Defects
Undamped moving iron speakers suffer the following defects:
- Gross non-linearity and consequent harmonic distortion
- Heavy intermodulation distortion
- Little bass response
- Poor treble response
- Strong undamped resonance at a few kHz
- Gross impedance mismatch
- Prone to demagnetisation
Antique pre-war moving iron speakers also suffered the following defects:
- With cone speakers, tendency of the moving iron to stick to the pole piece, resulting in a 'whack' sound followed by very little sound output.
- Noisy chattering when presented with a loud bass note
- Need for adjustment
- Horn loudspeakers (popular at the time) were directional
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