Lasonic TRC-920 said:I don't know what it is....but now I'm wondering if I need one![]()
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oldskool69 said:
tshorba said:Ok since nobody guessed right I will tell you
it is to center a voice coil on APM style woofers. Since you can't shim the gap and I don't trust the signal generator on my iPhone I decided to cobble this up to do the "AA" battery method. The switch was installed to make it a bit easier to use and cut the power rather than disconnect the terminals.