CREATE TABLE table_1601027_1 (headphone_class VARCHAR, us_msrp VARCHAR)
SELECT COUNT(headphone_class) FROM table_1601027_1 WHERE us_msrp = "$150"
มีคลาสหูฟังกี่คลาสที่มี US MSRP ที่ $150
How many headphone classes have a US MSRP of $150?