What is the impedance on my amp if I have two 4ohm subs and an 8ohm sub wired in prallel

[baker858]

Need help!! Not sure about the impedance level.

 

[Someone Somewhere]

1.6 ohms.
1/Z(t) = 1/Z(1) + 1/Z(2) + 1/Z(3) etc...

 

[Ralston18]

MERGED QUESTION
Question from baker858 : "Need answers please"

What is the impedance on my amp if wire two svc 4ohm subs in parallel it's a svc 8ohm sub?

FYI and reference:

https://geoffthegreygeek.com/calculator-speakers-in-parallel/

There are other similar links with calculators and/or explanation.