There are a lot of guides about the pickup height for singlecoil and humbucker pickups but there is very little guideline on active pickups. I have had my pickups in the default position since I bought my guitar (Ibanez RGA) but they have slowly lowered over time and I think I should find out some more detail about tone before changing them. I play a variety of guitar styles: Metal, Funk and Blues mainly. Are there any heights that work for all or which are best for certain ones. I need the best sound quality too and the right balance of high/low frequencies. Thanks
There is no absolute answer to this question. In reality any pickup height can work for any style of playing. What will change with different pickup heights is the tone colour, for two principal reasons:
Both of these points apply independently from the fact that you have an active pickup. Active pickups still use magnets and coils just like other pickups, so all of the points you have read elsewhere about pickup height will also equally apply to active pickups. The best advice is just to go ahead and try out some changes until you get a feel for a sound you like.
As stated, your question asks for the "best" sound quality and I think this makes the question too subjective to give a definitive answer.
I'm a professional musician.
When I was around 15 I was really obsessed with settings on my bass guitar. Not just pickup heights. The whole ergonomic problems were there as always. Because it's still very primitive against to nature of art.
So I met the best known guitar creator in my city and asked him if he can reduce the 1.00 mm from bottom of the finger board part which is on the body section with screws. Also another reducing from top of the finger board almost 1.00 mm. I remember his assistant gave me a look "Are you OK?"
Almost 10 years later I went him once again which means after I went on tours, recording albums with known artists etc. Yes once again I asked him something interesting. His answer was that "I will make you a signature bass. Lets talk about Nietzsche now..."
When my signature bass guitar was getting done I had an amazing chance to spend time with the creator who is a very special human being. Many days we discussed about the guitars took hours and hours.
The answer for your question is that: