tresch said:
Hello Tresch,
do you mean that you placed the blue tack on the back face cone?
Also, did you use the same volume setting when doing the without and with added mass measurement?
Yes, blue tack to the underside of the back side of the cone, so the marks don't show on the completed speaker.
And yeah I used all the same settings, doing back to back tests free air and with added mass, without changing any settings.
Perhaps the tack is not a rigid enough connection by itself or something. Seems to stick solid enough, none of it has ever come off.
Has anyone used this method running the speaker directly from the sound card, as opposed to running it through an amplifier (and then subsequently through a voltage divider)
And yeah I used all the same settings, doing back to back tests free air and with added mass, without changing any settings.
Perhaps the tack is not a rigid enough connection by itself or something. Seems to stick solid enough, none of it has ever come off.
Has anyone used this method running the speaker directly from the sound card, as opposed to running it through an amplifier (and then subsequently through a voltage divider)
I would place the added mass on the front cone side, to check if it solves the problem. Keep in mind that the Vas doesn't need to be extremely accurate.
I measure the T/S parameters without an amplifier, no problem till now.
I measure the T/S parameters without an amplifier, no problem till now.
Regarding Unibox:
The "standard design" section lists a typical "standard" box, calculated from the driver parameters you entered.
As someone else pointed out, the "design by vb, fs, vas" etc section lists the parameters of the last box designed, not the new "standard" box. For a good starting point, copy the "standard" parameters down to the "Design by vb...." section.
Next, for a sealed box select "optimise VB for given Q (usually q=0.707)" button.
For a vented box, select "Optimise FB for given response peak (usually peak = 0 db)" button.
Now tweak from there.
The "standard design" section lists a typical "standard" box, calculated from the driver parameters you entered.
As someone else pointed out, the "design by vb, fs, vas" etc section lists the parameters of the last box designed, not the new "standard" box. For a good starting point, copy the "standard" parameters down to the "Design by vb...." section.
Next, for a sealed box select "optimise VB for given Q (usually q=0.707)" button.
For a vented box, select "Optimise FB for given response peak (usually peak = 0 db)" button.
Now tweak from there.
claudio said:
Not extremely accurate, but the numbers I'm getting are a tenfold difference. Completely and absurdly out of whack. One half of a cubic foot, from the factory, to 5 one-hundredths of a cubic foot, by the software. SOMETHING IS AMISS.
I'm going to build a simple test sealed box and see if that's as far out of whack. Maybe it's something else giving me a problem, like I had a bad calibration somewhere
It's very difficult to diagnose your problem without seeing all of your inputs into the program and your test setup. If you do it properly, you can get very repeatable accurate results with SW.
Start a new thread, post your impedance traces and your driver information screen - perhaps you just have a units issue...
Start a new thread, post your impedance traces and your driver information screen - perhaps you just have a units issue...
Bwahahaha I'm a retard.
This is, however, an instance that I'm glad that I'm just a retard, and it's not some obscure confusing problem problem.
The scale I was using was measuring GRAINS, not GRAMS. *facepalm*
1 gram = 15.4323584 grains
that's... well... that's just that, is what that is.
Everything's looking good, now 🙂 Thanks for putting up with me!
This is, however, an instance that I'm glad that I'm just a retard, and it's not some obscure confusing problem problem.
The scale I was using was measuring GRAINS, not GRAMS. *facepalm*
1 gram = 15.4323584 grains
that's... well... that's just that, is what that is.
Everything's looking good, now 🙂 Thanks for putting up with me!
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