4 inch speakers

MR45F03 4.5 inch subwoofer


4.5 inch iron frame 90mm magnetic 32mm voice coil rubber edge subwoofer speaker

This is a product that is very worth looking forward to, with small diameter, light weight, high sensitivity, very smooth frequency response curve and very little distortion. AES Power Handing 30W, Frequency Range 61-10.0kHZ, Sensitivity 1W/1M 86dB.

Form of Information

The tone is very sweet, the vocals are full and soft, and the high frequency is delicate. His design is very unique, and every detail is carefully polished and designed by engineers. From the product's shape, structure, to the acoustic principle design, the best design results have been obtained after numerous experimental tests.

General Specifications
Nominal Diameter
Nominal Impedance
AES Power Handing
30W   (AES)
Maximum Power
Sensitivity 1W/1M
Frequency Range
Voice Coil Diameter
32.5mm/1.27 inch
Windinig Material
Former Material
Winding Depth
surround material
surround Design
MagnetΦ90Ferrite Ring
Thiele & Small Parameters
Resonance FrequencyFs61Hz
DC ResistanceRe3.35Ω
Mechanical FactorQms4.65
Electrical FactorQes0.65
Total FactorQts0.57
BL FactorBL5.7T.m
Effective Moving MassMms16.5g
Equivalent Cas Air LoadVas4.45L
Effettive Piston AreaSd86.6cm²
η(Eta Zero)η00.14%
Mountiong & Shipping Information
Overall Diameter
Bolt circle diameter
Baffle Cutout Diameter
Net Weight

This is the size chart of the MR45F03, which can better help you design and install the speaker:

MR45F03 4.5 inch subwoofer

MR45F03 4.5-inchsubwoofer speaker curve graph.

MR45F03 4.5 inch subwoofer

MR45F03 4.5 inch subwoofer

Company Introduction

Founded in 2005, Merry Audio is a professional manufacturer focusing on R&D, manufacturing and sales of high-power speakers for entertainment KTV, bars, conferences and outdoor perfor-mances. We are committed to providing our customers with high-quality speaker units and supporting solutions.

Now it has world-class production technology and equipment such as KLIPPEI, LMS, CLIO, and laser Test elastic wave displacement and drum paper FS instrument, high-power life tester, salt spray testing machine and online full inspection curve and parameter QC version KLEPPEL and other equipment.

  • Guangdong Merry Audio Equipment Co., Ltd.

  • Guangdong Merry Audio Equipment Co., Ltd.

  • Guangdong Merry Audio Equipment Co., Ltd.

  • Guangdong Merry Audio Equipment Co., Ltd.

  • Guangdong Merry Audio Equipment Co., Ltd.

  • Guangdong Merry Audio Equipment Co., Ltd.

  • Guangdong Merry Audio Equipment Co., Ltd.

  • Guangdong Merry Audio Equipment Co., Ltd.


Q1: How can i get a sample?


If you need some samples to test, we can make as per your request.

You should pay for the transportation freight of samples and our samples cost, while the samples cost can be refundable after you place the order. Thanks.

Q2: How much the transportation freight of samples?


The freight depends on the weight and packing size and your area.

Q3: Can you produce according to customers' design?


We mainly do the OEM/ODM service.

Q4: Is it OK to print my logo on the product?


Yes. Please inform us formally before our production and confirm the design firstly based on our sample.

Q5: How to order?


Please send us your purchase order by mail or WhatsApp with below information:

1) Product information: Quantitiy, Model number, Specification.

2) Delivery time required.

3) Shipping information: Company name, Address, Phone number, Destination: seaport/airport.

4) Forwarder's contact details if you have.

Q6: OUR services


1. Any questions from you are welcome and will be replied in 24 working hours.

2. Experienced staff answer all your questions in fluent English.

3. Special discount and protection of sales area provided to our distributor.

4. Specialized in speakers over 17 years.

5. A team of designers and engineers are capable to create new items according to personal request.

6. Customized design is available.

Welcome OEM and ODM


Contact Us

Connect Way


+86 139 2509 0366

1-6-02/03, Zone B, Guangfo Zhao (Huaiji) Economic Cooperation Zone, Zhagang Industrial Park, Huaiji County, Zhaoqing City, Guangdong Province

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