[Jukebox-list] Seeburg Teardrop RS1-8 Speaker Hookup

[Edward Hink]

Dave

Thanks very much for confirming my limited knowledge. I'll let all know how
it sounds when I get it hooked up.

Additional question for all:

The speaker was originally ivory color but had a poor paint job in a hideous
green (not Seeburg).  The speaker grill cloths appear original and in
excellent shape, however have darkened with age and lots of smoke and
nicotine, can I somehow clean the cloth? Best way?  If not, what would be
the most original cloth to use if I plan to repaint the body of the speaker
the turquoise available for the C from Victory Glass, which I assume is
close to the original mech cover on the C? To me, the mech cover is more a
blue than turquoise? The cloth (under the chrome trim) is a darker gold
color with a  vertical pattern.  Any thoughts?

Thanks again

Ed Hink
Bellevue, Nebraska


On 6/16/07 8:37 PM, "David Breneman" <david_breneman at yahoo.com> wrote:

> 
> --- Edward Hink <hink4 at cox.net> wrote:
> 
>> The service manual appears to say I do not need an additional
>> amplifier and
>> to wire it from either the "C" & "1" or the "C" & "4"  terminals
>> on the
>> terminal board to the  "1" & "2" terminals on the speaker.
> 
> 1 and 2 are the 70v connection points, and 4 and 5 are the 8 ohm
> connection points on the speaker.  C and 1, and C and 4 are the
> 1 and 4 watt output terminals on the amp, so yes, you're
> reading it right.
> 
>> Should I remove the jumper wire between terminals 3 & 4 on the
>> speaker?
> 
> According to the wiring diagram, that jumper connects one
> line of the voice coil to the 70v stepdown xfmr in the speaker
> enclosure, so if you are using it as an 8 ohm speaker, which
> you *can't* do with this machine, yes. You're going to be using
> it as a 70v speaker, so no.
> 
>> What gauge wire should I use for about a 6 ft speaker run?
> 
> Just regular 18 ga zip cord, like you'd wire a table lamp with.
> Or, $5000 Monster Cables if you're an idiot.  :-)
> 
>> The manual says while the older Type RS speakers may be used on the
>> 100C the
>> Type RS are recommended because of their volume control and
>> WARNING: NEVER
>> connect 8 ohm speakers directly to the terminal board of the
>> amplifier!  I
>> assume it is referring to the Type CV speakers and not to the Type
>> RS?
> 
> Looking at the manual pages I have, all RS series speakers
> can be wired 70v (which they also refer to as 500 ohm) or
> 8 ohm.  Make sure you're not mixing up the two types of
> circuit in your mind.  70 volts will probably blow out a
> transformerless 8 ohm speaker, ergo the warning.  The
> amplifier in the M100-C does *not* have an 8 ohm remote
> speaker output.  The Symphonolas, which were the machines
> produced when these speakers first came out, do.  The CV
> series speakers have taps on their xfmrs which are selected
> with jumper wires, and which determine how many watts each
> speaker draws.  The RS speakers can draw either 1 or 4
> watts, depending on which terminals (C with 1 or 4) they're
> connected to on the amplifier.  That's why there's two
> type of connection - the CV terminals are relying on each
> speaker to "tell" the machine how much power to send it
> (via which xfmr tap is selected on the speaker).  With
> the RS speakers, the machine "tells" the speaker how much
> power it's going to get based on whether it's connected to
> the 1 or 4 terminal on the amp.
> 
>> Do I set the select-o-matic speaker switch to what sounds best?
> 
> This switch controls the volume of the phonograph relative
> to the remote speakers.  This gets into the whole issue of
> how many watts the amp puts out vs how many watts the
> speakers are drawing.  If the total wattage of the speakers
> exceeds the output of the amp, it can damage the amp.  25
> is the max, so add the number on the speaker switch, which
> is how many watts the internal speaker will draw, to the
> total of all remote speakers (you'll have one set at 4 watts,
> I assume) and make sure the total is less than 25.
> 16 + 4 = 18, so you're safe with that switch set all the
> way up at 16, or you can set it lower if you want the remote
> speaker louder relative to the phonograph (but the total
> volume will be lower, too).
> 
>> What Ohm do I set the selection speaker switch to?  8 ohm? From the
>> 16 ohm I'm running the main speaker on?
> 
> You're confusing ohms with watts.  If you're talking about the
> switch above, that's watts not ohms.  Ohms really don't
> enter into it when you're talking about 70v systems, except
> that the engineer that designed the speaker needs to make
> sure the impedance of the speaker matches the output of the
> transformer in the speaker cabinet.  That's not our problem.
> Just put ohms out of your mind - that's home stereo stuff.
> We're talking a commercial sound system here, and the
> way of doing things is different for a whole host of reasons
> we have better things to do on a Saturday evening than go
> into the theoretical stuff over.
> 
> 
> 
> David Breneman         david_breneman at yahoo.com
> 
> 
>  
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