MM Cartridge for VPI Scout

I used the Ortofon RED in mine, requires extra weight in headshell or lighter counterweight from VPI.

Not really a low mass arm designed for high compliance cartridges. It is about 10 grams in mass, which is about the same as the SME V and most arms of standard length and without detachable head-shells. Low mass arms have a mass of 5 grams and under, the SME III is an example. The VPI should handle anything except very low compliance or extremely high ones; the latter are about extinct. Check Vinyl Engine for arm data, they have info on almost all arms. They also have an arm resonance calculator derived from the cartridge compliance and the arm mass.

You will have to add weight to the head-shell or change the counterweight with 4g weight cartridges. Very low compliance cartridges are also not ideal although they will work. Don't confuse cartridge weight with compliance, it is the relationship between the arm mass and cartridge compliance that you have to pay the most attention to. Typically very high compliance cartridges are very light and low compliance ones very heavy but you should check the individual cartridge; most arms and cartridges currently made are medium mass and most cartridges medium compliance so they will work with each other but there are numerous exceptions. Check Vinyl Engine for a calculator to determine the arm resonance from the arm mass and cartridge compliance.