Hi and maybe I should say sorry for resurrecting this old thread. But maybe it's worth for someone else if this gets elaborated a bit.

So got an id4 the other day too. When I did the first look to try and sum up what needs to be fixed I thought one bb speaker was out and also the one I the cab. Didn't think about it much more but now that I looked at it again more thoroughly I found that there should be only one speaker in the bb and also that the bass speaker works indeed.

The issue is that the base speaker can't really be heard unless I turn up the volume to about 50% but, as the op experienced the one bb speaker is then too freakin loud. What in after is to get one more speaker for the bb and also be able to adjust the balance so that the bass can be heard good without the bb speakers blowing up my ears.

On my board there is no third channel components on the board, just the bb speaker channel and the base one.

How would I go about fixing this? Not sure I follow exactly how the op made it work above..
I don't really care if the few stereo sounds are stereo as long as you won't notice it comes from the left as it is now.

/andy

I also noted that holding the right flipper button all the way in to raise even the upper flipper makes the bb speaker hum just like the op mentioned. This might be a universal failure on these games. Any ideas to make this right?