What is the impeadance of each voice coil? If they are 4ohm or 2 ohm then wire them in
series to your new amp. If they are 8 ohm then wire them in
Parallel to the amplifer.
Series: Run the + wire (from Amp) to the + on voice coil one, then from the - on voice coil one run a wire to the + on voice coil two, then from the - on vioce coil Two you connect the - lead from the amplifer
Parallel: Run the + and - from the amplifier to the + AND - of voice coil 1, then simply solder/crimp wire from the + and - on voice coil one to voice coil two (ensuring that + goes to + and - goes to negative)
This will ensure the coils are wired in Phase (which is very important) Hopefully that helps
Should be running in no time
[Note: Edited to correct my mistake, Thanks to bobqpsr]