2BDOJ-COMBINE4HDRIn-Ear Monitor Transmitter Combiner

~ 50/60Hz, 3A TS DC Power Out 15V, 6A Max AC Power 100-240VAC ANT OUT IC: 31654-COMBINE4HDR FCC ID: 2BODJ-COMBINE4HDR COMBINE4 HDR 4 3 21 RF INPU Fuse: T3,15A/250V +- +- ~ 50/60Hz, 3A TS DC Power Out 15V, 6A Max AC Power 100-240VAC ANT OUT IC: 31654-COMBINE8HDR FCC ID: 2BODJ-COMBINE8HDR COMBINE8 HDR 4 3 21 RF INPU 8 7 65 Fuse: T3,15A/250V A B C A B C DD 4 4 3 3 2 2 1 1 ~ 50/60Hz, 3A TS DC Power Out 15V, 6A Max AC Power 100-240VAC ANT OUT IC: 31654-COMBINE4HDR FCC ID: 2BODJ-COMBINE4HDR COMBINE4 HDR 4 3 21 RF INPU Fuse: T3,15A/250V +- +- ~ 50/60Hz, 3A TS DC Power Out 15V, 6A Max AC Power 100-240VAC ANT OUT IC: 31654-COMBINE8HDR FCC ID: 2BODJ-COMBINE8HDR COMBINE8 HDR 4 3 21 RF INPU 8 7 65 Fuse: T3,15A/250V A B C A B C DD 4 4 3 3 2 2 1 1

MRT Technology (Shenzhen) Co., Ltd. Report No.: R26S1035052-U401 Phone: +86-755-26928918 Report Version: V01 Web: www.mrt-cert.com Issue Date: 2026-07-09 Template Version: 3.0 1 of 10 RF Exposure Evaluation Declaration FCC ID: 2BDOJ-COMBINE4HDR Applicant: RF Venue, Inc. Product: In-Ear Monitor Transmitter Combiner Model No.: Combine4 HDR Brand Name: RFVENUE FCC Rule Part(s): FCC Part 2.1091 Result: Complies Evaluation Date: 2026-06-30 Prepared By: Aurora Ding Reviewed By: Jame Yuan Approved By: Robin Wu The test results relate only to the samples tested. This equipment has been shown to be capable of compliance with the applicable technical standards as indicated in the measurement report. Testing was performed in accordance with the applicable measurement procedures. The test results reported herein apply only to the specific item(s) tested. The test report shall not be reproduced except in full without the written approval of MRT Technology (Shenzhen) Co., Ltd. Report No.: R26S1035052-U401 2 of 10 Revision History Report No. Version Description Issue Date Note R26S1035052-U401 V01 Initial Report 2026-07-09 Valid Report No.: R26S1035052-U401 3 of 10 CONTENTS Description Page 1. General Information ............................................................................................................................... 4 1.1. Applicant ........................................................................................................................................4 1.2. Manufacturer .................................................................................................................................4 1.3. Testing Facility ...............................................................................................................................4 1.4. Product Information .......................................................................................................................5 1.5. Antenna Details .............................................................................................................................5 1.6. Device Classification .....................................................................................................................5 1.7. Applied Standards .........................................................................................................................5 2. RF Exposure Evaluation ........................................................................................................................ 6 2.1. Limits .............................................................................................................................................6 2.2. MPE Exemptions ...........................................................................................................................7 2.3. Calculated Result ....................................................................................................................... 10 Report No.: R26S1035052-U401 4 of 10 1. General Information 1.1. Applicant RF Venue, Inc. 24 Walpole Park South, Unit 1, Walpole, Massachusetts, 02081 USA 1.2. Manufacturer RF Venue, Inc. 24 Walpole Park South, Unit 1, Walpole, Massachusetts, 02081 USA 1.3. Testing Facility Test Site - MRT Suzhou Laboratory Laboratory Location (Suzhou - Wuzhong) D8 Building, No.2 Tian’edang Rd., Wuzhong Economic Development Zone, Suzhou, China Laboratory Location (Suzhou - SIP) 4b Building, Liando U Valley, No.200 Xingpu Rd., Shengpu Town, Suzhou Industrial Park, China Laboratory Location (Suzhou - Wujiang) Building 1, No.1 Xingdong Road, Wujiang, Suzhou, Jiangsu, People’s Republic of China Laboratory Accreditations A2LA: 3628.01 CNAS: L10551 FCC: CN1166 ISED: CN0001 Test Site - MRT Shenzhen Laboratory Laboratory Location (Shenzhen) 1G, Building A, Junxiangda Building, Zhongshanyuan Road West, Nanshan District, Shenzhen, China Laboratory Accreditations A2LA: 3628.02 FCC: CN1284 ISED: CN0105 Report No.: R26S1035052-U401 5 of 10 1.4. Product Information Product Name In-Ear Monitor Transmitter Combiner Model No. Combine4 HDR Radio Specification Transmitter Combiner Operating Temperature -20 ~ 50 °C Antenna Information Refer to section 1.5 Power Type 120～240 V AC Note: The information of the EUT (Equipment Under Test) was provided by the manufacturer. The accuracy, completeness, and validity of the information are solely the responsibility of the manufacturer. 1.5. Antenna Details Frequency Range (MHz) Antenna Type Max Declared Peak Gain (dBi) 470 ~ 608 Dipole 0.0 Note: The product is sold without an antenna. 1.6. Device Classification According to the user manual, this device is classified as a Mobile Device. So, the RF exposure evaluation requirements of § 2.1091 for mobile device exposure conditions subject to MPE limits. 1.7. Applied Standards According to the specifications of the manufacturer, the EUT must comply with the requirements of the following standards: ⚫ FCC Part 2.1091 ⚫ KDB 447498 D04 Interim General RF Exposure Guidance v01 Report No.: R26S1035052-U401 6 of 10 2. RF Exposure Evaluation 2.1. Limits According to FCC §1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in §1.1307(b) Limits For Maximum Permissible Exposure (MPE) Frequency Range (MHz) Electric Field Strength (V/m) Magnetic Field Strength (A/m) Power Density (mW/cm 2 ) Average Time (Minutes) (A) Limits for Occupational/ Control Exposures 0.3 ~ 3.0 614 1.63 *(100) ≤6 3.0 ~ 30 1842/f 4.89/f *(900/f 2 ) <6 30 ~ 300 61.4 0.163 1.0 <6 300 ~ 1500 -- -- f/300 <6 1500 ~ 100000 -- -- 5 <6 (B) Limits for General Population/ Uncontrolled Exposures 0.3 ~ 1.34 614 1.63 *(100) <30 1.34 ~ 30 824/f 2.19/f *(180/f 2 ) <30 30 ~ 300 27.5 0.073 0.2 <30 300 ~ 1500 -- -- f/1500 <30 1500 ~ 100000 -- -- 1.0 <30 f= frequency in MHz. * = Plane-wave equivalent power density. Report No.: R26S1035052-U401 7 of 10 2.2. MPE …

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MRT Technology (Shenzhen) Co., Ltd. Report No.: R26S1035052-U201 Phone: +86-755-26928918 Report Version: V01 Web: www.mrt-cert.com Issue Date: 2026-07-09 Template Version: 3.0 1 of 49 RF MEASUREMENT REPORT FCC ID: 2BDOJ-COMBINE4HDR Applicant: RF Venue, Inc. Product: In-Ear Monitor Transmitter Combiner Model No.: Combine4 HDR Brand Name: RFVENUE FCC Classification: Part 15 Wireless Microphone (DWM) FCC Rule Part(s): Part 15 Subpart C (Section 15.236) Result: Complies Received Date: 2026-05-20 Test Date: 2026-06-16 ~ 2026-06-24 Prepared By: Aurora Ding Reviewed By: Jame Yuan Approved By: Robin Wu The test results relate only to the samples tested. This equipment has been shown to be capable of compliance with the applicable technical standards as indicated in the measurement report. Testing was performed in accordance with the applicable measurement procedures. The test results reported herein apply only to the specific item(s) tested. The test report shall not be reproduced except in full without the written approval of MRT Technology (Shenzhen) Co., Ltd. Report No.: R26S1035052-U201 2 of 49 Revision History Report No. Version Description Issue Date Note R26S1035052-U201 V01 Initial Report 2026-07-09 Valid Report No.: R26S1035052-U201 3 of 49 CONTENTS Description Page 1. General Information ................................................................................................................................ 5 1.1. Applicant ...................................................................................................................................... 5 1.2. Manufacturer ................................................................................................................................ 5 1.3. Testing Facility ............................................................................................................................. 5 1.4. Product Information ...................................................................................................................... 6 1.5. Radio Specification under Test .................................................................................................... 6 1.6. Working Frequencies ................................................................................................................... 6 1.7. Input Signal .................................................................................................................................. 6 2. Test Configuration .................................................................................................................................. 7 2.1. Test Mode .................................................................................................................................... 7 2.2. Test Software ............................................................................................................................... 7 2.3. Applied Standards ........................................................................................................................ 7 2.4. Test Environment Condition ......................................................................................................... 7 3. Measuring Instrument ............................................................................................................................ 8 4. Decision Rules and Measurement Uncertainty .................................................................................... 9 4.1. Decision Rules ............................................................................................................................. 9 4.2. Measurement Uncertainty ............................................................................................................ 9 5. Test Result ............................................................................................................................................. 10 5.1. Summary .................................................................................................................................... 10 5.2. 99% Occupied Bandwidth Measurement .................................................................................... 11 5.2.1. Test Limit ..................................................................................................................................... 11 5.2.2. Test Procedure ............................................................................................................................ 11 5.2.3. Test Setting ................................................................................................................................. 11 5.2.4. Test Setup ................................................................................................................................... 11 5.2.5. Test Result .................................................................................................................................. 11 5.3. Frequency Tolerance Measurement .......................................................................................... 12 5.3.1. Test Limit .................................................................................................................................... 12 5.3.2. Test Procedure ........................................................................................................................... 12 5.3.3. Test Setting ................................................................................................................................ 12 5.3.4. Test Setup .................................................................................................................................. 13 5.3.5. Test Result ................................................................................................................................. 13 5.4. Emission Mask Measurement ..............................................................................................…

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Report No.: R26S1035052-U201 36 of 49 Transmitter unwanted emissions in the spurious domain - 607.800 MHz 30 ~ 1000 MHz Note 605.800 ~ 607.000 MHz 607.000 ~ 607.300 MHz 608.300 ~ 608.600 MHz 608.600 ~ 609.800 MHz 1000 ~ 7000 MHz Note: Mark 1 is fundamental frequency that is not evaluated in this item. Report No.: R26S1035052-U201 37 of 49 Test Site NS-TR2 Test Engineer Jeff Yang Test Date 2026-06-16 ~ 2026-06-17 Test Mode Mode 2 Test Frequency (MHz) Frequency Range (MHz) Max Reading Frequency (MHz) Max Reading Level (dBm) Limit (dBm) Result 470.200 30 ~ 1000 479.11 -64.83 -54 Pass 468.200 ~ 469.400 469.3868 -73.21 -36 Pass 469.400 ~ 469.700 469.6553 -79.58 -36 Pass 470.700 ~ 471.000 470.7663 -79.87 -54 Pass 471.000 ~ 472.200 471.1092 -73.80 -54 Pass 1000 ~ 7000 3172.0 -53.87 -30 Pass 539.000 30 ~ 1000 472.32 -64.65 -54 Pass 537.000 ~ 538.200 538.1076 -74.84 -54 Pass 538.200 ~ 538.500 538.4985 -80.61 -54 Pass 539.500 ~ 539.800 539.5099 -80.45 -54 Pass 539.800 ~ 541.000 539.8012 -74.54 -54 Pass 1000 ~ 7000 3181.0 -53.88 -30 Pass 607.800 30 ~ 1000 608.12 -62.38 -54 Pass 605.800 ~ 607.000 606.9100 -73.91 -54 Pass 607.000 ~ 607.300 607.2391 -79.27 -54 Pass 608.300 ~ 608.600 608.3681 -79.82 -54 Pass 608.600 ~ 609.800 608.6240 -73.99 -54 Pass 1000 ~ 7000 3172.0 -53.86 -30 Pass Report No.: R26S1035052-U201 38 of 49 Transmitter unwanted emissions in the spurious domain - 470.200 MHz 30 ~ 1000 MHz Note 468.200 ~ 469.400 MHz 469.400 ~ 469.700 MHz 470.700 ~ 471.000 MHz 471.000 ~ 472.200 MHz 1000 ~ 7000 MHz Note: Mark 1 is fundamental frequency that is not evaluated in this item. Report No.: R26S1035052-U201 39 of 49 Transmitter unwanted emissions in the spurious domain - 539.000 MHz 30 ~ 1000 MHz Note 537.000 ~ 538.200 MHz 538.200 ~ 538.500 MHz 539.500 ~ 539.800 MHz 539.800 ~ 541.000 MHz 1000 ~ 7000 MHz Note: Mark 1 is fundamental frequency that is not evaluated in this item. Report No.: R26S1035052-U201 40 of 49 Transmitter unwanted emissions in the spurious domain - 607.800 MHz 30 ~ 1000 MHz Note 605.800 ~ 607.000 MHz 607.000 ~ 607.300 MHz 608.300 ~ 608.600 MHz 608.600 ~ 609.800 MHz 1000 ~ 7000 MHz Note: Mark 1 is fundamental frequency that is not evaluated in this item. Report No.: R26S1035052-U201 41 of 49 Test Site NS-TR2 Test Engineer Jeff Yang Test Date 2026-06-24 Test Mode Mode 3 Test Frequency (MHz) Frequency Range (MHz) Max Reading Frequency (MHz) Max Reading Level (dBm) Limit (dBm) Result 538.000 + 539.000 + 540.000 + 541.000 30 ~ 1000 480.08 -61.45 -54 Pass 536.000 ~ 537.200 537.1940 -63.88 -54 Pass 537.200 ~ 537.500 537.4085 -71.68 -54 Pass 541.500 ~ 541.800 541.7982 -70.41 -54 Pass 541.800 ~ 543.000 541.9656 -62.59 -54 Pass 1000 ~ 7000 1618.0 -51.97 -30 Pass Report No.: R26S1035052-U201 42 of 49 Transmitter unwanted emissions in the spurious domain 30 ~ 1000 MHz Note 536.000 ~ 537.200 MHz 537.200 ~ 537.500 MHz 541.500 ~ 541.800 MHz 541.800 ~ 543.000 MHz 1000 ~ 7000 MHz Note: Mark 1 is fundamental frequency that is not evaluated in this item. Report No.: R26S1035052-U201 43 of 49 Radiated by the cabinet and structure of the equipment: Test Site NS-AC1 Test Engineer Ted Chen Test Date 2026-06-17 ~ 2026-06-18 Test Mode Mode 1 Test Channel (MHz) Frequency (MHz) Reading Level (dBm) Substitution Factor (dB) Measure Level (dBm) Limit (dBm) Margin (dB) Detector Polarization 470.200 547.495 -90.832 32.000 -58.832 -54.000 -4.832 Peak Horizontal 587.265 -100.451 32.064 -68.387 -54.000 -14.387 Peak Horizontal 548.465 -90.063 31.480 -58.583 -54.000 -4.583 Peak Vertical 590.660 -94.540 32.956 -61.584 -54.000 -7.584 Peak Vertical 6046.000 -78.227 15.982 -62.245 -30.000 -32.245 Peak Horizontal 6997.000 -78.491 19.969 -58.522 -30.000 -28.522 Peak Horizontal 6034.000 -78.665 16.853 -61.812 -30.000 -31.812 Peak Vertical 6664.000 -77.555 17.830 -59.725 -30.000 -29.725 Peak Vertical 539.000 548.465 -94.216 31.999 -62.217 -54.000 -8.217 Peak Horizontal 584.840 -101.259 32.067 -69.192 -54.000 -15.192 Peak Horizontal 548.465 -89.007 31.480 -57.527 -54.000 -3.527 Peak Vertical 596.965 -95.792 32.999 -62.793 -54.000 -8.793 Peak Vertical 6034.000 -78.214 16.532 -61.682 -30.000 -31.682 Peak Horizontal 6982.000 -79.643 19.919 -59.724 -30.000 -29.724 Peak Horizontal 5479.000 -78.370 14.263 -64.107 -30.000 -34.107 Peak Vertical 6904.000 -79.172 19.424 -59.748 -30.000 -29.748 Peak Vertical 607.800 545.555 -93.243 32.017 -61.226 -54.000 -7.226 Peak Horizontal 584.840 -102.330 32.067 -70.263 -54.000 -16.263 Peak Horizontal 548.950 -88.876 31.491 -57.385 -54.000 -3.385 Peak Vertical 597.450 -95.997 32.988 -63.009 -54.000 -9.009 Peak Vertical 5128.000 -78.512 14.478 -64.034 -30.000 -34.034 Peak Horizontal 6937.000 -77.876 19.391 -58.485 -30.000 -28.485 Peak Horizontal 6031.000 -78.835 16.895 -61.940 -30.000 -31.940 Peak Vertical 6961.000 -79.031 19.770 -59.261 -30.000 -29.261 Peak Vertical Note 1: Measure Level (dBm) = Reading Level (dBm) + Substitution Factor (dB) Note 2: Substitution Factor (dB) = Cable Loss (dB) + Space Attenuation (dB) - Antenna Gain (dBi) - 2.15 (dB) Note 3: QP measurement was not performed when peak measure level was lower than the QP limit. RMS measurement was not performed when peak measure level was lower than the RMS limit. Report No.: R26S1035052-U201 44 of 49 Test Site NS-AC1 Test Engineer Ted Chen Test Date 2026-06-17 ~ 2026-06-18 Test Mode Mode 2 Test Channel (MHz) Frequency (MHz) Reading Level (dBm) Substitution Factor (dB) Measure Level (dBm) Limit (dBm) Margin (dB) Detector Polarization 470.200 547.980 -92.365 31.998 -60.367 -54.000 -6.367 Peak Horizontal 783.205 -101.900 34.704 -67.196 -54.000 -13.196 Peak Horizontal 547.980 -88.894 31.477 -57.417 -54.000 -3.417 Peak Vertical 594.055 -95.461 33.026 -62.435 -54.000 -8.435 Peak Vertical 4609.000 -79.441 13.132 -66.309 -30.000 -36.309 Peak Horizontal 6958.000 -79.324 19.727 -59.597 -30.000 -29.597 Peak Horizontal 5140.000 -79.137 14.335 -64.802 -30.000 -34.802 Peak Vertical 6709.000 -79.403 18.355 -61.048 -30.000 -31.048 Peak Vertical 539.…

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