Yamaha PSR-I400 Portable... Size-61 Keys , Ranking-5 Star, Colors-Dark Grey
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The main difference between a piano (a standard acoustic piano) and a digital piano is the mechanism that produces the sound.The acoustic piano produces sounds by channeling the power of the fingers pressing the keys into the hammers, which strike the strings. The vibrations produced by striking the strings are transmitted to the soundboard, and diffused richly, which amplifies the sound.
Digital pianos are equipped with hammers, though. These are not for the purpose of striking the strings, as with an acoustic piano, but instead are employed to capture the dynamics with which the key is played, yielding a dynamic response to touch that more closely approximates the experience of playing an acoustic piano. Digital Pianos as the name says run by power supply.
What do people prefer and why ?
To explain in one line digital pianos produces good sound with low maintenance whereas acoustic piano produces more natural sound but need regular maintenance
The Focusrite ISA eight channel 192kHz A-D converter outperforms every other converter yet devised, and is the first audio A-D converter to utilise Burr-Brown Pro Audio Amplifiers and flagship PCM4220 A-D converter chips. With cutting-edge conversion technology seated within Focusrite custom analogue circuitry, the card delivers unparalleled performance; specifications include a dynamic range of 122dB and jitter less than 250 picoseconds.
Focusrite A/D Card ISA 428 / 828 - 8-channel 24bit/192kHz A/D converter for 2 ISA 428 or one ISA thomann 828 preamps. The eight channel 192kHz A/D converter utilises Burr-Brown pro audio amplifiers and flagship PCM4220 A-D converter chips. Dynamic range of 122dB and jitter less than 250 pico-seconds. The card can be retrofitted at any time and thanks to its convenient 25-pin thomann D-type connector, integrates seamlessly with ProTools HD as well as other popular hard disk recorders and mixing desks. Digital formats include an 8-channel single/dual cable AES/EBU and SPDIF output, as well as an 8-channel ADAT lightpipe (SMUX/SMUX2) output. Wordclock I/O is provided via thomann dedicated BNC connectors.