[rollei_list] Re: Completely OT- Loudspeaker info a pop up question

  • From: John Jensen <jwjensen356@xxxxxxxxxxxxx>
  • To: rollei_list@xxxxxxxxxxxxx
  • Date: Thu, 17 Feb 2005 15:36:38 -0800 (PST)

Yes, his was an A-7.  But two in a smallish living
room would have been just too much.  He then built two
Bozak speaker systems with two 15" woofers in each
(plus the midrange and tweeter array).  All Bozak
speakers of course.  At least his wife could put
something on top of the cabinets.

John

--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:

> 
> ----- Original Message ----- 
> From: "John Jensen" <jwjensen356@xxxxxxxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Thursday, February 17, 2005 11:28 AM
> Subject: [rollei_list] Re: Completely OT-
> Loudspeaker info a 
> pop up question
> 
> 
> >A friend of mine had a Voice of the Theater system,
> > the industrial grey model.  A momster corner horn
> > assembly.  When stereo records came out he chose
> to
> > get rid of it, he was not about to have two of
> them in
> > his living room.
> >
> > JJ
>    The smallest of the Voice of the Theater, the A-7
> was a 
> reasonable size for home use but the ones used in
> movie 
> theaters were monsters. Most theaters used the A-4
> or 
> multiples of it. This is a box about 7 feet high and
> about 3 
> feet wide and three feet deep. A very large theater
> migh 
> have four of these (A-1) sytem with one or more
> large 
> multi-cell high frequency horns on top. Other
> manufacturers 
> made similar systems but Altec was probably the most
> often 
> found.
>    Actually, I have two ancient (c.1937) RCA theater
> 
> speakers in storage. These are the same size as the
> Altec 
> A-4, designed to just fit through a standard door.
>    The large Altec system had some problems not
> least of 
> which was mechanical integrity after a time. This
> could 
> cause resonances from loose panels, etc.
>    One problem with theater sound systems until
> fairly 
> recently was that many of them were ancient and
> often 
> broken. I know of theaters who had torn cones in
> their 
> systems for years. They just didn't want to spend
> the money 
> to fix them.
>    Modern theater speakers are built on a differnt 
> philosophy than the old ones. They must reproduce a
> wider 
> range of frequencies and efficiency is not so
> important as 
> it was when amplifier power was very expensive.
>    Standard optical sound tracks up to the 1950s
> were cut 
> off at 50 and 8000 hz (Western Electric or Westrex)
> and 60 
> and 6000 (RCA). Most theater reproducers were cut
> off at the 
> low end to avoid thumping from the optical noise
> reduction 
> system then in use. Nonetheless, some of these old
> tracks 
> sound remarkably good.
> 
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>  
> 
> 
> 


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