How is This Possible???

[johnviera]

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

 

[cyclecamper]

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.

 

[cyclecamper]

That's a LOT of money, because of the built-in DSP and the feedback destroyer.

 

[cyclecamper]

You notice it takes "battery pack for quick reload"... So they really expect you to have multiple batery packs and swap them.

 

[djk]

"is it 3 watts? "

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

http://www.e-ele.net/DataSheet/TA2020.pdf

 

[5th element]

They could even have a boost converter onboard too.

 

[djk]

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.

 

[5th element]

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.