In regards to your question, we manufacture various motor products which are typically used in industrial applications. In these types of applications, the noise specification is not a main consideration for the application. Furthermore, the noise generated may be dependent on the speed, load, and gearing of the motor. For these reasons, the dB rating of our motor products is not shown. Since this value is not shown, it would be difficult to compare your current BXS460C-A-3 system to one that would be quieter.
For further information on how the motor speed and gearing affects the noise generated, you can also reference this Forum post:viewtopic.php?f=23&t=561&p=824&hilit=noise+rating#p824
For my reference, why was the BXS460C-A-3 package originally chosen? Do you control the speed of the table, or is the speed set and you are looking for a good value of speed regulation?