I see I read your graph wrong, but I'm still confused. Not your fault, I have dimensia today.
What do these graphs represent? Which one is "corrected" for meter errors? My answer is the one you add 35 Db to, the upper graph, correct?
What do these graphs represent? Which one is "corrected" for meter errors? My answer is the one you add 35 Db to, the upper graph, correct?
Bottom is the 'corrected'
As I explained with the pic post, the bottom one has the calibration file applied. The top one is as taken from the Radioshack. WinMLS corrects minus for whatever plus and vice versa. So the bottom one represents the top but with the correction imposed on it. Not sure for the absolute readings in the bass maybe I am +/1 2dB but sure that without subtracting substantial bass, the rough reading is way too full.
As I explained with the pic post, the bottom one has the calibration file applied. The top one is as taken from the Radioshack. WinMLS corrects minus for whatever plus and vice versa. So the bottom one represents the top but with the correction imposed on it. Not sure for the absolute readings in the bass maybe I am +/1 2dB but sure that without subtracting substantial bass, the rough reading is way too full.
Have you considered doing the hardware soldering mod I have seen around? Have you ever used a 2nd method of calibrating to verify these corrections?
Your numbers if valid, make me question the consistency of the meter errors across the board. Your numbers are way off from the accepted norm, perhaps it is very "technique" sensitive as well.
Your numbers if valid, make me question the consistency of the meter errors across the board. Your numbers are way off from the accepted norm, perhaps it is very "technique" sensitive as well.
when followed the web....
Have tried other typical suggestions from the web.
In the folowing pic you will see what happened. Upper trace is a verified one from a lab. Plugged mine in the same room same speaker same set up. Bottom is what I got using such data. There is some good evidence that some Radioshacks are way bassheavy. They are definently happy in mid-high and dumb in the final octave. I hope there are many others outthere having experience to contribute with the Radioshack. Please do.
Have tried other typical suggestions from the web.
In the folowing pic you will see what happened. Upper trace is a verified one from a lab. Plugged mine in the same room same speaker same set up. Bottom is what I got using such data. There is some good evidence that some Radioshacks are way bassheavy. They are definently happy in mid-high and dumb in the final octave. I hope there are many others outthere having experience to contribute with the Radioshack. Please do.
Attachments
RCA out
Keep in mind this is what I get from RCA out to soundcard MIC in not a correction for the neter readings.
Keep in mind this is what I get from RCA out to soundcard MIC in not a correction for the neter readings.
eric wallin-his site clearly showed to ADD ~6db ~ 20hz and 3db ~ 35hz... it under reads .
Perhaps deviation ? caused from what? Can your test methods be valid ? i dont know.
Perhaps deviation ? caused from what? Can your test methods be valid ? i dont know.
phantom?
Maybe from the ~1VDC phantom of the pc cards mic inputs? I will run it through line and keep you posted. But as it stands (RCA out to MIC in) its sure it over reads.
Maybe from the ~1VDC phantom of the pc cards mic inputs? I will run it through line and keep you posted. But as it stands (RCA out to MIC in) its sure it over reads.
You should go from RCA out to Line in.
The mic input is only for unpowered electret microphones with stereo 1/8" jacks. It has a 5V bias signal on the center conductor..
The mic input is only for unpowered electret microphones with stereo 1/8" jacks. It has a 5V bias signal on the center conductor..
Another mod
I was wondering how difficult would be to mod the meter to add a swich that lets to read 30 db lower (from 20 db to 70db). I need a meter to read residual noise on locations.
I think that providing 30 db more gain on the IC side. may be with another-less noise-OPAMP.
What do you think?
cheers
Ric
I was wondering how difficult would be to mod the meter to add a swich that lets to read 30 db lower (from 20 db to 70db). I need a meter to read residual noise on locations.
I think that providing 30 db more gain on the IC side. may be with another-less noise-OPAMP.
What do you think?
cheers
Ric
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