I don't agree with everything said in that video, plus, was that not a shameless plug for the mayflower? ha ha, also, isn't sound reproduction subjective to the end user?, hearing is fascinating, according to 'The Scientist and Engineer's Guide to Digital Signal Processing' The human ear is an exceedingly complex organ. To make matters even more difficult, the information from two ears is combined in a perplexing neural network, the human brain, there are many subtle effects and poorly understood phenomena related to human hearing. The middle ear is a set of small bones that transfer this vibration to the cochlea (inner ear) where it is converted to neural impulses. The cochlea is a liquid filled tube roughly 2 mm in diameter and 3 cm in length. When a sound wave tries to pass from air into liquid, only a small fraction of the sound is transmitted through the interface, while the remainder of the energy is reflected. This is because air has a low mechanical impedance (low acoustic pressure and high particle velocity resulting from low density and high compressibility), while liquid has a high mechanical impedance. In less technical terms, it requires more effort to wave your hand in water than it does to wave it in air. This difference in mechanical impedance results in most of the sound being reflected at an air/liquid interface. Information encoding schemes like the place principle and volley are interesting to read up on. Action potentials, it's all in your head, ha ha.
I'm not sure it the SBZ is Differential or Single-ended or entry level Stereo DAC? According to one Sound Blaster Z review, the sound card uses the Cirrus Logic CS4398 digital-to-analogue converter (DAC) it feeds the card's analogue stereo line and headphone outputs. A JRC 2114 op-amp is used for line output while a MAX97220A headphone amplifier powers the headphone output on the back panel, which is capable of handling studio-grade headphones with an impedance of 600 ohms. A second MAX97220A is used for the back panel centre/sub connector and the sound card's front panel connector for your case. Finally, a JRC4556a op-amp is used for surround sound rear-out in 7.1 configurations. the signal to noise ratio [SNR] 20kHz Low-pass filter, A-Weight. The 600 Ohm Amplified Headphone Output is the Maxim MAX97220A,
Maxim Intergrated
Dual-Use Headphone Amplifiers and Line Drivers with Flexible Gains and Low Noise Performance
The MAX97220 is a differential input DirectDrive® line driver/headphone amplifier. This device is capable of driving line level loads with 3VRMS into 1kΩ with a 5V supply and 2VRMS into 600Ω loads from a 3.3V supply. A headphone load is capable of being driven with 125mW into 32Ω with a 5V supply. The IC is offered with an internally fixed 6dB gain or an externally set gain through external resistors. The external gain setting nodes can also be used to configure filters for set-top box applications. The IC has exceptional THD+N over the full audio bandwidth.
The SBZ sounds good to me, I connect headphones [AKG K702, Sennheiser HD 555] straight into the sound card, i prefer to disable all soundblaster SBX software/effects, sample rate in windows 10 x64 is set to 16 bit, 48000 Hz or 16 bit 44100 Hz, nice clear detail and subdued bass, I don't like any distorted or overblown Low-frequency effects.