AMTs are fairly common nowadays but also diverse, it's difficult to generalise. Some can go down quite low. I have never lived with one ; I know a couple of people who don't rate them as a substitute for a compression driver or ribbon, though.Scottmoose wrote: ↑Tue Mar 09, 2021 12:26 pm AMTs and ribbons I tend to be a bit wary about. I like good ones, but with a handful of exceptions smaller examples tend to have poor distortion performance at the bottom end, requiring a highish XO frequency and higher order slopes. Coupled with the limited vertical dispersion ribbon types tend to have, that can sometimes make for questionable system polars, which in turn can affect tonal presentation. Good ones though as noted -great. I do rate the big Beymas for instance.
As far as ribbons, I suggest they need either a higher crossover, or a steep slope - not both. I use the Aurum G3's with a transitional 1st/2nd order slope but somewhere around 3 to 3.5kHz, and I haven't heard anything better, driven by the 45 amp.
These concerns about the polar pattern, well, maybe my ears are 'blind' to what that does to the sound. I have a few gripes with the OB set-up I have now, but the treble is the one bit i wan't be changing, it's spacious , natural, detailed, dynamic , colourful .... or maybe I'm just biased ...
Maybe Nick, Ali or SimonC could correct me ( go ahead ) .