Hi everyone .
So far I have used the equipment listed below to take measurements of my Karlson K12 prototype kabinet. I have always used a single speaker (12" woofer) without crossover and without tweeter, sweep frequency 20-2KHz:
Laptop PC combined with REW software, e-mu 0404 sound card, om1 line microphone and finally marantz pm510dc amplifier.
Lately I haven't been able to take measurements anymore and I would like some help to understand where the problem lies.
when I start a measurement, REW detects no signal, or very low signal, as you can see from the attached image. Despite this, I hear a very loud noise coming out of the speaker. I suspect the amplifier is the cause but I can't be sure.
I tried listening to music but what I hear is unpleasant. when everything worked well I always took the measurements with the amplifier's EQ active but with all the levers set to zero. now I can no longer use this function and it has been disabled with the (EQ defeat) button because otherwise a horrible noise will be heard. lately you can't even hear the noise anymore but a protection is triggered (I imagine this) and you can't hear anything.
there is another thing that I don't understand, REW doesn't work right even though the sweep volume is high. perhaps some protection is triggered within the software because what comes from the microphone is wrong. I suspect the problem lies in the amplifier's EQ circuit.
what do you suggest?. Hello and thanks
So far I have used the equipment listed below to take measurements of my Karlson K12 prototype kabinet. I have always used a single speaker (12" woofer) without crossover and without tweeter, sweep frequency 20-2KHz:
Laptop PC combined with REW software, e-mu 0404 sound card, om1 line microphone and finally marantz pm510dc amplifier.
Lately I haven't been able to take measurements anymore and I would like some help to understand where the problem lies.
when I start a measurement, REW detects no signal, or very low signal, as you can see from the attached image. Despite this, I hear a very loud noise coming out of the speaker. I suspect the amplifier is the cause but I can't be sure.
I tried listening to music but what I hear is unpleasant. when everything worked well I always took the measurements with the amplifier's EQ active but with all the levers set to zero. now I can no longer use this function and it has been disabled with the (EQ defeat) button because otherwise a horrible noise will be heard. lately you can't even hear the noise anymore but a protection is triggered (I imagine this) and you can't hear anything.
there is another thing that I don't understand, REW doesn't work right even though the sweep volume is high. perhaps some protection is triggered within the software because what comes from the microphone is wrong. I suspect the problem lies in the amplifier's EQ circuit.
what do you suggest?. Hello and thanks
Attachments
Not sure about your amplifier, but REW can’t see your microphone. Try changing the input on the drop down at bottom right, and you should see background noise on the rolling graph at bottom left. Tapping the microphone will prove that it’s the right input
Brian
Brian
HI .
in the end I formatted the PC and then installed all the necessary software again. I also changed the amplifier, in my hurry I was forced to buy a cheap hafler p3000. when it is turned on you can hear a slight hum, in my opinion it is due to the transformer or fan if it exists. Apparently the inputs are balanced XLRs. I don't know if I can connect them directly to the outputs of the e-mu 0404 sound card without making any changes. Before causing damage I thought I'd ask.
I attach files and images.
in the end I formatted the PC and then installed all the necessary software again. I also changed the amplifier, in my hurry I was forced to buy a cheap hafler p3000. when it is turned on you can hear a slight hum, in my opinion it is due to the transformer or fan if it exists. Apparently the inputs are balanced XLRs. I don't know if I can connect them directly to the outputs of the e-mu 0404 sound card without making any changes. Before causing damage I thought I'd ask.
I attach files and images.
