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Analyzing Headphone Freq. Response in RightMark?

post #1 of 5
12/13/05 at 4:42pm
Thread Starter 
Recently read and saw a few post pertaining to the bass "shortage" on the iPod with low impendance headphones, and also saw the frequency response graphs. One of the graphs measured the Grado SR60, Sennheiser HD25SP, and Sennheiser HD600. Showing the differences in frequecy response affected by the impendance (higher = better sound + less bass rolloff).

What I would like to know is how did they measure the different headphones that are connected to the iPod? Or did they just simulate the whole thing?

I just downloaded the RightMark Audio Analyzer and seems like neat tool, especially if I could do the same thing as the graphs refered to.
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post #2 of 5
12/13/05 at 9:29pm
Well, how do the graphs look like? More or less straight lines just differently rolled off - especially on the low end? Or rather jaggy as real headphone frequency response graphs look like? In the first case it's probably a simulation using different resistors as loads that equal the different nominal impedances of the headphones. Not very difficult to do. In the other case, it would ideally be a test setup actually using the different headphones in combination with measurement microphones mounted in artificial ears - not too difficult either, but quite a bit more expensive than the resistor simulation...

Greetings from Hannover!

Manfred / lini
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post #3 of 5
12/13/05 at 11:31pm
Thread Starter 
So I'm guessing it's just simulated, because the graph showing the bass rolloff is pretty straight and just curved off at 300Hz, 200Hz, and etc. Although is it possible to simulate the impendance load with a virtual method (software) rather than actual resistors in the path?
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post #4 of 5
12/14/05 at 6:08am
Quote:
Originally Posted by firefox360
Although is it possible to simulate the impendance load with a virtual method (software) rather than actual resistors in the path?
Not with RMAA, I'm afraid. I'm not an electrical enigneer, but I'd assume this would be possible, if one simulates the whole circuit with a software like Spice.

Greetings from Hannover!

Manfred / lini
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post #5 of 5
12/14/05 at 8:45am
It doesn't even have to be simulated. Just plug a dividing adaptor into the source, headphones to the other end and sound card input to the other.
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