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Author Topic: SPL levels and preamp battery life  (Read 1708 times)

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Offline tim in jersey

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SPL levels and preamp battery life
« on: August 11, 2011, 09:42:53 PM »
How do SPL levels affect the battery life of a portable preamp?

I've always thought the higher the SPL, the less gain needed for proper levels and therefor greater battery life. Is my logic sound (no pun intended).

Offline tim in jersey

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Re: SPL levels and preamp battery life
« Reply #1 on: August 11, 2011, 11:28:04 PM »
Nope, there is almost no correlation between input levels and power consumption.  Gain is not significantly correlated with current draw in a typical opamp design (for a discrete design, it could vary with gain).  High output levels may draw more current, but that depends on the load as well.  Headphones, yeah that makes a big difference; a 10K line load, hardly any difference at all.

Thanks for the reply. I'll be honest, though. That went completely over my head.

I'm testing 3 7800 mAh lenmar l-series li-ions for runtime. They are all just shy of a year old, and I'm trying to decide if I should invest in a few more cells and chargers to take me through a 3 day festival...


Offline tim in jersey

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Re: SPL levels and preamp battery life
« Reply #2 on: August 11, 2011, 11:30:43 PM »
BTW, the "testing" consists of running MK4>kc5>cmc6>xlr>SD 722 (low sensitivity/gain cranked to max) recording me snoring, and the ceiling fan while I'm at work...

 

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