Getting 2 Fi Sp4s got a ?

[Brandon McCullough 0]

Picking up 2 d2 sp4 18s to put on my taramps 8000...with these having odd coils how much are we talkin the amp will put out on these things?

[emh9009 199]

What do you mean, "odd coils"?

[Brandon McCullough 0]

Arent they like 1.4?

[emh9009 199]

The RE, yeah, but That's not weird at all. They're either dual 1 or dual 2. Don't worry about it.

[95Honda 486]

Additionally, you enclosure is going to be what dictates your impedance.  The Re of the coil will relate to little of your overall impedance.

 

Without knowing what the enclosure impedance is, you will have no idea how much power the amplifier is producing.  You can attempt to measure the output power of the amplifier with an RMS voltmeter and inductive current probe (clamp) but you would have to do it over a wide range of frequencies to be meaningful and count on the test equipment being accurate...

[95Honda 486]

To give you an idea of what I am talking about, attached is an impedance plot.  If you notice, there is only one point where it drops to the Re of the driver, everywhere else it is higher.  Also, it isn't "Box rise" , that is a made-up term because impedance both rises and falls...

 

[Brandon McCullough 0]

i gotcha thanks guys for the quick respsonses