Hello Participant,
this is my first post in forum. We apologize for the english language. I live in Germany and now use google translator.
It's about this Class-D amplifier; Dayton MA1260_12xDigiamp .
It's a newly bought amp at soundimports.eu in holland (Nederland)
The amp works ok but everyone (all 12) Outputs have a DC offset of
-27mV to 137mV.
I want to ask you; Has anyone had experiences with this amp.
How does a dc-offset arise at a Class-D output. I don't have any experience. I have had good experiences with analog amps and dc offset! As you all know, a DC greater than 20mV at the output is already dangerous, especially
when used as an activ-crossover for tweeters.
And I just want the Dayton MA1260 for use an active crossover line array project .
Thank you for your help and clarification!
Csaba
this is my first post in forum. We apologize for the english language. I live in Germany and now use google translator.
It's about this Class-D amplifier; Dayton MA1260_12xDigiamp .
It's a newly bought amp at soundimports.eu in holland (Nederland)
The amp works ok but everyone (all 12) Outputs have a DC offset of
-27mV to 137mV.
I want to ask you; Has anyone had experiences with this amp.
How does a dc-offset arise at a Class-D output. I don't have any experience. I have had good experiences with analog amps and dc offset! As you all know, a DC greater than 20mV at the output is already dangerous, especially
when used as an activ-crossover for tweeters.
And I just want the Dayton MA1260 for use an active crossover line array project .
Thank you for your help and clarification!
Csaba
If all 12 outputs are registering large offsets, your measurement tool may be affected by the RF output. There is probably a lot of high frequency noise on the output. Also most Class D amplifiers prefer to have a load on the output at all times (4-8 ohms?).
Try momentarily connecting a speaker to one of the channel outputs, to see if you can hear a click (induced by a real DC offset output). If you don't hear a click, the offset may not be real.
Try momentarily connecting a speaker to one of the channel outputs, to see if you can hear a click (induced by a real DC offset output). If you don't hear a click, the offset may not be real.
Hello, thank you!
A 4.7 OHM resistor is connected to the output for the measurement. The DC offset is available for all channels. I will try it out with loudspeaker and "click". But a DC offset of 100mV and more is already very dangerous for tweeters. then do i have to use serial capacitor?
A 4.7 OHM resistor is connected to the output for the measurement. The DC offset is available for all channels. I will try it out with loudspeaker and "click". But a DC offset of 100mV and more is already very dangerous for tweeters. then do i have to use serial capacitor?
I wrote to Dayton Audio and asked, but they hold back and give me no information. It's all a secret!
What is your experience with class d amplifiers with regard to dc offset? Someone has probably already measured the outputs. Thank you !
Isn't there anyone who uses class-d amps and has measured the dc voltage at the output?
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It would be interesting to know if people were to measure this voltage!
When it comes to analog amps, people always pay attention, but what about class-d amps?
Thank you in advance!
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It would be interesting to know if people were to measure this voltage!
When it comes to analog amps, people always pay attention, but what about class-d amps?
Thank you in advance!
It's been a long time since I haven't written. I now have 4 pieces of the amp MA1260 and all outputs have high DC offsets up to 117mV! I connected 4 ohm speakers directly, as Mello4 said, and the crackling at each output. It is definitely not a measurement error! I measure with the UNI-T's UT195M DC multimeter. Who knows these problems with digital power amplifiers?
Is it a design flaw or is it from other sources?
Unfortunately, I don't know the topology and IC of the MA1260. Thanks for your help!
Greetings, Csaba!
Is it a design flaw or is it from other sources?
Unfortunately, I don't know the topology and IC of the MA1260. Thanks for your help!
Greetings, Csaba!
Are you manually selecting the DC mode (not the auto mode) on the DVM. If in Auto, it may give AC RMS of the amplifier switching noise.
Are you shorting the each input, to prevent stray signals from the input, when you measure the output DC offset?