The proper phrasing depends on whether “1400 Sound...” is a formal product name or a descriptive label.
General rule for articles with numbers:
The Ultimate Guide to the Warner Bros. Sound Effects Library: 1,400+ Iconic Sounds Warner Bros. Sound Effects Library -1400 Sound...
The Warner Bros. Sound Effects Library is a legendary collection that serves as the sonic DNA of American animation. Released in collaboration with Sound Ideas, this library features over 1,400 digitally remastered sound effects—many of which are synonymous with the golden age of Looney Tunes. The proper phrasing depends on whether “1400 Sound
“Warner Bros. Sound Effects Library – 1400 Sound Effects” this library features over 1