I have a number of older Athearn diesel locos that I have fitted with DCC. I now want to equip some with a generic type sound unit and don't know too much about the sound side of things. Looking at the manufacturer's data it seems to me that most suitable units come with an un-baffled  28mm speaker. I'm fairly certain I will have trouble getting a 28mm speaker in my locos especially if I need to make a baffle for it and it looks like I may need to buy a replacement speaker at the same time.

So this may be a zany Idea - indeed, it probably very well is!  But bear with me for a moment, there may be something here afoot!

I drew it all up in this simple diagram.  One diagram spares a 1000 words - wheeh!!

Hi all,

I have looked at equipping some of my engines with sound and have more then a few concerns, listed below:

1/ Cost, the conversion from a Digitrax decoder to a sound decoder either Digitrax or MRC will add about £50 per unit.
2/ Difficulty of the install in N scale, fiddly, accident prone...
3/ And mostly, sound quality is really poor, tinny thin unrealistic sound which is more distracting and annoying then a good upgrade.

So reading around I came across the following idea and I am interested in opinions.