Here is the insert for the back piece. Same idea as the side pieces. I cut a big piece of plastic (Polystyrene about 1.2mm thick) and mounted the exciters to the back of it. The plastic in the side pieces is thicker and more rigid, but for this I wanted the whole thing to be able to bend/flex more, so I used something thinner. The plastic goes into the covering, then the foam padding squished behind it.
One thing that might not be clear from the prior pics and these. The exciters I'm using are 'Visaton' (locally available) but they are fully open so I found that in this situation, when you have your body weight compresses the cushion, it can interfere with the movement and even block them. I solved it by putting a make-shift plastic ring around them. Material used = old small peanut butter plastic jars. Perfect diameter. The side cushions I used the jar, cutting a section to be fit around the exciter (you can see in the pictures from my other post). For this back piece, I used the lid (the blue piece in the pics), which is just the right height, and I cut out the centre so they can still freely move and don't bottom out.
Also a picture of the seat, in case it’s not really clear what I’m doing here. Those padded inserts are standard with the seat I have, so when put back together everything looks absolutely stock.
Haven’t tried it out yet, but maybe later today. I’ll have to swap the connections over from the side wing ones though. I only have the one Nobsound amp so I’ll need to order another one.
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