yes it might be possible especially if you unsolder the leads and leave them loose if a speaker wire touches ground or chassis of the engine you just blew the amp and possible all the electronics and the ps 2 3 volt n 5 volt boards are not cheap, you'd be better to just order the speaker and install it when you get it! depends would you rather spend $15.00 to $20.00 or have to replace a $ 200.00 board the choice is yours !
Alan