This collection of 5 different riser sound effects is tuned for different types of contexts . You can download and use them legally and entirely for free in any kind of trailers, teasers or even logo reveals, no attribution required!

Download at Audiosome: 
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Risers Pack - Totally Free Audio Assets by Audiosome

Audiosome is your library of high-quality audio assets and music by professional musicians, DJs and audio artists. Use the audio assets you need for your video and music projects entirely for free, modify them as you want, share what you have created and help spread the word. Audiosome is powered by you and it belongs to you!