Quote:
Originally Posted by drBill  Of course, THX is just a spec. I can't remember all the details, but I do remember that for Ralph's amps to qualify for THX approval, he would have to redesign and build them to a quality (lower) that he was not satisfied with. He refused to do it. For whatever that's worth.... |
I am not sure what THX asked him to change, but I doubt that it had anything to do with "lowering the quality" per se.
Here are all the items that THX evaluates when reviewing an amplifier. A manufacturer is certainly allowed to exceed the quantitative performance criteria:
Reference Output Voltage
Voltage Gain
Output Current
Output Source Impedance
Overload Restoring Time
Stability with Capacitive Load
Harmonic Distortion and Noise
Modulation Distortion
Difference-Frequency Distortion
Noise Output Voltage
Phase Response
D.C. Offset at the Output
Hum
Crosstalk
Acoustic Noise Level
Mechanical Noise
Input Sensitivity
Input Impedance
Output Impedance
Load Impedance Range
Voltage Output Capability
Current Output Capability
Transient Output Capability
Transient Overload Recovery Time
Asymmetrical Clipping
Frequency Response
Phase Response
Total Harmonic Distortion
Intermodulation Distortions
SMPTE IM Distortion
IHF IM Distortion
DIM 30 Distortion
Noise
Hum
Radiated Interference
Conducted Interference
Crosstalk
Cheers!