HD600 / HD650 CNC Copper Mass loading mod DIY kit

This is a copper weight which adds mass to the rear of the driver and smooths the airflow slightly. By it's self it gives more detailed bass and a little bit more sub bass. Ideally it shold be combined with the removal of the foam disk on the rear of the driver which will further improve the resolution of these, already, great headphones.

The mod can be fitted with no special tools and can easily be removed in the future

We have now also updated the kit to include 4 different foam inserts that allow you to tune the bass levels to your own personal taste whilst keeping the extra bass clarity and detail you get from adding the mass loading weight