MCS2000 external speaker question

911-EMT · Post by **911-EMT** » Mon Mar 06, 2006 8:23 pm

Hi I am trying to hook up an external speaker on an MCS2000 type II via pin 1,2, on the accessory plug, to make it a dual speaker, it works but it takes away the audio of the initial speaker, is it something i missed in the manual or do I need to set it up in the RSS?

HLA · Post by **HLA** » Tue Mar 07, 2006 1:24 am

do you have them in series or parallel and are they matching?

Post by **wavetar** » Tue Mar 07, 2006 5:14 am

From the wording of your post, you are feeding the external speaker leads into pins 1 & 2? The external speaker actually uses pins 1 & 3, while the internal speaker uses a jumper between 1 & 2 to function.

What we have done in the past is left the jumper in place, spliced one of the external speaker leads onto it, and put the other external lead into pin 3. Worked just fine...if it took away from the internal speaker, we didn't really notice it.

Todd

jackhackett · Post by **jackhackett** » Tue Mar 07, 2006 6:22 am

wavetar wrote:From the wording of your post, you are feeding the external speaker leads into pins 1 & 2? The external speaker actually uses pins 1 & 3, while the internal speaker uses a jumper between 1 & 2 to function.

Putting the external speaker in 1 & 2 would put it in series with the internal speaker, which would make both speakers work, but the volume would be reduced, hooking it up in parallel as wavetar said would probably work better, although it's a little more work, what with the splicing and all.

911-EMT · Post by **911-EMT** » Tue Mar 07, 2006 6:34 am

Yes you’re right it was pin 1&3 and a jumper between 4&9, I wrote the post at home at night… but still on audio on the initial speaker.
HLA what do you mean by series or parallel? I did not change any ting, joust plugged in an external speaker in the accessory plug 1&3.

jackhackett · Post by **jackhackett** » Tue Mar 07, 2006 7:45 am

Here's a site that shows series and parallel connections

http://www.bcae1.com/srsparll.htm

The way the radio is wired, one output to the speaker is on pin 1, the other is on pin 3. The internal speaker is connected to pins 2 and 3. So to enable the internal speaker they use a jumper between pins 1 and 2.

If you want both the internal and external to work you can do one of two things.

A: Leave the jumper for the internal speaker in. Connect one lead of the external speaker to pin 3, and the other to the jumper. This would be a parallel connection.

B: take the jumper out and connect the external speaker to pins 1 and 2, basically replacing the jumper with the external speaker. This would be a series connection.

Normally we would use the first approach, I believe you get more volume that way.

911-EMT · Post by **911-EMT** » Tue Mar 07, 2006 10:04 am

Thanks to wavetar and jackhackett for the info. I have don chose A and it works great. FYI it did took away from the internal speaker that is a plus in my situation, as I asked in an otter post if we can lower the volume in the rss, wan the volume knob is all the way down its still like 3-4 compare to the spectra.