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Multi-Way Conventional loudspeakers with crossovers

First order crossover
First order crossover
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Old 11th July 2019, 03:59 AM   #1
oon_the_kid is offline oon_the_kid  Malaysia
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Default First order crossover

Hi,

I've been thinking of adding a supertweeter of sorts to my full range system.
The tweeter I am thinking off is the dayton audio.

AN25Ti-4 1" Titanium Dome Neodymium Car Audio Tweeter Pair 4 Ohm Specification Sheet

I am thinking of just adding a first order filter at 10kHz to my tweeter.

The question I am asking is this, is 1st order too low? Normally they require 2nd order at about a few kHz. I was just thinking of maybe 4uF in series, what do you think?

Oon
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Old 11th July 2019, 04:09 AM   #2
Tromperie is offline Tromperie  Australia
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I would ask other question first, such as;
Will I be able to hear the difference?
Will I be able to hear it at all?
What will it do to the impedance of the speaker crossover?
Will it blow my amps from the question above?
Do I really want to mess with a system that works, with unknown consequences?
Is it going to worth the trouble?
Among others.

Sorry, I don't want to put the kybosh on your playing, however..........................
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Old 11th July 2019, 06:00 AM   #3
picowallspeaker is offline picowallspeaker  Italy
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Supposedly, a supertweeter should have a very exceptional frequency extension, well beyond 20 kHz.
To have a light and rigid membrane, and little dimension...it's quite rare.
Some use piezotweeters for this
That's my knowledge on the matter
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Old 11th July 2019, 06:09 AM   #4
schiirrn is offline schiirrn  Germany
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The tweeter has it's resonance at about 1.8kHz. Crossing it at 10k 1st order shouldn't be a problem. Impedance at 10k is about 3.6 Ohm, so a capacitor between 4 and 4.7uF will do.
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Old 11th July 2019, 06:25 AM   #5
oon_the_kid is offline oon_the_kid  Malaysia
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Quote:
Originally Posted by picowallspeaker View Post
Supposedly, a supertweeter should have a very exceptional frequency extension, well beyond 20 kHz.

To have a light and rigid membrane, and little dimension...it's quite rare.

Some use piezotweeters for this

That's my knowledge on the matter

You are right in this part. However the the frequency response still appears flat at 20KHz. So it should be more, but how much more is another matter ....

Oon
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Old 11th July 2019, 12:39 PM   #6
Galu is online now Galu  Scotland
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Quote:
Originally Posted by oon_the_kid View Post
how much more is another matter ....
A true super tweeter can reproduce up to 35, 40 or even 50kHz so the car audio tweeter can hardly be classed as a super tweeter.

The frequency response graph of the car tweeter shows the off-axis response drops off from 10kHz, being as much as 12dB down at 20kHz.

I do agree that a 4μF film capacitor is a suitable starting point for experiment for incorporating a 4‎Ω super tweeter (use 2μF for an 8‎Ω one).
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Old 12th July 2019, 06:05 AM   #7
oon_the_kid is offline oon_the_kid  Malaysia
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Actually my concern is if there would be over excursion for the tweeter, but thinking it through again I think it shouldn't be a problem.

If I wanted to go all the way, I would use a ribbon, but they are not in my price range.

Oon
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Old 12th July 2019, 06:52 AM   #8
wiseoldtech is offline wiseoldtech  United States
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I'd love to actually meet someone, human, from this planet that can actually hear 20Khz.
And additionally, tell me of a music recording that contains such a frequency.
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Old 12th July 2019, 07:05 AM   #9
oon_the_kid is offline oon_the_kid  Malaysia
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Actually, I've tried before. Kids and teenagers... they can hear to at least 17-18kHz...
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Old 12th July 2019, 07:07 AM   #10
scottjoplin is offline scottjoplin  Wales
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Have you considered angling it towards the ceiling to get a wider dispersion at high frequencies and also reduce any comb filtering effects with the main tweeters?
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