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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: More Wattage posted by Inmate51 on December 1, 2014 at 08:46:03:
...at a high level, the reason a solid state amp might appear to put out more power into lower impedances is that it tends to approximate an ideal voltage source. i.e. zero output impedance/infinite current delivery capability. So...if our voltage source amp can deliver say, 16W into 16ohms, that's 16V across the 16 ohm load. Drop the load to 8 ohms and the 16V remains constant so now we have 16^2/8=32W. Drop the load to 4 ohms and we get 64W and so on. Few amps have the output stage or PS beef to actually accomplish doubling of power when impedance is halved but the trend is present. As always, there are exceptions, notably the Mac SS amps with autoformer outputs. These tend to deliver the same power into any load that matches the tap impedance...just like a transformer coupled tube output stage.
Since this is a high level discussion, we'll avoid the issue of non-optimum primary to secondary coupling that occurs with most OPTs incorporating tapped secondarys when used with the lower impedance taps. I believe this is what gives rise to the impression that transformer coupled tube amps do better delivering power to high impedance loads.
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Follow Ups
- But answering Mr Steady's question a little more directly... - Steve O 19:20:08 12/02/14 (0)
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