FCC ID: 2A7CT-MA-2500DSP Amplifier

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

-Reorient or relocate the receiving antenna.

-Increase the separation between the equipment and receiver.

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

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

FCC ID:2A7CT-MA-2500DSP This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Sa

Martin - Roland International - Corp. 6/12/2022 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern:

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

Clients name / title : Libby Fang Johnston/ PM Contact information / address: 365N.BERRY ST, BREA, CA 92821, USA

Martin - Roland International - Corp. 6/12/2022 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Amplifier / MP-BT # AND FCC ID:

2A7CT-MA-2500DSP To Whom It May Concern:

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

- Block Diagram

- Schematics

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

Clients name / title : Libby Fang Johnston/ PM Contact information / address: 365N.BERRY ST, BREA, CA 92821, USA

Martin - Roland International - Corp. Model Difference Model : MA-3000HD, MR-600, BN-302, Pure-Sound 88 DSP, MA-5000, MA-6000, MHDR518B, MHDR650B, MHDR670B, MR-500, MR-700, MR-800, MR-

900, MA-7000, MA-8000, PWB-20, U-3300, KA-2815, BT-3210, BT-3208E, BT-9925, KA-5800, KA-6800, KA-3817, BN-302, BN-304, BN-308, BN-310, BN-312, BN-920, BN-6200, BN-6400, BN-6600, D05, D06, D03, D12, D13, D16, D15, D18, D33, D34, D35, D36, D37, D38, D39, D40, D45, D46, D47, D48, D49, D50, PA-807, AP-705D, PA-51D, PA-52, PA-63, PA-64, PA-215S, PA-220, PA-230, PA-550, PA-650, PA-118, D23, D260, D339, PA-120, PA-210, BN-6, PMX-60, PMX-80, PMX-1200, PMX-605, PMX-805, PMX-1205, BN-

3016, BN-165, BN-265, X7, PCV-2030, BN-450, K-308, K-210, K-213, SW-12, SW-999, SW-9912, SW-9915, SW-112, SW-115, S112, S115, TB-8, TB-12, TB-15, TH-8, TH-10, TH-12, TH-15, TH-18, BM-12, BM-15, T-12, TF-8, TF-12, TF-15, TJ-12, TJ-15 All the models are the same circuit and RF module, except the mode names. Regards Sincerely, Clients signature Clients signature:

Clients name / title : Libby Fang Johnston/ PM Contact information / address: 365N.BERRY ST, BREA, CA 92821, USA