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Multi-Way Conventional loudspeakers with crossovers

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Old 1st January 2013, 01:02 PM   #11
tvrgeek is offline tvrgeek  United States
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I would say yes, you could use a series resistor and a cap without blowing up the amp or driver. I will still advocate a complete crossover. You have not described your cabinet so we have no idea what kind of response you are actually getting due to baffle strep.

IMHO, Looking at their spec sheet, this may be a great driver at the price point, but I would spend a lot more money on the driver if it were my project. Might head over to ZAPH and read a bit about his testing. Your full ranges are much better than a $9 US. tweeter. You get a major improvement at $30 and again at $60. After that, you should be in the real high end and improvements are expensive for smaller and smaller returns.

I don't care for L-pads in my final designs. I use them for prototyping, then go to series resistors and recalculate the cap. Smaller cap, one less part. Everyone has their own preferences here. Resistors are cheap.

As a side note, I don't know CSS drivers, but their LD25X tweeter may be worth a serious look.
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Old 1st January 2013, 01:08 PM   #12
tvrgeek is offline tvrgeek  United States
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You may notice on the CSS site a kit using this tweeter. No details though.
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Old 1st January 2013, 03:36 PM   #13
sreten is offline sreten  United Kingdom
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http://creativesound.ca/pdf/CSS-ERT26-data-260310.pdf


Hmmm.....

If that 6dB dip around 10KHz to 12KHz is for real its going
to be very difficult to bring it in at 10KHz as a supertweeter.
(Without the bump below getting very much in the way.)

How they can call that response flat is beyond me.

rgds, sreten.
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Old 1st January 2013, 10:11 PM   #14
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Quote:
Originally Posted by portreathbeach View Post
Using an online calculator, the cap size for 10KHz cross would be 1.98uF and to get the speaker attenuation matched with the an L-Pad would require 3.99 ohms series and 8.03 ohms parallel for a 6dB attenuation.
EL70 is sort of a CHP with 2 magnets (and a different spider i believe)

I'd not do it that way. With only a 1 uF cap you will also have 6 dB attenuation at 10k, which is probably XOing the tweeter too low. The method that puts the XO higher also means that on the low end, the tweeter has quite a bit higher impedance.

dave
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Old 1st January 2013, 10:15 PM   #15
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So you mean, to leave the L pad as it is an put a 1uF cap in series?

Using a 1uF cap puts the crossover point at 20KHz, is that right?
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Old 1st January 2013, 10:21 PM   #16
sreten is offline sreten  United Kingdom
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Hi,

The best supertweeter candidate I can find is the Dayton ND20FB-4,

Click the image to open in full size.

Flat to beyond 30KHz, and no impedance peak to worry about,
so simply attenuate with a series R and x/o with a cap using
the total series resistance to calculate the capacitor value.

If you later go for a proper x/o, its also good for a 3 to 4KHz x/o.

rgds, sreten.
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Old 1st January 2013, 10:28 PM   #17
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Quote:
Originally Posted by portreathbeach View Post
So you mean, to leave the L pad as it is an put a 1uF cap in series?

Using a 1uF cap puts the crossover point at 20KHz, is that right?
Start with a 1uF capa nd ditch the L-Pad. It will provide the XO at 10k with 6dB of attentuation -- i think 1 uf is likely too big and that a 0.6 and a handful of 0.1 would be a better start.

The L-Pad seems to get used by people that can't get their head around the cap-only method.

dave
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Old 1st January 2013, 10:48 PM   #18
sreten is offline sreten  United Kingdom
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Hi,

The cap only method works with a high x/o point but may be too much for
young ears, for the rest of us it probably will be fine for a supertweeter.

Basically you just adjust the 1st order x/o point so the treble sounds
balanced, down if its not enough, up if its too much, and the range
of the adjustments depends on the drivers relative sensitivities.

I don't agree it works well with very high senstivity tweeters,
here you should also attenuate and play with the x/o point.

rgds, sreten.
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Old 2nd January 2013, 12:12 AM   #19
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Quote:
Originally Posted by sreten View Post
I don't agree it works well with very high senstivity tweeters
Works very well with T900 & FE206eSR. Nominal XO point up around 50k.

dave
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Old 2nd January 2013, 07:25 AM   #20
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I think I see what your talking about know. Use a simple cap so the crossover point is a lot higher than you think you need (say 20KHz), and because the tweeters dB/w is higher than the main driver this will attenuate the signal from 20KHz and under, no need for an L-Pad, right?

Any thoughts on the Vifa XT25SC90-04
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