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- Tuning Car Software
- Auto-eq Tuning Car Dsp Kit
- Auto-eq Tuning Car Dsp Parts
- Tuning Car Game
- Car Audio Dsp Eq
Welcome to the world of system tuning and DSP!
Jul 08, 2009 Full Credit to Terry SooHoo from Paradyme Car Audio in Sacramento. He wrote this and i found it EXTREMELY useful and so should you if you care anything about the SQ in your ride: Enjoy! Sq - How To Tune Your System (a Must Read) Welcome to the SMD forum! Sign in to follow this. Auto-EQ tuning with REW Welcome to the world of system tuning and DSP! There isn't much to argue on the fact that speaker building is an art requiring time and understanding of acoustic theories. While some simulation software may help for the design of your enclosure, audio measurements are the basis for any evaluation of your system.
There isn't much to argue on the fact that speaker building is an art requiring time and understanding of acoustic theories. While some simulation software may help for the design of your enclosure, audio measurements are the basis for any evaluation of your system. No matter how pretty your box is or the choice of high specs drivers, your 'system' (i.e. enclosure + speakers + crossover) may very well have poor specifications if it isn't properly tuned (equalization/time alignment).
Thanks to the partnership between the miniDSP platforms and the well known freeware Room Eq Wizard (REW), miniDSP is much more than a digital audio processor. By providing a complete measurement + system tuning solution fitting in the palm of your hand, the miniDSP product line innovates once again, yet keeping our price very competitive.
What's needed?
You will need:
- A miniDSP plugin that supports the 'REW integration' feature. (Suitable examples includes the Advanced 2-way, Advanced 2.1, Advanced 4-way, and the 2x8, 4x8, 4x10 and 10x10 Crossovers.)
- The miniDSP hardware that runs the plugin - see the 'Supported platforms' row on the plugin page linked above.
- Room EQ Wizard (REW), which is a free download from Home Theater Shack.
- A measurement microphone, such as the UMIK-1.
1. Make the initial measurement
In the miniDSP interface, disable all equalization and crossover filters on your subwoofer. Turn off all amps except the subwoofer amp(s), or disable the other outputs in the miniDSP interface. This is so you can measure the 'raw' subwoofer response.
Then, in REW, run a measurement sweep from 10 Hz to 300 Hz. Ensure that your SPL is adequate to get a clean measurement.
2. Calculate the correction filters in REW
From the REW main screen, open the 'EQ' tab.
Set the parameters as shown in the following screenshot. Note that in the Equaliser section you will need to select 'MiniDSP' for plugins running at 48 kHz, and 'MiniDSP-96k' for plugins running at 96 kHz.
Next, click on 'Set Target Level' to set the target level to REW's recommendation. (You can manually change it later.)
Then click on 'Match Response to Target.' REW will generate filters to optimize the response and display the predicted response (response after correction). Here is an example with the measured response in dark blue and the predicted response in light blue:
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You can see the filter settings calculated by REW by clicking on the 'EQ Filters' button near the top of the screen:
In this example, only three filters were needed. If REW uses a lot of filters or uses filters with very high Q (> 20), experiment with the target level setting to try and get a smoother correction curve. You can also experiment with the flatness target and the max boost settings to get the best predicted response.
3. Load the correction filters into the miniDSP
Once the predicted response is satisfactory, click on 'Send Filter Settings to Equaliser' and save the settings as a file.
Then, in the miniDSP plugin, navigate to the Parametric EQ block that will be equalizing the subwoofer. Set it to 'Advanced' mode and click on 'Import REW File.' Select the file that you just saved, and the plugin will then display the correction filter:
Confirm your result by running your measurement sweep again - it should be much smoother than before! Here in light blue is the new measurement, compared to the original measurement in dark blue - as you can see, the measured result is almost identical to REW's prediction:
4. Integrate the subwoofer
In the crossover block in the miniDSP interface, re-enable the subwoofer's low pass filter. If you have a ported sub, you may wish to also add a high pass filter to protect the sub from over-excursion at high levels and low frequencies.
Then enable the other outputs (main speakers or drivers) and run full-range measurement sweeps. If there is a bump or dip at the crossover point, try adjusting the crossover settings (frequency, slope, phase) and the time delay of the subwoofer to flatten it out.
Next steps
Once you have mastered the above procedure, you can improve your system even further:
- Try different subwoofer locations to find the one with the smoothest response. The smoother the response without equalization, the better the result will be with equalization!
- Make several measurements around the listening area, and in the REW All SPL tab, click on 'Average the Responses.' Then use that average for the EQ calculation.
- If you have a sealed sub, apply a Linkwitz Transform.
You will now have the smoothest bass response you could imagine! Don't forget to ask on the miniDSP forum if you have questions.
In this application note, we show you how to use Room EQ Wizard (REW) and its integration with miniDSP to equalize your subwoofer.
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What you will need[Top]
- A miniDSP plugin that supports the 'REW integration' feature. (Almost all current plugins support this feature. Check the User Manual for the relevant plugin or product for the capability to do Advanced biquad programming.)
- Room EQ Wizard (REW), which is a free download for Windows, Mac OS X, and Linux.
- A calibrated measurement microphone, for which we recommend the UMIK-1.
1. Make the initial measurement[Top]
- In the plugin interface, disable all equalization.
- Usually, you will also want to disable all crossover filters. This is so that the equalization can be applied independently of the crossover.
- Mute all output channels except the one that you want to measure.
Then, in REW, run a measurement sweep in the frequency range of interest. Ensure that your SPL is adequate to get a clean measurement.
2. Calculate the correction filters in REW[Top]
From the REW main screen, open the 'EQ' tab.
Set the parameters as shown in the following screenshots. Firstly, set the Equalizer to 'MiniDSP' for plugins running at 48 kHz, and 'MiniDSP-96k' for plugins running at 96 kHz.
In Target Settings, set Speaker Type to 'None', LF Rise Slope to 0.0, and HF Fall Slope to 0.0. (You can experiment with different settings later.) Click on 'Set Target Level' to set the target level. This is just an initial value - you will want to adjust it manually later, after performing your initial filter generation.
Now set the parameters for generating the correction filters. Shown below are a typical set of values for equalization in the subwoofer range. You will want to experiment with different values to get the best set of filters.
Then click on 'Match Response to Target.' REW will generate filters to optimize the response. Here is an example with the measured response in dark green, the corrected response in light green, and the correction filters in light blue:
In the above example, smoothing was set to 1/6th octave. REW will generate different filters depending on the amount of smoothing, so you should experiment with the amount of smoothing as well. The example below shows the result with 1/48th octave smoothing. It is a much 'tighter' EQ but also requires more filters and may not work as well over a larger listening area.
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You can see the filter settings calculated by REW by clicking on the 'EQ Filters' button near the top of the screen:
3. Load the correction filters[Top]
Once you have a correction that looks satisfactory, click on 'Save filter coefficients to file' and save the filter settings as a text file (.txt).
Then return to the miniDSP plugin and open the PEQ block that you want to put the filters in. Set it to 'Advanced' mode and click on 'Import REW File' (sometimes it is just 'Import'). Note that some plugin may not support the max number of PEQ that is being used by REW. Check the datasheet of the plugin for more info. Select the file that you just saved, and the plugin will then display the correction filter. Click 'PROCESS' to display your imported biquad.
Confirm your result by running your measurement sweep again - it should be much smoother than before! You can then repeat the above procedure in different configurations (*) but with different settings for REW's Smoothing and Filter Tasks. That way you can compare the audible effect of the settings.
Auto-eq Tuning Car Dsp Kit
(*) Many miniDSP plugins support four different configurations. Different configurations can be selected from within the plugin or with a remote control.
Auto-eq Tuning Car Dsp Parts
4. Add a room curve[Top]
Depending on what exactly you are equalizing, you may want to add a 'room curve'. This boosts the bass and also shelves down the treble slightly. The best way to do this is with low-shelf and high-shelf filters on the input channels of the miniDSP. (In the nanoAVR HD, it will have to be done in the output channels.) Here is an example of a house curve:
Wrapping up[Top]
Tuning Car Game
Now you can re-enable your crossover filters, and do some additional measurements to fine-tune your integration. If the results are not satisfactory, experiment with different settings: the target level, the amount of smoothing, and the frequency range of correction. That's it for this app note! Have fun, and please share your results in our forum.