I just bought tweeters that were salvaged from ESS PS-920 Brilliance tower speakers. I need to build high-pass filters for them. Does anyone know their impedance, or whether all ESS tweeters have the same impedance?
I use a pair of Heil AMT´s have had them since late seventies i think, first model, some claim that the original diaphragm is better than new ones, i don´t know newer had to replace them. They are , i think, among the best hf units obtainable if bipolar work in your room. There has arrived, just a coupple of months ago, a new alternative, only front radiating thou, possible to modify for bipolar use with care. I´ve used theese since november, switching back and fort between Heill´, woodhorn with different drivers and the TPL150 and have become partial to the latter.
It also has the advantage of higher sensitivity and can be x/0´d lower than the Heill.
They are 6 ohms entirely perfectly resistive flat up to 23kHz with a small resonance @ 500hZ. At least monopolar. Idon't know about Big Bipolar from AMT's but principle is the same (bigger whitout dumping the back side)
It is better don't use it below 1kHz