Active subwoofer Harmony HB 8 US

Name: Active subwoofer Harmony HB 8 US
Brand: Harmony
Rating: 5.0000 (3 reviews)

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active subwoofer under the seat, 8", 110 W RMS
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Active subwoofer Harmony HB 8 US

Harmony presents the active subwoofer HB 8 US with a 200 mm (8") driver, which combines superior sound in its price category, honest workmanship and a very affordable price. The Harmony HB 8 US with a power of 110 W RMS was designed so that even in in today's era full of competitive products, it offered something more. And that is nothing more than quality sound under the auspices of Italian masters ESB Audio. Modern design and a thickness of only 70 mm ensures trouble-free installation under the seat of most of today's vehicles. Despite its flat design, the subwoofer has high performance and above-standard sound quality. Of course, there are high-level inputs and you can also rely on automatic switching. An ideal solution for everyone who wants to support the bass component of the sound system and not lose practically any space in the car's interior. On the chassis of the subwoofer, you will find a control panel with the possibility to set the input sensitivity, low pass or Bass boost You can connect the subwoofer via RCA and high-level inputs, and the package also includes a remote control for easy power adjustment.

The main features of the active subwoofer Harmony HB 8 US

Active subwoofer under the seat.
8" driver with a power of 110 W RMS.
Compact dimensions with a mounting height of 70 mm.
Connection via RCA and high-level inputs.
Option to set gain, Bass boost and LPF.
A rotary remote control is included in the package.
Durable aluminum body.
Dimensions: 316 x 240 x 70 mm.

About the Harmony brand

The Italian brand Harmony was born in the 80s together with the first home speakers produced by the Italian hi-end manufacturer ESB Audio. Car speaker production began in the 1990s with a wide range of products that combined high sound quality with a significantly lower price point than ESB Audio products. And that was the main mission of the Harmony brand - to provide a high standard of sound quality with faithful reproduction of the entire sound spectrum, superior processing and all this at a more affordable price. The same applies in 2022, when ESB Audio decided to create a new Harmony product line. This includes component and coaxial speakers, a subwoofer, subwoofers under the seat, and amplifiers with a DSP processor at a very affordable price are worth mentioning. More interesting high quality products will follow under the sophisticated control of parent company ESB Audio.

Catalog number	HB 8 US
Brand	Harmony
Links	Official web presentation
RMS power of the subwooferThe RMS power of an active subwoofer is the constant power that the active subwoofer can play over a long period of time. We recommend following this value. The RMS power of active subwoofers is taken as the RMS power of the integrated amplifier, which in most cases is slightly undersized, which guarantees protection against subwoofer burning.	110 W
Maximum subwoofer performancePeak performance or Max. power that an active subwoofer can play for a moment (approx. 0.5 s), for example when percussion instruments are struck in a recording. But it is not as important a parameter as the RMS power.	220 W
Energy class of the amplifierAmplifiers are divided into two basic classes: analog and digital . Analog amplifiers (A/B) have higher consumption requirements, but usually have a more natural sound. Digital amplifiers (D) have significantly lower consumption and higher efficiency, but the sound may not be as faithful as with classic analog amplifiers.	AB
The diameter of the subwoofer usedThe diameter of the subwoofer that is installed in the active box.	8" (200 mm)
Frequency rangeThe ability of the device to reproduce a signal from the lowest frequency to the highest, or the ability of an active subwoofer 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 for reasons of prestige. Data impoverished in this way is 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, i.e. the undulation of the frequency course in good speaker systems for 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.	10 - 150 Hz
Low-pass filter (LPF)	50 - 150 Hz
High level inputThe high-level input on the active subwoofer enables connection directly to the speakers in the car without purchasing an external high/low converter. Use in the case of mounting an active subwoofer on the original car radio.	Ano
Automatic on and offThis function will facilitate your installation and solve the problem of finding a remote signal, which is sometimes a problem with original car radios. The active subwoofer with the Auto sense function can recognize that the equipment in the car is active and turn itself on. A useful and practical feature.	Ano
Bass boost functionBass boost or bass enhancement. With this function, the bass itself can be emphasized, at a high level of bass boost, the speakers and the subwoofer can distort a lot and the sound will be worse than better. We therefore recommend using the "bass boost" function wisely.	Ano
Phase rotation optionPhase shift is a linear electronic oscillator that produces a sinusoidal output. It consists of an inverting part of the amplifier such as a transistor. The feedback network "shifts" the phase at the output of the amplifier by 180 degrees to the oscillation frequency and gives positive feedback. The Phase shift filter produces a phase shift that increases with increasing frequency. This is usually used when the subwoofer sub-assembly is out with the magnet, or when two amplifiers are connected externally. Phase Shift is also used with active speaker wiring, where the time shift of the speakers is set. The point is that the subwoofer does not play the bass late, and for this reason better amplifiers offer this phase reversal option.	Ano
Crossover setting optionsUsually this involves tuning the LPF filter on the active subwoofer.	Ano
Cabling included in the packageSome active subwoofers have complete wiring included in the package. In the event that the package really includes complete wiring for connection, we mark the parameter as "yes". If the wiring is not included, it must be purchased.	Ne
Remote control included in the packageSome models of active subwoofers also have wired remote controls in the package, which on the one hand connect to the active box, and on the other hand you have a potentiometer that you can place anywhere in the cabin. A common place to place the remote control is under the steering wheel. The advantage is the regulation of power, and therefore volume, depending on driving conditions and the mood of the crew in the car.	Ano
Protective gridProtective grids or bars, as protection against mechanical damage to the subwoofer.	Ano
What is the baffle made of?Active subwoofers can be made of MDF board, hardened plastic, sheet metal, aluminum or a combination of different materials.	Hliník
Active subwoofer dimensions	316 x 240 x 70 mm