Xover to add super-tweeter in a 3 way loudspeaker, I have laying around a couple of Focal TC120TDX2 that I want to use as super tweeter in my current 3 way system. Need help for suggestions what frequency to cross them, attached xover used in the current 3 way loudspeaker & Focal datasheet.
FR two loudspeakers smoothing 1/3
IR two loudspeakers
What about using a xover at 15kHz 2nd order 12dB/octave 3dB slope @ fx?
FR two loudspeakers smoothing 1/3
IR two loudspeakers
What about using a xover at 15kHz 2nd order 12dB/octave 3dB slope @ fx?
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Unless it's positioned in the very nearby, it will be barely audible. That's why the usual supertweeters are high sens/High eff. with L-pad or transformer/autoformer.
Try to position a waveguide ( it can be made with a cone of a dead speaker ) on the tweeter and see how it gains. For Fc=10 kHz its diameter being 344/10000=3,4 cm WL
Try to position a waveguide ( it can be made with a cone of a dead speaker ) on the tweeter and see how it gains. For Fc=10 kHz its diameter being 344/10000=3,4 cm WL
Thank you I will try. Slope 3 or 6dB?
Another view on the seas design : a) resistor in series b)a lowpass?
Between the attenuation resistor R1 and the tweeter is a filter for time delay alignment
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Here's what I have done in the past. I have plenty of capacitors and inductors in my parts boxes which obviously helps! Get a variable L-Pad and some inexpensive capacitors and a few inductors. Calculate L and C values for X/O's at say 8 KHz, 10 KHz and 12 KHz for starters. Do this for 1st order and second order X/O both. Pick a place to start; usually the highest frequency first and do listening tests using a capacitor only (1st order). Start adding capacitors in parallel, these can be low value like 0.22 uF, 0.33 uF, 0.47 uF, etc. one at a time while doing listening tests. If you get to the point where you think the tweeter is adding too much output, try an inductor for 2nd order. I use alligator clip leads to quickly allow connecting and disconnecting capacitors and inductors. Also, tweeter polarity may be an issue depending on what X/O freq. and slope you end up with. You can use a DPDT switch to quickly reverse polarity. It helps if you have a partner do these things for you while you sit in your "normal" listening position. Based on my hearing loss and others; I would also say to start at about 12 KHz, then 10 KHz, etc. If I were to guess, you will probably end up with 2nd order, 12 KHz, reverse polarity; with little to no L-Pad attenuation. Regardless of what others may say or think; it has helped "ME" get the most out of the top octave by experimenting in this way. Once you have this all fine tuned to "YOUR" personal taste and listening preference; replace the adjustable L-Pad with high quality fixed resistors and the caps. and coils with a higher quality as well. Of course, if you have access to test and measurement equipment, calibrated microphones, etc. you can do these experiments in a much more scientifically correct manner. In my case it doesn't matter; what I need is top octave boost based on listening tests that match "MY" hearing loss. Again, everyone's tastes are different, everyone's hearing loss is different; do not be afraid to experiment.
And is your opinion based on the extremely simple test needed to test it blind by simply having a buddy turn the super-tweeter on and off? Could the placebo effect (for want of a more pejorative term) be alive and well?
Dick Hertz: +1... you're asking the right question.
Not always an improvement in SQ to enhance top or bottom end without simultaneously enhancing bottom and top end.
B.
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