Why Amplitude of PWM signal reduces after Filtering operation

Hi,
I need help to solve this problem, As I'm acquiring sine modulated PWM signal & performing filtering operation on it to remove the pulses & obtain a pure sine wave of 6oHZ, in this process the amplitude of the filtered signal is reduced considerably from 300V to 40V.I would like to know why is this happening & to avoid this what can i do.
I've attached the pwm signal , the filtered signal & the Block diagram of filter..
Please help me out
Thanks in advance
sayaf

I've attached the pwm signal , the filtered signal & the Block diagram of filter..
Attachments:
PWM+Filtered.zip ‏20 KB

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