High impedance is no problem for an amp. If it is an amp designed to give out 8 ohms, an impedance peak well over 8 ohms will give it no problems at all.
Low impedance is the problem.
I see that your lowest impedance is about 2.8 ohms. An amp rated for 2 ohms will handle it with ease. It is low impedance that causes the problems. High impedance is a piece of cake.
Low impedance is the problem.
I see that your lowest impedance is about 2.8 ohms. An amp rated for 2 ohms will handle it with ease. It is low impedance that causes the problems. High impedance is a piece of cake.
I think the graph is a bit misleading as I believe the impedance would start to rise from 400Hz on based on the Vifa's graph. I can't measure this. Seems similar to the impedance for the LR speaker in chapter 12 in the Loudspeaker Design Cookbook - bottoms at 3 Ohms. Probably classed as a 4 Ohm speaker.
The amp manual is interesting as it states "if you use one centre speaker, the impedance of the speaker must be 4 ohm or higher, if you use 2 centre speakers, the impedance of each speaker must be 2 ohm or higher". I thought that with 2 speakers you would need 8 ohms or higher.
The amp manual is interesting as it states "if you use one centre speaker, the impedance of the speaker must be 4 ohm or higher, if you use 2 centre speakers, the impedance of each speaker must be 2 ohm or higher". I thought that with 2 speakers you would need 8 ohms or higher.
I think you will be fine. The impedance will be a bit low, but not much power will be going into these TC11's-they can't handle that much. Really, only a couple of watts at the low end before they start to distort. See my impedance curve and comments. I suspect your impedance will be around 2.5 ohms.
Link to Vifa TC11 project
Link to Vifa TC11 project
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