Four-way crossover for mobile phone earphone earphone earbud earphone

Wired in-ear Earphone Headphone Headset by CNC Precision MachiningDM7: Six Driver BA IEMNew design - easy to drive 3D printing technologyGerman medical-grade resinKnowles + Sonion 6BA4-Way Crossover + 4 sound boreCustomized IEM  3D printed resin cavity shell Germany Envision TEC 3D printin

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Mobile Phone in-Ear Headset Headphone Earbud Eeaphone with Four-Way Crossover
Mobile Phone in-Ear Headset Headphone Earbud Eeaphone with Four-Way Crossover
Mobile Phone in-Ear Headset Headphone Earbud Eeaphone with Four-Way Crossover

Mobile Phone in-Ear Headset Headphone Earbud Eeaphone with Four-Way CrossoverMobile Phone in-Ear Headset Headphone Earbud Eeaphone with Four-Way CrossoverMobile Phone in-Ear Headset Headphone Earbud Eeaphone with Four-Way CrossoverMobile Phone in-Ear Headset Headphone Earbud Eeaphone with Four-Way CrossoverMobile Phone in-Ear Headset Headphone Earbud Eeaphone with Four-Way Crossover

Wired in-ear Earphone Headphone Headset by CNC Precision Machining

DM7: Six Driver BA IEM
New design - easy to drive

3D printing technology
German medical-grade resin
Knowles + Sonion 6BA
4-Way Crossover + 4 sound bore
Customized IEM
 3D printed resin cavity shell
 Germany Envision TEC 3D printing equipment.
PMMA acrylic fiber is made of medical-grade material, which improves the high temperature resistance and impact resistance. The left and right channel error is within 1dB, creating a cost-effective class of custom headphones.
 4-Way Crossover + 4 sound bore
 Integrated with professional 4-Way Crossover + 4 sound bore, the 6 balanced armatures are linked to each other to present a balanced sound in all three key areas - bass, midrange and treble.
High frequencies offer a beautiful sense of air.
Low frequencies are well balanced with good speed. They are great both for critical and casual listening.
Clear imaging allows precise positioning and offers a superb sense of layering, bring you auditory enjoyment.
Knowles SWFK-31376
Knowles ED-29689

Sonion 33AP007
Knowles CI-22955
 Sophisticated processing 4-Way Crossover technology
DM7 adopts the industry standard 4-Way crossover technology, the drivers transmits sound waves through 4 separate channels equipped with 3 Knowles filters and 1 patented acoustic damper, which divide the extremely high, high, medium and low frequencies. It makes the overall curve smooth and coherent and the sound real and vivid, removing any fatigue even when listening for a long time.
low frequency channel
Intermediate frequency channel
Medium high frequency channel
Extremely high frequency channel
High quality MMCX interface
DM7 use the MMCX standard to connect the cable, as it can effectively solve the problem of earphones becoming useless because the cable breaks, and it also allows to change the tuning through the cable and provides more options to upgrade the cable.
 Pluggable MMXC interface
 Audiophile Cable
 Stock cable is an 8-core mixed single crystal copper + single crystal copper silver foil wire: not only does it allow for lossless signal transmission with improvements to sound quality, it also is good enough to no longer make you worry about upgrading.
 Customized wearable experience
The ergonomic design allows the earpiece to fit the ear canal, avoiding discomfort even after a long time, also dispersing ear pressure, so as to let you enjoy the fun of music. We partnered with Siemens to access their ear canal database: we analysed and compared data on tens of millions of ear canals to obtain earpieces that fit the human ear perfectly.
Hi-res high quality audio certification
DM7 has been certified by Japanese Audio Association as "Hi-Res Audio", bringing you a listening experience beyond CD level.
 Wearing diagram
Make sure to distinguish the right and left earphones. Pay attention to the "blue" and "red" marks on the wires. Blue is for the left ear and red is for the right ear.
Insert the earphone straight into the ear, slightly rotate it until it fits the ear.
Hold the earphone cord behind your ear
Press and hold the earpiece to adjust the seal
Adjust the earphone cable to fix the earphone
Congratulations, you can start your DM7 music journey!
Product parameters & standard accessories
Driving unit: six balanced armature units
Sensitivity: 115dB SPL/MW
Input impedance: 13.5 Ω
Frequency response: 10 Hz-40 kHz
The distortion rate: ≤0.5%(1 KHZ)
Cable length: 1.2m ±5%
Weight: around 5.3g
Cable: Single crystal copper + single-crystal silver-plated copper wire
Standard equipment: vocal sleeve S/M/L, equalizing sleeve S/M/L, packing package X1, brush X1
 Knowles BA SWFK-31376
Knowles BA ED-29689
Sonion BA: 33AP007
MMCX Connector
Customize Tuning PCB
Knowles BA CI-22955
German medical grade resin shell
Customized 4-way sound tube
3 Knowles Filter
1 Customized filter
 Carefully calibrated frequency response curves
The overall curve is balanced, pleasant and very natural
DM7 is rich in details in the vocal area, which is soft and never piercing. High frequencies are  beautifully rendered with a strong sense of air.
Low frequencies are just right in their presence, with good speed. They are appealing both when you want to concentrate on music and when you just want to have fun.

Features of CNC parts
1. Precision CNC parts strictly according to customers' drawing,packing and quality request
2. Tolerance: Can be kept in +/-0.003mm
3. 100% inspection during production to ensure the quality
4. Experienced technology engineers and well trained workers
5. Fast and timely delivery. Speedy & professional service
6. Give customer professional suggestion while in the process of customer designing to save cost.
7. Customers can use PAYPAL and other online payment platform to pay a small amount of sample fee to shorten the sample production time
8. Quality assurance in accordance with ISO9001
MaterialStainless SteelSS201,SS303,SS304,SS316,SS416,SS420,17-4PH,SUS440C
Steel Q235,C20,C45(K1045),1214,1215
BronzeC51000, C52100, C54400,CuSn8
Alloy SteelSCM435,10B21
OthersAccording to customers' requirements
ProcessingCNC machining, CNC milling and turning, drilling, grinding, stamping, tapping,bending
FinishAnodizing ,Heat treatment, polishing, powder coating, galvanized, electroplating, spraying, and painting
DimensionsAccording to customer's drawing
Drawing FormatPDF/JPEG/AI/PSD/CAD/Dwg/Step/LGS
QC Policy100% inspection and random inspection before shipment, with QC passed label
StardardMaterials and surface treatment comply with RoHS/Reach Directives
Processing EquipmentsCNC machining center, CNC milling machine, Drilling machine,grinding machine, CNC machining Puncher,
Milling machine,CNC wire-cut machine,Charmfering machine;
Testing EquipmentsCMM, Projector, Pull Tester, Automatic Optical Inspector, Salt Spray Tester, Durometer, Tensile Machine
Application Automation machine, medical device, industrial machine, automobile, electric appliance, robot, computers, tele-communication,and other industries
PackagingPE bags or bubble bags, boxes, cartons, pallet or as per customers' requirements
Trade TermsEXW, FOB, CIF, As per customers' request
Payment TermsPaypal or Western Union for sample orders; Larger amount by T/T with 30% as deposit,70% before shipment
Delivery TimeWithin 15-20 working days after deposit or payment received
Shipping PortsFOB Shenzhen(recommended), or Guangzhou, or Hong Kong

Dongguan Baisheng Precision Technology Co., Ltd was founded in 2010. To realize the enterprise value pursuit and competition strategy, in 2016, the factory was overall moved to Chang'an Town, Dongguan City known as "world factory". It's a high-tech enterprise integrated with R&D, production, sales and service etc. We mainly commit to the CNC precision parts for industries such as industrial robots, drones, smart home, new energy car, automation equipment etc. We have many years' experience of market research and development on 3C consumer electronic products as well as product appearance patent and overall scheme.

We registered capital with RMB6000000 with a workshop of 5000 square-meter and over 100 high-qualified professional employees including R&D team 20 engineers and technicians. We facilitate with 50 sets of China top Taikan CNC drilling and tapping machines, 30 sets of LK vertical and horizontal nano-injection molding machines, 1 set of height cone, 1 set of quadratic element, 1 set of Germany Edwardian coordinate measuring instrument and large quantities of auxiliary toolings.

We stick to the company principle of quality first, service first, continuous improvement and innovation to meet the customers' demands as well as the quality objective of zero defect, zero complaint. To realize the win-win business cooperation, we're always devoting ourselves to providing the customers with qualified products at the reasonable prices.

Welcome your OEM or ODM projects.

Company Philosophy: Innovation is fundamental, quality is life, pragmatism is the purpose, efficiency is the goal.


Q1. Are you a genuine manufacturer?
Yes, all the products are produced in our ISO9001:2008 certified factory; We are also a company registered by China Customs with the right to export and import.

Q2. What should I offer to get your quotation?
Please offer us your detailed information for the product, such as drawings with 2D/3D by software Pro/E, Auto CAD, SolidWorks, UG etc; as well as materials, surface treatment, quantity, package. Any special requirements should be highlighted especially for tolerance.

Q3. Can we get a complete product besides CNC parts?
To some extent, yes, we can. But firstly we need assess feasibility.

Q4. What's your top process tolerance?
Now our top process tolerance is ± 0.003mm.

Q5. What are your sample policy and trade/payment terms?
We can offer the free samples with total value less than USD10; while the buyers should bear shipping cost and import VAT. 
Ex-works, FOB Shenzhen/Guangzhou/Hong Kong, CIF etc. would be OK for us.
As for the payment, small value is recommended by Paypal or Western Union; larger amount by T/T, 30% as deposit, 70% before shipment.

Q6. How about the warranty?
The warranty is for 1 year. As you know, our CNC parts have a long lifespan except for damaged by operating inappropriately.

Q7. What's your policy for RMA?
All defective products should be confirmed by us based on the customers' RMA list and photos first, then we'd like to refund the money or compensate the goods by free of charge accordingly.

Q8. I want to keep our design in confidence; can we sign NDA?
Sure, to protect customers' profit is our obligatory responsibility, signed NDA would be valid to both of us.
What benefit we can get from you?
1) Competitive price
2) High quality control : 100% full inspection before shipment
3) High precision, tolerance can be ± 0.003mm
4) Fast lead time (5-7days for samples, 12-15 days for mass production)
5) Non-standard//OEM//customized service provided
6) No MOQ, small QTY is acceptable.
7) Factory ISO 9001 certification, ROHS material used
9) Professional export packing: separate Blister plastic box or Bubble Wrap/Pearl Wool +Carton+ Wooden Case, keep no scratch and damage

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