I have a 30-1215-1 0-6-0 RailKing engine. The sound is becoming distorted. I am going to trouble-shoot by replacing the speaker. The print is not visible. I see a number that looks like a 6. But I really can't tell. I heard most Proto 2 engines have 8 ohm speakers. Am I right.
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If this has the 8.4V battery it is a PS-2 5V system and uses a 16 ohm speaker. If this is a PS-2 3V with the 2.4V AA it takes an 4 ohm.
LocoSounds and the original PS-1 take 8 ohm.
I have the speakers in stock if you need one. E-mail in profile. G
Speakers have a way of picking ferrous metal debris from the track. A pretty good sized magnet. Sometime the debris distorts the sound.
If this has the 8.4V battery it is a PS-2 5V system and uses a 16 ohm speaker. If this is a PS-2 3V with the 2.4V AA it takes an 4 ohm.
LocoSounds and the original PS-1 take 8 ohm.
I have the speakers in stock if you need one. E-mail in profile. G
GGG: Read a recent O Scale Trains article re MTH F-7 ABBA modifications, where author plans to replace the single 4 ohm speaker in the lead unit with an MTH 16 ohm speaker in each of the four units, in parallel, netting overall 4 ohm impedance if his theory is correct. Is this a correct and workable modification for such a 4 unit set that has a 4 ohm speaker from the factory?
It's workable for impedance, but the amplifier may not be able to drive that large a load with any reasonable volume. It would be best to have very efficient speakers.
4 ohms is 4 ohms is 4 ohms. A 4 ohm load uses the same ammount of power no matter how it is configured.
4 ohms is 4 ohms is 4 ohms. A 4 ohm load uses the same ammount of power no matter how it is configured.
I don't think that is correct when it comes to speakers. The impedance matching is to protect the amplifier not the speaker. So as John says he has matched impedance. Now you need enough current flow through the 16 ohm speaker to mechanically vibrate the cone. Each speaker will get 1/4th the current that a single 4 ohms speaker will get. Is that enough to drive those speakers properly? I doubt it. Maybe he will post results and we will find out. G
4 ohms is 4 ohms is 4 ohms. A 4 ohm load uses the same ammount of power no matter how it is configured.
On what planet? Clearly, you've never seen a 150 watt 4 ohm speaker!
Re: power for each of 4 speakers in this setup--since current is divided by 4 compared to a single speaker, and voltage remains the same, the power to each speaker (watts, or volts x amps), is going to be 1/4 of the power the single 4 ohm speaker was getting. So as gunrunnerjohn points out, the 16 ohm speakers must be "efficient" to produce decent sound with 1/4 of the watts and power to each. I've emailed Brian Scace, the editor at OST, and asked him to pass on a link to this thread to the author, John Sethian. Hopefully John will come on here and talk about his results and how he dealt with this "efficiency" issue if it turned out to be a problem using the MTH 16 ohm speakers in his F7 consist.
I have a 30-1215-1 0-6-0 RailKing engine. The sound is becoming distorted. I am going to trouble-shoot by replacing the speaker. The print is not visible. I see a number that looks like a 6. But I really can't tell. I heard most Proto 2 engines have 8 ohm speakers. Am I right.
I'd put in a bigboy style speaker in my 3rd rail Q2 that id endup putting in a ps1 system and boy the sound is more clear and louder too..
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