Table: igrado_specs
Columns: headphone_model
headphone_class
driver_matched_db
construction
earpads
termination
us_msrp

Question: Which headphone models correspond to the US MSRP of $150?
SQL: SELECT "headphone_model" FROM igrado_specs WHERE "us_msrp" = '$150'

Question: Which terminations correspond to a US MSRP of $49?
SQL: SELECT "termination" FROM igrado_specs WHERE "us_msrp" = '$49'

Question: How many headphone classes have a US MSRP of $150?
SQL: SELECT COUNT("headphone_class") FROM igrado_specs WHERE "us_msrp" = '$150'

Question: How many values for earpads correspond to the headphone class Prestige and a US MSRP of $79?
SQL: SELECT COUNT("earpads") FROM igrado_specs WHERE "headphone_class" = 'Prestige' AND "us_msrp" = '$79'

Question: Which headphone models have a driver-matched DB of 0.1 and a US MSRP of $49?
SQL: SELECT "headphone_model" FROM igrado_specs WHERE "driver_matched_db" = '0.1' AND "us_msrp" = '$49'

Question: Which terminations correspond with headphone model SR80I?
SQL: SELECT "termination" FROM igrado_specs WHERE "headphone_model" = 'SR80i'