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Here are 2 speakers.
Jbl Vs. TannoyBoth are 8 ohms.
One is 87db
The other is 91db .
What makes a speaker have such a difference in sensitivity ?
How does this affect speaker to amp matching ?
Why aren't they the same if both are 8 ohms. ?
Follow Ups:
The impedance (8 ohms) is just one of many variables in speaker design. It is like looking at two cars. Both may have 6 cylinder engines but the speed, acceleration, gas mileage, handling and every other characteristic about the cars can be different.The efficiency of a speaker varies with driver design, cabinet size and design and the crossover. Also, the impedance itself will not be exactly the same. What you normally see is a "nominal" impedance but the actual impedance will vary with frequency. The deviations from nominal impedance are very likely different between the two brands.
It is important that you match an amp to ALL of the characteristics of a speaker. Don't get caught up with overly simplistic single issues.
That’s the part I don’t understand. Normal Impedance.
When they say 87 db. What freq. are they talking about ?
1000 Hrz ?
For a simple definition of nominal impedance, see http://www.answers.com/topic/nominal-impedanceTo compare two speakers specifically, you will need a graph where the impedance has been plotted against frequency.
The 87 dB sensitivity figure is usually derived using broadband white or pink noise and usually refers to the sound volume generated by 1 watt of power to the speaker measured 1 meter away from the speaker.
Is 1 watt at 1 meter still standard? I believe the change minimal requirements for test to boost ratings on equipment. Like your 500 watts big chain store systems. They need to put out 500 watts for one second. I personally like to rock to clean music allnight long. "All night" Wow Lionel where did that come from.
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