Speakers

Part Number	Description / PDF	Quantity
RVA-90020-N25 Knowles	SPEAKER 117.8OHM 94.3DB	0
CI-32139-000 Knowles	SPEAKER 47 OHM TOP PORT 131.5DB	185
RVA-90020-N24 Knowles	SPEAKER 117.8OHM 94.3DB	0
ED-21914-000 Knowles	SPEAKER 2.9 KOHM SIDE PORT 104DB	0
TEC-30033-000 Knowles	SPEAKER 31OHM SIDE PORT 119DB	0
CI-28434-000 Knowles	SPEAKER 100OHM SIDE PORT 128DB	0
RVA-90063-N20 Knowles	SPEAKER 96.3OHM 99.1DB	0
SR-31843-000 Knowles	SPEAKER 46OHM TOP PORT 105DB RND	0
FED-27288-I06 Knowles	SPEAKER 100OHM SIDE PORT 102.5DB	0
RVA-90120-N08 Knowles	SPEAKER	0
CI-26890-000 Knowles	SPEAKER 68OHM SIDE PORT 128DB	0
RVA-90020-N27 Knowles	SPEAKER 117.8OHM 94.3DB	0
WBFK-30095-000 Knowles	SPEAKER 14.5OHM SIDE PORT 91DB	366
CI-28487-000 Knowles	SPEAKER 100OHM SIDE PORT 128DB	0
SWFK-31736-000 Knowles	TWEETER 7OHM SIDE PORT 97DB RECT	85
GV-32830-000 Knowles	SPEAKER 28.125OHM TOP PORT	70
WBFK-30019-000 Knowles	SPEAKER 15.2OHM SIDE PORT RECT	89
EH-23030-000 Knowles	SPEAKER 1.055 KOHM SIDE PORT	0
HODVTEC-31618-000 Knowles	SPEAKER 25OHM SIDE PORT 122DB	59
DFK-30806-000 Knowles	SPEAKER 55OHM SIDE PORT 101DB	0

Speakers

1. Overview

Speakers are electroacoustic transducers that convert electrical audio signals into sound waves. As critical components in audio systems, they reproduce audible frequencies (typically 20Hz-20kHz) with controlled directivity and fidelity. Modern speaker technology integrates materials science, electromagnetism, and digital signal processing to deliver immersive audio experiences across consumer, professional, and industrial applications.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Dynamic Speakers	Electromagnetic driver with cone diaphragm, wide frequency response	Home theaters, PA systems
Electrostatic Speakers	Thin membrane with electrostatic field, excellent transient response	High-end audiophile systems
Planar Magnetic	Flat diaphragm with printed circuits, precise sound imaging	Studio monitoring, headphones
Coaxial Speakers	Multiple drivers on single axis, improved phase coherence	Car audio systems
Subwoofers	Specialized for low-frequency reproduction (20-200Hz)	Cinema sound systems

3. Structure and Components

Typical speaker systems consist of:

Transducer Elements: Voice coil, magnet assembly, diaphragm
Cabinet: Made from MDF, aluminum, or composite materials
Crossover Network: Passive/active filters directing frequencies to drivers
Connectors: Binding posts, TRS/XLR inputs, or wireless modules
Damping Materials: Acoustic foam for resonance control

4. Key Technical Specifications

Parameter	Description	Significance
Frequency Response	20Hz-20kHz 3dB	Defines audible range accuracy
Sensitivity	85-100 dB/W/m	Efficiency in sound production
Impedance	4 , 6 , 8 nominal	Matching with amplifiers
Power Handling	20-1000W RMS	Maximum safe operating level
THD	<0.5% at 1W	Audio signal purity

5. Application Areas

Consumer Electronics: Smart speakers (Amazon Echo), soundbars
Professional Audio: Studio monitors (Yamaha HS8), live sound systems
Automotive: Door speakers, active noise cancellation systems
Commercial: Distributed audio in retail spaces, emergency PA systems
Immersive Systems: Dolby Atmos home cinema setups

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Innovation
Bose	901 Direct/Reflecting Series	Omni-directional sound field
KEF	LS50 Wireless	Uni-Q concentric driver
Bowers & Wilkins	800 Series Diamond	Matrix internal bracing
Yamaha	HS8 Studio Monitor	Neutral sound reproduction
Harman Kardon	Invoke	Cortana integration

7. Selection Recommendations

Key selection criteria:

Match impedance/power handling with amplifier specifications
Room size vs. speaker sensitivity (e.g., 88dB+ for large spaces)
Crossover frequency alignment in multi-way systems
Material durability for environmental conditions (humidity, temperature)
Budget allocation: 30-50% of total audio system cost recommended

8. Industry Trends Analysis

Emerging developments include:

Integration of AI-powered room calibration (Dirac Live, Audyssey)
Multi-directional transducers for 3D audio in VR/AR applications
Development of micro-speakers using graphene diaphragms
Adoption of wireless mesh networks (WiSA technology) for speaker arrays
Growth of automotive audio systems with headrest-integrated transducers