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<blockquote data-quote="helotaxi" data-source="post: 4136063" data-attributes="member: 550915">250W is still pretty low power.&nbsp; The Accumatch came in 100W and 300w models.&nbsp; Of course at the time, 4 ohm rated power was how the different competition classes were organized.&nbsp; Getting the 1 ohm power out of a high current amp was a big deal on the mids and highs in the lower power classes.Power classes are gone and 4 ohm power is cheap.&nbsp; No need for them.&nbsp; On subs, huge power still means a big transformer and a big transformer still acts like a big inductor (and causes resistive LOSS as well) and a big inductor is still bad for the fidelity of the audio signal.Bottom line, they&#039;re not used in car audio for the same reason that a lot of home audio things are not used:&nbsp; they&#039;re not needed.You dad&#039;s McIntosh amps are probably high voltage/low current amps and need the x-former to get any kind of current to the speaker.&nbsp; Having 120V to play with from the wall makes such things convenient.</blockquote>

[QUOTE="helotaxi, post: 4136063, member: 550915"] 250W is still pretty low power. The Accumatch came in 100W and 300w models. Of course at the time, 4 ohm rated power was how the different competition classes were organized. Getting the 1 ohm power out of a high current amp was a big deal on the mids and highs in the lower power classes. Power classes are gone and 4 ohm power is cheap. No need for them. On subs, huge power still means a big transformer and a big transformer still acts like a big inductor (and causes resistive LOSS as well) and a big inductor is still bad for the fidelity of the audio signal. Bottom line, they're not used in car audio for the same reason that a lot of home audio things are not used: they're not needed. You dad's McIntosh amps are probably high voltage/low current amps and need the x-former to get any kind of current to the speaker. Having 120V to play with from the wall makes such things convenient. [/QUOTE]

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