![]() So using the -10db 40hz track to tune the subwoofer channel and the result is spot on! In my case study I’ve used for the speakers a -5db at 1Khz track but for the sub when I’ve used the 40hz -5db track the system was too flat for my taste and did not perform well on the low and as I would like it to. Set the HU to its maximal unclipped/undistorted volume and play the test tone – as follows:ġ.ğor SQ oriented speakers/subwoofer use the -5db attenuated tracks.Ģ.ğor a compromised system between SQ to a loud/SPL system use the -10db tracks.ģ.ğor a rather loud system use the -15db tracks. ![]() Well now that we’ve found the HU THD threshold we can continue tuning the amplifier’s gain by connecting the DD1 directly to the speaker output. The process of the test is identical to measuring HU’s THD directly connected to the DD-1 only this time you are to connect the probes to the amplifier’s speaker output and set the amplifier gain to the minimum thus you measure the signal as it goes out of the HU and through the amplifier on its minimal gain so that the original signal leaving the HU is minimally affected by the amplifier. Testing HU’s THD through the amplifier – yes it is doable! Needless to say the HU’s audio settings – EQ, Boosts etc. Take the volume down a little until the distortion LED is turned off and you are set – now you know your maximal HU’s volume. Raise the volume of the HU until you see the correct frequency detected (either 40hz or 1Khz) and continue to raise it until detection LED is showing RED. If it is a subwoofer channel then use the 40hz 0db attenuation track. If it is a speaker channel then use the 1Khz 0db attenuation track. SMD Distortion Detector DD-1 - SMD Distortion Detectors - SMD Tools - SMD ProductsĬonnect the RCA output of the HU directly to the RCA Input of the DD-1 using the RCA cable going towards the amplifier. The device has a single input of type female RCA and that is to ease of use as you can connect the head unit RCA cable directly to the DD-1 (It can be any analogue source type).īut it is also provided with a Input converter from RCA female to two probes (plus and minus – red and black) so that you can directly connect it to speaker wire or to amplifier speaker outputs.īefore I proceed here is a link directly to the product page: The DD-1 is provided along with a test CD that includes nine tracks: The DD-1 alerts THD (distortion) detection once the THD is greater than 1% (no this is no a mistake, not 0.1 nor 0.01 but greater than 1%) The DD-1 is measuring THD, not Voltage RMS, not showing you sine wave clipping – neither does voltage nor clipping can tell you how much THD you have in your audio channel (in fact clipping comes after THD is audible for best of my knowledge). So what does it measure? What does it do? And why it is “revolutionary” in compare to the old school methods of testing with an Oscilloscope and Multi-meter? What is the DD-1 product purpose? DD stands for Distortion Detector (1 is the version) Steve Meade and D’amore industries are mainly SPL oriented for the best of my knowledge but some of the measurements products and tools they offer today are easily qualifying for tuning SQ oriented audio systems as well. Not sure if this product was already reviewed over here but I would like to post my impressions any way as it is a fabulous little “Gizmo”. My name is Eddie and I am located at Israel.
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