@speakermaster,
It has been postulated by others on this forum in the past that the high impedance speaker's decreased manufacturing was due to,
1 The increasing availability in the 1960s of transistor amplifiers that made obtaining more watts much less expensive compared to tube power.
2 A good quality high impedance speaker is relatively more expensive to build and requires more effort. These 2 factors are said to have led the shift to 4 ohm speakers becoming more popular and the default choice.
Charles
It has been postulated by others on this forum in the past that the high impedance speaker's decreased manufacturing was due to,
1 The increasing availability in the 1960s of transistor amplifiers that made obtaining more watts much less expensive compared to tube power.
2 A good quality high impedance speaker is relatively more expensive to build and requires more effort. These 2 factors are said to have led the shift to 4 ohm speakers becoming more popular and the default choice.
Charles