Those are chips that act as a variable resistor and the resistance can be controlled in digital steps.
It may also have a digital potentiometer. It may have a micro controller that is pre-processing the sample values before passing them to the DAC and the volume is the factor by how much those values are reduced. How the device manages to get a small output volume is up to the device itself. So if you reduce the playback volume, the system will not send "smaller sample values" to the USB device, it will send the same sample values it would send at full volume.
Internally, it has a more advanced processor and architecture, as well as a more advanced graphics processor and better speakers, but reduced battery life.USB audio devices (which can be as simple as an USB stick with a headphone jack) have a dedicated volume property. “Touch Bar” in addition to a larger trackpad, but swaps a variety of ports for just four Thunderbolt 3 ports and a 3.5 mm headphone jack. Compared to its predecessor, this model has a completely different external housing that is thinner, is available in another color option, and has the aforementioned. Connectivity includes 802.11ac Wi-Fi, Bluetooth 4.2, four “Thunderbolt 3” ports (USB-C connector), and a 3.5 mm headphone jack. This preowned apple macbook MR942LL/A in UAE is offered in either silver colored aluminum or a darker “Space Gray” colored aluminum housing (but not other colors) and weighs just a bit more than 4 pounds (1.83 kg).
Additionally, it has a high-resolution LED-backlit 15.4″ widescreen 2880×1800 (220 ppi, 500 nits) “Retina” display, and an integrated battery that provides an Apple estimated 10 hours of runtime. This notebook also has an integrated 720p FaceTime HD webcam, a thin, backlit “second generation” butterfly mechanism keyboard with an integrated new “Touch Bar” that replaces the traditional function keys with a touch-sensitive control that adapts for different applications and provides Touch ID login support, and a gigantic “Force Touch” trackpad.
Intel HD Graphics 530 graphics processor that shares memory with the system. The MacBook Pro “Core i7” 2.7 15-Inch (Late 2016 Retina Display, Touch Bar, Four Thunderbolt 3 Ports) features a 14 nm, 6th Generation “Skylake” 2.7 GHz Intel “Core i7” processor (6820HQ), with four independent processors “cores” on a single silicon chip, an 8 MB shared level 3 cache, 16 GB of onboard 2133 MHz LPDDR3 SDRAM (which cannot be upgraded), 512 GB of PCIe-based flash storage, and dual graphics processors - an AMD Radeon Pro 455 with 2 GB of dedicated GDDR5 memory and an integrated preowned apple macbook MR942LL/A in UAE.
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