SMD DD-1 Owner's Manual
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SMD DD-1 Owner's Manual

Distortion detector
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Distortion Detector
DD-1
Owner 's Manual

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Summary of Contents for SMD DD-1

  • Page 1 Distortion Detector DD-1 Owner ’s Manual...

  • Page 2: Table Of Contents

    Measuring a headunit through an amplifier Setting the gain of a full range amplifier Setting the gain of a subwoofer amplifier Troubleshooting Where do I set my crossover frequency Where do I set my infrasonic (subsonic) filter Track list on the DD-1 CD Limited warranty...

  • Page 3: The Purpose And Benefit Of This Tool

    The purpose and benefit of the D’Amore Engineering / SMD Distortion Detector. The purpose of this tool is to enable the installer to set the gain of an audio amplifier to match the source unit’s output level, accurately and quickly. It can also be useful for detecting distortion in the audio signal caused by poorly designed or malfunctioning audio equipment.

  • Page 4: About The Design

    About the design When you pick up the DD-1, know that you are holding a precision piece of equipment. If treated as such it should provide you with many years of reliable service. We have chosen a 9V battery as a power source for a few reasons: ...

  • Page 5: Power Requirements

     Low Battery LED trigger battery voltage < 5.6Vdc  Auto-shut off timer 8 - 10 minutes after ON button is pressed Power requirements Pull the silicon rubber boot off of the unit by starting at one end and pulling off towards the other end. On the back side you will see the battery compartment.

  • Page 6: Measuring A Headunit Only

    2. Next you need to connect the DD-1 to the headunit’s outputs. Just plug the RCA outputs into the RCA input of the DD-1. If you are using speaker level outputs from the headunit, use the included harness. Red to speaker (+) and Black to speaker (-).

  • Page 7: Measuring A Headunit Through An Amplifier

    This time we are going to use the amplifier to boost the signal of the headunit. The DD-1 can measure the headunit’s distortion THROUGH the amplifier! 2.
  • Page 8 7. Slowly continue turning up the headunit until the Distortion LED illuminates, then turn headunit down slowly until it goes out. Note the volume setting. 8. If you have a full range amplifier, change to track 2. Repeat the steps 3-5 above, this time noting the 1kHz Detect LED.

  • Page 9: Setting The Gain Of A Full Range Amplifier

    0dB more gain overlap on regulated power supply amplifiers). 5. Using included harness, connect DD-1 to output of amplifier. Connect the red harness lead to the Left Speaker (+) terminal, connect the black to Left Speaker (-).

  • Page 10: Setting The Gain Of A Subwoofer Amplifier

    11. You are finished with the gain setting of this amplifier. Now disconnect the DD-1, connect the speakers to the amplifier, and set the crossover to the desired position. See Where do I set my crossovers section if you need help with this.
  • Page 11 0dB more gain overlap on regulated power supply amplifiers). 8. Using included harness, connect DD-1 to output of amplifier. Connect the red harness lead to the Speaker (+) terminal, connect the black to Speaker (-) terminal.
  • Page 12 14. You are finished with the gain setting of this amplifier. Now disconnect the DD-1, connect the speakers to the amplifier, and set the crossover to the desired position. See Where do I set my crossovers section if you need help with this.

  • Page 13: Troubleshooting

    Solution: This is not a problem at all, this is an artifact of the DD-1 being 100% analog. Analog is faster than digital, and as such the DD-1 detects distortion in the signal when the auto ranging circuit is switching ranges.
  • Page 14 LED just turns off. Problem: The DD-1 keeps turning off Solution: The DD-1 has an auto turn off timer, it will operate for 8-10 minutes after the “ON” button is pressed. This is to prevent it from eating your battery when you forget to turn it off.

  • Page 15: Where Do I Set My Crossover Frequency

    Where do I set my crossover frequency? This could be debated for days, and it really comes down to user preference. Here are some guidelines for the novice as a good place to start. If you hear the full range speakers “popping” or “bottoming out” when you play it at high volumes after using value in the chart below, turn up the crossover frequency until it stops.

  • Page 16: Where Do I Set My Infrasonic (Subsonic) Filter

    Where do I set my infrasonic (subsonic) filter? Again this is up for debate, here are some starting points for the less experienced. Speaker Sealed or Sealed or Ported or Ported or Size order order order order bandpass bandpass bandpass bandpass with with...

  • Page 17: Track List On The Dd-1 Cd

    Track list on DD-1 CD: Track Title Duration 40Hz -0dB 5 Min 1kHz -0dB 5 Min 40Hz -5dB 5 Min 1kHz -5dB 5 Min 40Hz -10dB 5 Min 1kHz -10dB 5 Min 40Hz -15dB 5 Min 1kHz -15dB 5 Min...

  • Page 18: Limited Warranty

    Limited Warranty D’Amore Engineering warrants this product to be free of defects in materials and workmanship for a period of one year. This warranty is not transferrable and applies only to the original purchaser from an authorized D’Amore Engineering dealer. Should service be necessary under this warranty for any reason due to manufacturing defect or malfunction, D’Amore Engineering will (at its discretion), repair or replace the defective product with...
  • Page 19 To obtain service worldwide please e-mail D’Amore Engineering at Warranty@DAmoreEngineering.com Notes:...
  • Page 20 D’Amore Engineering Owner’s Manual Rev. 7 2014 Printed in Tempe, Arizona...

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