cartiage for Kenwood L07D genuine tone arm

I received it last weekend.
I found its sub weight should be attached to the arm for more choice of cartridges.
Does it change the effective mass of tonearm?

I received turntable last weekend
According to manual,I found the sub weight should be attached to the arm for the cartridge heavier than 9g
Does it change the effective tone arm mass?

09-27-15: Jagdzaku
I received turntable last weekend
According to manual,I found the sub weight should be attached to the arm for the cartridge heavier than 9g
Does it change the effective tone arm mass?

No it doesn't. The effective mass is the mass or weight of the tonearm from its pivot to the headshell.

The extra counterweight enables you to balance a heavier cartridge. The counterweight doesn't add effective mass, but the cartridge does.

You have to factor in the weight of the cartridge plus teh tonearm's effective mass to arrive at the total effective mass.

thanks for reply
I might uses a EMT JSD or lyra kleos on it
hope they can work well

As with cartridge weight, the mass and distance of the counterweight from the pivot point certainly changes the effective mass/inertial mass of the combined system.