My M70 under analisis

[chevyman-uy]

Today I went to the house of my friend Carlos, (audio technician).
I carry my m 70 and we analyze it, here some pics of the process and the data obtained, all tets are done whit bass and trieble at 0 and without loudness levels

start

graphics
RTA (Real tima analized)

FFT (crosswave)

estimed crosswave range

if someone can get some more specific data are welcome .

 

[Reli]

I cannot listen to any box without the loudness switch turned on.

 

[k2j]

I cannot listen to any box without the loudness switch turned on.

So true

 

[mellymelsr]

Loudness is a must...

 

[Lasonic TRC-920]

What does all this mean?

 

[Ken]

Your FFT is impressive. Fast Fourier Transform, right?

Your taking a 1.5khz tone and putting it through the M-70. Then your analyzing the results across an average frequency spectrum (20 - 20,000 hz.)

Digital signal processing. Spectrum analysis, for short.

What's with the crosswave?

 

[jaetee]

Your FFT is impressive. Fast Fourier Transform, right?

Your taking a 1.5khz tone and putting it through the M-70. Then your analyzing the results across an average frequency spectrum (20 - 20,000 hz.)

Digital signal processing. Spectrum analysis, for short.

What's with the crosswave?

I'm guessing that is a graphic representation of the woofer & tweeter's interaction with each other... on a three way speaker system you'd have a midrange in there to cover that little notch...

I think a normal test benchmark for measuring loudspeakers is how many db they can put out at 1 watt measured from 1 meter of distance... right? If that is what you were doing, then it looks like the M70 is good for a value in the high 50db range??? Someone please correct me if I'm off base...

 

[Ken]

An FFT is the algorithm used for digital signal processing.

 

[chevyman-uy]

As attempts to analyze the frequency response of M-70.
It sends the same reference signal (pink noise, http://en.wikipedia.org/wiki/Pink_noise) to the pc, and the m 70.
the microphone to one meter, centered between the speakers, The microphone picks up, the interaction of the channels;
this signal reaches the analysis program, the program displays the difference between the generated signal (pink noise) and what the microphone is picking up.

cross wave estimated range.