There's a big difference between the Hill Plasma type of
speaker and the "Ionovac/Ionophone" horn loaded style of
"plasma" speaker.
The former used a large gas plasma that was directly
modulated by AF at high voltage.
The latter uses an RF signal to generate a very tiny (and
hot) plasma which is indirectly modulated by AF high
at high voltage.
Both are similar in terms of needing a plasma, but the
latter case must deal with the effects of horn loading,
and limited LF response.
Both have some background hiss from the plasma itself.
The Hill had the single most impressive mids and highs
that I can recall - fantastically coherent and dimensional.
Their bass was less wonderful. The Hill used "Argon"
welding gas to create the plasma, so it "leaked" into
the room (presumably on the floor, as it is heavier than
air), so they are safe with an exhaust route for the remaining
gas to get out of the room.
Neither make excessive amounts of Ozone. There's more ozone in the air in any major city than these are likely to produce in your listening room.
Magnat made a pure plasma tweeter many years ago, it was an
omni from what I understand - never heard one.
I did an on paper design of a wide range omni, direct radiator
plasma driver some years back...I think it would work.
I don't know about the Acappela tweets, anyone got a URL?
Are they horn loaded??
_-_-bear
speaker and the "Ionovac/Ionophone" horn loaded style of
"plasma" speaker.
The former used a large gas plasma that was directly
modulated by AF at high voltage.
The latter uses an RF signal to generate a very tiny (and
hot) plasma which is indirectly modulated by AF high
at high voltage.
Both are similar in terms of needing a plasma, but the
latter case must deal with the effects of horn loading,
and limited LF response.
Both have some background hiss from the plasma itself.
The Hill had the single most impressive mids and highs
that I can recall - fantastically coherent and dimensional.
Their bass was less wonderful. The Hill used "Argon"
welding gas to create the plasma, so it "leaked" into
the room (presumably on the floor, as it is heavier than
air), so they are safe with an exhaust route for the remaining
gas to get out of the room.
Neither make excessive amounts of Ozone. There's more ozone in the air in any major city than these are likely to produce in your listening room.
Magnat made a pure plasma tweeter many years ago, it was an
omni from what I understand - never heard one.
I did an on paper design of a wide range omni, direct radiator
plasma driver some years back...I think it would work.
I don't know about the Acappela tweets, anyone got a URL?
Are they horn loaded??
_-_-bear