A. The purpose Unlike the review tour we carried out before, this time is a little bit different. As the name preview indicates, the main purpose of the tour is to collect pre-sales feedback prior to the official release including: a. To collect your kind suggestions regarding the sound quality of K3 when comparing to the E10K and Q1 Mark II; b. To kill any potential software bugs or hardware hidden troubles with your comments before it goes to mass production. Note: After the preview, please kindly PM us @FiiO here on Head-Fi to submit your suggestion or comments about the K3. B. How to apply? So how to be qualified for the preview tour? Make sure the following requirements are satisfied : 1. You should either have a FiiO E10K or FiiO Q1 Mark II; 2. You are fully understand that the K3 is a desktop device that is to use with the computer; 3. You should possess at least one IEMs and one overhead headphones; When the above 1.2.3 are met, you can get priority if you ever had using experience with other desktop DAC/amplifier worth about $100~200. Please apply by replying to this thread and including the following information in your reply: •-Do you have a FiiO E10K or FiiO Q1 Mark II? •-Any other DAP(s) / DAC(s) / amp(s) you may possess: •-Headphone(s) / earphone(s) you possess: •-Your geographical region (e.g. the city and country you live in): C. About the K3 As it’s said, K3 (previously called E30) is a HiFi USB DAC/amplifier. When it is connected to the computer via USB, it handles the transmission of high quality audio signal and get it amplified. It outperforms other USB DACs for its high sound quality and support to high sampling rates. FYI, after the K3 hit the market, it will be on sale along with the E10K so as to give the users one more option for different demands. 1. Main ports and buttons: * USB Type-C port: for digital audio transmission and power supply * 3.5mm line output port * 3.5mm single-ended headphone output port * 2.5mm balanced headphone output port * Coaxial output port * Optical output port * Volume knob with on/off function * Bass switch * Gain switch * USB1.0 (driver-free) * Working indicator 2. Main features * USB DAC: Supports up to 384kHz/32bit * Power supply via the USB port: Convenient and safe * High-performance discrete built-in DAC chip * Various ports: Lineout, single-ended / balanced headphone output, coaxial, optical and so on. * High-performance discrete headphone drive and circuit protection * Built-in power filtering and switching circuit for purer audio output * Gain and bass to meet different listening requirements 3. Electronics solution composition: * XMOS XUF208 for USB data exchange: being compatible with USB 2.0 and USB1.0; * OPA926 as the headphone amplifier chip: low distortion and noise, to increase the front driver and for a more convenient tuning; * AKM AK4452 as the DAC chip: supports high sampling rates signal, high SNR and low distortion; * TI OPA1642 as the LPF: to drive the line output; * Comes with gain switch, voltage amplifying and active Bass circuit. 4. More details: 5. The comparison between the K3 and the E10K: D. About shipping info: • Depending on the geographical distribution of selected previewers, FiiO will ship out several K3s, one or more to Previewers in each region e.g. USA, Europe, SE Asia, Pacific region, etc. so that shipping costs from one reviewer to the next is kept low. • FiiO will pay for shipping to the first reviewer and any customs taxes / import duties that may result from the K3 crossing countries. • Preview application period: Starting now! And accepting applications until further notice! • First list of previewers to be announced: To be confirmed. • Beginning of shipment of review the K3: To be confirmed. E. Preview regulations (subject to change before the tour commences) * Previewers should keep the K3 for at most 10 days before shipping to the next reviewer. * Previewers should ship the K3 to the next reviewer by registered post requiring signature in the padded box provided. * Previewers will not be held responsible for any damage to the K3 sustained during shipping or normal usage. * Previewers are reminded to listen responsibly and safely to the K3, to not use it when operating machinery or driving, and not to drive headphones to excessive volume with the K3. * Please contact FiiO in advance if you have any difficulties with the K3 in the course of your preview, so we may help you resolve it if possible. Last but not least, you are allowed to share the picture of K3 and your using experience freely. And please kindly PM us @FiiO here on Head-Fi to submit your suggestion or comments about the K3. Thank you! PS. In order to avoid any potential confusion or misunderstanding , please DO NOT reveal the screen print on the back of the K3, since it would be slightly different from the mass production. Best regards, FiiO Electronics Technology Co., Ltd.