Replacing capacitors in Dalquist DQ-10 Speakers

I am considering having the five capacitors replaced in each of my Dalquist DQ-10 speakers which I have owned since 1976. I did previously have the woofers re-coned many years ago.
It is hard to determine whether the age has had a significant reduction in frequency response as they still sound excellent although I would like to make sure they are working at the level of the manufacturers specifications. I have been told that replacing the caps may change the overall balance and quality of the sound that Dalquist had achieved but I would like to make sure I am getting the best sound that the speakers were designed to produce.
Can anyone advise me as to whether I should have the caps changed simply as a result of the age of the speakers and if so what brand of capacitors would be best?
Thanks,
Andy