This challenge may seem simple to some audio/electrical engineers, but I being an 8th grader I am having some issues because its beyond my level of math/science. The deal is, my dad being the science nerd that he is (well, physics major, same difference), says he'll buy me a headphone amplifier if I can somehow prove graphically or mathmatically that is can make a difference.
Problem is I'm not very good at math or science, and at the least bit I don't have enough experience with these two fields to be able to effectively present that. So this year I participated in my first ever science fair (little off topic I know), so I'm going to attempt to establish my experiment as scientifically methodical as possible! Personally, I think he just wants me to do this for the learning aspect of it.
How am I going to prove that my headphones will graphically/statistically benefit from an amplifier?
I. Headphones: Shure 750DJ, the following graphs come from HeadRoom.
The isolation graph seemed redundant so I left it out.
II. Amplifier: FiiO E7 (actually, it is a DAC/Amp combo)
Specs below are from http://content.miccastore.com/fiio-e7
- Output Power: 150mW (16Ω); 16mW (300Ω)
- Headphone Impedance Range: 16Ω ~ 300Ω
- Signal to Noise Ratio (A Weighted): ≥95dB Line In; ≥100dB USB
- Distortion (10mW): <0.009% Line In; <0.008% USB
- Frequency Range: 10Hz ~ 1000KHzPower Supply: Internal 1050mAH Rechargeable Li-Ion Battery
- TI PCM2706 USB receiver, 48kHz 16-bit support for Windows XP/2000/Vista/7 and Mac OS
- Wolfson WM8740 DAC, ADI AD8692 OP Amp and TI TPA6130A Power AMP
Unfortunately I'm not sure where to continue with this and I'm stuck. What can I use/measure to prove a graphical increase in the performance of my headphones??? Another problem is my headphones don't benefit hugely from an amplifier, and the E7 amplifier is a portable amplifier so it doesn't have a lot of power in comparison to a desktop one like the E9. So here I am. For anyone out there who knows what I'm talking about, wow, I could really use your help right about now. If you need more information or if you could tell me what kind of information I need, I will try as hard as I can to find it.
Edit: Oh no, it seems the headroom graphs aren't showing up... ugh... well if you can spare the time heres a link to them http://www.headphone.com/headphones/shure-srh750dj.php
Edited by iceshark - 6/1/11 at 5:58pm