Tweeter magnet size & efficiency. Advice please - diyAudio
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Old 16th April 2017, 07:00 AM   #1
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Default Tweeter magnet size & efficiency. Advice please

I am led to believe that putting a stronger magnet into a tweeter can allow the designer to create a tweeter with a higher top-end frequency response, (eg raising it from perhaps 18kHz top to 20kHz), at the expense of a little efficiency (eg dropping efficiency from 91db by one or two dB).

I realise that the coil size, dome size and material, etc all have a huge part to play in this as well, but as a rule, could anyone confirm that the statement above has some truth in it?

Many thanks for any advice that you can give!
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Old 16th April 2017, 12:29 PM   #2
Ron E is offline Ron E  United States
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No truth at all. A larger magnet gives more Bl, which means more sensitivity. The Qes will also drop, dropping Qts, and potentially causing low frequency droop, requiring a slightly higher crossover point.

The high frequency response rolloff is basically cone/dome breakup related. Only the low frequency area is affected by Qts (magnet size). More magnet gives a lower Qts, and vice versa.

One way to get a little more top end is to put a resistor and cap in parallel, then put the combo in series with the tweeter. This doesn't raise the top end so much as shelve down the low end of the tweeter response. This will only work, obviously, if the tweeter is originally more sensitive than the speaker it is paired with...
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Old 16th April 2017, 06:10 PM   #3
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Thank you, Ron, that's useful information. Cheers.
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