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Model Railroading > Replacing Athearn MRC decoders with Tsunamis

Date: 10/18/10 14:42
Replacing Athearn MRC decoders with Tsunamis
Author: slagg

A friend of mine has two older Athearn Genesis F-units with the MRC sound decoders. He's had lots of trouble with the decoders and has asked me to replace them with Tsunamis. I'm going to order a couple of TSU-1000 decoders with EMD 567 sound. My question is, are the speakers that came with the MRC decoders compatible with Tsunami decoders (i.e. correct impedance) or do I need to order some speakers, too?

Thanks,
Joel Slagg

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Date: 10/18/10 14:46
Re: Replacing Athearn MRC decoders with Tsunamis
Author: wildcat12

some of the MRC speaker are 32 Ohm, and the soundtraxx uses 8ohm.

I also need to replace the POS MRC decoder in my MP15AC which runs poorly.

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Date: 10/18/10 14:56
Re: Replacing Athearn MRC decoders with Tsunamis
Author: johneasterly

Get the 8 Ohm speakers, I used 1" Dia in my F Units from Athearn and hot glued the speaker in place where the MRC one was

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Date: 10/18/10 16:22
Re: Replacing Athearn MRC decoders with Tsunamis
Author: wabash2800

You can get Railmaster speakers at a reasonable price with acceptable ohms that will fit and they have a decent bass sound. I bought mine off ebay directly from Railmaster with free shipping. I am not sure if they still have that deal going.

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Date: 10/18/10 16:44
Re: Replacing Athearn MRC decoders with Tsunamis
Author: brfriedm

Open them up and look at the back of the speaker and check and see what the impedance rating is. The MRC factory jobs I have seen were 8 ohms. Also make sure you order GN-1000 Tsunami's as they are the Athearn drop in replacements and have the built in circuits for 1.5 volt bulbs. Good luck.

Bruce

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Date: 10/18/10 16:57
Re: Replacing Athearn MRC decoders with Tsunamis
Author: rdsexton

Definitely better to use 8 ohm speakers. If you decoder can put 1 Watt into an 8 ohm speaker, it will only be able to put 1/4 Watt into 32 ohm speaker.

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Date: 10/18/10 18:55
Re: Replacing Athearn MRC decoders with Tsunamis
Author: Arved

wildcat12 Wrote:
-------------------------------------------------------
> some of the MRC speaker are 32 Ohm, and the
> soundtraxx uses 8ohm.
>
> I also need to replace the POS MRC decoder in my
> MP15AC which runs poorly.

At least the MP15AC has an 8 ohm speaker (at least, mine is so marked).

- Arved

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Date: 10/18/10 19:01
Re: Replacing Athearn MRC decoders with Tsunamis
Author: UPJeff

I still have all my speakers up on EBay, or on my website.

Jeff Smith
Lakewood, CA
RailMaster Hobbies

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Date: 10/20/10 10:08
Re: Replacing Athearn MRC decoders with Tsunamis
Author: slagg

Thanks to everyone who responded for all the good suggestions. I'll order a couple of 8-ohm speakers and enclosures.

Joel

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Date: 10/20/10 13:47
Re: Replacing Athearn MRC decoders with Tsunamis
Author: spandfecerwin

Hi Bruce,

are you a dealer for this?

I´ve 3 sound F7, all with different decoders. I think it will not succeed mapping and speeding this for Multiple Traction.

Have a nice day
Erwin from Austria

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