2BTUS-DA1digital bluetooth amplifier

DA1 纯数字功放 11 产品简介产品简介 包装清单包装清单 感谢您购买 DA1 纯数字功放。 DA1 是市面少见的纯数字 HIFI 功放，既不是放大模拟信号，而是 使用 DSP 技术直接放大数字信号 , 本机可以 USB 连接通过 XMOS 界面或 QCC3084 蓝牙提供高品质的数字信号再直接放大就可以欣赏到非常好的音 质，省略了数模转换（DAC）的过程，从根本上解决了 D 类功放一直以来 听感差的缺点，DA1 既有媲美传统 A 类功放温暖浑厚的听感，又有 D 类干 净透明的声音特点，得益于超低的内阻设计对音箱的控制力也是远强于同 尺寸的功放，特别设计专业设备才会拥有的 15 段 DSP EQ（每一段可以控制 ±12dB），可以个性化定制自己喜欢的任何声音风格而不损失音质，高成本 的一体成型铝合金外壳，无论是外观，功能还是音质都可以说是同价位鹤立 鸡群般的存在。 再次感谢您对 DA1 的支持，愿它为您的音乐之旅增添更多乐趣。 DA1 纯数字功放电源线 遥控器USB 线 用户手册 22 规格参数规格参数 机器型号DA1 纯数字功放 输入RCA，同轴，光纤，USB，蓝牙 功放芯片德州仪器 TI TAS5825M X 2 额定功率100W X 2 4Ω ，60W X 2 8Ω 信噪比≥ 105dB 动态范围≥ 105dB 失真度≤ 0.05% 蓝牙芯片QCC3084 USBXU216 采样率 USB 24bit/96kHz OPT/COAX 24bit/96kHz 尺寸198 X 42 X 176MM（宽 X 高 X 深） 含包装净重1.3kg 33 25HZ~16KHZ 有 15 段可选择，每 一段可以调整土 12dB，最右边的 OK 选项退出 可以保存三段 EQ V o l u m e / S e l e c t 输入选择 EQ调整 SELECT INPUT EQ SET RETURN 16KH Z OK2 B d EQ 设置EQ 设置 菜单说明菜单说明 44 静音 菜单 / 选择 返回 音量选择 输入选择 3 4 1 2 5 短按/熄屏 长按/关机 产品概览产品概览 屏幕音量 / 菜单选择 COAX 同轴输入 USB 输入 OPT 光纤输入 RCA 输入 3.5mm 低音炮输出 喇叭输出 电源开关 /AC100~240V 电源输入 V o l u m e / S e l e c t 12 55 3 4 5 6 7 8 9 21 产品保修产品保修 无法享受“三包”服务的情况 :无法享受“三包”服务的情况 : 保修方式 :保修方式 : 产品自售出 7 日内 , 在正常使用情况下出现故障 , 客户可以无条件退换货。 正常使用一年内出现故障 , 可以免费保修。购买日期以发票或收据日期为准 , 网上购买按订单日期为准。 1. 一切人为因素损坏 , 包括但不限于非正常工作环境下使用或者不按照说明 书使用的 ; 2. 用户私自拆机、改装以及维修的 ; 3. 使用非指定或许可的配件造成损坏的 ; 4. 不能出示有效购机凭证的 ; 5. 不属于本公司产品的。 保修方式为送修 , 此条款只适用于官方销售渠道售出的产品 , 其他渠道请参 考销售代理商的规定和当地国家法规关于质保的规定。 66 ①干净的人声，低切 100Hz 以下。 ②人声的基频一般在 100-300Hz。 ③基频处理不当会影响人声的情绪。 ④适当提升基频可以使人声变得浑厚。 ⑤衰减基频会让人声变得薄脆。 ⑥对于有些歌手来说，基频是他的特色 , 过分衰减会让他失去辨识度！ ①中频 (1.5-3KHz)，提升会增加辨识度。 ②人声咬字不清晰，可以通过 2kHz 左 右改善。 ③适当提升 2.5kHz 左右可以让人声更靠 前、贴耳。 ④最核心的人声区域，可以用大的频宽 进行提升。 ①人声中低频 (300-600Hz)，提升会让人 声变得温暖。 ② 过分提升会让人声变得浑浊，鼻音重 闷、产生盒子音。 ③ 适当衰减会让人声变得干净，消除鼻 音，提升通透感。 ④过分衰减会让人声变单薄，淹没在音 乐中，不融合。 ⑤记得用窄一点的频宽横向扫频精准位 置适当衰减。 1 2 100 - 300 HZ 基频 300 - 600 HZ 中低频 1500 - 3000 HZ 中 频 EQ 调音参考EQ 调音参考 77 ①超高频 (10kHz 以上 ) 空气感，人声质 感。 ②提升 10kHz 以上会让人声获得颗粒感。 ③提升 14kHz 以上会让人声获得呼吸感。 ④过分提升超高频，会让人声产生毛刺 感。 ①人声中高频 (3k-6kHz) 提升会增加人 声刺激度。 ② 3.5kHz 是人耳最敏感的频率，需要轻 微的处理。 ③中高频常常是人声齿音比较聚集的频 段。 ④可以用小的频宽适当衰减齿音很明显 的频段。 ①高频 (6k-10KHz) 提升会增加人声清晰 度。 ②衰减人声的高频会让人声逐渐变远， 不清晰。 3000 - 6000 HZ 中高频 6000 - 10000 HZ 高频 10000HZ以上 超高频 EQ 调音参考EQ 调音参考 88 99 DA1 使用场景DA1 使用场景 V o l u m e / S e l e c t 客厅电视通过 COAX,OPT 连接 DA1 数播 / 解码器通过 COAX，OPT，RCA 连接 DA1 手机通过蓝牙连接 DA1 电脑通过 USB 连接 DA1 V o l u m e / S e l e c t V o l u m e / S e l e c t XMOS USB (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation. FCC Radiation Exposure Statement: The equipment complies with FCC Radiation exposure limits set forth for uncontrolled environment. This equipment should be installed and operated withminimum distance 20cm between the radiator and your body. 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. FCC Radiation Exposure Statement: The equipment complies with FCC Radiation exposure limits set forth for uncontrolled environment. This equipment should be installed and operated withminimum distance 20cm between the radiator and your body. computer or peripheral devices). This equipment 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. FCC Radiation Exposure Statement: The equipment complies with FCC Radiation exposure limits set forth for uncontrolled environment. This equipment should be installed and operated withminimum distance 20cm between the radiator and your body. 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. To assure continued compliance, any changes or modifications not expressly approved by the party. Responsible for compliance could void the user’s authority to operate this equipment. (Example- use only shielded interface cables when connecting to computer or peripheral devices). This equipment 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. FCC Radiation Exposure Statement: The equipment complies with FCC Radiation exposure limits set forth for uncontrolled environment. This equipment should be installed and operated withminimum distance 20cm between the radiator and your body. 10 99 Amplifier SceneAmplifier Scene V o l u m e / S e l e c t The living room TV is connected to DA1 through COAX and OPT Music Streamer connects to DA1 through COAX, OPT, RCA Mobile phone connects to DA1 via Bluetooth Computer connected to DA1 via USB V o l u m e / S e l e c t V o l u m e / S e l e c t XMOS USB ① Ultra high frequency (above 10kHz) air feel and vocal texture. ② Raising the frequency above 10kHz will give the voice a grainy sensation. ③ Raising above 14kHz will give the human voice a sense of breathing. ④ Excessive increase in ultra-high frequency can create a sense of spiciness in vocals. ① The increase in high-frequency (3k-6kHz) in human voice will increase the stimulation level of human voice. ② 3.5kHz is the most sensitive frequency of the human ear and requires slight processing. ③ Middle and high frequencies are often the frequency bands where human and dental ① The increase in high frequency (6k-10KHz) will enhance the clarity of human voice. ② Attenuating the high frequency of human voice will gradually make it farther away and less clear. 3000 - 6000 HZ Medium-high Frequency 6000 - 10000 HZ High Frequency Above 1…

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FCC ID:2BTUS-DA1 TB-RF-074-1.0 Appendix III EUT External Photographs Photo 1 Appearance of EUT Photo 2 Appearance of EUT FCC ID:2BTUS-DA1 TB-RF-074-1.0 Photo 3 Appearance of EUT Photo 4 Appearance of EUT FCC ID:2BTUS-DA1 TB-RF-074-1.0 Photo 5 Appearance of EUT Photo 6 Appearance of EUT

FCC ID:2BTUS-DA1 TB-RF-074-1.0 Appendix I Label Appendix II Label Location FCC ID:2BTUS- DA1 Model: DA1

FCC ID:2BTUS-DA1 TB-RF-074-1.0 Appendix IV EUT Internal Photographs Photo 7 Internal of EUT Photo 8 Appearance of PCB BT Ant. FCC ID:2BTUS-DA1 TB-RF-074-1.0 Photo 9 Appearance of PCB Photo 10 Appearance of PCB FCC ID:2BTUS-DA1 TB-RF-074-1.0 Photo 11 Appearance of PCB Photo 12 Appearance of PCB FCC ID:2BTUS-DA1 TB-RF-074-1.0 Photo 13 Appearance of PCB Photo 14 Appearance of PCB

Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202508-0154-5 Page: 1 of 8 TB-RF-074-1.0 1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China Tel: +86 75526509301 Fax: +86 75526509195 Maximum Permissible Exposure Evaluation FCC ID: 2BTUS-DA1 Report No. : TBR-C-202508-0154-5 Applicant : HuiZhou LL Audio Technology Co.,Ltd Equipment Under Test (EUT) EUT Name : digital bluetooth amplifier Model No. : DA1 Series Model No. : N/A Brand Name : AOAOHT Sample ID : HC-C-202508-0154-01-01 Receipt Date : 2025-09-15 Test Date : 2025-09-15 to 2025-12-24 Issue Date : 2025-12-24 Standards : FCC Part 2.1091 Test Method : KDB 447498 D01 General RF Exposure Guidance v06 Conclusions : PASS In the configuration tested, the EUT complied with the standards specified above. Test By : Lily zhang Reviewed By : Henry huang Approved By : Ivan Su This report details the results of the testing carried out on one sample. The results contained in this test report do not relate to other samples of the same product. The manufacturer should ensure that all products in series production are in conformity with the product sample detailed in the report. Report No.: TBR-C-202508-0154-5 Page: 2 of 8 TB-RF-074-1.0 CONTENTS CONTENTS ............................................................................................................................................. 2 1. GENERAL INFORMATION ABOUT EUT.............................................................................. 4 1.1 Client Information ................................................................................................................. 4 1.2 General Description of EUT (Equipment Under Test) ................................................... 4 2. MEASUREMENT UNCERTAINTY .......................................................................................... 5 3. TEST FACILITY.......................................................................................................................... 6 4. METHOD OF MEASUREMENT FOR FCC............................................................................ 7 5. TEST RESULT............................................................................................................................ 8 Report No.: TBR-C-202508-0154-5 Page: 3 of 8 TB-RF-074-1.0 Revision History Report No. Version Description Issued Date TBR-C-202508-0154-5 Rev.01 Initial issue of report 2025-12-24 Report No.: TBR-C-202508-0154-5 Page: 4 of 8 TB-RF-074-1.0 1. General Information about EUT 1.1 Client Information Applicant : HuiZhou LL Audio Technology Co.,Ltd Address : Room 305, Jinhui Building, No. 130, Chenjiang Avenue, Chenjiang Sub-district, Zhongkai High-tech Zone, Huizhou City, Guangdong Province, China Manufacturer : HuiZhou LL Audio Technology Co.,Ltd Address : Room 305, Jinhui Building, No. 130, Chenjiang Avenue, Chenjiang Sub-district, Zhongkai High-tech Zone, Huizhou City, Guangdong Province, China 1.2 General Description of EUT (Equipment Under Test) EUT Name : digital bluetooth amplifier Models No. : DA1 Model Different : N/A Product Description : Operation Frequency: Bluetooth&BLE: 2402MHz~2480MHz Modulation Type: Bluetooth&BLE: GFSK, Pi/4-DQPSK, 8DPSK Antenna Gain: 3dBi FPC Antenna Power Rating : AC Input: 100-240V~, 50/60Hz Software Version : V1.0 Hardware Version : V1.0 Remark: The above antenna information is declared by manufacturer and for more detailed features description, please refer to the manufacturer's specifications, the laboratory shall not be held responsible. Report No.: TBR-C-202508-0154-5 Page: 5 of 8 TB-RF-074-1.0 2. Measurement Uncertainty The reported uncertainty of measurement y±U，where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2，providing a level of confidence of approximately 95 %. Test Item Parameters Expanded Uncertainty (ULab) Conducted Emission Level Accuracy: 9kHz~150kHz 150kHz to 30MHz ±3.50 dB ±3.10 dB Radiated Emission Level Accuracy: 9kHz to 30 MHz ±4.60 dB Radiated Emission Level Accuracy: 30MHz to 1000 MHz ±4.50 dB Radiated Emission Level Accuracy: Above 1000MHz ±4.20 dB Temperature / ±0.6°C Humidity / ±4% Supply voltages / ±2% Time / ±4% Report No.: TBR-C-202508-0154-5 Page: 6 of 8 TB-RF-074-1.0 3. Test Facility The testing report were performed by the Shenzhen Toby Technology Co., Ltd., in their facilities located at 1/F., Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. At the time of testing, the following bodies accredited the Laboratory: CNAS (L5813) The Laboratory has been accredited by CNAS to ISO/IEC 17025: 2017 General Requirements for the Competence of Testing and Calibration Laboratories for the competence in the field of testing. And the Registration No.: CNAS L5813. A2LA Certificate No.: 4750.01 The laboratory has been accredited by American Association for Laboratory Accreditation(A2LA) to ISO/IEC 17025：2017 General Requirements for the Competence of Testing and Calibration Laboratories for the technical competence in the field of Electrical Testing. And the A2LA Certificate No.: 4750.01.FCC Accredited Test Site Number: 854351. Designation Number: CN1223. IC Registration No.: (11950A) The Laboratory has been registered by Certification and Engineering Bureau of Industry Canada for radio equipment testing. The site registration: Site# 11950A. CAB identifier: CN0056. Report No.: TBR-C-202508-0154-5 Page: 7 of 8 TB-RF-074-1.0 4. Method of Measurement for FCC 4.1 EUT Operation Condition: Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. 4.2 Exposure Evaluation: Equation from page 18 of OET Bulletin 65, Edition 97-01 S=(PG)/4πR 2 Where S: power density P: power input to the antenna G: power gain of the antenna in the direction of interest relative to an isotropic radiator. R: distance to the center of radiation of the ant…

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1 Telephone:0755-23205219OfficialWebsite:http://www.hxrf-antenna.com/ Address:Floors2-5,WestSideofBuildingC10,Xin'anNo.2IndustrialZone,GuxingCommunity,Xixiang Street,Bao'anDistrict,ShenzhenCity. PassISO9001QualityManagement SystemCertification CertificateNumber：76323Q10139R0S Shemzhenhongxintechnology electronicsCo.Ltd SPECIFICATIONFORAPPROVAL Nameofthecompany ： Nameofanarticle ： 2.4G&5.8GFPCantenna Materialcode ： HX-FPC25-4510-200B1 Customeritemnumber ： Specifications:Seethespecification Date ： 2024-06-13 Customercountersignature: DepartmentofEngin eering QualitydepartmentApprove ShemzhenhongxintechnologyelectronicsCo.Ltd: DepartmentofEngin eering QualitydepartmentApprove ZhuangweifengZhanghuanLiulu 2 Telephone:0755-23205219OfficialWebsite:http://www.hxrf-antenna.com/ Address:Floors2-5,WestSideofBuildingC10,Xin'anNo.2IndustrialZone,GuxingCommunity,Xixiang Street,Bao'anDistrict,ShenzhenCity. PassISO9001QualityManagement SystemCertification CertificateNumber：76323Q10139R0S 一：天线参数 DesignSpecificationsTypicalUnits 天线形式(Antennaform)FPCantenna 工作频率（workingFrequency）2400-2500/5000-5800MHZ 增益(Gain)3DBi 天线效率（Antennaefficiency）35~80% 电压驻波比（VSWR）<1.8 极化方式（Ploriaztion）verticalpolarization 辐射方向（Radiationpattern）omnidirection 馈电阻抗（impedance）50ohm 功率容量（Powerhandling）33dbm 天线接口（Interface）IPEX1 天线尺寸（Overaldimensions）45*10mm 重量（Weight）Norequirement 工作温度（OperatinTemp）-30-70°C 储存温度（StoringTemp）-30-70°C 3 Telephone:0755-23205219OfficialWebsite:http://www.hxrf-antenna.com/ Address:Floors2-5,WestSideofBuildingC10,Xin'anNo.2IndustrialZone,GuxingCommunity,Xixiang Street,Bao'anDistrict,ShenzhenCity. PassISO9001QualityManagement SystemCertification CertificateNumber：76323Q10139R0S 二：Antennaphysicaldiagram Fill:1.Theantennaparametersaretestedaccordingtothesimula tedenvironment,andtherewillbeperformancedeviationsfordi fferentproducts. 2.Thefunctionoftheantennaissensitive.Pleaseinformusto evaluateifthereisanychangeintheperipheralstructureof themainbody. 三：VSWR（电压驻波比）/ReturnLoss（回波损耗）/SmithChart （史密斯圆图） 4 Telephone:0755-23205219OfficialWebsite:http://www.hxrf-antenna.com/ Address:Floors2-5,WestSideofBuildingC10,Xin'anNo.2IndustrialZone,GuxingCommunity,Xixiang Street,Bao'anDistrict,ShenzhenCity. PassISO9001QualityManagement SystemCertification CertificateNumber：76323Q10139R0S 四：Storageenvironment Workingtemperature :-30to70 º C reservetemperature :-30to70 º C 五： D imensions ① 200±5 ② ③ 44.4±0.3 9.8±0.3 mm 1:1 制图 描图 幅面 单位:比例:材料: 一般加工表面粗糙度表面处理 名称: 零件编号: 批准:审核:射频: 绘制: 设计: 颜色:数量:第页 共页 媒体编号 旧底图总号 底图总号 日期 签名 晏清华 .000 ±0.05 GENERAL TOLERANCE DIMENTION .0 .00 . ±0.15 ±0.10 ±0.20 .0 .00 ANGLES . ±1° ±1° ±2° T HX-FPC25-4510-200B1 Serial No Name Specifications/Color 1RF cableRF1.13/Black 2 base material FPC 3IPEX 1 B1/golden 军 军

Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202508-0154-6 Page: 1 of 69 FCC ID:2BTUS-DA1 TB-RF-074-1.0 RF Test Data for Bluetooth (Conducted Measurements) General Description of EUT Product Name: digital bluetooth amplifier Test Model: DA1 Sample ID: HC-C-202508-0154-01-01 Environmental Conditions Temperature: 25.6°C Relative Humidity: 52.6% Test Voltage: AC 120V/60Hz Test Engineer: Lily zhang Note: For a more detailed features description, please refer to the report TBR-C-202508-0154-6 The report only show the worst case data. Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202508-0154-6 Page: 2 of 69 FCC ID:2BTUS-DA1 TB-RF-074-1.0 Contents 1. Duty Cycle ..................................................................................................................................................................................... 3 2. Dwell Time ..................................................................................................................................................................................... 9 3. Maximum Conducted Output Power .......................................................................................................................................... 15 4. -20dB Bandwidth ......................................................................................................................................................................... 21 5. Occupied Channel Bandwidth .................................................................................................................................................... 27 6. Band Edge ................................................................................................................................................................................... 33 7. Band Edge(Hopping) ................................................................................................................................................................... 40 8. Conducted RF Spurious Emission ............................................................................................................................................. 47 9. Restrict Band ............................................................................................................................................................................... 57 10. Carrier Frequencies Separation ........................................................................................................................................ 64 11. Number of Hopping Channel ............................................................................................................................................. 67 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202508-0154-6 Page: 3 of 69 FCC ID:2BTUS-DA1 TB-RF-074-1.0 1. Duty Cycle Condition Mode Frequency (MHz) Antenna Duty Cycle (%) Correction Factor (dB) 1/T (kHz) NVNT 1-DH5 2402 Ant1 76.91 1.14 0.35 NVNT 1-DH5 2441 Ant1 76.88 1.14 500 NVNT 1-DH5 2480 Ant1 77.44 1.11 0.34 NVNT 2-DH5 2402 Ant1 76.96 1.14 0.35 NVNT 2-DH5 2441 Ant1 76.96 1.14 0.35 NVNT 2-DH5 2480 Ant1 76.93 1.14 0.35 NVNT 3-DH5 2402 Ant1 76.99 1.14 0.35 NVNT 3-DH5 2441 Ant1 77.01 1.13 0.35 NVNT 3-DH5 2480 Ant1 76.93 1.14 0.35 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202508-0154-6 Page: 4 of 69 FCC ID:2BTUS-DA1 TB-RF-074-1.0 Test Graphs Duty Cycle NVNT 1-DH5 2402MHz Ant1 Duty Cycle NVNT 1-DH5 2441MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202508-0154-6 Page: 5 of 69 FCC ID:2BTUS-DA1 TB-RF-074-1.0 Duty Cycle NVNT 1-DH5 2480MHz Ant1 Duty Cycle NVNT 2-DH5 2402MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202508-0154-6 Page: 6 of 69 FCC ID:2BTUS-DA1 TB-RF-074-1.0 Duty Cycle NVNT 2-DH5 2441MHz Ant1 Duty Cycle NVNT 2-DH5 2480MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202508-0154-6 Page: 7 of 69 FCC ID:2BTUS-DA1 TB-RF-074-1.0 Duty Cycle NVNT 3-DH5 2402MHz Ant1 Duty Cycle NVNT 3-DH5 2441MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202508-0154-6 Page: 8 of 69 FCC ID:2BTUS-DA1 TB-RF-074-1.0 Duty Cycle NVNT 3-DH5 2480MHz Ant1 Shenzhen Toby Technology Co., Ltd. Http://www.tobylab.cn Add：1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China. Report No.: TBR-C-202508-0154-6 Page: 9 of 69 FCC ID:2BTUS-DA1 TB-RF-074-1.0 2. Dwell Time Condition Mode Frequency (MHz) Antenna Pulse Time (ms) Total Dwell Time (ms) Period Time (ms) Limit (ms) Verdict NVNT 1-DH1 2441 Ant1 0.382 122.24 31600 400 Pass NVNT 1-DH3 2441 Ant1 1.639 262.24 31600 400 Pass NVNT 1-DH5 2441 Ant1 2.887 307.947 31600 400 Pass NVNT 2-DH1 2441 Ant1 0.385 123.2 31600 400 Pass NVNT 2-DH3 2441 Ant1 1.637 261.92 31600 400 Pass NVNT 2-DH5 2441 Ant1 2.885 307.733 31600 400 Pass NVNT 3-DH1 2441 Ant1 0.385 123.2 31600 400 Pass NVNT 3-DH3 2441 Ant1 1.636 261.76 31600 40…

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Shenzhen Toby Technology Co., Ltd. Report No.: TBR-C-202508-0154-6 Page: 1 of 39 TB-RF-074-1.0 1/F.,Building 6, Rundongsheng Industrial Zone, Longzhu, Xixiang, Bao'an District, Shenzhen, Guangdong, China Tel: +86 75526509301 Fax: +86 75526509195 Radio Test Report FCC ID: 2BTUS-DA1 Report No. : TBR-C-202508-0154-6 Applicant : HuiZhou LL Audio Technology Co.,Ltd Equipment Under Test (EUT) EUT Name : digital bluetooth amplifier Model No. : DA1 Series Model No. : N/A Brand Name : AOAOHT Sample ID : HC-C-202508-0154-01-01&HC-C-202508-0154-02-01 Receipt Date : 2025-09-15 Test Date : 2025-09-15 to 2025-12-24 Issue Date : 2025-12-24 Standards : FCC Part 15 Subpart C 15.247 Test Method : ANSI C63.10: 2020 KDB 558074 D01 15.247 Meas Guidance v05r02 Conclusions : PASS In the configuration tested, the EUT complied with the standards specified above. Test By : Lily zhang Reviewed By : Henry huang Approved By : Ivan Su This report details the results of the testing carried out on one sample. The results contained in this test report do not relate to other samples of the same product. The manufacturer should ensure that all products in series production are in conformity with the product sample detailed in the report. Report No.: TBR-C-202508-0154-6 Page: 2 of 39 TB-RF-074-1.0 Contents CONTENTS ............................................................................................................................................ 2 1. GENERAL INFORMATION ABOUT EUT ............................................................................. 5 1.1 Client Information ................................................................................................................ 5 1.2 General Description of EUT (Equipment Under Test) ................................................... 5 1.3 Block Diagram Showing the Configuration of System Tested ...................................... 7 1.4 Description of Support Units .............................................................................................. 7 1.5 Description of Test Mode ................................................................................................... 8 1.6 Description of Test Software Setting ................................................................................ 9 1.7 Measurement Uncertainty ................................................................................................ 10 1.8 Test Facility......................................................................................................................... 11 2. TEST SUMMARY..................................................................................................................... 12 3. TEST SOFTWARE .................................................................................................................. 12 4. TEST EQUIPMENT AND TEST SITE .................................................................................. 13 5. CONDUCTED EMISSION ...................................................................................................... 14 5.1 Test Standard and Limit ................................................................................................... 14 5.2 Test Setup........................................................................................................................... 14 5.3 Test Procedure .................................................................................................................. 14 5.4 Deviation From Test Standard......................................................................................... 14 5.5 EUT Operating Mode ........................................................................................................ 15 5.6 Test Data............................................................................................................................. 15 6. RADIATED AND CONDUCTED UNWANTED EMISSIONS ............................................ 16 6.1 Test Standard and Limit ................................................................................................... 16 6.2 Test Setup........................................................................................................................... 17 6.3 Test Procedure .................................................................................................................. 18 6.4 Deviation From Test Standard......................................................................................... 19 6.5 EUT Operating Mode ........................................................................................................ 19 6.6 Test Data............................................................................................................................. 19 7. RESTRICTED BANDS AND BAND EDGE REQUIREMENT .......................................... 20 7.1 Test Standard and Limit ................................................................................................... 20 7.2 Test Setup........................................................................................................................... 20 7.3 Test Procedure .................................................................................................................. 21 7.4 Deviation From Test Standard......................................................................................... 21 7.5 EUT Operating Mode ........................................................................................................ 21 7.6 Test Data............................................................................................................................. 21 8. 99% OCCUPIED AND 20DB BANDWIDTH ....................................................................... 22 8.1 Test Standard and Limit ................................................................................................... 22 8.2 Test Setup..............................................................…

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FCC ID:2BTUS-DA1 TB-RF-074-1.0 Appendix V EUT Test Photographs Photo of Setup for Conducted Emission(AC POWER) Photo of Setup for Radiated Emission (30MHz~1GHz) FCC ID:2BTUS-DA1 TB-RF-074-1.0 Photo of Setup for Radiated Emission (Above 1 GHz) Conducted Measurements Test -----END OF REPORT-----