In the sixties, I bought my first wide range stereo speaker system, two "sand filled baffle" four way Wharfdale 70 E speakers.
http://www.google.com/imgres?imgurl=http://stereo.toups.info/Wharfedale/Full%2520Size/07%2520W70D.jpg&imgrefurl=http://stereo.toups.info/Wharfedale/index.html&h=1696&w=1472&sz=804&tbnid=e83GFJvexqPhpM:&tbnh=85&tbnw=74&prev=/search%3Fq%3Dwharfedale%2Bw70%26tbm%3Disch%26tbo%3Du&zoom=1&q=wharfedale+w70&usg=__K2GntzAkyNY6oKtpCe0qk6JyaZs=&docid=X11K6W7dshvIcM&hl=en&sa=X&ei=iToVUf_0M6HB2wW9nYHACg&sqi=2&ved=0CDUQ9QEwAg&dur=2427
They had the sweetest high end sound, although the low end was typically British, "conservative". Nonetheless, they served me well until one of the them blew a tweeter when my brother and I used them as playback monitors during a 1962 recording session in a church in North Hollywood of the Jack Halloran Singers (I was a member). They were very comfortable to listen to.
--- On Fri, 2/8/13, Don Cox <[log in to unmask]> wrote:
From: Don Cox <[log in to unmask]>
Subject: Re: [ARSCLIST] Passive radiator loudspeaker was Mono but Out-of-Phase
To: [log in to unmask]
Date: Friday, February 8, 2013, 4:04 AM
On 08/02/2013, L. Hunter Kevil wrote:
> Pace Don Cox, electrostatic speakers, by Quad or any other
> manufacturer, are definitely NOT infinite baffle designs. They are
> planar speakers, completely different from the conventional cone and
> voice-coil drivers used in box speakers. Magneplanar speakers, while
> not electrostatics, are well known American-made planars. Planars
> don't even look anything like infinite baffles.
>
I do know how electrostatic speakers work. I've used them for decades.
A baffle is a large board on which a speaker drive can be mounted, so
that out-of-phase sound from the back doesn't wander round to the front
and interfere with the direct sound.
Ideally, the board is infinite in area. As said, it could be (as a
compromise) a wall between two rooms.
In practice, a board a few feet square gives useful results, as the
Wharfedale design showed.
Some people think that a closed box full of wool or similar material can
give the same result as an infinite baffle, and they market such boxes
as "infinite baffle" designs. I think this is a misnomer.
Picture of the Wharfedale design here:
http://www.hi-fiworld.co.uk/loudspeakers/68-technology/139-designing-loudspeakers-part-20-open-baffle-room-responses.html
http://tinyurl.com/atm6ver
Regards
--
Don Cox
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