Y4O-TZS118 inch DSP-EQUIPPED POWERED SUBWOOFER

inMusic Brands Inc. Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 09-05-2026 Ref: Attestation Statements Part 2.911(d)(7) Filing FCC ID or Grantee Code: [Y4O -TZS1] (“inMusic Brands Inc.”) certifies that, as of the date of the filing of the application, we designate ourselves as the U.S. agent for service of process. Designated U.S. Agent Information: FRN: 0022102461 Name: inMusic Brands Inc. Address: 200 SCENIC VIEW DRIVE, SUITE 201.CUMBERLAND. Rhode Island, United States,02864 Contact Person: Hill Lien Tel.: +866-2-2717-2389 Email: [email protected] Sincerely, [Insert applicant name] [Applicant printed name] Hill Lien

inMusic Brands Inc. 2.911 (d)(5)(i) Equipment Type Attestation v1.2 Section 2.911(d)(5)(i) Certification – Equipment Type Company name: inMusic Brands Inc. Address: 200 Scenic View Drive, Cumberland, RI 02864 U.S.A Product Name: 18 inch DSP-EQUIPPED POWERED SUBWOOFER FCC ID: Y4O-TZS1 Model(s): TZS1 2.911(d)(5)(i) Equipment Type We, [inMusic Brands Inc.] (“the applicant”) certify that the equipment for which authorization is sought through certification is not: • Prohibited from receiving an equipment authorization pursuant to § 2.903; of the FCC rules. • Identified as an equipment type in the “Covered List” NOTE 1 Yours sincerely, Name: Date: Sept. 05,2026 NOTE 1 “Covered List ”; is the List of Equipment and Services Covered By Section 2 of The Secure Networks Act, available at https://www.fcc.gov/supplychain/coveredlist References; 1) 986446 D01 Covered Equipment v01 https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=325672 2) Federal Register document 2022-28263 published on 02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-national-security-threats-to-the-com munications-supply-chain-through-the

inMusic Brands Inc. 2.911 (d)(5)(ii) Applicant Attestation v1.3 Section 2.911(d)(5)(ii) Certification – Applicant (Covered List ) Company name: inMusic Brands Inc. Address: 200 Scenic View Drive, Cumberland, RI 02864 U.S.A Product Name: 18 inch DSP-EQUIPPED POWERED SUBWOOFER FCC ID: Y4O-TZS1 Model(s): TZS1 2.911(d)(5)(ii) Applicant filing We, [Insert applicant name] (“the applicant”) certify that, as of the date of the filing of the application, the applicant is not identified NOTE 1 on the “Covered List” NOTE 2 , established pursuant to § 1.50002 of this chapter, as an entity producing covered communications equipment. Yours sincerely, Name: Date: Sept. 05,2026 NOTE 1 Delete option not applicable to this application. NOTE 2 “Covered List ”; is the List of Equipment and Services Covered By Section 2 of The Secure Networks Act, available at https://www.fcc.gov/supplychain/coveredlist References; 1) 986446 D01 Covered Equipment v01 https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=325672 2) Federal Register document 2022-28263 published on 02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-national-security-threats-to-the-com munications-supply-chain-through-the

inMusic Brands Inc. Letter of Authorization Company: inMusic Brands Inc. Address: 200 Scenic View Drive, Cumberland, RI 02864 U.S.A Product Name: 18 inch DSP-EQUIPPED POWERED SUBWOOFER Model Number(s): TZS1 Product Description: 18 inch DSP-EQUIPPED POWERED SUBWOOFER We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature: Date: Sept. 05,2026 Name: Hill Lien Title: Director of Compliance Company: inMusic Brands Inc.

inMusic Brands Inc. Power of Attorney / Authorization to Act as Agent To Whom It May Concern: We, the undersigned, inMusic Brands Inc. hereby authorize Judy Xu at Sushi TOWE Wireless Testing (Shenzhen) Co., Ltd. on our behalf, in all matters relating to all processes related to FCC equipment authorization including the signing of documents in connection with this application. Any and all acts carried out by Sushi TOWE Wireless Testing (Shenzhen) Co., Ltd. on our behalf shall have the same effect as acts of our own. Thank you for your attention to this matter. If you have any questions regarding this authorization, please don/t hesitate to contact us. Sincerely yours. Signature: Contact Person: Hill Lien Title: Director of Compliance Phone: 886 227172389 Ext.77 E-Mail: [email protected] Date: Sept. 05,2026

inMusic Brands Inc. Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Date: Sep 05.2026 To Whom It May Concern: I, the undersigned, hereby states 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, and will apply the Supplier's Declaration of Conformity procedure to the class B computer peripheral portion of this composite device. I understand the following FCC requirements: 1. Devices subject to the SDoC procedure are required to be tested to show compliance with the FCC technical regulations by a recognized accredited testing laboratory. The testing laboratory must be accredited by a Commission approved accreditation body or designated under the terms of a government-to-government Mutual Recognition Agreement (MRA). A listing of those accredited testing laboratories that have been recognized by the Commission is published on the FCC Webpage: https://apps.fcc.gov/oetcf/eas/reports/TestFirmSearch.cfm (Select the "accredited" option to search for FCC recognized accredited test firms.) 2. Pt 2.1077 contains the list of information that must be included in the Supplier's Declaration of Conformity, which must be supplied with each product sold. The SDoC compliance info shall be included in the User’s Manual or as a separate sheet. The info must contain the name, address, and phone number of the responsible party, which must be located within the United States. According to 2.909(b), the responsible party is either the Manufacturer or if the product is imported the Importer. Regards, signature Contact Person: Hill Lien Applicant: inMusic Brands Inc.

inMusic Brands Inc. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: Sep 5.2026 Subject; Request for Confidentiality FCC ID: Y4O-TZS1 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Hill Lien

Product DevelopmentArtwork Release product name / description revision print date description code Alto Professional TZS1 John Boudreau 12.22.2025 REV D Silkscreen created changes from last revision Andrew Wang TZS1 RevA: NEW ARTWORK RevB: REVISED “INPUT1” “INPUT2” AND “CLIP” TEXT POSITIONS TO CLEAR COMBO JACK LATCH, ADJUSTED DESCRIPTOR FONT SIZE TO MATCH TZ01 TZ02 FONT, UPDATED “CAN-ICES(B)/NMB(B)” COMPLIANCE INFO, RevC: UPDATED REAR DIELINE LAYER WITH HOMNI DXF FILE “TZS1_silkscreen dieline_V1.0_20251211”, RevD: UPDATED DIELINE TO REFLECT HOMNI 12/22/2025 CAD, UPDATED INPUT & THRU SILKSCREEN, Reference/Info -- DO NOT PRINT PART COLOR: Mechanical Dieline/Drawing - DO NOT PRINT Pure White checked Artwork 1:1 scale Design Development Artwork Approval

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Sushi TOWE Wireless Testing (Shenzhen) Co., Ltd. Report No.: TSEA26070070302 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. TEST REPORT Applicant: inMusic Brands Inc. EUT Description: 18 inch DSP-EQUIPPED POWERED SUBWOOFER Model Tested: TZS1 Model Covered: TZS1, TZ18S, TZ************ (* can be "0-9", "a-z", "A-Z," blank, "-", "+" or any character, symbol, alphanumeric) Brand: Alto Professional FCC ID: Y4O-TZS1 Standards: CFR 47, FCC Part 2.1091 447498 D01 General RF Exposure Guidance v06 Date of Receipt: 2026/08/06 Date of Issue: 2026/08/27 TOWE tested the above equipment in accordance with the requirements set forth in the above standards. The test results show that the equipment tested is capable of demonstrating compliance with the requirements as documented in this report. The results documented in this report apply only to the tested sample, under the conditions and modes of operation as described herein. It is the manufacturer's responsibility to assure that additional production units of the model are manufactured with identical electrical and mechanical components. All samples tested were in good operating condition throughout the entire test program. Measurement Uncertainties are published for informational purposes only and were not taken into account unless noted otherwise. Without written approval of TOWE, the test report shall not be reproduced except in full. Jim Huang Approved By: Carey Chen Reviewed By: Page 2 / 8 Report No.: TSEA26070070302 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. Revision History Rev. Issue Date Description Revised by 01 2026/08/27 Original Carey Chen Page 3 / 8 Report No.: TSEA26070070302 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. Table of Contents 1 General Description ............................................................................................................................4 1.1 Lab Information .....................................................................................................................4 1.1.1 Testing Location ..............................................................................................................4 1.1.2 Test Facility / Accreditations ............................................................................................4 1.2 Client Information .................................................................................................................4 1.2.1 Applicant ..........................................................................................................................4 1.2.2 Manufacturer ....................................................................................................................4 1.3 Product Information ..............................................................................................................5 2 Maximum Permissible RF Exposure .................................................................................................6 2.1 RF Exposure Limit Introduction ..........................................................................................6 2.2 Equations ..............................................................................................................................7 3 RF Exposure Results ..........................................................................................................................8 3.1 Standalone Exposure Calculations .....................................................................................8 Page 4 / 8 Report No.: TSEA26070070302 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. 1 General Description 1.1 Lab Information 1.1.1 Testing Location These measurement tests were conducted at the Sushi TOWE Wireless Testing (Shenzhen) Co., Ltd. facility located at F 401 and F 101, Building E, Hongwei Industrial Zone,No. 6, Liuxian 3rd Road, Zone 70, Xingdong Community, Xin'an Street, Bao'an District, Shenzhen, People's Republic of China. The measurement facility is compliant with the test site requirements specified in ANSI C63.4-2014 Tel.: +86-755-27212361 Contact Email: [email protected] 1.1.2 Test Facility / Accreditations A2LA (Certificate Number: 7088.01) This laboratory is accredited in accordance with the recognized International Standard ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories. This accreditation demonstrates technical competence for a defined scope and the operation of a laboratory quality management system (refer to joint ISO-ILAC-IAF Communiqué dated April 2017). FCC Designation No.: CN1353 Sushi TOWE Wireless Testing (Shenzhen) Co., Ltd. has been recognized as an accredited testing laboratory. Test Firm Registration Number: 684095 Desi…

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SuzhouSaixunCommunicationsTechnologyCo.,Ltd. _____________________________________________________________________________________________________________________ *SuZhouSaixunCommunicationTechnologyCo.,Ltd. *Add：NO.629,YunliRoad,WuJiangDistrict,SuZhouCity,JiangSuProvince,China *TEL：0512-63636028 *E-Mail:[email protected] *Web：www.szsaixun.com 1 Specification CUSTOMER:DongguanHongyiElectronicsCo.,Ltd. PARTNAME:2.4GHzPCBAntenna PARTNO:SX-006-1401/60100053- Company Approval （ SIGNAFUR ） engineering （ CHECKEDBY ） QA （ TESTED ） ApprovalDate （ DATE ） YanhuTUOCherryHU2026/06/22 Customer Approval (CUSTOMERA PPROVAL) engineering （CHECKEDBY） QA （TESTED） ApprovalDate （ DATE ） SuzhouSaixunCommunicationsTechnologyCo.,Ltd. _____________________________________________________________________________________________________________________ *SuZhouSaixunCommunicationTechnologyCo.,Ltd. *Add：NO.629,YunliRoad,WuJiangDistrict,SuZhouCity,JiangSuProvince,China *TEL：0512-63636028 *E-Mail:[email protected] *Web：www.szsaixun.com 2 Catalogue 1.Cover---------------------------------------------------------------------------------------Page1 2.TableofContents-------------------------------------------------------------------------Page2 3.ProductIllustration-----------------------------------------------------------------------Page3 4.ProductPerformanceSpecificationsTable--------------------------------------------Page4 (1)RFparameters (2)MechanicalParameters (3)Environmentalparameters 5.TestReport----------------------------------------------------------------------------Pages5 – 6 SuzhouSaixunCommunicationsTechnologyCo.,Ltd. _____________________________________________________________________________________________________________________ *SuZhouSaixunCommunicationTechnologyCo.,Ltd. *Add：NO.629,YunliRoad,WuJiangDistrict,SuZhouCity,JiangSuProvince,China *TEL：0512-63636028 *E-Mail:[email protected] *Web：www.szsaixun.com 3 3.Productdrawing SuzhouSaixunCommunicationsTechnologyCo.,Ltd. _____________________________________________________________________________________________________________________ *SuZhouSaixunCommunicationTechnologyCo.,Ltd. *Add：NO.629,YunliRoad,WuJiangDistrict,SuZhouCity,JiangSuProvince,China *TEL：0512-63636028 *E-Mail:[email protected] *Web：www.szsaixun.com 4 4.Performanceparameter RFparameters Frequencyrange2400-2500MHz Impedance50ohm Standingwaveratio2.0max PolarizationmodeHorizontal/Vertical Gain2.0dBi+/-0.5dBi Directionalityomnidirectional MechanicalProperties AntennaHousingnothave ConnectorI-PEX(DomesticallyProduced) Feederspecifications1.13mmcoaxialcable Outlinedimension10*60mm ConnectionMethodI-PEXboardend OperatemodeN/A AntennaoscillatorPCB EnvironmentProperties Workingtemperature -40°C～85°C Storagetemperature -30°C～60°C SuzhouSaixunCommunicationsTechnologyCo.,Ltd. _____________________________________________________________________________________________________________________ *SuZhouSaixunCommunicationTechnologyCo.,Ltd. *Add：NO.629,YunliRoad,WuJiangDistrict,SuZhouCity,JiangSuProvince,China *TEL：0512-63636028 *E-Mail:[email protected] *Web：www.szsaixun.com 5 5.Testreport 5.12Dpatterns X-YPlane 240024502500 X-ZPlane 240024502500 Y-ZPlane 240024502500 SuzhouSaixunCommunicationsTechnologyCo.,Ltd. _____________________________________________________________________________________________________________________ *SuZhouSaixunCommunicationTechnologyCo.,Ltd. *Add：NO.629,YunliRoad,WuJiangDistrict,SuZhouCity,JiangSuProvince,China *TEL：0512-63636028 *E-Mail:[email protected] *Web：www.szsaixun.com 6 5.2ReturnLoss 5.33DPeakGain&Efficiency FrequencyEfficiency(%) peak Gain(dBi) 2400MHz 77.452.22 2410MHz 78.562.25 2420MHz 79.942.31 2430MHz 79.612.24 2440MHz 79.812.22 2450MHz 78.582.11 2460MHz 77.241.95 2470MHz 73.431.68 2480MHz 71.641.68 2490MHz 73.531.58 2500MHz 75.091.60 --------------------------------------------------------------------END----------------------------------------------------------------------------------

Sushi TOWE Wireless Testing (Shenzhen) Co., Ltd. Report No.: TSEA26070070301 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. TEST REPORT Applicant: inMusic Brands Inc. EUT Description: 18 inch DSP-EQUIPPED POWERED SUBWOOFER Model Tested: TZS1 Model Covered: TZS1, TZ18S, TZ************ (* can be "0-9", "a-z", "A-Z," blank, "-", "+" or any character, symbol, alphanumeric) Brand: Alto Professional FCC ID: Y4O-TZS1 Standards: CFR 47, FCC Part 15 Subpart C Date of Receipt: 2026/08/06 Date of Test: 2026/08/06 to 2026/08/27 Date of Issue: 2026/08/27 TOWE tested the above equipment in accordance with the requirements set forth in the above standards. The test results show that the equipment tested is capable of demonstrating compliance with the requirements as documented in this report. The results documented in this report apply only to the tested sample, under the conditions and modes of operation as described herein. It is the manufacturer's responsibility to assure that additional production units of the model are manufactured with identical electrical and mechanical components. All samples tested were in good operating condition throughout the entire test program. Measurement Uncertainties are published for informational purposes only and were not taken into account unless noted otherwise. Without written approval of TOWE, the test report shall not be reproduced except in full. Jim Huang Approved By: Carey Chen Reviewed By: Page 2 / 51 Report No.: TSEA26070070301 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. Revision History Rev. Issue Date Description Revised by 01 2026/08/27 Original Carey Chen Page 3 / 51 Report No.: TSEA26070070301 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. Summary of Test Results Clause FCC Part Test Items Result 4.1 §15.203/15.247(b) Antenna Requirement PASS 4.2 §15.207 AC Power Line Conducted Emission PASS 4.3 §15.247 (b)(3) Output Power PASS 4.4 §15.247 (a)(2) Occupied Bandwidth Reporting purposes only 4.5 §15.247 (e) Power Spectral Density PASS 4.6 §15.247(d) Band Edge for Conducted Emissions PASS 4.7 §15.247(d) Spurious RF Conducted Emissions PASS 4.8 §15.205 §15.209 Radiated Spurious emissions and Band Edge PASS Test Method: ANSI C63.10-2020+Cor. 1-2023+C63.10a-2024 + Errata to C63.10a-2024, KDB 558074 D01 15.247 Meas Guidance v05r02. Remark: Pass is EUT meets standard requirements. Page 4 / 51 Report No.: TSEA26070070301 Sushi TOWE Wireless Testing(Shenzhen) Co., Ltd. Email: [email protected] Tel.: +86-755-27212361 TOWE-QP-15-F05 Rev.1.1 All rights reserved. Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from TOWE. Table of Contents 1 General Description .............................................................................................................................. 5 1.1 Lab Information ...................................................................................................................... 5 1.1.1 Testing Location ................................................................................................................ 5 1.1.2 Test Facility / Accreditations ............................................................................................. 5 1.2 Client Information ................................................................................................................... 5 1.2.1 Applicant ............................................................................................................................ 5 1.2.2 Manufacturer ..................................................................................................................... 5 1.3 Product Information ............................................................................................................... 6 2 Test Configuration ................................................................................................................................ 7 2.1 Test Channel ........................................................................................................................... 7 2.2 Worst-case configuration and Mode .................................................................................... 8 2.3 Support Unit used in test ....................................................................................................... 8 2.4 Test Environment ................................................................................................................... 8 2.5 Test RF Cable .......................................................................................................................... 8 2.6 Modifications .......................................................................................................................... 8 2.7 Test Setup Diagram ................................................................................................................ 9 2.7.1 Conducted Configurati…

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