FCC ID: 2A73TDA803 Hybrid Integrated Amplifier

DA803S Hybrid Integrated Amplifier BLUETOOTH CONNECTION 1. Switch on Bluetooth function on smart devices and search for DA803 BT and CONNECT. 2. If the amplifier cannot be connected, please try to remove the previous saved devices and redo above step 1. ACCESSORIES 1. Power cord 2. USB Cable 3. Users Guide 4. Antenna ACCESSORIES Output Power Frequency Range S/N Ratio Output Impedance Input Source Bluetooth Version Bluetooth Name USB DAC Name Voltage Max. Consumption Power Tubes Dimension Weight 2x35W 20Hz - 20kHz 86db 4, 8 LINE IN, AUX, BLUETOOTH, USB DAC CSR4.0 SUPPORT APTX DA803 BT DA803 DAC 115/230AC 50/60Hz 120W 6N1, 6N2, 6E2 176 x 274 x 131 mm 4.5 kg 3 USERS GUIDE

Thank you for choosing DORCHASE DA803S Hybrid Integrated Amplifier Please take time to read this guide carefully before installing your speakers to this amplifier as it contains all the information you need to achieve optimal sound and performance. We highly recommend you retain both packaing and this Users Guide for future use. SAFETY REMINDER Cautions! To reduce the risk of electric shock, do not remove any screws of this amplifier. CONNECT TO THE SPEAKERS AND SOURCE 1. Before connecting the amplifier, make sure it is POWER OFF. 2. Make sure the connection of the amplifier and other equipments are 3. Connect the speaker wires to the amplifiers at the right terminals. 4. Assemble the Bluetooth Antenna pointing upwards. 1. Volume control 2. UV Meter 3. 3.5 jack 4. Input 5. Tube 6N2 6. Tube 6N1 7. Tube 6E1 8. LINE IN 9. PRE-OUT 10. AUX (3.5 jack) 11. Bluetooth Antenna 12. USB/DAC Connector 13. Right Speaker Out 14. Left Speaker Out 15. Power Switch 16. Fuel 17. 115V/230V Switch

(MUST SET THE CORRECT VOLTAGE BEFORE SWITCH-

ING ON THE AMPLIFIER Left Speaker 1 2 15.19 Labelling requirements. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. 15.21 Information to user. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. 15.105 Information to the user. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

-Reorient or relocate the receiving antenna.

-Increase the separation between the equipment and receiver.

-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

-Consult the dealer or an experienced radio/TV technician for help.

FCC ID: 2A73TDA803 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) this device may not cause harmful iterference, and (2) this device must accept any interference received, including interference that may cause undesired operation. prunay bey if CARRERAS!

Dorchase Industrial Limited 7/26/2022 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern:

We, the undersigned, hereby authorize (Shenzhen CTA Testing Technology Co., Ltd.) to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Clients signature:

Clients name / title : Vivian Cheung/ Manager Contact information / address: Flat 2A, 4/F, Block 4, Tai Ping Industrial Centre, 51A Ting Kok Road, Tai Po, NT, Hong Kong

Dorchase Industrial Limited 7/27/2022 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Hybrid Integrated AmplifierAND FCC ID:

2A73TDA803 To Whom It May Concern:

This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the

- Block Diagram

- Schematics

- Operational Description required to be submitted with this application be permanently withheld from public review. The above documents are company proprietary information that could never get into the possession of your competition. Please contact me if there is any information you may need. Sincerely, Clients signature:

Clients name / title : Vivian Cheung/ Manager Contact information / address: Flat 2A, 4/F, Block 4, Tai Ping Industrial Centre, 51A Ting Kok Road, Tai Po, NT, Hong Kong

Dorchase Industrial Limited Model Difference Model : DA803, DA803S All the models are the same circuit and RF module, except the model names. Regards Sincerely, Clients signature Sincerely, Clients signature:

Clients name / title : Vivian Cheung/ Manager Contact information / address: Flat 2A, 4/F, Block 4, Tai Ping Industrial Centre, 51A Ting Kok Road, Tai Po, NT, Hong Kong