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Posts by jcx

http://www.eevblog.com/forum/ is AU centric
there are no legal questions absent an active patent for circuits - I have gone to dozens of IP seminars for engineers/entrepreneurs as a electronic equipment designer over my 30+ year career, have a patent, have searched for prior art for companies I worked for   only an active patent can protect a circuit - publish and don't file a patent application within a year and you have "open sourced" the circuit - it is free for any to use without any restriction, it becomes...
sorry folks - there is no real legal protection of circuits, hardware builds except for patents - active patents in the country the device is sold in   many in the hobby community would like to believe otherwise, may be confused with software copyright protection, the blizzard of copyright license terms for software attempting to assert "open, noncommercial" terms   headphone amps typically don't contain copyright software   exact mechanical/photo copies of a PCB...
you might try "HRTF" instead, the Smyth Realizer and other "Virtualizers" are a known topic across head-fi
for minimum phase systems analog minimum phase EQ to frequency flatness also corrects the phase response - IIR digital filters closely approximate analog types, FIR filters can be designed with flat, constant group delay and won't compensate an analog minimum phase system's phase - usually the default - but they can also be designed to modify phase/group delay if wanted
"Hiss Buster" resistor dividers can better maintain low Z drive and flatter frequency response than just series R if you need higher attenuation like 20 dB or more with a 1/10 Zdriver divider R to gnd paralleling the driver the only "right " solution though for really sensitive iem is to have step down audio output transformers
basic listening test standards are harder to apply/verify with electrostat amp/headphones - the fast, clue free Blind switching between amps, verifying level matching require specialized parts - much rarer, more expensive, more ways to fail than with  lower V, lower Z dynamic headphones   calibrating level with microphone and head/ear simulator are possibly easier but more variable than measuring the headphone drive V of electrostats - see Tyll's InnerFidelity headphone...
then you can lurk next to their mailbox/porch?
40W would be Gilmore's "Green" version if that were the all up instead of just the per stator power budget - now if he means 40 W * 4 ...   Gilmore's, some other's ES headphone amps already exceed 40 W total by 2x: +/-500 V * 10 mA * 4 = 40 W in just the output stages, some burn some more power in regulated supplies, as much again for vacuum tube filament heaters, some push Class A bias up to 15 mA   10 W per Q is no problem for those transistor's package - some PCB...
no one has ever advertised, sold phono cartridges with -60 dB crosstalk spec, alignment tools that would make that happen many $k cart only spec "better than 30dB" channel separation, a very few 40 dB phonograph tracks are mixed to mono at low audio to make them practical to cut, play 
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