Traditional meads often run into problems with low pH, but it does depend on the honey and the yeast. Some honey doesn't drop so much. Some yeast can tolerate low pH better. The Champagne yeast tend to be pretty tolerant of low pH (EC-1118, DV10, Premier Cuvee). Vintner's Harvest SN9 is reputed to be tolerant, K1V also does pretty well. D47 works well even with a pH of 3.0 in most cases, and 71B is usually able to get a mead done.
The Wyeast sweet mead yeast is very finicky and doesn't like low pH. Many other yeast get stressed and sometimes stinky when facing low pH.
I find it really helps to be able to monitor and adjust pH, and if you plan to make a lot of traditional meads, a pH meter is well worth the investment. Lacking a meter, one approach recommended by Roger Morse is to add cream of tartar (4 grams per gallon) which will help stabilize the pH (you can get it at the supermarket).
Medsen
The Wyeast sweet mead yeast is very finicky and doesn't like low pH. Many other yeast get stressed and sometimes stinky when facing low pH.
I find it really helps to be able to monitor and adjust pH, and if you plan to make a lot of traditional meads, a pH meter is well worth the investment. Lacking a meter, one approach recommended by Roger Morse is to add cream of tartar (4 grams per gallon) which will help stabilize the pH (you can get it at the supermarket).
Medsen