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

[David Breneman]

--- 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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