[rollei_list] Re: Completely OT- Loudspeaker info a pop up question
- From: "Ruben" <ruben@xxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 16 Feb 2005 13:16:42 +0100
I see that you are talking loudspeakers and I have a couple of questions
1. On an amplifier it is often statet to use only 8 ohm speakers - I I have
a speaker unit and it mesures 8 ohm when an Ohm meter is attached to the + -
I guess it is ok - but what if there are more thant one speaker ? or my
speaker set is only 4 Ohm - can you just put a resitant 4 ohm on the wire
and everything is cool ???
2. I have several boxes with speaker units, from jbl, cervin vega, pearless,
b&o, kef and b&w - I would like to built new cabinets and could use a guide
to both "spliting filters" - cabinet acoustics etc. Can you recommend books
on do it your self high end speakers ??
thanks and sorry for jumping into your thread
Ruben
----- Original Message -----
From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Wednesday, February 16, 2005 12:30 PM
Subject: [rollei_list] Re: Completely OT- Loudspeaker info
>
>
> -----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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