How to make rockfall sound impact?

[Ruriko]

I got this rockfall sound effect and right now it doesn't like a big bang when it's fallen off a cliff. How can I make it sound like BANG!!! a large rock just fell off a cliff

[whomper]

Sometimes recordings do not sound like real life. That is why foley experts have jobs. Bacon sound frying is crinkling cellophane. Hoofbeats might be half coconut shells in the guys hands.

If this is not a trick question you need to tell us more. The sound of falling off a cliff would be nothing. Perhaps some wind rustling. If it were a person there would be a scream. But a rock falling off a cliff would be nada zip zilch.
Now if you want the sound when the rock hits something at the bottom that would depend on what it hits.

[steve]

Its largely a matter of personal preference. You could have a look on freesound.org and see what they have.

Here's an effect that I made from a "Pink Noise" sample.
Using Audacity 1.3.12 -
Generate menu > Noise > Pink
Filtered the noise with a high-pass filter set at 50Hz and a low-pass filter set to 100Hz
Amplified and applied the "Leveller" effect.
Trimmed the noise so that there was just a short burst.
Added a short fade-in/fade-out to the noise burst (to avoid "clicks")
Made a copy of the track and added a few seconds of silence to the end.
Used the "GVerb" effect to add a "canyon reverb" to the sound.
Mixed the sounds together.
Used "Hard Limiter" effect (dB limit: 6dB, Wet: 1, Residual: 0.3)
Then added in a bit of your "falling stones" sound from bigrock.mp3 (a couple of sections blended together and a bit of reverb added.)

Different noises can be produced using different types of noise and different effects settings.