Correct way to wire two 4ohm speakers to show 2ohms to amp. (1 Viewer)

[Reginald Trent]

Can anyone help?

 

[Greg Monfort]

Multiple resistances in parallel can be calculated with Rt = 1/(1/R1+1/R2, etc.,). Substituting 4ohms for R1 and R2 you get Rt = 2ohms, so wire them in parallel, i.e. jumper the two (+) together and the two (-) together.

GM

 

[Reginald Trent]

Thanks Greg.

 

[Allen Ross]

i personally like to think of resistors in parallel as the product over the sum, so (R1*R2)/(R1+R2) works the same way except for 3 in parallel, but when does that ever happen?

 

[Greg Monfort]

Pretty often for me back when I was freelance designing PA stacks and line arrays.

GM

 

[Chris Tsutsui]

I guess the next question should be how to wire parallel.

Do you connect one driver to the other, and then one of the drivers to the amp? Wouldn't this result in a marginal signal delay between drivers which may cause audiophile nightmares?

Or do you connect both drivers to the amp. Or do you connect both wires together, and then connect the amp wire between the 2 wires connecting the drivers?

I know there will probably not be a difference, but what if the length between the drivers was one mile... Then would there be a significant difference in parallel wiring? Just curious...

 

[Dan Wesnor]

The delay of a few extra feet of wire is much, much, much less than that of the manufacturing tolerances in typical drivers, caps, and coils. Don't worry about it.