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## Please help me understand 88A Voltage output 7 years 7 months ago #21533

 AustinJerry Topic Author Offline Elite Member Posts: 166 Thank you received: 57 I have attached below a recent measurement of the output voltages in my setup. All connections are balanced, and the 88A settings are 8V input and 8V output. Kindly help me understand why the 88A output is only .4V when driven by a 2.2V input. Is this normal, or an indication of a problem? Please Log in or Create an account to join the conversation.

## Please help me understand 88A Voltage output 7 years 7 months ago #21535

 john.reekie Offline Platinum Member Posts: 3778 Thank you received: 1593 Hi Jerry, I don't understand why you would think it to be a problem. Are your measured acoustic output levels OK? Please Log in or Create an account to join the conversation.

## Please help me understand 88A Voltage output 7 years 7 months ago #21538

 AustinJerry Topic Author Offline Elite Member Posts: 166 Thank you received: 57 I don't perceive any issues with output levels, John. The question is more so that I can understand the behavior of the 88A more fully. My first question would be, is this a typical result? For someone who asks about 88A output voltages, can I simply tell them "Measure the input voltage, multiply it by 20%, and that will be your output voltage"? If this behavior is not typical, or if the output is not always 20% of the input, then I would like to know what factors influence the output voltage levels. Make sense? Please Log in or Create an account to join the conversation.

## Please help me understand 88A Voltage output 7 years 7 months ago #21545

 AustinJerry Topic Author Offline Elite Member Posts: 166 Thank you received: 57 Unfortunately, this is not an experiment I am willing to make. The gain setting on my amps have been carefully set so that the combined sub output level matches the output level of the main speakers as measured by the level-setting test tones in DLCT. Raising or lowering the sub gains would have an undesirable effect on the Dirac Live calibration. While I suppose I could do it as a proof-of-concept exercise, I am reluctant to disturb the settings that have resulted in the excellent results I am now enjoying. So I believe what you are saying is that the output voltage is determined by the Dirac calibration, and is set to achieve the appropriate output levels. That makes sense. And, of course, this voltage level would vary from one setup to another, depending on a number of factors such as the input sensitivity of the subs. If I am understanding you correctly, I think my original question has been answered. Please Log in or Create an account to join the conversation.

## Please help me understand 88A Voltage output 7 years 7 months ago #21599

 devteam Away Administrator Posts: 9162 Thank you received: 1461 Jerry, Your final paragraph is indeed right on the mark. Dirac Live will calibrate for "acoustic level" rather than electrical level. It will look at the entire system of anything downstream the DDRC-88A and will adjust accordingly its gain structure. So the reasoning for these levels is basically based on the unique setup of amplifier gain + speaker sensitivity (+ 2x4 gains on the path) that the Dirac Live algorithm measures. No magic formula I'm afraid. Does this make sense? DevTeam miniDSP, building a DSP community one board at a time. For any official support, please contact our technical support team directly @ support.minidsp.com/support/home Please Log in or Create an account to join the conversation.

## Please help me understand 88A Voltage output 7 years 7 months ago #21607

 AustinJerry Topic Author Offline Elite Member Posts: 166 Thank you received: 57 Yes, your answer makes total sense. Thank you for confirming. Jerry Please Log in or Create an account to join the conversation.
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