Duelund which makes better resistors anyway are available in 11 ohm. I have some in my speakers. Try Parts Connexion.Tom
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I hate resistors in a crossover but if you must use them, the fewer the better.
Bite the bullet and go with the more expensive Duelands. The last thing I'd do is run more of them in series just to achieve a desired value. They may protect tweeters but they also add fine grain and often, a bit of sizzle to the highs.
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.
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
Regarding the Caddock metal film, probably not a great idea to replace a 10W resistor with a 2W one. Depending on where it is in the circuit it may be fine, but then again may not.
There are a few 11ohm options, the Dueland and also Parts Express has the inexpensive sand cast inductors in 11ohm. You can also 'make' 11ohms as mentioned, but series or parallel connection. The Parallel option would be better because you also get more power handling that way.