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What is the Sound Difference between Mu Metal and Amorphous Core Transformers?

  • 2017-03-22 16:49:23
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Many customers are wondering the sound difference between Mu Metal lamination transformers and tape wound amorphous core transformers. We have forwarded the question to the engineers and below answers were got after comparative experiments:


We found sonic consistency between the transformers using the same core material and differences between transformers of the same application type with different core materials. Here is a summary of our observations:


The amorphous core transformers provide a very open and detailed “picture” of the space that was recorded, providing a very high level of detail recovery. A particularly memorable example of this “see-through” quality was evident on a solo violin recording where the performer’s breathing was readily audible during playback of the performance with the amorphous core transformers, but was only evident with the Mu Metal core transformers if the listener really focused on hearing the breathing. The breathing sounds were there with both transformers, but there is less of an emphasis on detail and more upper bass / lower midrange warmth with the Mu Metal transformers. The brush strokes are broader with the Mu Metal core transformers and they convey more “body”, whereas the amorphous core transformers offer finer brush strokes, which results in hearing more of the details while listening to the whole.


The difference between the transformers made with the two different core materials is not large, but the detail and tonal shading differences are easy to hear with the appropriate recordings. If the equipment in which one of these transformers were to be installed with has plenty of sonic body already then we would choose the amorphous core version for its substantial transparency. On the other hand, if the sound is a bit light-weight, then a Mu Metal version is probably the best way to go.

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