amplify low frequency signal

[lalalala]

Hi,
Not sure if this is the right place to ask this question.
I am trying to amplify a 0-1000 Hz sin signal to drive a 8 ohm EM load. I need the output power to be at least 20 W. Can a class D handle the job?
I saw all the specs only go down to 20 Hz.
Also, I would like the output to be zero if the input is zero.

Perticularly, can this

http://focus.ti.com/lit/ug/slou208/slou208.pdf

or this

http://focus.ti.com/lit/ug/slou210/slou210.pdf

work?

Thanks a lot in advance.

 

[Th3 uN1Qu3]

The amps have input coupling capacitors. By increasing the value of those you can lower the low frequency cutoff. It shouldn't be a problem getting linear response down to 1Hz but you will also have to increase the power supply capacitance to have the amp deliver full power at such a low frequency.

 

[Pafi]

Can a class D handle the job?

Yes, but you need a DC coupled, bridged amplifier.

 

[ChocoHolic]

...and Pafi is not just joking.
Full bridge is a key for DC-signal-applications, otherwise you will suffer from heavy rail pumping.
(A half bridge topology for DC-signals would demand a power supply, which can source and sink - normal power supplies can source only.)

 

[lalalala]

Thank you guys!

 

[sathit dokmadue]

Thank you.