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Frequency Response Question. Sony player says Frequency Response : 20 - 20,000Hz (When playing...

post #1 of 9
Thread Starter 

My sony s series walkman mp3 player says the following about its frequency response.

Frequency Response : 20 - 20,000Hz (When playing 44.1 kHz sampling data file, single measruement)

What does this mean?

I'm asking this cause many of the portable amps I see have the same frequency response and so I'm asking myself if I stand to gain any sound quality from an amp for my denon 2000. Sony players are supposed to have one of the best sound qualities ever. Now I understand that I'm talking consumer grade electronics here. Any suggestions on what are good sources at consumer grade price. In the past I had a panasonic cd player and that was the best source I ever had.

post #2 of 9

20 - 20,000Hz is the standard slap on tag, cause thats the average hearing range of the human ear it means nothing without the -/+ db rating.

post #3 of 9
Thread Starter 

Oh thanks. That was another thing I was wondering. Whats the -/+ db in the frequency spec and how does it affect the sound? Could use some enlightenment sir.smile.gif

post #4 of 9

across the entire frequency spectrum, you have an average sound pressure level from a given device.  the +/- tells you the variance there is between the lowest and highest spl's along the entire range.  so if a device measures 20-20k +/-3db, then across that entire range, the sound pressure only varies up or down by 3db for any given frequency.  Sometimes, a company will want to boast a deeper bass response (for marketing purposes), so they will show "10-20k +3/-9db."  This means that across this range of frequencies, the sound pressure levels may be 3 above average, or up to 9 below average, at certain frequencies. 

 

a lot of companies simply omit the +/- altogether, making the 20-20k statement essentially meaningless
 

Quote:
Originally Posted by coolaneasy View Post

Oh thanks. That was another thing I was wondering. Whats the -/+ db in the frequency spec and how does it affect the sound? Could use some enlightenment sir.smile.gif



 

post #5 of 9

3db is the difference in volume the human ear can detect, so if you see 20hz - 20khz -/+3db it means from 20hz-20khz the frequence responce doesn't spike or dip above 2.9db, if it's just -3db it means the freq responce doesn't dip by 3db until 20hz or 20khz but could spike above +3db.

post #6 of 9
Quote:
Originally Posted by JRG1990 View Post

3db is the difference in volume the human ear can detect, [...].
I think it can be less than that, depending on frequency and testing conditions: http://www.audioholics.com/education/acoustics-principles/human-hearing-amplitude-sensitivity-part-1
post #7 of 9
Thread Starter 

So what is a good -/+ db?

Are these specs good?

 

  • Max output power:
    • 20 mW into 16 ohms
    • 40 mW into 32 ohms
    • 50 mW into 100 ohms
    • 15 mW into 300 ohms
  • THD, A-weighted:
    • <0.025%, 1 mW into 32 ohms
    • <0.025%, 1 mW into 100 ohms
  • Dynamic range, A-weighted:
    • 93 dB, USB input
    • 102 dB, analog input, 32 ohm load
    • 108 dB, analog input, 100 ohm load
  • +10 dBV max into high-impedance load (>600 ohms)
  • Frequency response: 13 Hz to 22.5 kHz, +/-1 dB
  • Op-amp supply rails: +/-5 VDC

 

I don't know what THD is but still pasting that info here.

post #8 of 9

Looks ok to me, longs you don't plan on using headphones too much above 100ohms with it, and the dynamic range via usb is a bit low, THD : http://en.wikipedia.org/wiki/Total_harmonic_distortion , anything below 1% is fine and inaudible.

post #9 of 9
Thread Starter 

okay. those r the specs on my portable amp that i purchased. hope it drives my denon 2ks better than the sony player


Edited by coolaneasy - 5/10/11 at 2:05pm
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