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Ronnie wrote:

I was under the impression that you did not at all electrically roll off the upper bass, and that the small throat would do all the (kinky) low passing.

Nope I did roll of the upper bass channel as my driver goes all the way up. The problem is that when it high relatively high regency then it’s cone because to heavy to handle then with a sufficient quality. I would wish that the sampler throat do all necessary low passing but I need to dive 3 octave in the operation region of the driver and certainly no one throat would be able to do it. It might be possible to fish something by tuning the front chamber but I personally do not believe in the front chambers, as with cutting frequencies I would loose sound as well.

Ronnie wrote:

So I have started out running the big horns without any filter. Maybe the whistling distortion is in the 4-5-6KHz area and quite natural for the Fane Studio 8M when it tries to sing higher than it can?

Hm, even without any lowpass filter the Fane Studio 8M should be quite clean atop and defiantly it should not any “whistling distortion”. Did you try to listen juts the upper bass channel without any MF and HF connected? Did the “whistling distortion” persist? Also, the Fane’s cone is very inactive and it talks with you MF channel coil when they are connected…. Still, what amplitude you have at 4-5-6KHz from Fane? How close (in DBs) your MF and Fane channel running after the MF kicks in?

Ronnie wrote:

Do you think this MF whistling noise is natural for the Fane and must be filtered out with low pass?

Hmmm. It defiantly sound be minimized at a few DB lower then you have now by low passing the channel but I would not cure the symptom and would search go for the souse of the problem. The problem you described should not be in this driver; at least the 5-6 pairs that went over my own hands did not have it. Ronnie, could you elaborate what the “whistling distortion” might sound like?

The caT

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