Recent content by akl

... I should mention the methods to measure those distortions. REW allows such sophisticated DifferenceTone distortion measurements and ... measuring such distortions employing an external stimulus is an extra level of complications. You have to enable 3 (!) instances of REW ('multiple'...

I did a lot of measurements (also distortion tests with REW). Even a lot of balanced connections may not be really good. The quality depends on the common mode impedances of the OUT- und INputs. (The common mode impedance at single ended is ZERO ! ) The common mode impedances should be high...

You do not get a cal-file. It is NOT that the cal file is accurate, but you may judge a little the quality of the MIC , including the outliers. Behringer ... you get no quality control at all. The MIC-capsules may be almost the same ones. The second problem are the errors of the MIC-amp...

I would use periodic pink noise and (synchronised) analysis by REW . 500 - 2k (?) or 150-5k . Make several measurements and vary many parameters, If you get a steady calibration all is o.k. . (You should note the # dBFS at a certain SPL level and calculate your max. SPL level). Since even...

I use 3 minidsp UMIK 1 and the calibration file had been wrong by more than 3 dB ! IF you measure the sensitivity of a loudspeaker taht is double the power and a lot of power if you have to buy that extra power.

Just a comment concerning win XP and REW . win XP seems NOT to work with JAVA 8 (just 7-79) my win XP machines switch from beta 47 back to beta 13 or beta 8.

With the Behringer MIC ( and a MIC PreAmp and an AD ) you are just able to compare measurements, but you will not know which one is the right one ... the better one. CAL files (only individual ones of course with ser No.) are helping a little, but this still has a lot of tolerances. CAL files...

Why ? I use JAVA at 24 bit !

! This is correct . (The max SPL must be at the stated self noise, not inserting an attenuator increasing self noise). 4 db (A) (I doubt this is true) to 94 dB SPL ( == 1 Pascal ) is the SNR ( 90 dB ). The EIN seems also too good (-125.8 dBV). The dynamic range is NOT at exactly the SNR...

You mix very special Data. A selfnoise of 4 dB (A) will be to low, the EIN will be to good, the dynamic range 115 dB will be wrong and a gain in dB FS is impossible. I have never seen such an input using umik-1 and java. You state the dynamic range of a 16 bit system with rounding...

I think REW is a very fast and time saving software, very user friendly. I do not think that there are useful cal-files available for the behringer mic, they are not individual. Also there is no data included for the MIC-amp and AD. There is no RFZ . MIC have to have a different response...

NO, that is the problem, all fields are empty, all is cleared, but the old file is still engaged !

You can't have a MIC with very low noise and a perfect frequency response. For perfect noise measurements use the ITU 468 (CCIR) QP (QuasiPeak) instead of the 'A' filter with RMS. For low noise use a RF-condenser MIC instead of a classic condenser MIC (and pay a fortune ...). Try to get (older)...

A digital MIC with calibration data has the enormous advantage of NOT needing an additional calibrator. (Of course the provided CAL-data has to be correct). A digital MIC like all USB-MICs may be used as a calibrated Sound Level Meter right out of the BOX (after applying the cal-data and an...

I definitely do NOT like unbalanced connections. To much dirt. and ... RCA -- Cinch is one of the worst connectors arround.