the makers of my speakers say the nominal impedance is 4-8 ohms.. so i mailed them and they said no speaker is excatly 1 certain impedance but if he had to give a approx it would be 6 ohm.

4-8 Ohm means the speaker is compatible to amps

**rated** for 4-8 Ohm speakers.

A speaker rated 4-8 Ohms is usually a 4 Ohm speaker.

While it is correct to say that a speaker does not have exactly 1 certain impedance the value (e.g. 4 Ohm) probably indicates an average of the impedance or the DC resistance.

E.g. a Dynaudio Contour 1.3MkII is a 4 Ohm speaker, but it's imdepance varies from 3.5 to 14.4 Ohm (manufacturer's rating).

when you bridge an amp it halves the impedance .. so bridging on an 8ohm speaker runs the amp at 4ohms. but if you bridge a 4 ohm speaker the amp see's 2 ohms. and usually only krells and such are designed for this. anyone feel free to correct me if im wrong.

An amp does not have an impedance as such and it can't halve anyone's impedance, in particular not that of an speaker. And of course you bridge the amp, not the speaker - in other words the impedance of the speaker will

**not** change.

Bridging might affect the amps handling of loads though, perhaps a 4 Ohm load is too tough for the amp in bridge mode and hence the use of a 8 Ohm speaker is recommended.

He's basically using his pair of 1070s as a monoblocs, one for each speaker, but each monobloc is still driving both high and low frequency drivers in his speaker so it's not bi-amping as I understand it.

That's how I understand / see it, too.