parts replacment

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There's no way to say definitively whether the sub will work or not without more information. Even with more information, it may be difficult to predict whether a transistor will work as a sub. As examples, IRF540 vs IRF540N in Rockford amps. The N version has almost identical specs but rarely works properly. In class D amps, sometimes minor changes by the manufacturer will result in FET that won't work even though the part number is identical. You need to take the time to describe how they're being used (class b or class ab audio drivers, class d audio/switching drivers, power supply drivers...). If you also list the amplifier, that may be helpful.

How are these being used?
 
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