The term is Âtypically used in reference to speakers. A designer will have a vision as to how their speakers should sound. The designerÂs speakers can sound best with either tube or solid state amplifiers; therefore, they are Âvoiced with said amplifier in mind. Some speaker designers will take it further and Âvoice their speaker to sound their best with a specific manufactureÂs equipment. Example: Spectral  Avalon -MIT.
equipment tuned to sound with a certain set of colourations that the designer had in mind while designing the component(s). All audio gear has colourations - each designer chooses his/her set.
Yes, it's what Brf said and what Atmasphere punctuated so wittingly. When a designer stays true to how he voices his speakers you get what they call that 'house sound'.
Voicing is not something that should be done by designers and manufacturers . Voicing is something that the end user does to fine tune a well designed and set up system .
When I purchased my McIntosh MA6200 200 watt per channel solid state receiver I was casually informed that it had been designed to "sound like" their tube amplifiers. Perhaps that put the proverbial bug in my ear but I thought it definitely didn't sound like any other solid state amplifier I've owned, fer sure. Yes, it was a receiver being compared against my separates, perhaps unfairly, but I swapped it out for an MC275 MarkVI which did not sound anything like their solid states.
Methinks that more or less may qualify as a "voiced" component other than loudspeakers?
the term refers to a speaker and its designer. "Voiced" can mean a tubed or solid state piece of gear that really brings out its best effort. Or "cabling" (my fave) that will do the same in effect.
Usually in speaker design it means that the designer stopped measuring and made tweaks based on subjective listening impression. Changing the "voice" of a speaker if you will.
This can be very small such as trying out a bypass capacitor, or bigger, like changing the tweeter to woofer balance until the designer likes what he / she hears.
The term makes most sense with loudspeakers, but can be applied to electronics.
Personally, once I found my favorite reference curve, that is my crossover design, with the exception of minute changes made by bypass caps.
As others have said "voicing" applies to the sound the equipment designer is going for. What we as system owners do is choose to purchase components whose voicing in concert with our other components gives our system the sound that is most musically satisfying to us based on our personal preferences.
"Tweaking" is what we do to our gear to edge our system sound ever closer to what is most musical to us. This is where tube types/brands, footers, chassis damping etc. comes into play. For many of us this is where the real fun comes in as we get to feel like these system tweaks give us the power to determine our system's ultimate sonic outcome.
Once I watched a tree in the forest fall yet it didn't make a sound chagrined as I was by this anomaly i went quickly to the ground as it is with all that begins the tree, alas, was not plugged in.
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