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Old 30th August 2003, 01:01 PM   #1
rabbitz is offline rabbitz  Australia
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Default Impedance curve......

The is the impedance curve I got in LSPCad for 2 Vifa TC11s in parallel - see any problems?


My amp should should be able to handle it as it is:
115W 8 ohm
160w 4 ohm
175w 2 ohm
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File Type: jpg impedancetc11.jpg (28.0 KB, 215 views)
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Old 1st September 2003, 01:56 AM   #2
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ur amp is 2ohm capable?

nice!
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Old 1st September 2003, 05:05 AM   #3
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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.
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Old 1st September 2003, 04:19 PM   #4
rabbitz is offline rabbitz  Australia
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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.
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Old 1st September 2003, 05:59 PM   #5
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They're probably assuming that you'll wire them in series.
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Old 4th September 2003, 01:39 PM   #6
ucla88 is offline ucla88  Tahiti
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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
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Old 4th September 2003, 02:52 PM   #7
rabbitz is offline rabbitz  Australia
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Thanks Mark.

These will not see much bass below 80Hz as they are setup for rear speaker duties with the speakers set to small. Since the 2 drivers are in parallel, this will halve the cone excursion. The box is tuned to 66Hz which helps some more.
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