Re: [microsound] powerbook rule of thumb

["Stasisfield.com" <john@xxxxxxxxxxxxxxx>]

>
>>  John, my laptop is really bad in this respect, headphones or line out. I
>>  found that the relatively inexpensive "Hum Eliminator" by EBTECH worked for
>>  live stuff, when I want two lines out. Otherwise, I have to run off the
>>  battery to avoid the hum.
>
>always juice up your laptop before a set and remember to unplug the AC just
>before your performance and run off batteries (this is - of course -
>determined by your set length vs battery life)...the hum - especially on
>older Powerbooks - is unacceptable for performance when juicing up the
>battery...I have found very little hum while using the iMic and I have the
AC plugged in...

sorry this is so late, but I get the digest...

I just wanted to mention a couple things:

- I'm getting the buzz in the headphone jack when running off of 
battery power only. It gets noticeably worse when using the AC. I've 
tested it in various locations, and I get the same results no matter 
where the PowerBook is, so it can't be outside interference caused by 
other equipment in my studio setup, and since it happens on battery 
power only, it's not a groundloop.

- Up until this point, I've been using a clamshell iBook for 
recording and performing. The battery life in my iBook is down to 
about 30 minutes, so for about the last year I've needed to have the 
AC plugged in for nearly all of my performances, and never once have 
experienced this issue--with battery power OR using the AC.

I think there must be a shielding problem with the internal design of 
the new PowerBooks if nearly everyone is experiencing this same issue.

Thanks for all the input!

-- 

>>

john kannenberg

[ http://www.stasisfield.com ]

[ http://www.whistlingpariah.com ]

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