Impedance????


Can anyone tell me what I need in order to measure inpedance on my system? and how? Ohm meter?
dlewallen
I do not understand the question but I doubt if bi-amping changes any loads.

Kal
Jim,

If you split a preamp output into two poweramp inputs then the preamp sees the poweramp load in parallel.

When two equal impedances are put in parallel the resulting impedance is halved.

So running a "Y" type splitter from a preamp to two poweramps will reduce the input impedance seen by the preamp to one half of the input impedance of a single poweramp.

For example if you have two identical poweramps with an input impedance of 40k Ohms, and you connect both of them via a Y type split interconnect to a single preamp output then that preamp output will effectively see a poweramp input impedance of 20k ohms.
ok, I have not received the pre-amp i purchased yet(should be here next week) but it is a NAD 1600, I do not know if it has enough out-puts for bi-amping, if I use a "Y" I am changing impedance, So what do I do to biamp?
I think you're worrying too much.

You don't have to match the preamp and amp impedance, in fact quite the opposite.

The output impedance of the preamp has to be low (few hundred ohms or less), and the input impedance of the amp has to be high (10k ohms or more).

It's really only a big factor if you have long interconnects with high resistance or high capacitance, so that cable losses are significant. Under 1 meter it will make little difference.

And, in any case I expect the preamp will have multiple outputs: they usually do.

Post back here if it doesn't sound right. If the input impedance of the two power amps is too low it will likely sound lacking in dynamics, and a bit rolled off in the high frequencies. If it sounds dynamic and sparkly all is well.