bothu
Member
I have bought a UMK-1 and installed REW and started to measure on my homemade speakers.
My first question is about noise floor.
The RTA plot is taken in our summer house far from big roads and other houses.
There was no wind outside and no other noises. I switched off the incoming mains.
I put the mic. in the sleeping room and closed the door and had the computer outside the door.
The USB cable was about 3,6 meters ( 12 feet). So the condition for a god result was there.
But .... the result .... hf-peaks an still a high noise floor.
I had expected a much lower noise floor.
With a better mic. and no cable issues what figures can I expect ?
My second question is about distortion measurements in REW.
When I look at the dist. plots of my speaker I can see some plots under the noise floor.
How can that bee ? For me it seems impossible to measure something that is hidden in noise.
A related question is : In the control box there is an option for "Plot harmonics at the the harmonic frequency"
Witch setting is to prefer ?
My speaker:
Noise floor :
Dist plot: Blue is noise floor.
Best wishes from Bo Thunér in Sweden. ( Still learning and having fun ! )
My first question is about noise floor.
The RTA plot is taken in our summer house far from big roads and other houses.
There was no wind outside and no other noises. I switched off the incoming mains.
I put the mic. in the sleeping room and closed the door and had the computer outside the door.
The USB cable was about 3,6 meters ( 12 feet). So the condition for a god result was there.
But .... the result .... hf-peaks an still a high noise floor.
I had expected a much lower noise floor.
With a better mic. and no cable issues what figures can I expect ?
My second question is about distortion measurements in REW.
When I look at the dist. plots of my speaker I can see some plots under the noise floor.
How can that bee ? For me it seems impossible to measure something that is hidden in noise.
A related question is : In the control box there is an option for "Plot harmonics at the the harmonic frequency"
Witch setting is to prefer ?
My speaker:
Noise floor :
Dist plot: Blue is noise floor.
Best wishes from Bo Thunér in Sweden. ( Still learning and having fun ! )