No, acrylic platters do not need a mat. The VPI tables don't use one , neither did the Basis Ovation I use to have. I do not believe the Raven tables two of my friends have use one either. The question of whether one would be of sonic benefit I will leave to others. But you do not need one.
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the original intent of acrylic platters was to clamp the LP directly on them without a mat - essentially making the cartridge "think" it's riding on a 1" thick LP (or so I read somewhere). I found that using a Funk Achromat on my acrylic platter does provide some sonic benefits. Funk recommends not using a clamp with the achromat which makes it a little more convenient too.
It never hurts to experiment if you have the time.
Statements such as "No, acrylic platters do not need a mat" are absolutes and generally need to be ignored as theyre born out of inexperience.
Whether or not a mat will be beneficial is a factor of other considerations. Among them, the turntable itself, tonearm, cartridge, existing isolation/vibration control, and your personal listening preferences.
Also ignore "News Alert: Acrylic platters are now obsolete". That's just plain stupid.