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General speaker questions for audio and home theater.

Measurements, taste in music, relativity........

166.62.37.97

The MMG have a rated sensitivity of 86dB@2.83V/500Hz/1 Meter. Put in another format: 83dB@1Watt. Of course, that is a clinical measurement under controlled test conditions.

I'll get to the real world application of that figure later. First, let me point out the significance of that figure. The MMG is inefficient when compared to similarly priced cone speakers. You can pick up a decent pair of coned bookshelf speakers (stands included) for $500. Under similar conditions, the cone bookshelf speakers will measure 89db/1Watt (some are more efficient, some are slightly less, 89dB is a safe estimate). Doing the math, it takes 4 times as much electrical power for maggies to acheive a similar spl. The finer points of this hypothetical situation (i.e. sound quality, freq response) can be disputed endlessly but, the fact remains, the maggies are nowhere near as efficient as cone speakers.

Taste in music and the volume at which music is listed too are factors in this discussion of power usage. If you listen to mostly acoustical music, jazz, classical and other types of music that are not as bass heavy as rock n' roll, pop, rap, and heavy metal, then power usage is not as much of a concern. If you listen to this acoustical music at a low spl (like you would in a small room), then power usage is low; usually using one watt or lower. However, not everyone listens to acoustical music in a small room. Some people listen to classic rock n' roll in a large room. I'm not saying that my room is large but, I regularly went over 4 watts of power usage while listening to music. Also keep in mind that amplifier and, more importantly, speaker distortion increases with power usage. You can rate a speaker to take 150 Watts, but when the MMG has 9% bass distortion @ 80Hz/2.83V/5 Ohm, it can be reasonably deduced that the less power you use to reach a certain spl, the cleaner the sound will be from the speaker. It can also be inferred that more distortion is created when more power is used.

When I wrote the review, I had to take into consideration that not everyone listens to music in the same manner and in the same room. I had to provide some balance to my bias of how wonderful I think these speakers sound.

Have fun,
Tom S.


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  • Measurements, taste in music, relativity........ - Tom S. 09:40:16 04/17/99 (0)


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