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From: George's Pro Sound Co. on 22 Mar 2010 15:13

"Rupert" <foodsteaks(a)gmail.com> wrote in message
news:e1a6ae9e-3d06-40d8-9a6d-77e6d345c921(a)k5g2000pra.googlegroups.com...
On Mar 21, 3:58 pm, "George's Pro Sound Co." <bm...(a)yahoo.com> wrote:
> "Rupert" <foodste...(a)gmail.com> wrote in message
>
> news:a682412b-8ab2-4708-bba6-a67f6e7d072f(a)p3g2000pra.googlegroups.com...
> On Mar 21, 10:15 am, bob urz <so...(a)inetnebr.com> wrote:
>
> >http://www.meyersound.com/sound_solutions/?m_id=27
>
> > bob
>
>> That might good thing to point newbies to though the example sited is
>> Meyer specific. IOW, it doesn't allude to a duty cycle or percentage
>> of average vs. peak current. But it it's a good tipoff. Powered
>> speakers like the ones by Mackie often only list maximum current
>> rather than what the box will actually draw with real music. They'll
>> say use a 15A or 20A service (@120v) for a box that will likely draw
>> less than 5A even when they're being hammered. At least nowadays the
>> good amp manufacturers will post 1/8 and 1/3 current draws at a given
>> speaker load so people can plan for a more real world scenario. 1/3
>> of max draw at a given load has been worse case in my experience with
>> 1/8th being more on par with dynamic sources and occasional clip/peak
>> limiting.
>>
>>Rupert
>
> I use the 1/3rd method to determine ac service requirments
> George

Yup, same here. If you were to distro for the maximum possible draw,
the distro would be a 100 3� where a 50A single phase service would be
fine. Overkill to say the least.

Rupert

Please note this is for SOUND ONLY
for lights I spec 100% to120% of full load
George


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