[CW] Tapping Out SOS

Richard Knoppow 1oldlens1 at ix.netcom.com
Mon Feb 22 03:49:25 EST 2021 

    These were the predecessors of the Altec A2 system. The T-350 
was an excellent tweeter and made a big difference. I also added 
them to some JBL horn systems using the 375 driver for mid range. 
The 375 was a permanent magnet version of the old Western 
Electric 594 which cut off pretty sharply at 8kc. For motion 
picture sound tracks it didn't matter much because there was 
nothing in them above that but for hi fi systems is made a huge 
difference.
    The A-4 was a good speaker with good stereo imaging. The RCA 
systems I had were about four times the size.
    I agree about the power. The extra headroom (or dynamic 
range) makes it cleaner. These theater systems were designed to 
be efficient at a time when amplifier power was very expensive.

On 2/21/2021 10:12 PM, D.J.J. Ring, Jr. wrote:
> I used to have a pair of Altec-Lansing A-4 speakers they had 15 
> inch soft felt cone type bass drivers crossed over at 500 Hz to 
> multi section horns for 500 to 3500 Hz and I added four 
> ElectroVoice ST-350A tweeters for 3500 Hz and up.
>
> They stood about five foot high each.
>
> I fed them with a Crown 300 amp, 150 watts each channel, it was 
> mostly for audio overhead as it was 117 dB loud at 3 feet with 
> 1 watt of audio power,
>
> 73
>
> DR
>
> On Mon, Feb 22, 2021, 12:39 AM Richard Knoppow 
> <1oldlens1 at ix.netcom.com <mailto:1oldlens1 at ix.netcom.com>> wrote:
>
>     Supposedly the reason M-G-M pushed to get a standardized
>     theater loudspeaker system was that the older systems would
>     not
>     reproduce Eleanore Powell's taps properly. I can believe it
>     because there were a variety of systems, all different and
>     often
>     with bad time delay effects. I think there were other
>     reasons for
>     the development but M-G-M liked to have some romance attached.
>     The standard system as developed was named after Douglas
>     Shearer,
>     the head of the M-G-M sound department and mainly developed by
>     Jim Lansing.  I had a pair of the RCA version but had to
>     sell it.
>     The system was probably inspired by a very large dual horn
>     built
>     by Bell Labs for its stereo experiments in the early 1930s. A
>     couple of these reportedly still exist. They are sometimes
>     called
>     Fletcher Horns after Harvey Fletcher, the head researcher in
>     acoustics at the Labs.
>         The Shearer system was cheaper to build and until the late
>     1940s was what you heard in most theaters. I miss mine and
>     wish I
>     had not had to sell them despite being very deaf these days.
>
>     On 2/21/2021 6:50 PM, Michael via CW wrote:
>     > Iambic
>     >
>     > Sent from my iPhone
>     >
>     >> On Feb 21, 2021, at 6:45 PM, D.J.J. Ring, Jr.
>     <n1ea at arrl.net <mailto:n1ea at arrl.net>>
>     >> wrote:
>     >>
>     >> 
>     >> Wadda you mean, she used both feet.
>     >> 73
>     >> DR
>     >>
>     >> On Sun, Feb 21, 2021 at 12:46 PM <sbjohnston at aol.com
>     <mailto:sbjohnston at aol.com>
>     >> <mailto:sbjohnston at aol.com <mailto:sbjohnston at aol.com>>>
>     wrote:
>     >>
>     >>
>     >>     QLF
>     >>
>     >>
>     >>
>     >>     Steve WD8DAS
>     >>
>     >> sbjohnston at aol.com <mailto:sbjohnston at aol.com>
>     <mailto:sbjohnston at aol.com <mailto:sbjohnston at aol.com>>
>     >> http://www.wd8das.net/ <http://www.wd8das.net/>
>     <http://www.wd8das.net/ <http://www.wd8das.net/>>
>     >>
>      --------------------------------------------------------------------
>     >>     Radio is your best entertainment value.
>     >>
>      --------------------------------------------------------------------
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>     -----Original Message-----
>     >>     From: D.J.J. Ring, Jr. <n1ea at arrl.net
>     <mailto:n1ea at arrl.net> <mailto:n1ea at arrl.net
>     <mailto:n1ea at arrl.net>>>
>     >>     To: CW Reflector <cw at mailman.qth.net
>     <mailto:cw at mailman.qth.net>
>     >>     <mailto:cw at mailman.qth.net <mailto:cw at mailman.qth.net>>>
>     >>     Sent: Fri, Feb 19, 2021 10:20 pm
>     >>     Subject: [CW] Tapping Out SOS
>     >>
>     >>     The amazing Eleanor Powell taps out an actual morse code
>     >>     in the movie Ship Ahoy (1942) while dancing to the music
>     >>     of Tommy Dorsey's orchestra.
>     >> https://youtu.be/jHHj09tVi9Q?t=66
>     <https://youtu.be/jHHj09tVi9Q?t=66>
>     >>     <https://youtu.be/jHHj09tVi9Q?t=66
>     <https://youtu.be/jHHj09tVi9Q?t=66>>
>     >>     73
>     >>     DR
>     >>
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>     -- 
>     Richard Knoppow
>     1oldlens1 at ix.netcom.com <mailto:1oldlens1 at ix.netcom.com>
>     WB6KBL
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

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