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Love them.  I have 6 that work scattered around my layout.  Run the loco yard (steam & diesel) ones through larger speaker boxes mounted under the bench.

Yes QS Industries made some nice stuff.  I also have about a dozen of those car loads.  The kids loved the chickens and turkeys in the box cars.  I run the cattle one in a stock car.  Visitors look and say "what the heck was that?"  Just fun stuff.

The Sound Blox has 5 terminals.  The terminals labeled left to right are labeled Spkr1, Spkr2, Spkr3, 12V, Gnd.  As shipped there is a jumper or shorting wire between Spkr2 and Spkr3 which enables the internal speaker.  Without the jumper, the internal speaker is disabled.  To use an external speaker, remove the jumper.  Attach an external 8 ohm speaker's leads to  Spkr1 and Spkr2. 

Power for the Sound Blox is listed as 12 to 17 volts by QSI and 11 to 17 volts by MTH ProtoSound.  I've found it will work down to 9 volts.  It can be AC or DC.  It is not polarity sensitive.  12 volts AC or DC is quite adequate.  Tie it to the 12v and Gnd terminals.

Light it up and enjoy.  Hope it works for you.

gg1man posted:

I'm sorry QSI went out of business, they made many great products.

I associate QSI with MTH's problematic PS1. It caused a lot of hassles for the folks who didn't know that a depleted battery could result in a scrambled chip. It took me a year to figure out how to revive a secondhand MTH locomotive, since I had no previous experience with these and less internet access at the time.100_1802

Regarding SoundBloxx, I imagine there are many other options now for playing back custom digital sounds, but I note that SoundBloxx had a random sequence feature? As well as being conveniently unitized.

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Last edited by Ace

You can actually home brew these things to play any sort of sound you want,  if you don't mind soldering together a small kit.   

The digital sound recorder units below -- which are available from a bunch of electronic hobby suppliers -- can hold up to 90 seconds of high quality audio, which can be set to play back on demand or  cycle constantly.    I've used them in Halloween props as well as a model of the Disney Haunted Mansion that goes with the toy monorail models Disney used to sell  The Haunted mansion sound is a recording of the "Ghost Host" introduction in that attraction. I found a clear recording of it online and recorded it directly into the kit via a patch cable from my laptop. 

Moral: whatever kind sound effect you want is likely accessible online, and if you want to really customize a sound scheme,  Audacity is a free online tool that lets you do that by mixing sounds together.  I used it to create a sound effect I needed but could not find online: by combining groaning, wood squeaking and cracking and earth moving sounds, Audacity allowed me  create the perfect soundtrack for a "moving grave" prop that is in my annual Halloween  graveyard setup 

As for playback, these recording units can drive the small speaker that comes with them.   But I prefer to use their line output going into a set of carefully concealed small computer speakers.   They put out much better sound and you can still pick them up for practically nothing at garage sales.   Also, as you can see there is a screw in power input, so these can be run off a wall wart or any other form of DC power supply providing  9-18 volts.

sound recorder

Last edited by Dan Fender

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