Benefits of a one-ohm connection

I beg to differ.  At lower voltage levels, current flow is vastly increased to create the same power.  Good old Ohm's Law; P=IE, or power = current flow times voltage.  For power to remain constant, the two factors must change inversly from one another.

dang, your right again

looks like i should rethink those late night topics before i post 'em.

oops, scratch that

here was my logic

if old school amp ab produces 625 watts at 4 ohms it needs to produce 50 volts output

if new amp d produces 625 watts at 1 ohm it needs to produce 25 volts output

which of these amps needs less current draw?

And, since it is current flow (and the resultant magnetic fields) that produces heat in an electrical conductor, the amplifier having to pass 25 amps will produce more than twice the waste heat as the one passing 12.5 amps.  Morre heat = increased resistance = less efficiency = more current draw = more heat.  More heat = more thermal stresses = less insulation resistance = more leakage current = shorter life expectency.  Higher current = operating closer to limits = lower S/N ratio  = crappier SQ.  Etc.

It looks like newtone means to contrast 4 ohms with a 60% efficient amp (A/B) against 1 ohm with a 90% efficient amp (D)....how does efficiency work into this as far as current draw?

And haemphyst, please bear with me...looking at your 4 ohm example, at 50 volts the amp will send 12.5 amps through the speaker wire.  Right?  But don't we figure amperage IN based on the car's 14 volt power supply?

......the only benefit we might see here is the use of a more efficient class of amp as far as pull on the car's electrical system.......but a class D amp at 1 ohm is of no higher of quality in output than a (similar quality) A/B amp at 1 ohm.......and the sound quality would certainly benefit if the class D amp were loaded at 4 ohms.

So there is no "benefit of a 1 ohm connection" by suggesting the use of a different class of amp.

You might pay for them but the fabulous numbers won't be there.  Because when you push even the great amps into high amperage output the THD and damping factors are gone....either through the roof or out the window.