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We know that the current output stage of a general amplifier consists of two amplification lines: one line handles the negative (negative half cycle) output signal, and the other tube processes the positive polarity (positive half cycle) output signal. This can minimize the quiescent current, but to drive 8~600 ohm headphones, it must have a large amplitude of voltage and current; there are 4 or 8 tube portable players on the market, but not working in Class A,There may be some distortion, called cross distortion. It appears at or near the zero crossing of the output signal. If the two branches of the circuit do not match exactly, crossover distortion often occurs. FA2 completely solved the above two problems and shared the circuit architecture: the digital receiver of FA2 adopts AK4497EQ DAC Chip, IV - Ti(BB) OPA1632-Fully Differential I/O Audio Amplifierr; OP adopts OPA1612 (bipolar-input operational amplifiers-completely independent circuitry for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded.), Toshiba 8-pair tube current amplification; among them, OP level (voltage, current amplification stage) adopts differential balanced output and works in Class A state; From DAC output to Toshiba 8-tube full direct coupling mode, ensuring high fidelity, High signal-to-noise ratio (FA1 signal-to-noise ratio (121db)), good dynamics without distortion; with good headphones, experience music playback in depth;
DAC Chip: AKM high-End DAC AK4497EQ. Toshiba high-fidelity 8-pair tube-type balanced amplifier circuit. Fully differential balanced amplifier TI (BB) OPA1632. Voltage amplifier dual op amp OPA1612 (class A). Supports more audio format, including Apple lossless audio format--m4a, aac, ogg; audio formats such as mp3, wma, DSD( dsf&dff up to DSD256); ape, flac 0~8 compression ratio ; Hard decoding ape (24bit, three levels of compression mode), wav (up to 32bit), flac (24bit, 0-8 level). FA2 Comes with Built-in EMMC high-speed memory chip, and can also support up to 512GB Extension Memory card (supporting exFAT or FAT32 file system). More functions support: Auto power off, Sleep-off, Favorites, EQ (HiFi mode is recommended), Fast forward mode , Return key customization (long press - screen ff or long press- return to the menu), Turntable customization (quick selection Or volume), Folder cycle, Car mode, multi-level Directory Management. Professional audio processing DSP chip, better control, which is not a single-chip STMF4 or STMF7 microcontroller can compare to. Continuous play for 9 hours under comprehensive test circumstance. Support car mode; (automatic booting after car start, automatic shutdown after stop). Battery with Polymer, high density, high temperature resistance, 4000ma 14.8Wh
Linsoul Audio is the authorized distributor. All products are authentic and genuine.
We are located in china but send our products worldwide for free.
We provide 1 year warranty for the all products except the cables*.
We reply to all support inquiries within 3 working days.
If everything goes right our system will automatically generate your order and send you a confirmation email. If you don't receive the confirmation email please double-check that it wasn't automatically stored in your spam or promotions folder.
Most of the items you see are in stock and ready to be shipped after 3 working days. If you plan to order a custom (Design or Fit) product, a pre-order, or a made to order item processing times may change on item to item basis.
Standard shipping is offered free worldwide for orders under $199 USD (with some exceptions), but please consider that delivery times may vary considerably depending on your country, up to 90 Days.
All items over $200 include free express shipping (DHL or similar). If your order total is under $200 you can manually add Express Shipping during the checkout period for $15.00 USD
We are generally able to ship to most countries via DHL Express, and many countries via Standard Shipping. You may clarify with our team to see whether Standard Shipping is available to your country.*Note: We can only do Standard Shipping for the UK, India and Russia. We can only do Express Shipping to Africa, Argentina, Hawaii, Kuwait, Mauritius, Montenegro and Sri Lanka, to name a few.
We have two shipping options - Standard Shipping and Express Shipping via DHL Express.
For in-stock products, your order will be shipped within 3 working days.
Customized items will take a longer time (do check in with our staff for more information).
On normal non-sale days, once your parcel has been shipped out:
For Standard Shipping, it takes about 2-3 weeks for items to be delivered after shipping out. For some countries, it might take up to 2-3 months, depending on your country and its customs. The duration for transit is something beyond our control. Linsoul will not be making refunds for such cases. Please consider an upgrade to DHL Express or keep the waiting time in mind.
For Express Shipping, it takes about 3-7 days for items to be delivered after shipping out.*Note: Timings might be affected due to festive seasons or other unforeseen circumstances
1. Kindly contact your local courier using the local tracking number. We will not process a refund or reshipment of the parcel since it has been shipped.
2. Customers are to bear the consequences and fees incurred, if the parcel was undelivered due to any of the following situation:
Customers have to bear any form of custom/import/processing fees that are applicable for your parcel.
Should you be unwilling to pay for the fees and reject the delivery of the parcel, you will still have to pay for the shipping cost. Linsoul will only refund the amount of your order after deducting the shipping cost incurred.
For faulty/missing items, please send an email to firstname.lastname@example.org to process warranty. In your email, please choose an appropriate Subject Title. Kindly include your Order Number, and state your issue clearly. Please also attach photographs/videos as “proof”, if any.
Our team aims to review your email within 3 working days.
For other queries, the fastest way to contact us is via Discord: https://discord.com/invite/5yfHcAu
Please kindly check the following guide first: CIEM Ordering Guide
After placing an order, you will receive the order confirmation email. After your order has been shipped out, you will also receive a tracking email. You can track your order via the tracking number online. Should you not have received the emails or face any difficulties tracking your order, please kindly contact us for support.
We collaborate with 4PX, UBI, SF Express and DHL Express.