[rollei_list] Re: Completely OT- Loudspeaker info
- From: Akhil Lal <alal@xxxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 16 Feb 2005 12:16:00 -0500 (EST)
On Wed, 16 Feb 2005, Richard Knoppow wrote
The purpose of damping is to control unwanted modes in the ribbon element,
not to alter the LF response.
Dipoles can be made more directional in the MF & LF. They are intended to
put *less* energy into the reverberant field than conventional speakers.
> > -----Original Message----- > From: "A. Lal" <alal@xxxxxxxxxxxxx> >
Sent: Feb 15, 2005 10:18 PM > To: rollei_list@xxxxxxxxxxxxx > Subject:
[rollei_list] Re: Completely OT- Loudspeaker info > > > Jerry, a bare
ribbon would in fact behave like a dipole. However, in > many designs
material is put on othe back side to try to damp out > resonances. > >
There have been ribbon speakers that used an impedance tube at the back of
the ribbon similar to the method used by RCA for directional microphones.
For a ribbon speaker an absorptive box probably would do. The path length
around the ribbon structure is what controlls the minimum frequency it can
radiate with any efficiency. This is different from damping of resonances.
What is needed if both sides of the speaker are to be open to the air is a
large enough baffle so that the path around it is longer than a half wave
at the minimum frequency of interest. > It seems to me that what the
"dipole" speaker people are doing is an old trick of exciting the
reverberant field with the back radiation. > > > > -- > Richard Knoppow >
dickburk@xxxxxxxxxxxxx > Los Angeles, CA, USA > >
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