On Mon, 01 Jan 2007 18:07:43 -0500, John wrote:
[color=blue]
> On Mon, 01 Jan 2007 08:46:31 -0600, Don Fearn <pooder@charter.net> wrote:
>[color=green]
>>I think it was Hachiroku ???? <Trueno@AE86.gts> who stated:
>>
>>[color=darkred]
>>>Since the speakers were balanced amp-to-amp (ie, 4 ohms wired to the
>>>head unit amp, and 4 or 8 ohms to the external amps), are there any ill
>>>efects to putting speakers out of phase. In case you don't know what
>>>this does, let's take the woofer: when the 'in-phase' side is pushing
>>>out, the 'out of phase' side is pulling in. Since the load is balanced
>>>reactance-wise, there SHOULD be no ill effect on the amp.
>>>
>>>
>>>Right?[/color]
>>
>>
>>Right.
>>
>>
>>
>>
>>But it's been a long time since I was really into electronics geekiness
>>at this level, so I could be wrong. Unlikely, though, as amplifiers have
>>become more robust over the years, and even a dead short won't harm many
>>modern ones . . . .
>>
>>
>>WOOF!! (rO !!FOOW fi er'uoy tuo fo esahp.)
>>
>>-D[/color]
>
> An amplifier can not be damaged by connecting a speaker out of phase .
> Connecting the outputs of 2 amplifiers in parallel in or out of phase may
> damage the amplifiers if they don't have overload protection.
>
> John[/color]
Thanks guys. I was an Elect Tech for 18 years, and have worked with amps
of different kinds, but in Industrial applications, mostly Power Supplies,
where we used Differential Amps in circuits for current control, and Op
Amps in switching supplies. But my theory falls short on power amps, esp
without a schematic. It would seem that out-of-phase speakers wouldn't
cause any damage, but mis-matched loads or trying to tie to amps to one
load like you mentioned.
