Acoustic feedback is one of the big problems when playing records. The cause is the sound that has just been produced by the speakers which comes back to the record player and cause it to vibrate. The problems is that there is a very slight time difference between the reproduced sound and the sound that is fed back onto the record player. This results in a big loss of detail and clarity and makes the sound muddyÂ. So every effort has to be done to isolate the record player from its surroundings as well as to isolate the record from the record player.
In order to reduce acoustic feedback from the surroundings back to the record and the cartridge a lot of effort has gone into developing turntable mats that make the reproduced sound crystal clear with great separation and detail. This has been done by experimenting with various materials which absorb unwanted vibrations which were not present in the original recording. Now many people are trying to combine these different materials as a sandwich at the same time in order to reach better results. With this mat you can experiment yourself but at modest pricing to see which mat material may sound best in your particular space.
In order to enhance the better contact between the record and the mat, the center part with the dimensions of the label have been recessed to accommodate the thicker label part.