A friend of mine want's to build some: good sounding, small, efficient, cheap speakers that can also do bass. Well doesn't everybody want that, but I thought a pair of two Pi's using beta-10 drivers would come a long way.
But I have still two question about this setup:

I picked the beta-10 for him because it can be run in a small enclosure (same as alpha-8) while still ofering decent bass. There is one problem however. Due to the lower qts. efficiency goes up above 1kHZ and peaks at 3kHZ. That isn't my idea of a nice sounding speaker.
So we could put an inductor in series to roll of the highs
but this would also give a 6dB steeper rollof at XO and problems matching the tweeter.
An alternative would be to use a notch filter at +/- 2.5kHz, Or just accept a larger enclosure and use a alpha-10 for better sound. What would be the best solution?

Thanks in advance,

Marijn