Motorola amplified speaker - Can you help identify? - Photos included

[access8529]

Good Day All

I'm an occasional visitor to the site and first time poster. I'm looking for assistance in positively identifying a Motorola product. It will surely be obvious to you radio folks, but it's a mystery to me. (I'm more familiar with live audio associated with music performance and recording.) My goal is to adapt the item for my own use, but at the moment, all I'm looking for is model/product info so I can look up the spec sheets.

What I have is an old Motorola amplified speaker that likely came out of an emergency vehicle. My guess on the manufacture date is late 70's to early 80's. The size is approx 5"x5"x4" and the case and bezel are metal. There is a blank white tape on the back that in an earlier day likely showed the model number. Trailing out of the case is a two conductor zip cord, a small gage red lead and a small gage black lead. Inside there are two transformers along with additional parts, see the links for pictures.

If you have info on this item, I'd sure like to hear from you. Also, if you have adapted a Motorola speaker like this one, tell me how it's working for you.

Thanks in advance.

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More photos:
http://www.phosphorphoto.com/projects/projects2010/moto/moton48051.jpg
http://www.phosphorphoto.com/projects/projects2010/moto/moton48052.jpg
http://www.phosphorphoto.com/projects/projects2010/moto/moton48053.jpg
http://www.phosphorphoto.com/projects/projects2010/moto/moton48054.jpg
http://www.phosphorphoto.com/projects/projects2010/moto/moton48055.jpg
http://www.phosphorphoto.com/projects/projects2010/moto/moton48056.jpg

 

[cmdrwill]

That is the second gen/ver Power Voice Speaker.

The red and black leads are power 12 volts, the zip cord is speaker input from the radio's speaker amp.

Double check the input leads, I remember they are not referenced to ground, but transformer input.

 

[Luis_R]

Model # TSN6015A

Produces 15 watts of audio, with 1 watt input, Input transformer taps for 1.9V or 4.5V max 1000cps input signal, powered by 13.8 VDC.

 

[jackj]

Yep, this is a power amp for a 2-way radio. The unit produced a LOT of audio and was almost standard equipment in fire trucks and other heavy equipment vehicles. It required a high level input of around 1 watt to produce it's rated output power so it wouldn't work as a mic or tape-deck amp. The frequency response was tailored to the voice range.

 

[access8529]

Thanks!

All,

That's exactly the info I needed, especially the model number and power data.

My intended use is as a monitor speaker for talk back. (Intercom) Audio will be coming from a mixer to a low power single channel stand alone amplifier (20 watts) and a long run of 12ga two conductor wire (150 ft).

I'll likely just bypass the Motorola's internal transformers and connect to the speaker directly. (I have a strong line level signal I could run out of the mixer to the speaker, but this is in a theatre with no convenient source of 12 VDC power.)

Thanks again for the assistance.

 

[access8529]

Continued

While I'm thinking about it, let me ask a follow up question.

I'm using this old Motorola speaker because . . .
- It's likely to give the strong voice only output necessary (5 to 10 people at 20 ft listening distance)
- It can take the rough and tumble use it's likely to see back stage in a theatre
- It can be fitted with a Neutrik Speakon D series fitting for quick hook-up and disconnect

Here is the question: Is there a Motorola external speaker better suited for this purpose? I don't need the amplification circuit. Durability and clear voice only audio are key.

Thanks

 

[W2NJS]

To use the speaker correctly, you might want to set it up the way Motorola does. That means you feed it with line level audio and to vary the output level you vary the line level input. "Bypassing transformers" is not accurate, because you are, I believe, thinking of bypassing the entire internal amplifier.

 

[Luis_R]

Durability and clear voice only audio are key.

Thanks

Can't get much durable ( in terms of speaker housings ) than this speaker, as far as Moto goes. As for clarity, that depends on how clean the signal is going into the speaker.

 

[jackj]

If you don't need the amp portion then why not just put up a trumpet speaker.

I don't know if you really mean "line level" or not. Line level is 1v peak-to-peak max, I think you are talking about 8/16 ohm audio and, as long as the wire length isn't too long, you should be able to drive a speaker direct from the feed line.

 

[cmdrwill]

Trade your Power Voice speaker for the standard Motrac/Mocom 70 speaker.

 

[access8529]

Thanks everyone for the info.

 

[DJnRF]

I know this thread is almost a year behind, but, everyone is correct that this
is the TSN6015 Power Voice Speaker from Motorola. What isn't mentioned
is that there was also a model TSN6002 version. The only major difference
between the two is that the 6015 was a weatherproof design in black, and
the 6002 was not weatherproof, and was in the typical tan/ dark gray color
of the typical Motorola control heads. The 6002 unit was used mainly in
squad cars as they didn't need the weatherproof design. Other vehicles
that were in loud noise conditions, but not exposing the speaker to the
outside weather conditions could also use this speaker. However, since
there was very, very little difference between the two, many people and
agencies weatherproofed their own speakers since all it took was some
good plastic sheeting, and glue inside the housing. Some of these units
also had a volume control mounted on the case.

These speakers are one of the most durable one can get. They were
made quite well, but very simple. I still use my various Motorola speakers
from over the years. There are none finer in my opinion. The new plastic
does nothing to preserve the image of 'the best'.

If needed, I do have a pdf copy of the original Motorola manual w/ the
schematic and parts list. That file is too large an attachment here, but
you can contact me for a copy via email.

 

[access8529]

DJnRF,

I tried to send you a private message with my email address, but the forum did not permit. Maybe you're a new user and not all functions are active yet. If you could, send me a private message and I'll reply back.

Sure appreciate your post, the info and your offer of the schematics. Would like to take you up on that.

Access

 

[DJnRF]

DJnRF,

I tried to send you a private message with my email address, but the forum did not permit. Maybe you're a new user and not all functions are active yet. If you could, send me a private message and I'll reply back.

Sure appreciate your post, the info and your offer of the schematics. Would like to take you up on that.

Access

Hi, Access,

Yes, I am new to this forum. I could not find any way to send a PM to you either. It seems odd that way.
None of the other forums to which I belong are restrictive on that. They just rely on the members to file
a complaint if a PM is out of hand. For me just use my nic in here along with @ yahoo.com for email.
That would be the way.

Dave.
DJnRF@yahoo.com

 

[WayneH]

Yes, I am new to this forum. I could not find any way to send a PM to you either. It seems odd that way.

All new members must first make it past four approved posts. This keeps out the spammers and troublemakers. We had issues with spammers creating accounts and spamming via PM.

I manually bumped you up so you can PM now.

 

[cmdrwill]

The input transformer matches a 4 ohm audio output from the mobile radio to the bases of the push-pull amp using two transistors and a output transformer to the speaker.

Some of the newer amplified speakers in the plastic housing from Motorola use one or two op amps driving a 2 ohm speaker in them. They have a higher impedance input into a trim pot shunted by a fixed resistor. Clip out the fixed resister and you have a true line level input greater than 1000 ohms.