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Audio and Video Talk
General Discussion
How can Audio Tweak justify their pricing for Oppo DVD players?
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<blockquote data-quote="Ampdog" data-source="post: 16863" data-attributes="member: 144"><p>Oh dear - there goes my tea invitation. I agree with all Croak said except this one. It is a step-down transformer, and yes, unless properly rated ..... but that is a general for everything. Such transformers are usually auto-transformers (meaning in essence one tapped winding) with an about 90% efficiency. Theoretically this will reflect on overall efficiency, but in any properly designed equipment should not reflect at all on audio quality. The "internal impedance" of many 110V supply lines in the US is not that great anyway. Isolation transformers (i.e. two separate windings) are often used in medical equipment, where demands are higher than for audio as said before.</p><p></p><p>As always I respect Croak's experience, but I wonder if he had such an experience, whether it might have been specific to a situation? </p><p></p><p>But not to make this sound over-important compared to the other points mentioned by Croak. Buyer do beware, especially with equipment including receivers!</p></blockquote><p></p>
[QUOTE="Ampdog, post: 16863, member: 144"] Oh dear - there goes my tea invitation. I agree with all Croak said except this one. It is a step-down transformer, and yes, unless properly rated ..... but that is a general for everything. Such transformers are usually auto-transformers (meaning in essence one tapped winding) with an about 90% efficiency. Theoretically this will reflect on overall efficiency, but in any properly designed equipment should not reflect at all on audio quality. The "internal impedance" of many 110V supply lines in the US is not that great anyway. Isolation transformers (i.e. two separate windings) are often used in medical equipment, where demands are higher than for audio as said before. As always I respect Croak's experience, but I wonder if he had such an experience, whether it might have been specific to a situation? But not to make this sound over-important compared to the other points mentioned by Croak. Buyer do beware, especially with equipment including receivers! [/QUOTE]
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Audio and Video Talk
General Discussion
How can Audio Tweak justify their pricing for Oppo DVD players?
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