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Amplifier Weight
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<blockquote data-quote="chipwelder" data-source="post: 73909" data-attributes="member: 54"><p>Transformers are a main reason, casings and heatsinks and possibly even large banks of caps the next...</p><p></p><p>Here's the deal as impedance lowers the current requirements increase, as per your formula... into 8 ohm 100 x2 watt needs a 200 + say 15% for sagging VA transformer... that's niks, into 4 ohm, if your output stage will do it, it requires a roughly 400VA +15% transformer, into two ohms if your output stage can do it, few can notably Krell etc, need 800 VA, into 1 Ohm, I know of Krell whose outsput stage will do it, probably pass labs too, you need 1600 VA + 15 % for sag - that's a serious hunk of copper and steel... although it is Krell, so it is probably 2x1kVA transformers... and also some serious other goodies... So in order to cope with weird impedance some amps will be heavier.</p><p></p><p>Yamaha? didn't think they were especially heavyweight?</p></blockquote><p></p>
[QUOTE="chipwelder, post: 73909, member: 54"] Transformers are a main reason, casings and heatsinks and possibly even large banks of caps the next... Here's the deal as impedance lowers the current requirements increase, as per your formula... into 8 ohm 100 x2 watt needs a 200 + say 15% for sagging VA transformer... that's niks, into 4 ohm, if your output stage will do it, it requires a roughly 400VA +15% transformer, into two ohms if your output stage can do it, few can notably Krell etc, need 800 VA, into 1 Ohm, I know of Krell whose outsput stage will do it, probably pass labs too, you need 1600 VA + 15 % for sag - that's a serious hunk of copper and steel... although it is Krell, so it is probably 2x1kVA transformers... and also some serious other goodies... So in order to cope with weird impedance some amps will be heavier. Yamaha? didn't think they were especially heavyweight? [/QUOTE]
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Amplifier Weight
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