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Frequency Sweep Analysis Issue/Lowend Lower in dB

So I create a frequency sweep in Adobe Audition 3.0.
5-22kHz for testing gear..
Whenever I do an offline frequency analysis of the sweep, how come the lowend up to 160Hz
is rolled off very slightly...
Even when using a spectrum analysis plugin , set to averaging, to maintain the trace.

choosing wireless mic frequency range Canada

Forums

I'm ordering a Sennheiser Evolution Wireless vocal system and have three choices in frequency ranges. This will be my first of a few wireless systems I will get over the next few years.
How do I know which range to choose from for Canada?

A range (516-558 MHz), B range (626-668 MHz) and G range (566-608 MHz).

high frequency capture on a budget

Are there any small condenser mics under £100 with a flat response from 2000 to 20.000 . .

Are we talking RODE M3 ? or anything else out there

Under 2000 response not an issue in this case...I'm only interested in the best quality over 2000

?

prefer the mics to be black as well LOL :)
any advice much appreciated.

How do you find a singers frequency range?

So how do you find a singers frequency range and purchase/match a mic to their voice. For example I'm a lyric tenor, I have a lot of upper partials. Also, I have a lot of reverberation because of my classical training. What do I look for in a mic and is there a way to try before I buy?

frequency band

A range of frequencies, as defined by a regulatory authority or by commonly accepted usage. In audio, the term usually refers to equalizers, in particular graphic EQ's. In telecommunication, a frequency band is a specific range of frequencies in the radio spectrum. Used in wireless microphones.