grado labs
the average impedance for the grado labs headphones is around 33 ohms .
{'scope': 'all', 'col': '4', 'type': 'average', 'result': '33', 'subset': None}
{'func': 'round_eq', 'args': [{'func': 'avg', 'args': ['all_rows', 'impedance ( ohms )'], 'result': '33', 'ind': 0, 'tostr': 'avg { all_rows ; impedance ( ohms ) }'}, '33'], 'result': True, 'ind': 1, 'tostr': 'round_eq { avg { all_rows ; impedance ( ohms ) } ; 33 } = true', 'tointer': 'the average of the impedance ( ohms ) record of all rows is 33 .'}
round_eq { avg { all_rows ; impedance ( ohms ) } ; 33 } = true
the average of the impedance ( ohms ) record of all rows is 33 .
{'eq_1': 'eq', 'result_2': 'true', 'avg_0': 'avg', 'all_rows_3': 'all_rows', 'impedance (ohms)_4': 'impedance ( ohms )', '33_5': '33'}
['headphone model', 'headphone class', 'sensitivity ( db )', 'impedance ( ohms )', 'driver - matched db', 'construction', 'earpads', 'termination', 'succeeded by']
[['sr40', 'unknown', '100', '32', 'unknown', 'plastic', 'foam', '1 / 8 ( 3.5 mm ) plug with 1 / 4 adaptor', 'igrado'], ['sr325', 'prestige', '98', '32', '0.05', 'aluminum alloy', 'bowls', '1 / 4 ( 6.5 mm ) plug', 'sr325i'], ['hp1000', 'joseph grado signature', 'unknown', '40', 'unknown', 'aluminum alloy', 'flats', '1 / 4 ( 6.5 mm ) plug', 'no successor'], ['sr100', 'prestige', 'unknown', '32', 'unknown', 'plastic', 'flats', '1 / 4 ( 6.5 mm ) plug', 'sr125'], ['sr200', 'prestige', 'unknown', '32', 'unknown', 'plastic', 'flats', '1 / 4 ( 6.5 mm ) plug', 'sr225'], ['sr300', 'prestige', 'unknown', '32', 'unknown', 'plastic', 'flats', '1 / 4 ( 6.5 mm ) plug', 'sr325']]