There are various Apogee ribbons. Not sure but I think the ones of the Diva is more like 3-4 Ohm.
The Magnepan tweeter in the 3.6 etc is described as a pure ribbon. (Most people define that to mean pure alu foil and only attached at the top and bottom). Some Apogees (Scintillas and the Full Range from memory) have such pure ribbon tweeters but their impedance (when unaltered by resistors) is less than 0.5 ohm. That is what is puzzling me.
The low resistance is a result of a thicker and wider piece of aluminium. Magenpan's ribbon is very thin and narrow compared to the ones you refer to.
He requested the fellas delete his account and they obliged. He's gone.
Somebody must have pissed him off. Or he'd just had his fill of the trolls here.
I'm surprised there aren't more members doing this actually.
Dave.
Somebody must have pissed him off. Or he'd just had his fill of the trolls here.
I'm surprised there aren't more members doing this actually.
Dave.
Sad. I was hoping he'd release his measurements of the 1.6 and 1.7. This is (was) one heck of a thread with so many Maggies. In all of these years, I can only recall one other thread on the Internet where someone was running seven Maggies in a HT. But Sig was doing measurements!
I do ignore two "members" that decided to attack me personally on a thread. Oh well. Out of sight, out of mind.
I do ignore two "members" that decided to attack me personally on a thread. Oh well. Out of sight, out of mind.
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Magnepan pure ribbon is very long and must be supported every 10-30 cm. Anyone verified if that is true?
Yes it is visible on picture. Very strange why only one side. Not logical. Also looking like ribbon is not in the middle of magnet but at the corner. Whats are vertical strips?
The first generation had an extremely thin foil, about 2.5 µm. It was 1/4" wide and a resistance of 3 Ohm. It easily brook and was replaced by a thicker one with a resistance of 2 Ohm, about 4 µm thick. You had to add a resistor of 1 Ohm. The later generation of the ribbon is narrower and the magnets are thicker. Also 3 Ohm.
Thanks. Is that a guess based on the fact that the combined sensitivity of a 3.6 or 3.7 Maggie is a similar figure?
It is a guess as there are nothing reducing the level to the tweeters, only if you are using series resistors. Magnepan's figure of sensitivity is very optimistic.