F2b vs f215mk2 - BPH vs FLH

If someone has ever compared to pro midbass such as f1 f215 mk1/2 can explain wich is better and why? 

If we want to be more theorist, what are the advantages of a BPH over a FLH?

Besa wrote: Reading the forum I can say f2b it’s considered the best horn design between 50-250hz. Especially used as kick bin but capable also to be used in stand alone.

Best sounding cab, I've ever heard, between 75-300hz, is 2x15 reflex.

I always run subs up to at least 80-90hz, so don't need low mid cabs, doing sub.

I'm thinking, cab optimized for correct pair of neo reflex drivers, which have true reference efficiency ( η ₀) over 4.0%, would be quite lethal, even outside.

I would not treat that 18sound S218 as a 6th order design (look at the impedance).

The gain you receive from the front chamber is not in the usable range and is completely filtered out.

The configuration itself is to achieve maximum cooling and thus trying to minimise powercompression.

i don't really have anything meaningful to add here other than doing a lot of research a while ago and coming to the same finding as you: the F2B is shit hot.

(and also impossible to buy, and hard to find good plans for!)

You need to look at impedance, not phase.

A bassreflex arrangement would have two peaks, inbetween those two peaks is the impedance minimum which is the tuning frequency. Would it be for example a Bandpass cabinet you would find a third peak and a second impedance minimum. With the S218 it is there, but very minimal and its gain is out of the usable passband. The gain you receive from the front chamber will be filtered out completely.