Bad speaker on MTH BL2

Is it 4 ohm or 16 ohm? Here is a post that may help. 

http://www.jcstudiosinc.com/BlogShowThread?id=621&categoryId=426

Also see this post. There is a link to an inexpensive 4 ohm one.

https://ogrforum.ogaugerr.com/d...ent/5512461176085120

Dale H

There was a issue with some proto sound 1 speakers, I had a C& BL2 with the issue. Here is a ebay link that tells about the problem.

http://reviews.ebay.com/MTH-Pr...id=10000000005991606

Gene,

There was a issue with some proto sound 1 speakers, I had a C& BL2 with the issue. Here is a ebay link that tells about the problem.

That's a well-known issue with the speakers in 5 volt PS2 engines, not PS1, as the article clearly states.

Also, there's no documentation that I've ever seen that would lead one to believe that any damage to the PS2 board would result due to the damaged speaker.

Sorry mine is a 2.0 but if a short would occur I don't know if it will fry the board they can be very touchy.

Gene,

The issue with the 5 volt board speakers is that they flake off their metal coating which winds up getting sucked into the speaker cone. This causes the speaker to sound staticky and to be at a lower volume.

I salvaged a speaker from a DOA Williams Tru Blast 2 horn which is 8 ohm 5w, would that work in the MTH Proto 2 with 9 Volt battery system replacing a 16 ohm 5w speaker without damaging the engine?

Gene,

I salvaged a speaker from a DOA Williams Tru Blast 2 horn which is 8 ohm 5w, would that work in the MTH Proto 2 with 9 Volt battery system replacing a 16 ohm 5w speaker without damaging the engine?

Unfortunately, an 8 ohm speaker could potentially damage the audio amp on the 5 volt PS2 board. You should only use a speaker that's rated 16 ohms or higher. Anything higher will lower the maximum volume. Anything lower can damage the audio amp.

Hi guys,

There's no danger of a short circuit that could damage a PS2 board. What you saw was pure fiction, stated by someone who heard it from someone else.

Unfortunately, the e-bay comment is correct, there is a danger of a degrading speaker causing a short.  It's a known problem that is covered in the MTH technician training course.  When the chrome flakes off the magnet it will occasionally find the speaker power leads placing a dead short across the speaker circuit.  This takes out the audio amplifier pretty quick.  Fortunately, the audio amp is a relatively easy component to replace, so the board can often be repaired.  The amps are available to authorized service centers.

I salvaged a speaker from a DOA Williams Tru Blast 2 horn which is 8 ohm 5w, would that work in the MTH Proto 2 with 9 Volt battery system replacing a 16 ohm 5w speaker without damaging the engine?

No.  An 8Ω speaker will also damage the audio amp.  You can safely replace a speaker with a higher ohm value speaker, but lower ohm will try to draw too much current.  If you had room for two speakers you could use two 8Ω speakers in series.  The two together would equal 16Ω total.

If you're willing to accept slightly lower audio volume, you can also series a resistor with the 8 ohm speaker.  Sometimes there isn't room for two speakers.