A good subwoofer driver consists of:
- a sturdy, rigid resonance free basket,
- a hard and rigid diaphragm with little resonance,
- a matching drive system (voice coil within the magnetic field).
But, what is a matching drive system?
A well matched drive system shouldn't be too strong or too weak. This is
made clear by the following picture showing the Alcone AC 12 SW4 in a closed
cabinet. The drive has been weakened by resistors.
You will notice that the flattest frequency response (same volume between
50 and 200 HZ) occurs when a dropping resistor of 6 to 8 Ohm is used.
The same flat frequency response can be achieved by using a weaker magnet.
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