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Thanks David. Because Peter had set his horn to play at 650Hz I used that frequency in the wavelength calculation. If I got it right, you can see from the attached the 10's start to overlap into the RCF horn lip. The 10's are about 260mm from the horn's center. The RCF HF950's cut off frequency is 400Hz. So, I can either go down to 600Hz as you suggested, or stay at 650Hz and cut a little into the horn's outer edge so I can get the 10's closer.[ATTACH]204072[/ATTACH]
Thanks David. Because Peter had set his horn to play at 650Hz I used that frequency in the wavelength calculation. If I got it right, you can see from the attached the 10's start to overlap into the RCF horn lip. The 10's are about 260mm from the horn's center. The RCF HF950's cut off frequency is 400Hz. So, I can either go down to 600Hz as you suggested, or stay at 650Hz and cut a little into the horn's outer edge so I can get the 10's closer.
[ATTACH]204072[/ATTACH]
