PIBB19PREMIUM HOME MUSIC SYSTEM

Audioengine LLC U.S. Agent Designation for Service of Process - Certification Attestation Letter Audioengine LLC 304 Progress Drive, Sherman, Texas 75092, United States Federal Communication Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA 2025-12-09 Attestation Statement according to 2.911(d)(7) FCC ID: PIBB19 TO WHOM IT MAY CONCERN: We, Audioengine LLC designate ourselves to act as U.S. agent for service of process. Audioengine LLC hereby acknowledges the obligation of the U.S. agent for service of process. Further Audioengine LLC accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Sincerely Applicant Signed/ Designated Agent Signed: Signature: Company name: Audioengine LLC FRN: 0021991005 Address: 304 Progress Drive, Sherman, Texas 75092, United States Contact Person: Mike Ye Telephone No: (805)407-8548 Email: [email protected]

Audioengine LLC Covered Equipment Certification Attestation Letter 2025-09-10 Nemko North America, Inc. 303 River Road Ottawa K1V 1H2 Canada ATTN.: Reviewing Engineer FCC ID:PIBB19 Audioengine LLC (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Note: If the equipment for which the applicant seeks authorization is produced by any of the entities identified on the current Covered List , the applicant should include an explanation on why the equipment is not “covered” equipment. Audioengine LLC (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Audioengine LLC (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01Covered Equipment Guidance section B(2a). Signed: Printed name: Mike Ye Title: Vice President Company Name: Audioengine LLC Address: 304 Progress Drive, Sherman, Texas 75092, United States Phone: (805)407-8548 E-Mail: [email protected] Date: 2025-09-10

AudioengineLLC 2025-09-10 NemkoNorthAmerica,Inc. 303RiverRoad Ottawa,Ontario,Canada K1V1H2 AUTHORITYTOACTASAGENT-FCC Onourbehalf,IappointDamonHu,GuangdongDongdianTestingServiceCo.,Ltd.(Unit2,Building 1,No.17,Zongbu2ndRoad,SongshanLakePark,Dongguan,Guangdong,China,523808),toact asouragentinthepreparationofthisapplicationforequipmentcertification.Icertifythatsubmitted documentsproperlydescribethedeviceorsystemforwhichequipmentcertificationissought.Ialso certifythateachunitmanufactured,importedormarketed,asdefinedinFCCregulationswillhave affixedtoitalabelidenticaltothatsubmittedforapprovalwiththisapplication. Insigningthisletter,Applicantcertifiesthatneithertheapplicantnoranypartytotheapplicationis notsubjecttoadenialofFederalbenefits,thatincludeFCCbenefits,pursuanttoSection5301ofthe Anti-DrugAbuseActof1988,21U.S.C.§862becauseofaconvictionforpossessionordistribution ofacontrolledsubstance.See47CFR1.2002(b)forthedefinitionofa"party"forthesepurposes. Forinstanceswhereourauthorizedagentsignstheapplicationforcertificationonourbehalf,I acknowledgethatallresponsibilityforcomplyingwiththetermsandconditionsforcertification,as specifiedbyNemkoNorthAmericaInc.,stillresidesstillresideswithus. Sincerely, Printedname:MikeYe Title:VicePresident CompanyName:AudioengineLLC Address:304ProgressDrive,Sherman,Texas75092,UnitedStates Phone:(805)407-8548 E-Mail:[email protected] Date:2025-09-10

Audioengine LLC 2025-09-10 Nemko North America, Inc. 303 River Road Ottawa, Ontario, Canada K1V 1H2 REQUEST FOR CONFIDENTIALITY – FCC FCC ID: PIBB19 Pursuant to Sections 0.457(d) and 0.459 of the Commission’s Rules andFCC Guidance document 726920, we hereby request permanent confidential treatment of exhibits identified as such in the table below and request they are permanently withheld from public review based on the documents containing trade secrets and proprietary information not customarily released to the public. The public disclosure of this information might be harmful to the applicant and provide unjustified benefits to its competitors. We also request short-term confidentiality on certain exhibits until the intended date of marketing as outlined below. We request the exhibits be withheld from public view for a period of180 days. We attest marketing of the product will only commence after the period of short-term confidentiality expires, or if marketing is to commence beforethe requested number of days listed above, the grantee will inform Nemko to release the Short-Term Confidentiality information withheld on the FCC equipment authorization website. ExhibitType of Confidentiality Requested Block Diagrams ☒Permanent ☐Short Term External Photos------------------ ☒Short Term Internal Photos☐Permanent*☒Short Term Operation Description ☒Permanent ☐Short Term Parts List & Placement/BOM ☐Permanent☐Short Term Tune-Up Procedure☐Permanent ☐Short Term Schematic Diagrams ☒Permanent ☐Short Term Test Setup Photos------------------ ☒Short Term User’s Manual ☐Permanent* ☒Short Term The asterisked items (*) require further information to be provided in this justification letter before permanent confidentiality will be extended to these exhibits. Please refer to FCC KDB 726920 D01 found at: https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=41731and review section II, 3) regarding specific information that must accompany these requests. Note:any documents held under the Short-Term confidentiality will automatically become public after the requested time if an appropriate extension request has not been received. Any exhibits (i.e., schematic diagrams) that may have already been requested to have “Permanent” confidentiality as shown above need not be repeated under Short-Term confidentiality request. Sincerely, Signed : Printed name: Mike Ye Title: Vice President Company Name: Audioengine LLC Address: 304 Progress Drive, Sherman, Texas 75092, United States Phone: (805)407-8548 E-Mail: [email protected] AudioengineLLC Date:2025-09-10

L R L Input Out to Right Volume Pair 100-240V ~50/60Hz 1.5A USB Input Designed by Audioengine in Texas Assembled in China Model: A2+ Gen3 FCC ID: PIBB19 CAN ICES-3 (B)/NMB-3(B) IC: 31364-AUDENGA2GEN3 A2-G3 rear panel silkscreen - V06 Oct 10, 2025 Paint color: black Ink color: Pantone 427C R-R- AuL- A2Gen3 N13461 Kopek Japan R 218-250702 In from Left R Scan for product info audioengine.com Scan for product info, setup or support 42mm 12mm A2+BT18092000001B 46mm 13mm Designed by Audioengine in Texas Assembled in China Model: A2+ Gen3 label location: the back of product

Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E05 TRF No.: RT-4-E-006Page 1 of 7 RF EXPOSURE REPORT Applicant : Audioengine LLC Address of Applicant : 304 Progress Drive, Sherman, TX 75092 United States Manufacturer : DongGuan Evervictory Electronic Co.,Ltd Address of Manufacturer : Chu-chi District, Hu-Men Town, DongGuan City, GuangDong Province, China Equipment under Test : PREMIUM HOME MUSIC SYSTEM Model No. : A2+GEN3 FCC ID : PIBB19 Test Standard(s) : KDB447498 D01 General RF Exposure Guidance v06 Report No. : DDT-RE25061726-2E05 Issue Date : 2025/11/26 Issue By : Guangdong Dongdian Testing Service Co., Ltd. Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808 Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E05 TRF No.: RT-4-E-006Page 2 of 7 Table of Contents 1.General Test Information..............................................................................................5 1.1.Description of EUT .......................................................................................................5 1.2.Accessories of EUT......................................................................................................5 1.3.Test laboratory .............................................................................................................5 2.RF Exposure evaluation for FCC .................................................................................6 2.1.Assessment procedure.................................................................................................6 2.2.Assess result ................................................................................................................7 Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E05 TRF:RT-4-E-006Page 3 of 7 $!CeMetaLims!digital$ Test Report Declare Applicant : Audioengine LLC Address of Applicant : 304 Progress Drive, Sherman, TX 75092 United States Equipment under Test : PREMIUM HOME MUSIC SYSTEM Model No. : A2+GEN3 Manufacturer : DongGuan Evervictory Electronic Co.,Ltd Address of Manufacturer : Chu-chi District, Hu-Men Town, DongGuan City, GuangDong Province, China Test Standard Used: KDB447498 D01 General RF Exposure Guidance v06 We Declare: The equipment described above is tested by Guangdong Dongdian Testing Service Co., Ltd. and in the configuration tested the equipment complied with the standards specified above. The test results are contained in this test report and Guangdong Dongdian Testing Service Co., Ltd. is assumed of full responsibility for the accuracy and completeness of these tests. Report No.:DDT-RE25061726-2E05 Date of Receipt:2025/08/04Date of Test:2025/08/04~2025/10/31 Note: This report applies to above tested sample only. This report shall not be reproduced in parts without written approval of Guangdong Dongdian Testing Service Co., Ltd. Created: Jacky HuangReviewed: Johnson HuangApproved: Ella Gong 2025/10/312025/11/252025/11/26 Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E05 TRF:RT-4-E-006Page 4 of 7 Revision History VersionRevision ContentIssue DateApproved V0Initial issue2025/11/26Ella Gong Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E05 TRF:RT-4-E-006Page 5 of 7 1. General Test Information 1.1. Description of EUT EUT Name:PREMIUM HOME MUSIC SYSTEM Model Number:A2+GEN3 EUT Function Description:Please reference user manual of this device Power Supply:AC 100-240V, 50/60Hz Radio Specification:Bluetooth BR/EDR Operation Frequency:2402 MHz to 2480 MHz Modulation: GFSK, π/4-DQPSK, 8DPSK Antenna Type:FPC antenna Max Antenna Gain (dBi):3.54 Note: The above EUT information is declared by manufacturer and for more detailed features description please refer to the manufacturer's specifications or User's Manual. 1.2. Accessories of EUT AccessoriesManufacturerModel numberDescription //// 1.3. Test laboratory Guangdong Dongdian Testing Service Co., Ltd. Add.: Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808. Tel.: +86-0769-38826678, http://www.dgddt.com, Email: [email protected]. CNAS Accreditation No. L6451; A2LA Accreditation Number: 3870.01 FCC Designation Number: CN1182, Test Firm Registration Number: 540522 Innovation, Science and Economic Development Canada Site Registration Number: 10288A Conformity Assessment Body identifier: CN0048 VCCI facility registration number: C-20087, T-20088, R-20123, R-20240, G-20118 Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E05 TRF:RT-4-E-006Page 6 of 7 2. RF Exposure evaluation for FCC 2.1. Assessment procedure Requirement: Systems operating under the provisions of FCC 47 CFR section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091 this device has been defined as mobile device whereby a distance of 0.2 m normally can be maintained between the user and the device, and below RF Permissible Exposure limit shall comply with. Limits for General Population/Uncontrolled Exposure Frequency Range （MHz） Electric Field Strength (E) (V/m) Magnetic Field Strength (H) （A/m） Power Density (S) （mW/cm 2 ） Averaging Time |E| 2 ,|H| 2 or S (minutes) 0.3-1.346141.63(100)*30 1.34-30824/f2.19/f(180/f)*30 30-30027.50.0730.230 300-1500 F/150030 1500-100000 1.030 Note: f= frequency in MHz; *Plane-wave equivalent power density Calculation method From the peak EUT RF output power, the minimum mobile separation distance, d=0.2 m, as well as the gain of the used antenna, the RF power density can be obtained. Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E05 TRF:RT-4-E-006Page 7 of 7 2.2. Assess result Mode Output power (dBm) Tune up power (dBm) Tune up power (mW) Antenna Gain (dBi) Antenna Gain (linear) MPE Values (mW/cm 2 ) MPE Limi…

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深圳市亿圣邦科技有限公司第 1 页 深圳市亿圣邦科技有限公司 样品承认书 SPECIFICATIONFORAPPROVAL 公司名称（客户填写）：深圳铂声科技有限公司 物料代码（客户填写）： 规格型号（客户填写）： 承认日期（客户填写）： 供应商名称（SLK填写）：深圳市亿圣邦科技有限公司 供应商规格型号（SLK填写）：WIFI:SLK-BS-P3212A-R-200I-B-1.13 承认签章 供应商承认（SLK填写栏）深圳铂声科技有限公司 工程师审核批准工程师审核批准 刘才亮黄震林美财 盖章签署盖章签署 日期2025-8-5日期 批示：□接受□有条件接受 备注（客户填写）： 供应商名称:深圳市亿圣邦科技有限公司 供应商地址:深圳市宝安区深圳前湾硬科技产业园C栋101 电话：18025305599电话：18666299104 深圳市亿圣邦科技有限公司第 2 页 WIFIAntenna(P3212A) 1.ExplanationofProductnumber: SLK-BS-P3212A-R-200I-B-1.13 12345 ProductCode: (1)Customer: BS:铂声科技 (2)Project: P3212A:SLK-BS-P3212A(WIFIantenna) (3)WeldingPosition R:Right (4)CableLength: 200I:200*1.13MM一代端子 (5)CableColor B:Black 2.Features *Stableandreliableinperformances *Compactsize *RoHScompliance 3.Applications *IEEE802.11(b/g/n/a) *Hand-helddeviceswhenWIFI(802.11b/g/n/a)functionsareneeded 深圳市亿圣邦科技有限公司第 3 页 4.Description Holybond’sFPCantennaseriesarespeciallydesignedforWIFI(802.11 b/g/n/a)applications.BasedonHolybond’sproprietarydesignandprocesses, thisFPCantennahasexcellentstabilityandsensitivitytoconsistentlyprovide highsignalreceptionefficiency. 5.ElectricalSpecifications 5-1 CharacteristicsSpecificationsUnit OutlineDimensions 32.29x12.68x0.6 mm CenterFrequency 2.4-2.5/5.15-5.85GHz Bandwidth(under-10dBreturnloss) 130minMHz VSWR 3max 5-2 ． VSWRS11 深圳市亿圣邦科技有限公司第 4 页 5-3.WIFI+BTAntennaGain/Efficiency/RadiationPatternof3D Frequency(MHz)Efficiency(dBi)Gain(dBi)Efficiency(%) 2400.0-3.583.3043.84 2410.0-3.443.5445.33 2420.0-3.503.2744.70 2430.0-3.313.4746.63 2440.0-3.573.0743.98 2450.0-3.572.9843.98 2460.0-3.433.1945.39 2470.0-3.613.1043.60 2480.0-3.512.8744.59 2490.0-3.672.7342.93 2500.0-3.792.4241.75 5150.0-3.943.4240.37 5350.0-3.812.9741.58 5550.0-3.783.0141.90 5750.0-3.462.9045.03 5850.0-3.283.4146.98 深圳市亿圣邦科技有限公司第 5 页 6.AntennaDimensions(unit:mm) 深圳市亿圣邦科技有限公司第 6 页 7.AntennaPicture

Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E02 TRF: RT-4-E-005Page 1 of 101 RADIO TEST REPORT Applicant : Audioengine LLC Address of Applicant : 304 Progress Drive, Sherman, TX 75092 United States Manufacturer : DongGuan Evervictory Electronic Co.,Ltd Address of Manufacturer : Chu-chi District, Hu-Men Town, DongGuan City, GuangDong Province, China Equipment under Test : PREMIUM HOME MUSIC SYSTEM Model No. : A2+GEN3 FCC ID : PIBB19 IC : 31364-AUDENA2GEN3 Test Standard(s) : FCC Rules and Regulations Part 15 Subpart C, ANSI C63.10:2020, RSS-247 Issue 4 July 24, 2025, RSS-Gen Issue 5, Apr. 2018, Amendment 2 (February 2021) ANSI C63.10-2020+Cor.1-2023+C63.10a-2024+ Errata to C63.10a-2024 Report No. : DDT-RE25061726-2E02 Issue Date : 2025/12/01 Issue By : Guangdong Dongdian Testing Service Co., Ltd. Unit 2, Building 1, No. 17, Zongbu 2nd Road, Songshan Lake Park, Dongguan, Guangdong, China, 523808 Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E02 TRF: RT-4-E-005Page 2 of 101 Table of Contents 1.Summary of Test Results .............................................................................................7 2.General Test Information..............................................................................................8 2.1.Description of EUT .......................................................................................................8 2.2.Accessories of EUT......................................................................................................9 2.3.Block diagram of EUT configuration for test.................................................................9 2.4.Decision of final test mode ...........................................................................................9 2.5.Deviations of test standard.........................................................................................10 2.6.Test environment conditions ......................................................................................10 2.7.Test laboratory ...........................................................................................................11 2.8.Measurement uncertainty...........................................................................................11 3.Equipment Used During Conductive Test ..................................................................12 4.20 dB Bandwidth ........................................................................................................13 4.1.Block diagram of test setup ........................................................................................13 4.2.Limits ..........................................................................................................................13 4.3.Test procedure ...........................................................................................................13 4.4.Test result...................................................................................................................14 4.5.Test graphs ................................................................................................................15 5.99% Bandwidth ..........................................................................................................18 5.1.Block diagram of test setup ........................................................................................18 5.2.Limits ..........................................................................................................................18 5.3.Test procedure ...........................................................................................................18 5.4.Test result...................................................................................................................19 5.5.Test graphs ................................................................................................................20 6.Maximum Peak Output Power....................................................................................23 6.1.Block diagram of test setup ........................................................................................23 6.2.Limits ..........................................................................................................................23 6.3.Test procedure ...........................................................................................................23 6.4.Test result...................................................................................................................24 6.5.Test graphs ................................................................................................................25 7.Carrier Frequency Separation ....................................................................................28 7.1.Block diagram of test setup ........................................................................................28 7.2.Limits ..........................................................................................................................28 7.3.Test procedure ...........................................................................................................28 7.4.Test result...................................................................................................................29 7.5.Test graphs ................................................................................................................30 8.Dwell Time..................................................................................................................31 Guangdong Dongdian Testing Service Co., Ltd. Report No.: DDT-RE25061726-2E02 TRF: RT-4-E-005Page 3 of 101 8.1.Block diagram of test setup ........................................................................................31 8.2.Limits ..........................................................................................................................31 8.3.Test procedur…

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