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In Reply to: RE: Do I need tweeters ta all? posted by Gandra1 on October 16, 2010 at 08:25:10
I liked Art's answer about air noise, he is correct too.
Assuming the speaker is otherwise behaved, you would still want to add at least one tank circuit to damp out that rise around 3200Hz. That bump will be audible, the same could be done for the bump around 10K, the cost is generally an R and L and C for each bump you smooth.
Also, an on axis response curve will describe what you hear on axis but often enough, one is hearing sound from off axis too. If the speakers had a similar HF response say 10 or 20 degrees off axis, then it would possibly make a nice speaker.
Best,
Tom
Follow Ups:
...regarding L,R,C? Still didn't hear any opinion on tweeters yet.
Edits: 10/16/10
Hi
An exact solution requires the amplitude response and impedance curves as data files. Lacking that, using the plot's legend, an approximation would be;
.125 millihenry (1/8 mH)in parallel with 20Mfd polypropylene and in parallel with a 6 Ohm 10 W resistor. Those three parts in parallel are then put in series with your speaker.
If you want to raise the frequency you notch, reduce the C value a little, if you want a deeper notch, increase the R value.
Have fun
Tom
The values totally depend on what the impedance is-at the freq of interest-not the "rating" of the driver.
The values will be different for 8 vs 12 vs 16 ohms.
If it is a full range driver, most probably everything over that valley at around 5K is no good, cut it there and add a tweeter from 6k....
I like beyma Cp21f...or Raal.
JMHO
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