Good sound comes from good electronic components
The pre-stage tube adopts the American RCA metal encapsulation tube 6SH7 in the 1940s; the Swedish original customized Lundahl headphone amplifier special output; the British original custom-made power transformer; the coupling capacitor uses the German Mundolfo silver foil oil-immersed capacitor; The fever level Jinwei resistor is used; the signal switching switch and the volume control encoder are all made of ALPS fever products.
ES9038pro decoder chip
Adopt ESS company decoder chip ES9038PRO, ultra low distortion, high signal to noise ratio, large output current. The system clock uses an ultra-low phase jitter US Sitime active quartz crystal with a phase jitter of less than 0.5px. Regardless of the format of the LD-A1, the sampling frequency is high, which ensures smooth and phase-locked decoding.
2A3 ultra low distortion amp
LD-A1 with American RCA antique tube 6SH7 + Svallock JJ 2A3 single-ended pure class A ultra-low distortion headphone amplifier, the output power reaches 5W rms, the overall sound field, positioning, air feeling is unforgettable.
The LD-A1's full-range analysis is excellent, and it is modern, pursuing analytical and dynamic styles. Transient response is especially good, listening to any music will give a refreshing and transparent feeling.
The LD-A1 adopts the design of the power supply cow and the host split. The channels do not interfere with each other. The balance sensor and the extremely sensitive headphones can not hear the noise.
Front board schematic
1, the power switch
2, input selection
4, 6.35 headphone output
5, the volume knob
6, 4-core XLR balanced headphone output (large)
Rear board schematic
1, TOS fiber input
2, USB input
3, I2S input
4, COAX coaxial input
5, 6 XLR balanced output right and left
7, 8 RCA single-ended output right and left
9, cable input
DSD64, DSD128, DSD256, DSD512 (2.8224-22.5792 MHz)
Decoding frequency response: 20Hz-20KHz+/-0.2dB
Amp frequency response: 5Hz-80KHz+/--1dB
Decoding dynamic range: DNR 132dB
32 ohm 3W
120 ohm 2W
Power consumption of this machine: 95VA
Volume: 350*290*230 (including tube height) mm
1) What headphones is it suitable for?
LD-A1 is suitable for all kinds of high and low impedance HIFI dynamic ring headphones and flat earphones with a price above 1500 yuan. It is not suitable for electrostatic headphones.
2) What style of music is it suitable for?
The LD-A1 is suitable for a variety of musical styles such as classical, jazz, rock, pop, folk and more.
3) Front-end music equipment:CDs, digital broadcasts, computers, and mobile phones with digital output can all be used as sound sources.
4) The own enthusiast can replace the op amp of the decoder part, the coupling capacitance of the amp part, etc., but it is not recommended for the novice DIY.
Worldwide Free Shipping on SHENZHENAUDIO, Please allow 1-3 business days for conduct Quality Control in order to ensure the products quality.
If a customer would like the order reshipped, they’ll be charged a reshipment fee. Customers may also be subject to a restocking fee of up to 20 percent of the product cost.
Which Couriers To Use?
Given the amount of shipping partners we work with and the vast coverage area we serve, there are likely regions with much longer transit times than others. If you have any feedback, suggestions, or problems with the courier of your shipment, please feel free to submit a support ticket via the "Contact Us" button below.
Our goal is to provide our customers with the best shipping experience possible at a reasonable cost. This is why we constantly negotiate with existing shipping partners for lower rates and actively test new couriers for potential opportunities.
PO boxes or APO/FPO
The ability to ship to PO boxes or an APO/FPO address depends on the item's weight. If an item weighs more than 9 pounds, we won’t be able to ship to these addresses because of our current courier agreements.
To determine if your order is eligible for shipment to PO boxes or an APO/FPO address, please contact SHENZHENAUDIO Support.
Estimated Delivery Time
For customers in the continental United States:
5 to 14 business days from the date of shipping
For customers in Hawaii and Puerto Rico:
2 to 4 weeks from the date of shipping
International customers can expect longer shipping times, depending on the country in which they live:
Canada: 1 to 3 weeks from the date of shipping
Australia, New Zealand, Germany, France, and the UK: 2 to 4 weeks from the date of shipping
Other countries not listed above: 3 to 6 weeks from the date of shipping
Please keep in mind that these are rough estimates and shipments can be delayed due to unforeseen circumstances, like postal strikes or severe weather.
If, for some reason, you don’t receive your order within the estimated time frame provided above and suspect that it might be lost in transit, please submit a support ticket from your transactions page and we can look into the order with the courier. Lost-in-transit requests must be submitted to SHENZHENAUDIO Support within 4 months of the date of shipping or before the courier archives the tracking information.
Easy 30-Day Return Policy
If you are dissatisfied with your purchase for any reason, you may return it to SHENZHENAUDIO within 30 days of the received date, subject to the conditions and exclusions below.
Please read conditions below. If all conditions are not met, SHENZHENAUDIO reserves the right to refuse the return. All returned items must be in new condition, in their original unaltered box (including an intact UPC code) and must include all packing material, blank warranty cards, manuals and accessories. SHENZHENAUDIO can only refund the original purchase price. Shipping and handling fees are nonrefundable.
Defective or Damaged Items
Defective items may be repaired, exchanged or refunded at our discretion for the same model or manufacturer's equivalent model.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary. Please allow 3-5 business days for mail-in exchanges to be processed.
Refunds & Credits
Once we receive and inspect your item(s), we will credit your account. Please allow 5-7 days for a credit to appear on your account. In most cases, we will issue your refund in the same way you made the original purchase. Please note: we can only refund the original purchase price. Shipping and handling fees are nonrefundable.
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
ShippingTo return your product, you should mail your product to: 4F 405, Building F, No.2 Shangxue Science and Technology North, Bantian Street, Longgang Dist, ShenZhen, 518129 Guangdong, China
If you’ve done all of this and you still have not received your refund yet, please contact us at firstname.lastname@example.org.