Continued existence of Class-AB amps?

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On Mon, 29 Aug 2005 15:16:54 -0400, "Arny Krueger" <arnyk@hotpop.com> wrote:

>It's done on the pro audio circuit, all the time, for
>example:

The QSC amps you mention use a switching power supply and can work on 115 V
mains.

 

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"François Yves Le Gal" <flegal@aingeal.com> wrote in
message news:n8v6h1djdqa27figvtavr92khjlrcsr4vb@4ax.com
> On Mon, 29 Aug 2005 15:16:54 -0400, "Arny Krueger"
> <arnyk@hotpop.com> wrote:
>
>> It's done on the pro audio circuit, all the time, for
>> example:

>> QSC Powerlight 6.0II 1150 wpc@8 ohms 20-20K < 0.1% THD

> The QSC amps you mention use a switching power supply

Agreed. They are also Class G.

> and can work on 115 V mains.

Normal 120 volt power circuits in the US are circuit-breaker
protected @ either 15 or 20 amps.

The PL 6.0 120v Current Consumption(1/8 Power Pink Noise @
4 ohms) is specified to be 16 amps.

It would seem to be difficult to fully exploit a QSC
Powerlight 6.0 on a normal US 120 volt circuit.

I've observed them used for SR at a live concert, running
off of 230-240 volt circuits.

 

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In article <--SdnUN-sI__647eRVn-1g@comcast.com>,
"Arny Krueger" <arnyk@hotpop.com> wrote:

> No, I meant that both apparent complexity for a given
> function, and semiconductors have a long history of
> improving dramatically. And, often its the latter that
> enables the former. Higher level of semiconductor
> integration reduce apparent complexity by taking a
> basketfull of parts and integratnig them into one small
> package with a few leads coming out if it and few if any
> external parts.

I do not understand why this is not entirely an improvement in chip
tech. I do not understand how complexity can be subject to terms such as
improved or worsened.