solderdude
Grand Contributor
It is only rated 150W when fed through a correct XO filter, the actual voice coil most likely cannot handle 150W (program power?) it is designed to be used with 150W amplifiers..
I see, I only use TPA3116d2 amp kit, (zk-tb21) rated 50watt x2 and 100watt for sub. So, I guess shld be ok.It is only rated 150W when fed through a correct XO filter, the actual voice coil most likely cannot handle 150W (program power?) it is designed to be used with 150W amplifiers..
Is adding a capacitor not enough ? what is the correct frequency ? Is it possible to tell just by what I have posted ?You are only O.K. if high pass filtered at the correct frequency and order.
I cannot find info about the actual power rating of the voice coil.
I am using it with only a 4" full range speaker driver without crossover. And a 6" subwoofer, a 2.1 amplifier kit using dual tpa3116d2. I have posted a measurement video of the fullrange I use in previous page.Hard to say as there is not really enough info on this tweeter.
Is it used with a full range speaker, a 2-way or 3 way system ?
Is it used as a super tweeter (on top of an existing speaker) ?
A single capacitor may work well but depends on several factors as mentioned above.
One may ignore the LF driver rolloff part of the calculator.Interesting calculator, I don't actually use a woofer since the bass is from a 2.1's sub, but I have the tweeter connected parallel to a 4 inch full range, also 8 ohm, with no crossover and open baffle. I'm currently using a 6.8uF capacitor and judging from the measurement of the calculator, the frequency is around 3khz and if I want 20khz, 0.9uF can be used. Good to know.
I didn't want to edit my earlier post again, but I do want to acknowledge @solderdude's advice, which is sage.Might be best to use a 1st order low-pass on the full range driver too and turn it into a 2-way system.
Now the full range is emitting high frequencies which will likely 'comb filter' with those of the tweeter.
I would recommend to crossover at a frequency where the full range starts to beam or show 'ragged' response.
Could well be in several kHz region in which case 1st order (just a cap for the tweeter and just 1 inductor for the wide-range) will do just fine.
Or a variable L-padFirst of all, a calculator is just that. This one only gives vaguely accurate results if both drivers have the same sensitivity, which is almost certainly not the case. You would have to include an extra series resistor for your tweeter both in real life and in the tweeter impedance field.
Perhaps look for inductors on loudspeaker websites.So. if my fullrange has this kind of measurement. And I decided to crossover at 14.7khz where it starts to go down
View attachment 402461
And using the calculator posted by mhardy6647 on previous page, I should use a 1.35uF capacitor
View attachment 402463
So I combine my 1uF+0.22uF+0.1uF = 1.32uF (close enough)
View attachment 402464
Am I doing it 'somewhat right' or am I embarrasing myself lol ?
But I kinda like how it sounds though.
And What is :
Inductors
L1 = 0.09 mH ??
Is the item in this picture usable ? And what does it do ? Reducing the high above 14.7khz from the fullrange because it's handled by the tweeter ?
View attachment 402465
Gimmick caps are good for a couple of picofarads at most, which in some applications, is enough.1a) capacitors "exist" (i.e., are purposefully manufactured) into the range of low picofarad values (1 uF = 1E6 pF).
1b) This is a capacitor that can exist even if not purposefully manufactured (i.e., for-profit manufactured).
View attachment 402254
2) It's all relative! I.e., a very high (i.e., ridiculously high) first order XO isn't as absurd as it might seem. For example, the "supertweeters" on my Altec-esque loudspeakers have first order XO using a 1 uF Sprague "Atom" capacitor. That is a nominal XO frequency of 20 kHz for an 8 ohm load! The drivers are very sensitive, and the slope of the XO is only 6 dB per octave, so there's plenty of output (- 6dB, nominally) at 10 kHz ... and even below.
EDIT: Here's a handy first order XO calculator:
2-Way Crossover Calculator / Designer
Design a 2-way high / low pass crossover with a range of choices for type and order.www.diyaudioandvideo.com
View attachment 402258
Yea I'm outside the US, I think it already sounds fine now with the calculator you posted earlier, using 1.32uF even without adding the 0.09mH inductor, or like other said it's small enough to be negligible.@jst if you're in the US, here are two reasonable, and reasonably easy, sources of good inductors for XOs, if you wish to experiment with attenuating the HF output of your "fullrange" driver.
Crossover Inductors
Shop Crossover Inductors in air core, copper foil, and solid core styles at Parts Express. Shop brands like Dayton Audio, ERSE Audio, Jantzen Audio, and more.www.parts-express.comInductors: Speaker Components & DIY Audio Parts | Madisound
Speaker drivers, kits, and audio components for DIY speaker building. Browse woofers, tweeters, crossovers, and complete speaker kits from leading manufacturers.www.madisoundspeakerstore.com
If you're outside the US (and my sense is that you may well be), I am sure there are similar resources of which you may avail yourself.
Using the 2way calculator, if I XO at around 6khz, should I then cut the fullrange's 6khz and above ? Because the fullrange can play to like 17kHz but starting to go downslope at 14.7khz.I would recommend to XO at around 6kHz or so as the treble quality starts to matter there.
That will be fine in first order filtering.
Also you would probably want to know the sensitivity (or efficiency) of both speakers.
Is this it ?
Do you mean you prefer to not attach any crossover to your midrange ? Meaning it should sound as is without adding any xo.I am - still - a fan of keeping crossovers (at least passive XOs) out of the midrange if at all possible, and as much as possible.