Perceived quality can be influenced by listening environment (ambient noise), listener attention, and listener training and in most cases by listener audio equipment (such as sound cards, speakers and headphones).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Other than speakers and headphones, what other piece of equipment affects the listener's perceived quality?
Ah, so.. sound cards

Indoors, neoclassicism made a discovery of the genuine classic interior, inspired by the rediscoveries at Pompeii and Herculaneum. These had begun in the late 1740s, but only achieved a wide audience in the 1760s, with the first luxurious volumes of tightly controlled distribution of Le Antichità di Ercolano (The Antiquities of Herculaneum). The antiquities of Herculaneum showed that even the most classicising interiors of the Baroque, or the most "Roman" rooms of William Kent were based on basilica and temple exterior architecture turned outside in, hence their often bombastic appearance to modern eyes: pedimented window frames turned into gilded mirrors, fireplaces topped with temple fronts.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What tightly controlled book brought appeal for classic interior to masses?
Ah, so.. Le Antichità di Ercolano (The Antiquities of Herculaneum).

In the 1990s, Dell switched from using primarily ATX motherboards and PSU to using boards and power supplies with mechanically identical but differently wired connectors. This meant customers wishing to upgrade their hardware would have to replace parts with scarce Dell-compatible parts instead of commonly available parts. While motherboard power connections reverted to the industry standard in 2003, Dell continues to remain secretive about their motherboard pin-outs for peripherals (such as MMC readers and power on/off switches and LEDs).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What part of their motherboards does Dell not reveal the specifications of?
Ah, so..
pin-outs