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Posts by robrob

Very cool test rig!
The headphone power calculator spreadsheet is here: http://www.head-fi.org/a/headphone-power-calculator-spreadsheet   There's also an Android version that's free, just search for rob robinette at the Play Store.
Both tables are for 32 ohm headphones but going up to 600 ohms makes little difference in speaker load due to the 2 resistor L-pad attenuator. You need to vary both R2 and R3 to keep the speaker load near 8 ohms. You can download my 'Headphone Power Calculator' spreadsheet to play around with.
No, they're pretty much for DIY'ers.
Do the easy thing and pick a pair of resistors to give you the attenuation you want:  
The mood you are in while listening has much more impact on 'sound quality' than using 'deluxe' cables. Most people want to hear an improvement after they've spent big money on new gear. Unless truly blind A/B testing has been done I'm highly skeptical of cabling improvements.
The 16 ohm resistors would work just fine as load resistors (no series resistor). Your amp would see around 14 to 15 ohms of speaker load and that wouldn't be a problem at all.
R2 of 14 ohms 5 watts 1%   R3 of 2 ohms 5 watts 1%   With headphones from 30 to 600 ohms of impedance will show your amp a speaker load of 16 ohms with 18dB of attenuation at the headphones.     If you don't need attenuation then an 18 ohm 10 watt 1% resistor across the + and - terminals will give your amp approximately 16 ohms of speaker load.
The only way you're going to hear a difference between digital cables is if one is so bad it's causing data loss. If all the ones and zeros are being read at the receiver correctly the cable makes absolutely no difference. Typically digital transmission either works 100% or it fails massively--like your HD TV--it's either crystal clear or huge digital artifacts show up on the screen. Have you ever seen an HD TV with just a few pixelations moving around the screen? I...
Nathan,   Recommendation: Try the amp connected directly to your balanced headphones first. Most amps, even tube amps will work fine with headphones. Do you have enough control with the volume control for comfortable listening? If the knob is too sensitive to movement then adding attenuation should help. Do you hear hiss? If yes then attenuation may help lower the noise floor and reduce the audible hiss. If you don't need attenuation you can run a 10 ohm 5 watt 1%...
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