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Re: Pipe modes [message #47183 is a reply to message #47180]

Thu, 23 June 2005 19:42

16
Messages: 4
Registered: May 2009

Esquire

All reasonable horns that might be considered for a compression driver such as the TD4001 and others of its type exibit frequency-dependent resonances depending on the size and geometry of the horn. There is a fundamantal resonance frequency, and also harmonics of the fundamental higher up in frequency. These can be detected by doing impedance vs frequency measurements of compression drivers with various horn assemblies, and they will show up as pronounced peaks in the impedance curve.
The 4001 has a 3" long conical throat that can't be avoided due to its large alnico magnet structure...that is just the way it is made. Other drivers in the TAD range do not have such a long throat section due to their very much smaller Nd magnet structures. In fact the 4002 pretty much has almost no throat to speak of.
The 3" throat inherent to the 4001 will have some resonances, albeit at fairly high frequencies. However, the point to remind oneself of is that if you listen to a comp. driver without a horn and you like the way it sounds, then your brain has already computed that any resonances it may have are either musically insignificant, or at least musically acceptable. In respect to our Model 16 design, the hornless approach had many subjective virtues associated with it that made it a compelling and appealing trade-off.
For most of the development time during the Model 16 project we were sure that the final design would include a horn, and as mentioned some fairly serious trials were undertaken in this area. But at the same time we had also put in many hours of low-level listening running the 4001 sans any kind of horn, and we had become accustomed to the way it was speaking to us. It was ultimately felt that there was something very direct and special about the hornless approach, and so we though "f__k it, let's just develop it along these lines and try and get it to work..."
There are actually many little tweaks built in to the Model 16 system that aren't obvious on paper or to the eye...the hornless thing just happens to be one of its very obvious deviations from standard practice.

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[Message index]

		HF Compression driver without horn flare? By: Paul Holland on Sun, 19 June 2005 05:13
		Re: HF Compression driver without horn flare? By: Wayne Parham on Sun, 19 June 2005 08:27
		Have no other info. (nt) By: Paul Holland on Mon, 20 June 2005 04:23
		You might ask them By: Wayne Parham on Mon, 20 June 2005 09:22
		Re: You might ask them By: spkrman57 on Tue, 21 June 2005 15:19
		Re: You might ask them By: Paul Holland on Tue, 21 June 2005 23:35
		Re: You might ask them By: Wayne Parham on Wed, 22 June 2005 03:19
		OK, heck, I'm curious as well so I will ask them... By: Greggo on Wed, 22 June 2005 20:24
		Re: OK, heck, I'm curious as well so I will ask them... By: 16 on Thu, 23 June 2005 02:30
		Pipe modes By: Wayne Parham on Thu, 23 June 2005 04:59
		Re: Pipe modes By: Greggo on Thu, 23 June 2005 06:33
		Re: Pipe modes By: Wayne Parham on Thu, 23 June 2005 07:02
		Re: Pipe modes By: Greggo on Thu, 23 June 2005 07:48
		Re: Pipe modes By: Wayne Parham on Thu, 23 June 2005 12:54
		Re: Pipe modes By: 16 on Thu, 23 June 2005 19:42
		Re: Pipe modes By: Wayne Parham on Thu, 23 June 2005 20:54
		Re: Pipe modes By: 16 on Thu, 23 June 2005 23:14
		Re: Pipe modes By: Wayne Parham on Fri, 24 June 2005 06:33
		Re: Pipe modes By: 16 on Fri, 24 June 2005 20:14

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