For the DL103 and R you want an arm of at least 16grams effective mass. If you look through the spec chart on every arm you might consider, you'll find how the manufacturer rates its arm for mass. But keep in mind that an arm of lower mass can usually be increased simply by adding a head weight between the cartridge and headshell. Additionally, many arms are offered with add-on weights for the counterweight end. This allows you to accommodate cartridges like the DL103 which have stiff suspensions that require more weight over them to keep the stylus in the groove.
16G to 20G for the DL103R.
There is more to know but this is the short version for matching up arms and cartridges. Additionally, you can calculate at what frequency a given arm and cart match-up will resonate by a short formula. The idea being to have the arm/cart system resonate between 8hz and 12hz.
Here's a link to a page with more info on this subject:
http://www.theanalogdept.com/cartridge___arm_matching.htm
-Steve
16G to 20G for the DL103R.
There is more to know but this is the short version for matching up arms and cartridges. Additionally, you can calculate at what frequency a given arm and cart match-up will resonate by a short formula. The idea being to have the arm/cart system resonate between 8hz and 12hz.
Here's a link to a page with more info on this subject:
http://www.theanalogdept.com/cartridge___arm_matching.htm
-Steve