Sorry for newbie question.

What sort of frequency will the combination (811b horn & 808-8B 1.75") Comp play upto where one would benefit from adding a tweeter?

What is the upper limit I should bare in mind when researching tweeters to go over this combo?

I have just bought 811b horn & 808-8B 1.75" Comp - I have a few week wait before I can get my hand on them and feeling impatient.

I have seen a number of pictures of tweeters over the horn and was left wondering.

Thank you!