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B4-X is a dual-mono balanced version. Its left and right channel are amplified by independent components, and power supply, tubes, and op amp are all independent and symmetric. So the degree of sound separation is higher than B4.
B4-X adopts 2 groups of independent power supply(+12V and -12V) for 2 op amps, less mutual effects and can drive 300Ω headphones.
The circuit adopts dual op amp parallel output, with higher output power.
B4-X has 3.5mm and 2.5mm 2 kinds of output interface, suitable for most of balanced and standard headphones.
Built-in tube makes you have a tube amplifier which can be held by one hand, convenient to carry and can enjoy HiFi music everywhere. Full, delicate and soft sound: warmer than transistors, independent op amp and power supply inhance the SNR and degree of separation, less interplay and higher sound quality.
Battery lets your listening feast without time limitation. It can't be turned on during charging and will power off automatically after fully charged, and charger LED will turn to green.
Using gold-plated socket, original nichicon electrolytic capacitor, original DALE resistors and precision ring resistance.
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.
I'm not an audiophile person, but I enjoy music and iem's, but what I can say about this tube amp, it works! It amplifies and it improves the sound signature on almost all of my iem's, and it being balanced(2.5jack) really makes everything much better, I own about 15 iem's but the ones I really notice a major improvement in sound over just plugging it straight into the pc are the Shozy Form 1.1 and the Semkarch CNT1, the bass hits harder, the clarity is improved, and it warms everything up and smooths things out, kinda hard to explain, but I notice it. It gets slightly warm, overall it's a nice entry step into tubes without blowing alot of money to see if this is a flavor of something you might like. The only downfall, it has to be recharged after about 4 hours of using, but that goes without saying as these have a pretty good output of power.
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 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).
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
You have to bear any form of custom/import fees that are applicable for your order.
Should you be unwilling to pay for the fees and reject the delivery of 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.