Question: Name the number of headphone class for SR100
SQL: SELECT COUNT("Headphone Class") FROM "1-1601027-2" WHERE "Headphone Model" = 'SR100';

Question: Name what succeeded by for Foam
SQL: SELECT "Succeeded by" FROM "1-1601027-2" WHERE "Earpads" = 'Foam';

Question: Name the headphone model for succeeded by SR125
SQL: SELECT "Headphone Model" FROM "1-1601027-2" WHERE "Succeeded by" = 'SR125';

Question: Name the driver matched db for Joseph Grado Signature
SQL: SELECT "Driver-matched dB" FROM "1-1601027-2" WHERE "Headphone Class" = 'Joseph Grado Signature';