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"Enhanced" Anarchy tapped horn project.
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Old 14th October 2017, 12:30 AM   #31
Brian Steele is offline Brian Steele  Grenada
diyAudio Member
Join Date: Nov 2007
Originally Posted by PB2 View Post
What the tapped horn allows is a much larger "box" but if you build a vented system as a much larger box you get similar results. The TH uses much of the box volume for the long line so they usually end up even larger than the vented design. I believe that we came to the conclusion that the TH might be a few dB more efficient but I doubt it.
FWIW, I took the HornResp sim for my POC3 TH (which was designed for a combination of increased efficiency and extension) and converted the sim to an offset TL of the same volume (basically by changing the sim from TH to OD, then increasing L12 until the passband was flattened.

The results were interesting. See notes below

Fb=38.36 Hz, max SPL@Fb=111.3dB
Eg for max linear displacement=22V
Passband SPL: 116.4dB@105.9Hz, 115.7dB@72.0Hz,116.0dB@51.1Hz.
Useful up to 135 Hz
GD peaks @43Hz, 16.9mS, minimum@83Hz, 5.2mS, delta=7.9mS

Offset TL:
Fb=38.91 Hz, SPL=112.4dB
Eg for max linear displacement=23V
Passband SPL: 114dB@51.1Hz, 114.2dB@72.0Hz, 115.5dB@105.9Hz
GD peaks @37.2Hz, 19.5mS, 15.14mS@43Hz, minimum @86.7Hz, 2.8mS, delta=2.1mS

From this the TH can produce about 2dB more SPL across the passband (at the cost of a slightly faster rolloff) with slightly less power required to drive it, and the GD performance is better, even more so once the delta is taken into consideration. The additional SPL with good extension was one of the advantages I was aiming for. But here it's just 2dB, and the TH alignment does restrict the bandwidth more than a TL alignment of the same net volume. The GD seems quite a bit better though.

Pictured is the simmed response curve of the offset-TL.
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