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RE: Efficiency & Resistance

"It would seem that this amplifier has its best performance at 4Ω."

I disagree.

Damping may quell oscillations in some speakers with oscillation problems or inappropriate cabinet design, but does it not describe how well the amplifier will work or sound with all speakers to merit such generalities.

If the speaker/cabinet combination is sufficiently dampened mechanically, then it means very little with typical high impedance speakers.

It means more to sloppy high excursion-low impedance woofers that need the negative feedback to help control the woofer. These have looser suspension and soft surrounds. The voice coil has less turns so it makes a weaker electromagnet then a comparable high impedance coil.

This aligns with what I said about the challenges to building a current type amplifier. The negative feedback is an attempt to correct the inherent flaws of such topologies, the lack of grip on the voice coil.

If you short the terminals on an 8 ohm and a 16 ohm speaker that are otherwise the same, you will find it harder to push the cone in on the 16ohm speaker. That is because it has a better motor, these motors will be more responsive to changes in voltage.
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  • RE: Efficiency & Resistance - Garg0yle 23:39:16 02/14/15 (0)

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