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Product Spotlight: Hertz H8 DSP Digital Interface Processor

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Hertz DSP

Known best for its speakers and amplifiers, Hertz has recently added an impressive digital signal processor called the H8 DSP to its mix of car audio upgrade solutions. Since more and more car audio enthusiasts these days are working with factory-installed source units, Hertz focused on making its processor solution easy to integrate into these vehicles. With a full suite of tuning tools on hand for your installation technician, upgrading a vehicle audio system with the H8 DSP will transform it into something truly amazing.

Hertz H8 DSP Features

The H8 DSP features four speaker-level inputs, a pair of RCA auxiliary inputs and a TOSLINK digital input. On the output side, there are eight RCA outputs that will provide up to 4V of signal. The four speaker-level inputs will accept as much as 15V, and the RCA aux input is good for 5V. The processor also includes input level optimization LEDs to help maximize the signal-to-noise ratio of the system. Another increasingly important feature is called the Universal Speakers Simulator (USS) technology. This circuit presents an appropriate load to the factory amplifier or radio so that external load resistors aren’t required to make the system function.

Hertz includes a few welcome hardware connections that make using the H8 DSP quite convenient. First, the system includes enough memory for two tuning calibrations. External wire connections are available to let users switch between these presets quickly. The system also includes remote turn-on detection circuitry. This processing will allow the H8 DSP to turn itself on when it detects that the factory radio turns on. There’s also a remote output, so the processor can then turn on your system amplifiers.

Hertz DSP
The Hertz H8 DSP is compact and straightforward, yet provides all the tools required to extract incredible realism from your car audio system.

The software includes an input/output configuration wizard that helps simplify the setup process. Not only does this help with signal routing, but it also enables the de-equalization process. Many factory-installed radios, including some that seem surprisingly basic, include speaker-specific equalization processing. The de-equalization process uses a test track (available as a download from the Hertz website) to undo the factory EQ curve as much as possible. The wizard also sets up some basic crossover settings that mean the system can be up and playing very quickly before the fine-tuning begins. This feature gives your installation technician a level playing field from which he or she can start the calibration process of your new speakers.

Hertz DSP
Part of the setup process allows for intuitive channel assignment.

Signal Processing Features

In Expert mode, any of the eight channels can be configured with high- and low-pass filters with the option of Butterworth or Linkwitz-Riley filters with slop options up to -24 dB/octave. Crossover points aren’t infinitely adjustable, but there are 68 frequency options available – which is more than enough for any possible system design.

In terms of equalization, there are 31 bands, spaced at standard 1/3-octave spacing. Each band is adjustable on 0.3 dB steps up to plus or minus 12 dB. There’s a cool “select all” button that lets your installer change all the bands at once. This is a great feature if the person tuning your system needs more than 12 dB of cut or boost in a single band, as the entire set of slides can be moved at once.

Your installer can enter the distance between the listening position and the speaker, and then the processor will calculate the delay for each output. There’s a fine-tuning window that lets them add additional delay in 0.02-millisecond steps. There is also a polarity adjustment control of each channel that is labeled as “Invert Phase.”

The level of each of the eight output channels can be adjusted in 0.5 dB steps from 0 to -40 dB. There is a master volume control setting that works in 1 dB steps from 0 to -60 dB and a master subwoofer level control that provides 0.5 dB steps from 0 to -12 dB.

Hertz DSP
The H8 DSP PC interface allows for all settings to be configured from a single screen for excellent efficiency.

DRC HE Remote Control

The H8 DSP ships with the DRC HE remote control. This compact (2.48- by 1.4-inch) remote includes five buttons and a small 4.5-character, 12-segment display. The remote provides master volume control, subwoofer level control and balance and fader adjustment. The presets can also be toggled by the remote, along with the source input (speaker, aux, or digital). The included connection cable is 14.76 feet (4.5 meters) long. Finally, two-sided tape is included to surface-mount the remote in your vehicle.

Since the processor can operate in a stand-alone mode using the remote as the master on/off switch, it doesn’t require a traditional source unit to be in your audio systems. You can play music from a smartphone through a Bluetooth receiver or a media player like the Audison bit Play using the TOSLINK digital connection.

Hertz DSP
The H8 DSP includes the DRC HE remote control that makes system adjustments easy from the driver’s seat.

Upgrade Your Car Audio Experience with the H8 DSP

Whether you have an existing sound system or are planning a new build, having a signal processor like the Hertz H8 DSP in the system is a worthwhile investment. Drop by your local authorized Hertz retailer for a demonstration today! For more information about Hertz car audio products, visit their website, Facebook page, Instagram page, Twitter feed or YouTube channel.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Everything You’ve Wanted to Know About Audio Distortion – Part 1

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DistortionWhen we talk about any signal, be it audio, video or data, there is an accompanied reality for alterations and errors made to that signal as it passes through different electronic components, conductors or magnetic fields. While we get concerned when we hear that a component introduces distortion or when we read distortion specifications, distortion is part of nature and is simply unavoidable. Until any distortion reaches a significant level in an analog signal, it can’t be heard or seen.

Starting With A Foundation in Audio Distortion

With that in mind, let’s create a foundation for observing and understanding the properties of an audio signal in the electrical and frequency domains. This information will serve as the foundation for understanding distortion in part two of this article.

Any signal, be it Direct Current (DC) or Alternating Current (AC), can be analyzed in two ways – in its time domain or frequency domain. Understanding the difference between these two observation domains will dramatically simplify the life of anyone involved in the mobile electronics industry.

When we observe a signal in the time domain, we are looking at the amplitude of the signal relative to time. Normally, we would use a voltmeter or oscilloscope to look at signals in the time domain. When we consider a signal in the frequency domain, we are comparing the amplitude (or strength) of individual frequencies, or groups of frequencies within the signal. We use an RTA (real time analyzer) on a computer or handheld/benchtop devices to look at the frequency domain.

Direct Current

When analyzing the amplitude of an electrical signal, we compare the signal to a reference; in 99% of applications, the reference is known as ground. For a DC signal, the voltage level remains constant with respect to the ground reference and to time. Even if there are fluctuations, it is still a DC signal.

If you were to chart the frequency content of a DC signal, you would see it is all at 0 hertz (Hz). The amplitude does not change relative to time.

Let’s consider the DC battery voltage of your car or truck. It is a relatively constant value. Regarding amplitude versus time, it sits around a 12.7-12.9 volts on a fully charged battery with the vehicle off. When the vehicle is running and the alternator is charging, this voltage increases to around 13.5 to 14.3 volts. This increase is caused because the alternator is feeding current back into the battery to charge it. If the voltage produced by the alternator was not higher than the resting voltage of the battery, current would not flow and the battery would not be recharged.

Alternating Current

AC Signal – Time

DistortionIf we look at an AC signal, such as a 1 kHz tone that we would use to set the sensitivity controls on an amplifier, we see something very different. In the case of a pure test tone like this, the waveform has a sinusoidal shape, called a sine wave. If we look at a sine wave on an oscilloscope, we see a smoothly rolling waveform that extends just as much above our reference voltage as it does below.

AC Signal – Frequency

DistortionIt is now wise to look at this same signal from the perspective of the frequency domain. The frequency domain graph will, if there is no distortion, show a single frequency. In consideration of an audio signal, the amplitude (or height) of that frequency measurement depends on how loud that single frequency is relative to the limits of our recording technology or measurement device.

Audio

When we listen to someone speak or play a musical instrument, we hear many different frequencies at the same time. The human brain is capable of decoding the different frequencies and amplitudes. Based on our experiences, and the differences in frequency and time response between one ear and the other, we can determine what we are hearing, and the location of the sound relative to ourselves.

Analyzing the time domain content of an audio signal is relatively easy. We would use an oscilloscope to observe an audio waveform. The scope will show us the signal voltage versus time. This is a powerful tool in terms of understanding signal transmission between audio components.

A Piano Note

Middle C – Time

DistortionLet’s look at the amplitude and frequency content of a sound most of us know well. The following graph is the first 0.25 seconds of a recording of a piano’s middle C (C4) note in the time domain. This represents the initial hit of the hammer onto the string. If you look at the smaller graph above the larger one, you will see the note extends out much further than this initial .25 second segment.

Middle C – Frequency

DistortionWe know that the fundamental frequency of this note is 261.6 Hz, but if you look at the frequency domain graphs, we can see that several additional and important frequencies are present. These frequencies are called harmonics. They are multiples of the fundamental frequency, and the amplitude of these harmonics is what makes a small upright piano sound different from a grand piano, and from a harp or a guitar. All of these instruments have the same fundamental middle C frequency of 261.6 Hz; their harmonic content makes them sound different. In the case of this piano note recording, we can see there is a large spike at 523 Hz, then increasingly smaller spikes at 790 Hz, 1055 Hz, 1320 Hz and so on.

Sine vs Square Waveforms

Every audio waveform is made up of a complex combination of fundamental and harmonic frequencies. The most basic, as we mentioned, is a pure sine wave. A sine wave has only a single frequency. At the other end of the spectrum is a square wave. A square wave is made up of a fundamental frequency, then an infinite combination of odd-ordered harmonics at exponentially decreasing levels. Keep this in mind, since it will become important later as we begin to discuss distortion.

Noise Signals

Noise is a term that describes a collection of random sounds or sine waves. However, we can group a large collection of these sine waves together and use them as a tool for testing audio systems. When we want to measure the frequency response of a component like a signal processor or an amplifier, we can feed a white noise signal through the device and observe the changes it makes to the amplitudes of different frequency ranges.

White Noise – Time

DistortionYou may be asking, what exactly is white noise? It is a group of sine waves at different frequencies, arranged so the energy in each octave band is equal to the bands on either side. We can view white noise from a time domain as shown here.

White Noise – Frequency

DistortionWe can also view it from the frequency domain, as displayed in this image.

Variations In Response

The slight undulations in the frequency graph are present because it takes a long time for all different frequencies to be played and produce a ruler-flat graph. On a 1/3-octave scope, the graph would be essentially flat.

Foundation For Time And Frequency Domains

There we have our basic foundation for understanding the observation of signals in the time domain and the frequency domain. We have also had our first glimpse into how harmonic content affects what we hear. Understanding these concepts is important for anyone who works with audio equipment, and even more important to the people who install and tune that equipment. Your local mobile electronics specialist should be very comfortable with these concepts, and can use them to maximize the performance of your mobile entertainment system.

If you’ve made it this far and want to learn even more about audio distortion, stay tuned for Part 2 of this article!

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

 

Product Spotlight: Sony XAV-AX5500 Bluetooth Media Receiver

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Sony XAV-AX5500

Sony’s new XAV-AX5500 media receiver not only covers all the ground, but it also raises the bar in terms of smartphone connectivity. Equipped with WebLink 2.0, you can see and control your compatible smartphone right from the 6.95-inch touchscreen on the radio. Of course, Apple CarPlay, Android Auto, high-quality Bluetooth audio streaming and all the digital media support you’d ever want are also included. Let’s check it out!

Same Great Look with New Features

Sony XAV-AX5500The Sony XAV-AX5500 is an evolution of Sony’s famous XAV-AX5000 media receiver. The upgrades include WebLink 2.0 smartphone display technology that lets you cast most apps to your radio to see and hear all the action. Commands from the radio screen are fed back to the phone for easy and intuitive control. Waze and YouTube are two of the most popular applications for WebLink, and both offer an app icon on the WebLink home screen.

Users can upload home screen background images to the the XAV-AX5500 to express their style by personalizing the installation to their vehicle.

The XAV-AX5500 includes 5-volt preamp outputs instead of the 2 volts of signal available from the AX5000. This extra voltage will allow your installer to turn down the sensitivity controls on any external amplifiers to reduce background noise.

Apple CarPlay and Android Auto Smartphone Connectivity

Sony XAV-AX5500The AX5500 continues to offer Apple CarPlay and Android Auto smartphone connectivity with its plug-and-play USB port. Both of these phone interface technologies use voice recognition to make it quick, safe and easy to access your music, make phone calls or send text messages using plain-English voice commands. Likewise, you can get turn-by-turn navigation directions to the address of your choice by simply asking.

Classic Style and Intuitive Interface Look Great in the Dash

Sony XAV-AX5500Sony has eschewed fancy colors and lines to offer a clean look that looks great in the dash of your car or truck. Six hard buttons, a large bezel-less 6.95-inch display with a capacitive touch interface and easy-to-understand menu options make this radio look great while streamlining the process of learning all the functions.

The AX5500 includes Bluetooth hands-free calling with an external microphone and high-quality audio streaming with album art display capability, thanks to AVRCP 1.3. You can have your retailer upgrade the radio with an SXV300v1 SiriusXM satellite radio tuner module for genre-specific music, information and entertainment.

Dual USB ports allow you to connect your smartphone for Apple CarPlay, Android Auto or WebLink Cast connectivity and play MP3, WMA or FLAC audio, or MP4, WMV or MKV videos from a USB memory stick connected to the other port. The USB ports provide 1.5 amps and 500 mA of charging current.

Vehicle Integration Features

Sony XAV-AX5500The XAV-AX5500 has a dedicated backup camera input jack so your installer can connect a backup camera and have it display automatically when the vehicle is in reverse. The radio also includes support for steering wheel audio control interfaces so you can use the factory buttons to change volume, tracks or stations.

The amplifier built into the AX5500 is rated to produce 20 watts of power into each of four channels. The radio includes adjustable electronic crossovers so that the built-in amp can be optimized for use with an external subwoofer system. Speaking of signal processing, the radio includes Sony’s Dynamic Soundstage Organizer. It helps create a realistic soundstage across the dash of your vehicle and is adjustable to accommodate any type of vehicle. Your installer can further fine-tune the sound of your system with the built-in 10-band equalizer and Extra Bass processing.

Installer-Friendly Design

Sony XAV-AX5500Your installer will love integrating the XAV-AX5500 into the dash of your vehicle, thanks to the compact chassis design. Instead of being 4 inches tall by about 6 inches deep, the rear chassis is 2 inches tall and an inch shorter. This design leaves more room for interface modules, wiring and RCA cables that are typically tucked behind the unit.

Upgrade Your Driving Experience with the Sony XAV-AX5500

If you’re shopping for a new radio for your car or truck, drop by your local authorized Sony car audio retailer and ask for a demonstration of the XAV-AX5500. From its intuitive interface, great looks and quick start-up process to the fantastic features and sound quality, we are sure you’ll be impressed. To learn more about this radio or any of the amazing Sony car audio products, visit their website. Be sure to follow them on Facebook, Twitter and Instagram to stay up-to-date with the latest product releases.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Adding Navigation To The Factory Color Screen In Your Vehicle

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Adding NavigationLet’s say you purchased a brand-new Dodge Journey, Chevy Silverado or Ford F-150. The vehicle has a big color display for the audio system, and it may even show the heating and air conditioning controls on the same screen. But alas, it would have cost several thousand dollars to add the factory navigation system because the option package it was in included features you didn’t want. A sunroof, leather upholstery or automatic climate controls are all great options – but if adding navigation is what you want, then why pay for options you don’t need? Fear not – your local specialist car audio retailer can help you out.

Add-On Navigation Systems

Adding Navigation
The NTV-KIT607 Toyota Navigation Kit From NAV-TV.

Companies like NavTV and Advent have developed add-on navigation systems that work with factory radios and their color displays. The systems include a navigation computer and an integration module that allows graphics to be displayed on the factory screen. Many vehicles with a factory touchscreen can have those input commands fed into the navigation module. There are also some navigation kits that include their own touchscreen overlays for vehicles that don’t include a touch interface.

Expert Installation Required

The installation of these systems is plug-and-play. That being said, a great deal of vehicle disassembly is often required to make all the connections to the factory screen. Some vehicles require the touchscreen panel itself to be taken apart. Taking your new car apart is not something that should be done by someone without extensive experience. Panels can easily be scratched or crack if they are not maneuvered properly. It is best to seek out the assistance of a trained and experience installation technician. He or she will also need to locate the GPS antenna, connect to the factory audio system wiring for voice prompts and tap into the vehicle CAN bus.

Benefits Of Navigation

Adding Navigation
iGo offers enhanced safety and convenience while driving.

Navigation is more than just an intelligent mapping system. If you are traveling in an area that you are not familiar with, having maneuver prompts before having to turn or exit an interstate is not only convenient, but can reduce the chances of having to make a sudden and potentially dangerous lane change. It has also been proven that navigation systems save fuel by reducing the chances of getting lost or missing an exit.

Navigation Software

Adding Navigation
Full-Feature controls are offered by the iGo navigation systems.

Different manufacturers use different navigation software applications – Garmin and iGo are amongst the most popular. The mapping in the systems can be upgraded in the same manner as an aftermarket navigation radio: with downloads available from a manufacturer’s website. These systems include street addresses as well as Points of Interest (POI) information, so you can search for the name of a restaurant or hotel.

Want To Learn More About Adding Navigation?

If you have a vehicle from Ford, Chrysler, GM, Nissan, Honda or Toyota and would like to find out if you can add navigation to the factory screen, visit your local BestCarAudio.com specialist. They would be happy to research availability for the make, model and trim level of your vehicle. They can provide an estimate to supply the product, as well as install it for you. Give them a call today.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Product Spotlight: Hertz Mille Pro Speakers

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Hertz Mille Pro

Hertz Mille Pro speakers are designed for car audio enthusiasts who demand world-class performance and impressive value. The Mille Pro series includes five component speaker systems, a pair of coaxial speakers, or drivers in a-la-carte pairs for an actively filtered system. Trickle-down technology from the esteemed Legend Series helps to ensure that music lovers can find a solution that fits their needs.

Hertz Mille Pro Speaker Systems

Starting with the flagship MPK 1650.3 Pro, this two-way component speaker set includes a pair of 6.5-inch MP 165P.3 woofers, two MP 28.3 1 3/8” tweeters and a set of MPCX 165.3 passive crossover networks. The woofers are based on a cast aluminum alloy basket and use a 1-inch polyamide voice coil former with a 0.55-inch tall winding. The woofers have a nominal impedance of 3 ohms to maximize the power production capabilities of the connected amplifier. Xmax is specified at 4.5 mm, and power handling is a healthy 125 watts continuous. The woofer cones are made from a pressed pulp paper with cotton fibers, and they feature an exponential-curve deep-V shape. The cone is attached to a rubber surround that Hertz calls “Boundary Free” in reference to the smooth transition between the area that attaches to the cone and the outer roll. The MP 28.3 tweeters have a 1.1-inch voice coil and use lightweight CCAW wiring to assist with amazing transient response. The Tetolon fiber domes work with tuned rear chambers to deliver an extremely low resonant frequency of 900 Hz. This low Fs value allows for low crossover points and improves the overall dispersion performance of the set. The passive crossover networks include tweeter level attenuation switches and two contour settings to compensate for different tweeter installation positions.

The MPK 165P.3 Pro set uses the same 6.5-inch MP 165P.3 woofers as the above system with a set of MP 25.3 1.14-inch tweeters. These smaller tweeters are more suitable for integration into factory pods in sail panel, A-pillar and door locations. The crossover point in the included MPCX 2P.3 crossovers is at 4 kHz instead of 3 kHz, as in the 1650.3 Pro set.

Hertz Mille Pro
The MP 165P.3 Pro woofers feature a large 95 mm ceramic magnet for great efficiency in a package with a mounting depth of only 2.52 inches. Optional mesh grilles are available for custom installations.

The MPK 165.3 Pro Set uses the MP 25.3 tweeters with a set of 6.5-inch MP 165.3 woofers. These woofers retain the cast aluminum basket, pressed cotton and pulp-paper cone, the Boundary Free surround and a 1-inch voice coil design. Power handling is somewhat more modest at 110 watts, and Xmax is plus or minus 4 mm. The MPCX 2.3 crossovers have a 0 or +2 dB tweeter adjustment and filter the drivers at 3.5 kHz.

For those who require a three-way speaker solution, the MPK 163.3 Pro system adds a pair of MP 70.3 3-inch midrange drivers to the MPK 165.3 set. The mids feature a cast basket, dual neodymium magnets, cotton and pressed-pulp cones, and the Boundary Free rubber surround design. With a resonant frequency of 110 Hz and Xmax spec of 1.5 mm, these mids play down to 450 Hz with the included MPCX 3.3 passive networks.

Hertz Mille Pro
The three-way MPK 163.3 Pro set is a great upgrade solution for factory-installed audio systems that use a woofer, midrange and tweeter in the front stage speaker system.

For those who need a 5.25-inch component set, Hertz offers the MPK 130.3 Pro system. The system uses the MP 25.3 tweeters with a pair of MP 130.3 woofers. The woofers have cast baskets, and the same cone and surround design as their big-brother 6.5-inch speakers. The system includes the same MPCX 2.3 crossovers as the MPK 165.3 set.

High-Performance Coaxial Speaker Sets

There are two coaxial speaker options in the Hertz Mille Pro Series. The MPX 165.3 Pro set is a pair of two-way 6.5-inch speakers that use a 1-inch tweeter mounted at the very base of the woofer cone. The woofer uses a 1.42-inch voice coil former so that there is enough room for the tweeter to fit inside. The same paper-cotton cone and surround woofers design complement soft Tetolon diaphragms in the tweeters. Hertz added an acoustic lens on top of the tweeter to help improve off-axis performance.

Hertz Mille Pro
This cutaway view of the MPX 165.3 Pro shows the complexity involved in integrating a tweeter into the pole-piece of a woofer. The capacitor for the tweeter crossover is integrated into the assembly that bolts into the woofer.

The MPX 690.3 Pro is a set of 6×9-inch three-way speakers. The large oval woofer is complemented by a 1.4-inch soft-dome tweeter and a 1.14-inch super-tweeter. Both use the soft-dome Tetolon design with crossover points of 4 and 10 kHz, respectively, to deliver even dispersion both on- and off-axis. Power handling is rated at 130 watts, and the woofer has an Xmax spec of plus or minus 4 mm.

Premium Speaker Upgrades for Every Application

The Hertz Mille Pro series fits perfectly between the Mille Legend and the Energy speakers. The offerings combine great power handling, flexible installation options and the reputation for performance that has made Hertz one of the best-known speaker manufacturers in the car audio industry. For more information about these speakers, visit the Hertz website and be sure to follow them on Facebook, Twitter, Instagram and YouTube.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.