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Rich,

I think it’s too early to seriously to talk about sound of your driver. As I understand you have no horn for this thing. Your comment that the driver goes all the way unto 8kHz clearly indicates that you used wrong horn before. If you stick a driver into 4” throat of a promptly bult horn then… bye-bye the driver. The horn will completely overwrite the driver’s performance and the driver’s characteristics even if you go for a shortest tractrix profile. People mostly accustom to the Altec, JBL, Edgar and others toy-like upper-bass horn with oversized throat of almost triangular shape when the driver is acting as a direct radiator. In those so-called horns the horn largely inherent the sonic attributes of thier drivers … because in their “horns” the driver are responsible for sound not the horn loading is responsible for sound.

You, in your case went for very radical 4” throat with targeted 40Hz-50Hz of mouth. This is very drastic and your huge horn that will be required will wipeout what you know about the sound of your driver. When you put a first time RTA with the driver mounted to the horn then you will know what I mean….

Anyhow, I assure you that in 4” to 50Hz horn your driver will hardly be able to care 4kHz and what if does then it be very strange and very spooky decay, and that would be all right. Still, finding the correct value of filtering coil for this channel, find out how the voice coli of your midbass driver affect the MF driver, to find out how to tune the back chamber to the given horn, learn hot to deal with resonanses on the cone when the cone begin to feel the throat reactance of that all air in the bell of the horn….  and many other thing should take I would say a few month. It is if you have the horn already built…

Rich, when you bult the pair of those straight 4” to 50Hz horns (it looks like 10”) and make the rest of your system to work with it then give me a call and invite me in your place. Nope, not necessary to listen your playback! What I will be doing is opening a small kiosk next to your home and will be selling the tickets to the varicose Morons, demonstrating to them what Audio might lead to….. :-)

The Cat

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