as well, so you need to start from scratch.
Fuck the horns, I just listen to the Snells now.
I wasn't going to copy the xover completely i was just confused on why i cannot understand it. I was equally confused others excepting this http://www.audiodesignguide.com/HiEff/HiEff2.html which seems close to a butterworth @ 1200hz in some examples. I will start simple and see how it goes.
I thought i would make some bigger horns than the constant direction ones Beyma supply. Does anyone have a spreadsheet etc, that will allow me to determine the profile for a rectangular le cleach horn, for these AMT's. The ones i have got all assume a round throat, whereas i want one with a 26mm x 120mm throat.
I'm no expert, but didn't you get Scott's email when you where around at mine, theres a few on the wam have built his designs... he as as knowledgable any one I know.
user of old british valves from the 30's.
Maybe stupidly i was (hopeing) assuming i could get better vertical dispersion, and maybe alittle more bottom end. I also know that you should not mix horn profiles, so keeping all my horns with a JMLC profile. I am also considering making a dipole horn and taking the back off the unit.
the same goes for low end, you may get it smoother there but i doubt any extension.
Horn OK Please!