As a renowned loudspeaker design firm, ZEH Audio specializes in Speaker driver manufacturing. With exceptional quality, it stands as a trusted partner for speaker makers, boasting core advantages as follows:
When selecting a speaker, the outer diameter should not be the only consideration. Available installation space, enclosure volume, amplifier output, impedance, rated power, sensitivity, frequency response, target sound pressure level, and operating environment should all be evaluated.
Even speakers of the same size can deliver noticeably different sound performance due to differences in diaphragm material, voice coil, NdFeB magnet, acoustic enclosure, and sound outlet design.
Small-size speakers are designed for electronic devices with limited installation space. They enable voice prompts, alarm tones, hands-free communication, and music playback within compact product structures.
However, a smaller speaker does not mean acoustic design can be overlooked. Actual volume, sound quality, and low-frequency performance are also influenced by amplifier output, enclosure volume, sealing, sound outlet area, and mounting position. For products requiring stronger bass or higher sound pressure levels, performance should be optimized through the coordinated design of the speaker, amplifier, acoustic enclosure, and overall product structure.
Each type of loudspeaker below can be selected from our existing size platforms or customized to suit your product structure, acoustic enclosure, amplifier specifications, target sound performance, and mass-production requirements. Customizable parameters include speaker size, shape, depth, mounting holes, impedance, rated power, magnet, diaphragm, mounting method, and wire connection. Speaker grilles can also be added upon request.
Based on your product structure and target sound performance, ZEH can recommend or customize small-, medium-, and large-size speakers for your project. We also provide acoustic enclosure design, amplifier matching, PCBA development and debugging, DSP tuning, plastic enclosure manufacturing, sample validation, and mass-production services—helping ensure stable acoustic and mechanical integration between the speaker and the finished product.
ZEHSMAUDIO can adapt an existing speaker platform or develop a modified structure based on your installation space, sound target, electronics, enclosure and production requirements.
We review your housing dimensions and mounting structure before selecting the frame and magnetic circuit.
Round, oval, rectangular and low-profile frames can be adapted to internal ribs, PCB positions and assembly methods.
Speaker parameters are evaluated together with the amplifier, enclosure, listening distance and required sound performance.
Diaphragm, surround and magnet materials are selected according to the target sound, environment and cost requirements.
The project can include the enclosure, grille, wiring, connector, sealing components and amplifier matching.
Small speakers operate within tighter mechanical, acoustic and power constraints than larger drivers. ZEH Audio combines speaker engineering, system integration and scalable manufacturing to help OEM/ODM customers develop compact audio solutions that fit the product, meet the target sound performance and remain consistent in mass production.
Small speaker performance depends on more than driver diameter. Our engineers evaluate mounting depth, frame shape, magnet size, sound outlet position, enclosure volume and available internal space together to develop a speaker that fits your product without compromising the required acoustic performance.
We evaluate the speaker together with the enclosure, amplifier, PCBA, acoustic chamber, sound outlet, sealing structure and wiring. This system-level approach helps achieve clearer voice reproduction, sufficient SPL and more stable sound performance within limited product space and power budgets.
Speaker samples can be evaluated for frequency response, sensitivity, impedance, distortion, mechanical fit and other project-specific requirements before mass production. Controlled materials, production processes and acoustic testing help maintain consistent performance from approved samples to production batches.
With more than 20 years of loudspeaker manufacturing and engineering experience, ZEH can start from an existing speaker platform or develop a customized solution around your product requirements. We support projects from speaker selection and structural modification through sample validation, enclosure integration and volume production.
A small speaker driver measures roughly 13–40 mm (0.5″–1.5″) across its mounting footprint, in round, oval, square or rectangular form. Below 13 mm a part is normally classed as a micro speaker; above 40 mm it enters the medium range. Measure the footprint and the total depth including the magnet, not the cone diameter — depth is what usually decides whether a driver fits.
Size is only part of it. Small speaker drivers (13–40 mm) use a conventional cone and carry music as well as voice prompts. Micro speakers (8–20 mm) use a much shallower motor and a flat diaphragm, trading low-frequency output for thickness, and are chosen when the product is thinner than about 4 mm. Where the ranges overlap at 13–20 mm, available depth decides.
In sourcing terms, yes. “Built-in speaker” and “internal speaker” describe where the part sits — inside the customer’s housing, with no cabinet of its own — while “small speaker driver” describes what the part is. Almost every built-in speaker in consumer and industrial electronics is a 13–40 mm raw driver, supplied bare or pre-assembled with leads, a gasket and a plastic box.
Match the driver to the amplifier, not to a preference. At the same supply voltage a 4 Ω driver draws roughly twice the current and delivers about 3 dB more output, which suits battery products that must be loud from 3.7 V. 8 Ω runs cooler, sits inside a small class-D amplifier’s current limit, and is the safer default when the amplifier is fixed or the product plays continuously.
Usually less than the spec sheet suggests. A 28–40 mm driver rated 1–3 W reaches its mechanical limit well before its thermal limit, so a 5 W amplifier adds distortion rather than volume. Set the rated power from the amplifier’s real output at the battery’s lowest voltage and leave 20–30% headroom. Rated power is a durability figure; sensitivity and excursion decide loudness.
Give a 28 mm driver at least 1–2 cc of sealed back volume and a 40 mm driver 5–10 cc; below that, air stiffness raises the resonance and thins the sound. The cavity must be genuinely sealed — a 0.5 mm gap around a wire exit can cost several dB in the low end. Where volume is unavailable, a vent or passive radiator tuned to the cavity recovers more than a bigger driver would.
In most cases the driver is fine and the assembly is the cause. The usual culprits are an amplifier clipping at low battery voltage, an unsealed or resonating housing panel, leads touching the cone, and a frame deformed by uneven screw or rib pressure. Reproduce the fault with the driver in a test baffle first — if it disappears there, the problem is mechanical, not acoustic.
