x-over resistor replacement query

From what crossover circuit are trying to replace the resistor from?

Mills 12 watt wirewound resistors are an inexpensive alternative and are very high quality sonically. In some places, I prefer them to Duelunds in my speaker crossovers. The Mills are also available in a wide range of 1% values.

I have duelund resistors and have had mills etc in xovers, but one of my favourites is the Caddock MP metal film. The Caddocks sound lifeless and dull for 5-10 hours of burn in then become extremely transparent, low distortion, low noise,nice texture. No brainer. They cost peanuts too. About half the price of Duelund resistors.

But obviously your choice is circuit and taste dependant.

I've used both Mills and Caddocks and agree, either would be a good alternative to the more expensive Dueland.

Freschie,
There is no direct answer to your question. If the resistor is in the tweeter pad or baffle step, changing the value will change the volume of the tweeter, so your speakers character will clearly change, If it is impedence compensation, it will change how much your impedance peak is lowered, depending on frequency, you might or might not notice, if it is in a notch filter, it would change how much peak is reduced and also would be audible. As stated by others, without taking considerable measurements, I would suggest that you follow the original design.
I hope this helps, Tim