Product Overview
The MRS1115H025R6T 15mm Portable Internal Speaker is a compact mobile phone speaker designed for smartphones, portable electronics, communication devices, audio modules, handheld terminals, and other space-limited products that require clear sound output in a small enclosure.
With an 11×15×2.5t dimension, 6±20%Ω rated impedance, 1W rated input power, and 93±3dB SPL performance in a 1cc box, this internal speaker provides a practical acoustic solution for compact consumer electronics and OEM mobile device applications.
The speaker is designed for stable sound reproduction, low weight, and easy integration into miniature acoustic structures. It is suitable for applications where compact size, reliable voice output, and consistent electrical-acoustic performance are required.
Key Features
Compact 11×15×2.5t size supports mobile phone, portable device, and embedded audio product designs.
1W rated input power and 1.2W maximum input power support clear audio output in compact speaker cavities.
6±20%Ω rated impedance is suitable for common small audio amplifier circuits used in portable electronics.
93±3dB SPL at 2KHz in a 1cc box provides strong sound output for compact internal speaker applications.
f0Hz to 20KHz frequency range supports voice, notification sound, and general portable audio output.
Lightweight 1.5g design helps reduce total product weight and supports slim device assembly.
Technical Specifications
| Parameter | Specification |
| Model | MRS1115H025R6T |
| Dimension | 11×15×2.5t |
| Rated Input Power | 1W in 1cc box |
| Max Input Power | 1.2W in 1cc box |
| Rated Impedance | 6±20%Ω / 2.0KHz / 2.45Vrms |
| Coil Resistance | 5±20%Ω |
| Resonance Frequency (f0) | 650±20%Hz in free air at 1.0Vrms/10cm; 950±20%Hz while testing in 1cc box at 2.45Vrms/10cm |
| Sound Pressure Level | 93±3dB SPL / 2.45Vrms / 10cm at 2KHz in 1cc box |
| Frequency Range | f0Hz ~ 20KHz |
| Total Harmonic Distortion | ≤10% at 1KHz, 2.45Vrms/10cm in 1cc box |
| Flux Density | 0.4T |
| Polarity | When a positive DC current is applied to the voice coil terminal marked + or red, the diaphragm shall move forward. |
| Operation Test | Must be normal at sine wave and program source 1W in 1cc box. |
| Buzz, Rattle, etc. | Must be free of audible noise, buzzes, and rattles within 200Hz–2KHz frequency range, input level up to 2.45Vrms, while testing in 1cc box. |
| Weight | 1.5g |
| Appearance | Should not have obstacles harmful to normal operation, damages, cracks, rusts, distortions, or similar defects. |
| Storage Temperature | -40℃ to +85℃ |
| Operation Temperature | -20℃ to +70℃ |
Applications
This 15mm internal speaker is suitable for mobile phones, smart devices, handheld terminals, portable speakers, communication products, intercom devices, tablets, wearable electronics, medical devices, industrial handheld equipment, and compact consumer electronics.
It can also be used in OEM and ODM audio projects where a small internal speaker with stable SPL, compact thickness, and reliable acoustic performance is required.
Working Principle
The internal speaker converts electrical audio signals into mechanical vibration through the voice coil and magnetic circuit. The vibration drives the diaphragm to move air and produce sound output.
When installed in a proper acoustic cavity, such as a 1cc box, the speaker can deliver controlled sound pressure level, resonance behavior, and frequency response suitable for portable electronic devices.
Design and Integration Notes
For best performance, the speaker should be matched with a suitable audio amplifier, acoustic cavity, sealing structure, and sound outlet design. The 1cc test box data can be used as a reference when designing the final enclosure.
Avoid mechanical stress, dust, foreign objects, and blocked sound outlets during assembly. The diaphragm should not be pressed or deformed, as this may affect SPL, distortion, buzz, rattle, and long-term reliability.
Before mass production, confirm impedance, rated power, SPL target, resonance frequency, cavity volume, terminal polarity, operating temperature, and final acoustic performance in the actual product structure.
Why Choose This 15mm Internal Speaker
The MRS1115H025R6T combines compact 11×15×2.5t dimensions, 1W rated power, 6Ω impedance, 93±3dB SPL, and lightweight 1.5g design. It provides a practical internal speaker solution for mobile phones and compact portable electronics.
Its stable acoustic specifications and defined test conditions make it easier for engineers to evaluate performance, design the enclosure, and integrate the speaker into small electronic devices.
FAQ
What is this 15mm internal speaker used for?
This internal speaker is used for mobile phones, handheld devices, portable electronics, communication products, smart devices, wearable devices, and other compact audio output applications.
How loud is this mobile phone speaker?
The specified sound pressure level is 93±3dB SPL at 2.45Vrms and 10cm, measured at 2KHz in a 1cc box.
What is the rated power of this internal speaker?
The rated input power is 1W in a 1cc box, and the maximum input power is 1.2W in a 1cc box.
How should I design the enclosure for this speaker?
The final enclosure should provide suitable cavity volume, sealing, sound outlet area, and mechanical protection. Since the specification references testing in a 1cc box, acoustic performance should be verified in the final product structure.
What factors affect speaker sound quality?
Sound quality can be affected by amplifier output, enclosure volume, sealing, sound hole design, diaphragm protection, mounting pressure, resonance frequency, distortion, and the final product housing structure.
How do I confirm speaker polarity?
When a positive DC current is applied to the terminal marked + or red, the diaphragm should move forward. Correct polarity helps ensure phase consistency in the final audio design.
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