Wireing different subs to one amp

[pico9812]

What’s the best way to wire one 4ohm sub and two eight ohm subs to a mono amp

 

[Alabalcho]

What are your amp' specs?
If you don't care how they will work - wire two 8Ohms in parallel (giving 4Ohms), and put the other one in series (giving total of 8Ohm impedance).

 

[americanaudiophile]

The woofers have to combine to be at least the minimum impedance that the amp will tolerate. This is how you figure it out
http://physics.bu.edu/py106/notes/Circuits.html