Amplifier with DSP processor Zapco HB 48 II 4A
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Amplifier with DSP processor Zapco HB 48 II 4A
The Zapco HB 48 II 4A is a 4-channel amplifier with an integrated 8-channel DSP processor that combines exceptional sound quality with a compact design and easy installation. It offers a 31-band equalizer for fine acoustic tuning, advanced signal routing, adjustable delay, levels, polarity and crossover types. Thanks to the integrated Bluetooth 5.1 module it enables wireless music streaming and the new mobile app allows full control of the system directly from a smartphone. The built-in music player supports playback from USB devices including lossless formats. The Zapco HB 48 II 4A thus represents a versatile solution for upgrading factory audio systems with maximum control and sonic purity.
Harmony Blue Note Series
The Italian brand Harmony was established in the 1980s alongside the first development of home speakers by the hi-end manufacturer ESB. In the 1990s it focused on car audio and introduced a wide range of products that combined precise sound with more accessible pricing. Zapco now revives the same philosophy under the Harmony Blue Note line – a new series of DSP processors and amplifiers that blend excellent engineering, superior sound quality and easy operation. The name Blue Note refers to the era of jazz recordings between 1930 and 1950, which produced music of extraordinary depth and emotion. With this name Zapco pays tribute to music with soul and carries that philosophy into the modern car-audio world. The Harmony Blue Note series includes not only pure DSP units like the HB 68 II, but also DSPs with amplifiers and standalone high-power amplifiers. All models share Bluetooth streaming, intuitive control, broad connectivity and maximum user-friendliness.
PC control software
Zapco has developed new PC control software that provides a complete set of professional DSP tools. The user interface offers clearly organized sections for equalization, crossovers, routing and time correction. In the I/O Matrix section you can precisely define which inputs are used for each output and in what proportion. The filters allow exact configuration of high-quality crossovers with selectable type and slope for each channel. The 31-band graphic or parametric equalizer enables fine-tuning of the frequency response including adjustments to frequency, gain and Q factor. In the output channels section you can configure speaker assignment, delay, levels and polarity to achieve perfect phase alignment across the system. The program allows saving and loading presets, linking channels and locking configurations, providing a clear environment suitable for both professional installers and advanced users.
Mobile app and built-in player
Every model in the Harmony Blue Note line features an integrated Bluetooth module that enables full control via smartphone. The newly developed app offers all functions known from the PC version – from input and output settings through crossovers and equalization to delay and individual channel levels. The app is designed to bring intuitive control to a smaller display without limiting functionality. Users can tune the system, change presets or signal sources directly from their mobile device, which is ideal for final sound tuning in the car. The system also includes a music player that plays tracks directly from a USB device. All common and lossless formats are supported – MP2, MP3, MP4, WMA, APE, FLAC, AAC, M4A, WAV, AIF and AIFC. Control is possible both from the app and from an optional remote control that offers track switching, volume, presets and source selection. This element makes the HB 68 II not only a top DSP processor but also a full multimedia system hub.
Main features
- Four-channel Class AB amplifier with integrated DSP.
- 8-channel DSP processor with 31-band equalizer.
- 4 × high-level input for connecting factory head units.
- 2 × RCA input and 8 × RCA output.
- Detailed tuning of crossovers, delay, polarity and levels.
- Bluetooth 5.1 for wireless music streaming.
- Built-in music player supporting MP2, MP3, MP4, WMA, APE, FLAC, AAC, M4A, WAV, AIF and AIFC formats.
- Full compatibility with PC software and a mobile app for DSP control.
- Optional remote control connection for volume, presets and signal sources.
- Plug & Play design and compact dimensions.
Harmony Blue Note model line
The Italian brand Harmony was born in the 1980s along with the first home speakers from the Italian hi-end manufacturer ESB Audio. Production of car speakers began in the 1990s with a wide range of products that combined high sound quality with a significantly lower price than ESB Audio products. That was and remains Harmony’s mission – to provide a high standard of sound quality with faithful reproduction across the spectrum, outstanding craftsmanship, all at a more accessible price. The same applies in 2023, when Zapco decided to create a new Harmony product line. And why Blue Note? With this term Zapco recalls the Blue Note jazz era from 1930 to 1950. It is a way to connect the audio product name with key moments in modern music history. Harmony now returns to the market with a wide range of DSP amplifiers that will expand with additional products to offer a complete lineup and meet the needs of all music enthusiasts.
About Zapco amplifiers
Zapco is the oldest high-end car-audio brand in the world, specializing in top-tier amplifiers and DSP processors for cars. The company was founded in the USA in 1974 and has since collected award after award. These honors come both from prestigious organizations that evaluate product quality and innovation and from worldwide competitions focused especially on sound quality. Zapco amplifiers represent uncompromising audiophile quality, define standards and set the criteria by which other products in the field are judged. For over 45 years Zapco has continually sought innovative ways to bring better sound to the automotive environment, and this tireless pursuit of absolute sound quality brings new technologies and high-end products. Why? Because nothing else can grab the soul and bring tears to your eyes like music. With music you can dance for joy... of all the arts, music has the strongest and most immediate effect on body and mind. Reproducing music in all its beauty and subtlety deserves nothing less than the greatest effort from all Zapco employees. Also because music matters!
| Catalog number | HB 48 II 4A |
| Brand | Zapco |
| Links | Official web presentation (English) |
| 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. | A/B |
| Number of amplifier channelsAmplifiers are divided into: - Monoblocks - 2-channel - 3-channel - 4-channel - 5-channel - 6-channel - multi-channel Each channel is used to power one speaker for the coaxial type, or one side if they are component speakers. Monoblock type amplifiers are mainly used for subwoofers. 2-channel are suitable for both subwoofers and, for example, the front pair of speakers in a car. 3-channel is used for front or rear speakers + subwoofer. 4-channel are used for front + rear speakers or 1 pair of speakers + subwoofer. 6 or 5-channel are used for 2 pairs of speakers + subwoofer, most often. Bridging means connecting the amplifier to a bridge, using the + pole from one channel and the - pole from the other channel. In most cases this is shown as "BRIDGED" on the amplifier. | 4 |
| RMS power into 4 ΩRMS power when loading speakers or subwoofer at 4 Ω. RMS power is the constant power of the amplifier and is one of the most important parameters when choosing an amplifier. | 4 x 23 W |
| RMS power into 2 ΩRMS power when loading speakers or subwoofer at 2 Ω. RMS power is the constant power of the amplifier and is one of the most important parameters when choosing an amplifier. | 4 x 35 W |
| Frequency rangeThe ability of the amplifier to reproduce the signal from the lowest frequency to the highest = faithfully reproduce the 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. | 20 - 20000 Hz |
| Harmonic Distortion (THD)Total harmonic distortion indicates how much the input signal is distorted in the amplifier. Distortions appear as overtones contained in the output signal. The proportion of originally absent parts of the signal is given as a percentage, typical values are between 0.001% and 0.5%. Distortion is measured in their power band. If it exceeds the limit of 0.7% from a certain power, it is the value of the output power of the given amplifier, from which it no longer plays without distortion and from which the distortion usually increases steeply, so that no further increase in power can be counted on. The lower the value, the better. | < 0.05 % |
| Signal-to-noise ratioThe signal-to-noise ratio means that the output signal always contains noise. The signal-to-noise ratio expresses how much of this noise is compared to the useful signal. The so-called A value is given, which does not take deep and very high frequencies into account. This corresponds to the characteristic of human hearing, which is not so sensitive to deep frequencies, especially below 1 kHz. The higher the value, the better the amplifier is. | > 100 dB |
| Inputs | 2 x RCA, 6 x Hi-Level, Bluetooth, AUX, optical |
| Outputs | 8 x RCA |
| On-board voltage rangeThe ability of the amplifier to operate at a specified voltage. As the voltage decreases, so does the power of the amplifier. The ideal voltage in a car is between 13.8 and 14.4 V. | 12 - 14.4 V |
| High level inputsThe high-level input on the amplifier allows connection directly to the existing speakers in the car without additional purchase of an external high/low adapter. Important equipment in the case of installing an amplifier on an original car radio. | Yes |
| Automatic on and offThis function allows you to automatically switch on the amplifier. | Yes |
| Integrated DSP processor | Yes |
| Number of DSP processor channels | 8 |
| Socket input terminalsFerrule terminals allow better wiring contact to the amplifier. It is also a more secure form of terminals. If you are tightening the sleeve terminals, we recommend retightening them after 1 day, as the connected cable gradually compresses. | Yes |
| Input for wired remote controlIf the amplifier has a remote control input. | Yes |
| Remote control included in the packageSome models of amplifiers also come with wired remote controls in the package, which on one side plug into the amplifier and on the other side 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. | No |
| Dimensions of the amplifier | 160 x 115 x 45 mm |
