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Old 09-13-2015, 10:33 PM
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Default Any simple way to tell where a box is tuned?

How do you tell where a box is tuned? I figure I can run test tones, should I be looking for where I can feel the most air coming out of the port, or is there a better way?
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Old 09-13-2015, 10:36 PM
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If u have a computer download Torres box calc and type in all ur specs. It's pretty darn close.
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Old 09-13-2015, 11:05 PM
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You can eyeball it by watching the sub. It will move the least at tuning.

Or clamp

Or WooferTester

Or break out the tape measure and do the math
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Old 09-13-2015, 11:06 PM
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I used Winisd, but my slot port has a 90 turn at the end, and I wanted to see what that did to the actual tuning.
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Old 09-14-2015, 02:52 PM
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Quote:
Originally Posted by TaylorFade View Post
You can eyeball it by watching the sub. It will move the least at tuning.

Or clamp

Or WooferTester

Or break out the tape measure and do the math
Math was done by WinISD.

Not sure what a WooferTester or clamp is (other than the kind I used to build the box).

I could definitely eyeball the cone movement. Anyone know where to find some 25-35Hz individual test tones?
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Old 09-14-2015, 03:24 PM
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Quote:
Originally Posted by Vmax911 View Post
Math was done by WinISD.

Not sure what a WooferTester or clamp is (other than the kind I used to build the box).

I could definitely eyeball the cone movement. Anyone know where to find some 25-35Hz individual test tones?
If you have all the dimensions ill do the math for ya bro. i can help break it down for you so that in the future you can have that as another tool in your belt. win isd is a great program, i use it as well
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Old 09-14-2015, 03:27 PM
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To do this method one needs.....

1) a power amp, or receiver
2) a DMM (preferably a TrueRMS unit)
3) a method of generating low frequency sine waves (tone generators are easiest)
4) a approx 100watt, 20 ohm power resistor (there's latitude with this value, so just get close).

To test the tuning frequency of a ported sub:

Wire the resistor in series with the (+) lead going from the amp to the (+) woofer input terminal. Wire the (-) lead normally from the amp to the (-) speaker terminal.

At low volume send 50Hz sine wave into the speaker.

Set the DMM to "AC" and measure the voltage across the +/- terminals of the woofer.

Set the output from the amp so the multi-meter reads between 1&2 volts.

Now lower the frequency in steps 5Hz at a time. Each time write down the voltage reading from the meter.

As you go down in frequency there will be a point where the voltage bottoms, then starts back up again with the next lower frequency. The lowest meter reading is the port tuning frequency.

For example:

50Hz-1.2V
45Hz 1.3V
40HZ 1.2V
35Hz-1.1V
30Hz-1.0V
25Hz-.75V
20Hz-.5V
15Hz-.75V
10Hz-1.1V

In this example the port tuning is 20Hz. That's where the meter reading shows the lowest voltage.

Obviously you can use steps smaller than 5Hz for greater accuracy.
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Old 09-14-2015, 03:40 PM
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^thats how i tune crossovers^
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Old 09-14-2015, 05:02 PM
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I'm not sure how voltage would change, unless the back EMF from the coil moving is affecting voltage which makes sense, but you will see impedance spike above and below system tuning. Or you could try a cooler method.

https://youtu.be/QhIoX97B5XI

Last edited by Quentin Jarrell; 09-14-2015 at 05:08 PM.
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Old 09-14-2015, 05:29 PM
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if i were to do this for setting a HPF on an amp how much voltage drop should i be looking for here? i guess i could get all technical with it depending on slope and whatnot but is there a general idea?
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