Seeburg Teardrop Speakers

[steveb]

What Ohm speaker (4 or 8) was used in the following original Seeburg Teardrop Speakers:
RS1-8
RS2-8
CVWS1-8
CVWS2-8
CVS4-8

Could any one of the above original speakers be used with a Seeburg C or R?

[Ron Rich]

Steve,
Far as I know--all had 8 ohm speakers--instructions on speaker's back. Ron Rich

[robnyc]

Jun 17, 2018 14:52:51 GMT steveb said:

What Ohm speaker (4 or 8) was used in the following original Seeburg Teardrop Speakers:
RS1-8
RS2-8
CVWS1-8
CVWS2-8
CVS4-8

Could any one of the above original speakers be used with a Seeburg C or R?

There are two questions there: first, do you want to connect through a transformer or directly to the low impedance terminal.  From my observation the late 1940's-50's Seeburg speakers used 4 ohm voice coils at least on their 8" external speakers. That means the external will consume twice the power as the machine's internal speaker load of 8 ohms.

On the MRA-5 schematic it shows the low impedance terminal connected to the wattage tap that is one step down from highest. Since those tap ratings are based on an 8 ohm load, connecting 4 ohms to it will overload the amp. You can connect to one of the lower taps under the chassis, or use a transformer. With a 4 ohm speaker the gauge and length of speaker wire becomes a factor.

If the wire has a loop resistance of say 2 ohms then half the power will be wasted in it. That amounts to 3 db.

A typical 70v tran has an insertion loss of about 1 db.

In most of my commercial installations, I use transformers.

RobNYC

[steveb]

I have two different teardrop speakers with original but damaged speak cones. The voice coil from the RS1-8 measures 3.6 ohms. The voice coil from the CVS4-8 measures 6.5 ohms. Both have transformers attached to the speaker frames. I believe the earlier RS1-8 was specifically made for the Trashcan and is suppose to connect directly to the amp speaker tap. The later CVS4-8 is for a 70v constant voltage setup.

My concern is what robNYC has pointed out about a 4 Ohm speaker drawing too much current and overloading the amp. These teardrop speakers will be used with a Seeburg C or R. Since I have to replace the speakers I wanted to know if they should be 4 ohm (as the RS1-8 may be) or 8 ohm. Would there be a problem if both were replaced with 8 ohm speakers and used in a C or R?

Thanks

[Ron Rich]

Steve,
See the instructions in your Service Manual-- in the amplifier section.
(A "16" ohm speaker will measure about 12-13 ohms, with a meter, "8 ohm" speaker will measure about 6-7 ohms with a meter --a 4 ohm will measure 3-4 ohms, using a meter--Using an ohm meter to measure impedance, is not very accurate--depending on type/quality of meter) Ron Rich

[robnyc]

Jun 18, 2018 14:39:48 GMT steveb said:

I have two different teardrop speakers with original but damaged speak cones. The voice coil from the RS1-8 measures 3.6 ohms. The voice coil from the CVS4-8 measures 6.5 ohms. Both have transformers attached to the speaker frames. I believe the earlier RS1-8 was specifically made for the Trashcan and is suppose to connect directly to the amp speaker tap. The later CVS4-8 is for a 70v constant voltage setup.

My concern is what robNYC has pointed out about a 4 Ohm speaker drawing too much current and overloading the amp. These teardrop speakers will be used with a Seeburg C or R. Since I have to replace the speakers I wanted to know if they should be 4 ohm (as the RS1-8 may be) or 8 ohm. Would there be a problem if both were replaced with 8 ohm speakers and used in a C or R?

Thanks

Steve, if you are going to connect directly to the amp low terminals you can use an 8 ohm speaker in either. Leave the tran disconnected. I suggest getting a PA type speaker with good efficiency (92 db@1 watt or more) and a cone with paper surround  -not foam. A whizzer cone will add some highs and is pretty typical in this type.

Have you considered a recone? This will probably cost a bit more, but you'll keep the Alnico magnet and retain the efficiency.

Whether connecting directly or through a transformer, you need to balance the load so that it doesn't exceed the amp's total wattage. Since the amp is rated at 25 w into 8 ohms, adding an external 8 ohm load means that you should lower the phono wattage by half  -though I forget what the phono switch has a a maximum tap.

As I mentioned before, you can change the low impedance tap connection under the chassis if lower level is desired in the external spk.

RobNYC

[steveb]

Hi Rob, thanks for the information.
Since the teardrop speaker will be in a room several feet away from the jukebox I was planning on using the transformer and 70 volts.
I did consider a recone in order to keep the AlNiCo but I don't know where to send the speaker.  I'm in northern NJ. Any suggestions? If I do replace the speaker I will use 8 ohm as you suggest.

[Ron Rich]

Steve,
One company is listed in our FAQ's section, and one I know of, but never used, is in NJ. Their contact info I have is old, but maybe they are still there --? Let us know, by adding them to our FAQ's --Please-- www.soundremedyNJ.com email: [e-mail] Ron Rich

[steveb]

Hi Ron,
He is still in business. Same website and email.

[Ron Rich]

Steve,
Thanks--I added his info to our FAQ's list--
Ron Rich