How to Measure Speaker Distortion Correctly?

Status
Not open for further replies.
Jump to Latest
#41
bwaslo said:
For the microphone, plug it into a usb port, go to Control Panel and find the Sound settings for Recording devices.
For the software, right click on the Omnimic icon, choose Proprties, Compatibilities settings.
Im not on a Windows machine right now, but for more detailed instruction go to the DaytonAudio.com site and look under Omnimic...
Dayton Audio Dayton Audio OmniMic V2
Click to expand...

Seems it was already done by me before, TY
 
#42
Can someone offer a clarification on this subject

I use a Seas T25CF001 tweeter in a 4way active design, with an LR4 HP @2KHz

On this website, the tweeters measured distortion at around 100db spl is -50db above 2KHz
http://www.audiogurman.com/1.htm#t25cf001

But when i make a distortion measurement of this driver in the enclosure (no filters) I get THD (dominated by 2nd) at around -38 db for a sweep at 80db

what could explain this elevated distortion in my setup

the measurement was using focusrite 2i2 as ext soundcard and ncore400 as the amp
 
Last edited:
#43
jojip said:
Can someone offer a clarification on this subject

I use a Seas T25CF001 tweeter in a 4way active design, with an LR4 HP @2KHz

On this website, the tweeters measured distortion at around 100db spl is -50db above 2KHz
??-????????

But when i make a distortion measurement of this driver in the enclosure (no filters) I get THD (dominated by 2nd) at around -38 db for a sweep at 80db

what could explain this elevated distortion in my setup

the measurement was using focusrite 2i2 as ext soundcard and ncore400 as the amp
Click to expand...
80dB SPL at 1 meter? How close is the microphone?

A lot of microphones suffer from 2nd order distortion when subject to higher SPL (>90) due to the internal FET in the microphone capsule. The closer you place the microphone the higher SPL you are subjecting it to. If the level is 80dB SPL at 1m, it is 98dB SPL at 10cm. You can move your microphone further away from the speaker to prevent distortion from the mic, but then your noise floor will suffer.
 
Last edited:
#45
jojip said:
...the measurement was using focusrite 2i2 as ext soundcard and ncore400 as the amp
Click to expand...
Are you using a balanced connection between the focusrite 2i2 and ncore400?
If not, are you using a mono TS plug in the focusrite outputs to get an unbalanced signal?
The reason I ask is that it will short the other half of the balanced driver. This can increase distortion considerably depending on the output circuitry. Can't seem to locate it right now, but I have read that the 2i2 suffers from this issue.
 
Status
Not open for further replies.
Top Bottom