MTH 30-1170-1 Speaker

@Trainlover9943 posted:

I'm in need of a new speaker for this engine. It's a star with specs of 16 ohms and max of 2 watts. Which should I buy? I have the electronic parts up but I don't want to buy the wrong speaker.

Use this one Matt.

https://www.simplyspeakers.com...ull-range-f-801.html

Are you confident that this engine has the original Protosound 2.0 / 5 volt circuit boards in it?  If so, great.  If purchased used and this can't be verified, we'll need more information.

It looks like the available Star 16 ohm replacement option available through this MTH Parts Protosound 2.0/ 5-volt Steam search is the 50mm diameter.

Among the options available from MTH, this 3Watt speaker's increased power handling ability would be my choice.

Edit: I started this reply before Sid posted his.

Yes. It's a 5v.

I'm only going by the dimensions and electrical specs. provided. The one recommended by Sid has the same specs as the original. The 3 W replacement offered by MTH with 50% additional power handling capability may avoid future issues with possibly overdriving/ overheating the replacement speaker, assuming there are no issues with the audio amplifier.

As to whether the one recommended by Sid or the one sold by MTH parts would sound better, I don't know.  From a purely theoretical electrical perspective, either one should work.

@Sid's Trains do you have any recommendations about which sounds better?

@SteveH posted:

I'm only going by the dimensions and electrical specs. provided. The one recommended by Sid has the same specs as the original. The 3 W replacement offered by MTH with 50% additional power handling capability may avoid future issues with possibly overdriving/ overheating the replacement speaker, assuming there are no issues with the audio amplifier.

As to whether the one recommended by Sid or the one sold by MTH parts would sound better, I don't know.  From a purely theoretical electrical perspective, either one should work.

@Sid's Trains do you have any recommendations about which sounds better?

The one that I recommend is a very nice speaker. I have been using these for a long time now. Replaced over 50 speakers with these. The pack a lot of punch and get the job done well. They fit the same footprint, original specs, and overall design of the MTH speakers. They are also a little cheaper than the MTH ones.

Just ordered the speaker Sid recommended.

Hard to tell from picture, but what is the diameter in mm, and what is the height.  That looks like one of the flat speakers and if that matters because of clearance you need to get the right one.  G

George is right, it looks like that speaker isn't going to fit.  That looks like the speaker that's about 5-6mm tall.

The Simply Speakers F-801 is 2" (50mm) diameter and 3/4" (19mm) deep.  The MTH replacement BF0000033 is the same 50mm diameter and unspecified depth.  The perspective of the BF0000033 does make it difficult to judge its depth.

John and George, which one are you saying may be too deep to fit into the available space in the 30-1170-1?

To me it looks like that's one of the flat speakers that's only about 1/4" high.  Let's assume that the height isn't the issue and the picture is misleading.  The much larger magnet diameter of the F-801 looks to still be an issue, it would hit the board carrier.

So would this one sold by MTH be your recommendation for fitment and electrical compatabilites?

Here's the dimensions in mm. If the speaker I ordered won't work I've got other 5v engines, so I'll find a use for it.

Well, the height isn't an issue, but the diameter of the magnet is going to be a problem it looks like.

I have a version of that speaker in 16ohms.  G

@GGG posted:

I have a version of that speaker in 16ohms.  G

The speaker I need for this engine?

Yes.  What is wrong with speaker, those have been pretty reliable.  Granted any can fail.  It is a BF-0000007.  G

@GGG posted:

Yes.  What is wrong with speaker, those have been pretty reliable.  Granted any can fail.  It is a BF-0000007.  G

Right, I have a ton of those around from upgrades, I'm trying to think if I've seen one fail.

I'm not sure what happened. I was running the engine slow to bring it to a stop, all the sudden it just stopped making sound. Tried resets in command and conventional and no dice.

Try plugging in any good 16 ohm speaker and see if you have sounds.  Or use that speaker temporarily in another working engine.  If speaker good, either a bad wire somewhere or the audio amp on the 5V board.  Audio amp is a repairable fault on the 5V boards.  G

Just ordered the speaker you recommended George. I got the one that Sid recommended, I'll find a use for it.

So I got the speaker @GGG recommended. It doesn't fit either. The magnet is too wide. The magnet on the original speaker was around 22mm wide. Which speaker does MTH have or from a third party will work?

Sorry the other two speakers aren't working out for you.  The MTH parts site lists the BF0000033 as a suitable replacement for the MTH 30-1170-1; 0-6-0 steam switcher.  Please see my earlier replies about this for more details.

I have that speaker as well (I got it for another engine) it's a 16 ohm 3w speaker. I'm worried about blowing the board if I use it.

3 Watts is not how much power the speaker consumes.  3 watts is how much power it can handle before the speaker's voice coil melts.  The power the speaker uses from the audio amp is directly related to the 16 Ohm speaker impedance and amp's output voltage.

The audio amp's output power is limited by it's internal circuitry, so since the original speaker was rated for 2 watts, the 3 watt 16 Ohm speaker can handle the audio amp's output and will not cause it to draw more power.

If it fits, then it will work fine electrically.

@Trainlover9943 posted:

So I got the speaker @GGG recommended. It doesn't fit either. The magnet is too wide. The magnet on the original speaker was around 22mm wide. Which speaker does MTH have or from a third party will work?

I think that was mentioned some time back...

@gunrunnerjohn posted at 12/23/21, 8:57 AM:

Well, the height isn't an issue, but the diameter of the magnet is going to be a problem it looks like.

@SteveH posted:

3 Watts is not how much power the speaker consumes.  3 watts is how much power it can handle before the speaker's voice coil melts.  The power the speaker uses from the audio amp is directly related to the 16 Ohm speaker impedance and amp's output voltage.

The audio amp's output power is limited by it's internal circuitry, so since the original speaker was rated for 2 watts, the 3 watt 16 Ohm speaker can handle the audio amp's output and will not cause it to draw more power.

If it fits, then it will work fine electrically.

Alright. I'll give it a go.

Where did you get the speaker?  That is the Custiak, I think BF-0000031; only .25W.  The BF-33 probably will not work either from a magnet size, depending on which version you get.  MTH replaced it with a different form type when the original went obsolete.  I have the original replacement type you need.  G

@GGG posted:

Where did you get the speaker?  That is the Custiak, I think BF-0000031; only .25W.  The BF-33 probably will not work either from a magnet size, depending on which version you get.  MTH replaced it with a different form type when the original went obsolete.  I have the original replacement type you need.  G

I ordered the speaker direct from mth. Send me an email. I'll buy the one you have.

So, I checked the MTH part site and they don't have the correct speaker.  This is one of those case where they are providing a substitute that is not a direct replacement.  Same goes with the BF-34 versus the 43 4 ohm.  The form is different and the 34 now obsolete because of cost (big magnet) fit in some engines because of the low-profile outer diameter, and the BF-43 can't because it has a high outer diameter height.  Vice vesa also because the 43 small magnet can fit through some chassis holes, that the BF-34 doesn't.  Most application it doesn't matter.  But in some it does.  Will drop in mail today.  G