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Old 8th May 2013, 07:05 PM   #1
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Default How is This Possible???

How can this speaker run on portable power consisting of 8 AA's batteries?

is it 3 watts? does it have a hidden 12V SLA battery? or does it run for 10 minutes?

I don't get it?

410mA draw?

Current Draw 410 mA

Expected battery life under continuous use Alkaline: approx. 8 hours (MAX), approx. 12 hours (ECO)
Nickel-metal hydride: approx. 10 hours (MAX), approx. 15 hours (ECO)
* These figures will vary depending on the actual conditions of use

BA-330 :: Products :: Roland


Roland BA-330 Stereo Portable PA System | Musician's Friend
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Old 8th May 2013, 07:59 PM   #2
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Yeah, it's a very efficient 2-channel class D or T 5 watt mostly vocal speach P.A. using small efficient speakers and horns, without much bass. Average power is probably a fraction of a watt, thus the optimistic battery life figures. Now if you play compressed music loud then battery life will be very very poor. The power supply is 12 V but the 8 AA give 17.6 at 2.2 each X quantity 8. It appears to be stereo.

Could be cool for a street performer with an Optima car battery.
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Old 8th May 2013, 08:00 PM   #3
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That's a LOT of money, because of the built-in DSP and the feedback destroyer.
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Old 8th May 2013, 08:04 PM   #4
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You notice it takes "battery pack for quick reload"... So they really expect you to have multiple batery packs and swap them.
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Old 9th May 2013, 07:43 PM   #5
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"is it 3 watts? "

Most likely: Class D bridge amp, 12W/4Ω.

http://www.e-ele.net/DataSheet/TA2020.pdf
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Last edited by djk; 9th May 2013 at 07:55 PM.
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Old 9th May 2013, 07:54 PM   #6
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They could even have a boost converter onboard too.
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Old 9th May 2013, 07:58 PM   #7
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They could, but I doubt it. The loss of efficiency of the inverter would lower the overall battery life.

I would bi-amp the speakers and get more output that way.
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Old 9th May 2013, 08:02 PM   #8
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Well they could get 95%+ from the converter I think, if properly designed, and it would also keep the voltage to the power amp constant even as the batteries start to lose charge. I doubt it too, but it's possible.
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