Your receiver may also automatically enable a high pass filter Make sure that you don't have any active crossovers or equalizers enabled if you are using a receiver.įor example, any modes like Hall, Stadium, Movie, or Game will affect the speaker output. Use any type of clip/clamp that will hold it in place.įinally, hook the stereo up to the speakers that you are testing. You don't need to buy a real microphone stand. This might be OK for the subwoofer frequencies, but it will have a dramatic impact on the higher frequencies. You will not be able to hold it steady enough. Do not try to hold the microphone in place with your hand. In any case, you should fashion some type of microphone holder for your tests. This test can be done with speakers you have constructed or ones you buy off the shelf.
This type of test is used to find the ideal speaker location, height, and angle for your room. Want to account for the in-room reflections in the test. Do not use a shotgun microphone for this type of test since you actually Place the speakers where you want to have them permanently located in your roomĪnd place the microphone in your most likely listening position. Your other option is to setup an in-room listening test. This is necessary so that the microphone can pick up the signal from all of the drivers.
#Linux truerta drivers#
If you are testing a speaker box with multiple drivers then you will need to place the microphone a couple of feet from the speaker - or a couple of yards away if using a shotgun microphone. You then need a 1/4" to 1/8" adapter which can be easily found online or at an electronics store.
#Linux truerta professional#
Typically, a professional microphone will have the jack shown on the right, and the microphone cable will convert from that 3 pin connector to a 1/4" plug. You will need an adapter if your microphone has a 1/4" or a standard professional microphone connector. On a computer this is typically a 1/8" (3.5mm) mono plug. Plug your microphone into the microphone input jack on your computer. Use a laptop for speaker testing if you have one.
#Linux truerta software#
If you still want to purchase a calibrated microphone, check out the combined calibrated microphone + software deal from True Audio. So what does this mean? With an uncalibrated microphone you can still design a series or parallel notch filter, but you should not add a contour network based on results from an uncalibrated microphone. It will not help in identifying speakers that gradually increase or decrease in SPL over a wide frequency range since that could be a result of the microphone itself. It will not cause lots of random narrow spikes in your tests, so it can be used to try to find any spikes in a response curve.
Most of this error is above 4kHz and is a soft error. Note that your own custom microphone will not be calibrated, so expect a ☓-4dB error vs. If you don't have a microphone for testing, you may want to build your own instead of spending a lot of money for one.Ĭheck out our page on building your own microphone for information on building a quality microphone for under 5 dollars. You will also need software that generates test tones at different frequencies and then reads back those tones using the microphone connected to the computer. You will need a microphone and a computer with a microphone input & headphone/line-out output. Now that you have built your speakers, it is time to test them.
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