The Harman Kardon brand ranks among premium audio manufacturers. It is known for its emphasis on precise craftsmanship, elegant design and above all top-quality sound. In both car audio and home audio, it offers products that excel in a clean, detailed and balanced presentation with an emphasis on faithful music reproduction. Harman Kardon is part of the Harman group, which ensures the use of advanced technologies and long-standing know-how in acoustics. Products from this brand are often included in premium cars and demanding installations where emphasis is placed on the highest listening quality, luxurious finish and reliable performance without compromise.
Speakers Harman/Kardon FLOW300S
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Harman/Kardon FLOW300S
Harman Kardon FLOW 300S are 3" midrange speakers designed for more demanding car installations where accuracy, clarity and natural midrange reproduction are important. This model is an ideal choice for systems in which each driver has a clearly defined role and the result should be a balanced, detailed and musical sound. Thanks to their compact dimensions, the FLOW 300S are suitable even for installations with limited space, yet they can deliver a surprisingly full and energetic performance. A notable strength is their ability to reproduce vocals, instruments and speech with high intelligibility and natural tonality.
The speaker is rated at 60 W RMS with a maximum power of 180 W, so it can easily handle everyday use as well as more demanding listening at higher volumes. A frequency range of 200 Hz to 10 kHz makes it an ideal solution for midrange reproduction, where a substantial part of the musical content resides. The high sensitivity of 91 dB also helps to make efficient use of power and ensures dynamic, readable sound even in well-matched systems. The FLOW 300S therefore represents an excellent choice for anyone looking to improve overall sound quality and give their system greater precision and space.
The Harman Kardon FLOW 300S also impress with quality craftsmanship and accessories that make installation easier. The package includes a pair of 3" midrange speakers, protective grilles, screws, speed clips, EVA gaskets and a user manual, so installation is more convenient and you have everything you need at hand. If you're building a quality three-way system or want to take your car audio project to the next level, the FLOW 300S is exactly the type of speaker that will help create a clean, precise and mature sound performance.
Main features
- 3" midrange driver for high-quality midrange reproduction.
- 60 W RMS power and 180 W max.
- Frequency range 200 Hz – 10 kHz.
- 91 dB sensitivity for efficient and dynamic reproduction.
- Impedance 4 ohms.
- Suitable for premium car audio installations.
- Compact dimensions that facilitate installation even in smaller spaces.
- Clean, detailed and natural reproduction of vocals and the midrange.
- Package includes 2 speakers, grilles, screws, speed clips, EVA gaskets and manual.
About the brand
| Catalog number | HK FLOW300S |
| Brand | Harman Kardon |
| Links | Official web presentation |
| Speaker typeCoaxial speakers: Coaxial speakers are characterized by a so-called all-in-one design. The tweeter and mid-bass speaker are in one basket. The advantage is simpler assembly, but thanks to the connection or proximity of the bands in one speaker, the sound quality will usually be reduced. As a rule, in the middle of the mid-bass speaker, there is a tweeter whose voice coil works in the second air gap of the common magnetic circuit. The three-way coaxial speaker consists of a mid-bass speaker, a center speaker and a separate tweeter in the front on a special beam. Component Speakers: Component speakers are characterized by a division into individual frequency bands, treble + mid-bass + or. bass band. The individual speakers can be placed completely separately, which results in a better sound and acoustic performance. In the vast majority of cases of component speakers, an external crossover is also supplied, which divides the treble, middle / mid-bass, and into the three-band the bass band or allows setting the decibel level of the tweeter (e.g. +2 dB, 0 dB, -2 dB), steepness (e.g. 6dB/Oct. 12dB/Oct.) or active or bi-amp connection. | Midrange |
| RMS powerRMS speaker power is the constant power of the entire system, not just one speaker or one side. This is also the performance of continuous use of the speakers. If the RMS power is exceeded for a long time, the speakers may be irreversibly damaged! | 60 W |
| Max. (maximum performancePeak performance , which the speaker can play for a moment (approx. 0.5 s), for example when hitting drums in a song. If the max power is exceeded, the speakers will usually be damaged! | 180 W |
| Sensitivity (SPL 2.83V/1m)Sensitivity, sensitivity or efficiency of the speaker. Speaker sensitivity is given in decibels (dB) and simply put, the higher the value, the lower the demands on the amplifier's power. This is a defacto rating of how a speaker converts watts to sound. Sensitivity ratings are in noise level measured at 1 meter from the speaker using 1 W (watt of power) or using 2.83 volts at the source at 1 meter. A higher decibel level means the speaker is louder with less power. For every 3 dB increase in sensitivity, the speaker requires half the power to reproduce the same volume. For example, if an 88 dB speaker needs 100 Watts to produce a certain volume, then a speaker with a sensitivity of 91 dB needs only 50 Watts to reach the same volume. | 91 dB |
| ImpedanceImpedance - measurement of electrical resistance. When buying speakers, it is important to make sure that the impedance matches the amplifier or car stereo you are using. Example: A 2 Ohm speaker cannot be connected to an amplifier that is only stable up to 4 Ohms! A 4 Ohm speaker can easily be used with an amplifier that is stable up to 2 Ohms. The most common speaker impedance today is 3 - 4 Ohm. | 4 Ω |
| Frequency rangeThe ability of the speakers to play a signal from the lowest frequency to the highest, or the speaker's ability to faithfully reproduce sound in a specific frequency band. Professionally: In the frequency range from 40 to 16,000 Hz, the vast majority of fundamental and overtones (harmonics) of all musical instruments are found. We are interested in the course of the radiated sound pressure in this range of frequencies when the loudspeaker system is supplied with constant power. We call this course the frequency characteristic, which tells us the level of radiated sound pressure in decibels (dB) depending on the frequency. The frequency characteristic of a speaker or speaker system can be expressed most succinctly with a graph. Mostly, however, the frequency characteristic is indicated by indicating the maximum tolerance of the sound pressure in the given frequency range, e.g. 50 to 15,000 Hz -+ 6 dB. Since the frequency characteristics of loudspeakers and systems in general are quite uneven, some manufacturers do not even specify this maximum tolerance of sound pressure in decibels in their catalogs for reasons of prestige. Data impoverished in this way is unfortunately worthless. What is valid is that the manufacturer offers a speaker system with a frequency range of 30 to 20,000 Hz, if he is worried about stating the maximum unevenness of the sound pressure in this range, because he can have a tolerance of, for example, +- 20 dB. The unevenness or undulation of the frequency curve in good speaker systems for high-quality music performance should not exceed +-3 dB in the 80 to 12,000 Hz band and +-6 dB in the 40 to 16,000 Hz band. Greater unevenness already depletes or emphasizes certain tonal areas, which can cause audible or even disturbing distortion. The proportion between fundamental tones and higher harmonics also changes, thereby changing the color of the sound, and individual musical instruments as well as the entire musical image sound unnatural. | 200 - 10,000 Hz |
| Center speaker diameterThe diameter of the center speaker is given as the diameter of a round speaker, not including the mount, where the mounts protrude even more on smaller speakers. | 89 mm |
| Frequency crossover included in the packageThe crossover is an important part of defacto all loudspeakers. A crossover usually contains different resistor values, coil sizes, and capacitor types that fundamentally modify the sound. We describe below what the turnouts are for. Component Speakers: A crossover is part of every quality component speaker system. Its task is to ensure the distribution of frequencies that the amplifier produces in the entire acoustic spectrum of frequencies so that each of the speakers receives only that part of the band that it can optimally play in terms of efficiency and minimal distortion. Coaxial speakers: In most cases, coaxial loudspeakers have a simple crossover (6dB/Oct.) formed by a capacitor at the tweeter. | No |
| Cover grids included in the packageOriginal cover grilles in speaker packaging. | No |
| Price forIf the price is for a pair, the package always includes 2 pieces of everything, e.g. 2x mid-bass, 2x tweeter and 2x crossover. | Pair |



