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be wrote:

Both the Fane and the Goto where used as compression drivers, so there where no principal differences of use.

Wow, who made such experiment? Bring this person to my forum, it would be interesting to interview him! I still do not know about the “principal differences of use”. If Fane and Goto were loaded in the same horn then how that person equalized the system primary resonance? Then there is another ketch: Goto and Fane cones/suspension are very different and they might (and most certainly will) react differently to proximity to the throat reactance. Go figure if the Goto and Fane were used identically properly in respect to own topology.

Let to be honest, if I had borrowed Goto drivers then I would do the same: juts plug up one, then another and then listened what was better. I would NOT modify or rebuilt a new horn to accommodate it to Goto needs. It is possible that Fane as compression used Fane is better driver for bass, in fact is it what I based upon my theoretical assumptions, some of them listed above. However, I would like do not send a message to others that bass compression drivers is a not perspective direction to go. I think if the bass compression drivers are properly implemented (no one does it) then they might be fine. Still, I personally feel that the threshold of the diminishing return with bass compression driver located somewhere around 150Hz. To go lower with compression driver does not make practical sense.

be wrote:

The sound of the Goto 505 in the lower range was similiar to what you hear from a 8" woofer trying to do what a 15" can in the bass.  Although the sound was clean as free of distortions, it lacked impact and authority.

Well, makes sense of course. Only God knows what the Goto 505 primary resonance is. The company claims the frequency response 100Hz-6KHz (loaded) with no further information about primary resonance. For a manufacture that does ONLY drivers it is very bad do not release more data about their drivers. Here is what Fane has:

http://www.romythecat.com/Site_Images/FaneStudio8M.jpg

be wrote:

Maybe it is not a problem with the Goto driver, but maybe there are limmit to horns ability to transform great ratios of impedance, just as there is with electrical transformers? The air presure at the beginning of the horn in the Goto case will be higher, maybe the non linearity of air starts to be a factor producing compression?

An interesting question. You presume that higher compression has problems to be transfer over the horn. I know very little about it and I generally disregard the theory of pressure conversion in horn as anything that explains Sound in horns. A week ago I have replied in another accidental site to a comment about the horns purpose:

Jdza: The function of a horn is to couple the very high acoustic impedance at the loudspeaker to the very low impedance of the air in the room so a giant transformer with no iron, no wire-just pure clean air.

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