Full range sweep - odd graph

1985 Views 7 Replies 4 Participants Last post by davidbrn, Feb 16, 2012

davidbrn

Discussion Starter · Feb 4, 2012

I've just been having a go at doing some full range sweeps, with a view to producing some convolver filters for use in J River. The graphs though look really odd - there's a 25db drop off from 7k to around 250. My speaker should roll off at around 55, so I can only assume I've done something wrong.

I'm measuring with a Behringer ECM8000 mic connected to a Behringer MIC100 valve pre-amp, and an M-Audio Audiophile 2496 soundcard. The sound card calibration looks 'normal' i.e similar to others on here, no mic calibration file.

Any suggestions?

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EarlK

· #2 · Feb 4, 2012 (Edited)

Hmmm,

> Maybe a , "Flipped" polarity switch on the MIC1000 compared to your original SC calibration ?

> Run another sweep without a soundcard calibration file .

:sn:

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