The pre-amp board is also designed to allow the removal of the separate battery for the sound module. If you just remove the separate battery and provide a voltage derived from the amp’s main battery without a pre-amp there will be lots of distortion all all volume levels, not just really high levels.
If you only have distortion with long wires or loud volumes, the pre-amp may help. There are many potential issues that can cause distortion and the pre-amp fixes several of them!
That’s tough to answer - It depends on how the pot is connected and also the characteristics of the amplifier. The output of the sound module is a high frequency differential PWM (way above audio frequencies) and can be very sensitive to long wire lengths. That signal running over long distances may be the source of the distortion. The pre-amp converts this into a more standard line level output that contains only audio frequencies, so should be less susceptible to distortion with long wire lengths. Just keep the wires between the sound module and the pre-amp fairly short for best results.
Sounds good - anything is worth a try.
Put me down on your waiting list for one please!
Put me down on the waiting list for a ready to go chip please 
Put me on the interest list for one as well, please.
Worked like a friggin charm! Had it built in literally 10 minutes!
Please put me down for a built one too. 
Sent from my GT-I9000 using Ghostbusters Fans on Android
Please put me down for a ready to go!
I would like to be added to the list please for a ready to go kit!
I’d like to be put on the list for a ready to go kit if that’s possible!! Thanks
This worked great. Very easy to install. Thanks for doing these.
The next round of boards have been built, tested and are ready to ship!
PM’s have been sent to all who were on the interested list.
The interested list has been removed since the boards are now available.
PayPal incoming. Thanks!
Skully paid …thanks Doug…
Payment sent.
All completed orders have been shipped!
Please add me to the list for 1 Ready-to-Go! I was -just- thinking this would be handy.
Paypal sent. Sorry for the late payment. Been on holiday!!
No Worries!
Your package is going out tomorrow morning.