By John Siau
April 4, 2014
High-Resolution Audio systems offer the promise of an extended high-frequency range. High-Resolution digital systems now operate at 2 to 4 times the sample rate of the standard CD. This means that these systems have the capability of extending the playback frequency range well above the 22 kHz limit of the standard CD. Does this added high-frequency range improve our listening experience? How high is high enough? Do we really need anything over 20 kHz?
In the previous post I stated that "High-Resolution Audio will only truly arrive when the sum total of all defects in the audio chain become inaudible". In that post I discussed the need for low noise components. In this post I will look at frequency response. How much bandwidth do we need to satisfy the 20 Hz to 20 kHz limitation of the best human ears? Is a 20 kHz bandwidth good enough for High-Resolution Audio? If not, why not?
Let's assume we have a playback system consisting of a CD player, a preamplifier, a power amplifier and speakers. If each of these has a 20 Hz to 20 kHz frequency response, is this sufficient to reproduce all of the frequencies we can hear? The short answer is no. Here is why:
The frequency response of a system can be determined by summing the frequency response of each component in the audio chain. If two components are - 3 dB at 20 kHz, then together they are - 6 dB at 20 kHz. If we look at our example system, we have four components in the chain: CD player, preamplifier, power amplifier, and speakers. If all are -3 dB at 20 kHz, then we have a system response that is -12 dB at 20 kHz. Worse yet, this system will typically measure -4 dB at 10 kHz. This system will not come close to meeting the performance of our ears! Each individual component was well matched to the limitation of our ears, but as a system, these components cannot achieve anything resembling High-Resolution Audio.
If we want to accurately reproduce 20 kHz audio, the frequency response of each component must extend well beyond 20 kHz. For this reason, Benchmark products are engineered to achieve a 200 kHz to 500 kHz bandwidth. Is this excessive and unnecessary? To answer this, let's replace each of the four components in our sample system with components that have a 200 kHz bandwidth. The combined system now measures - 4 dB at 100 kHz, - 0.8 dB at 50 kHz, and about - 0.2 dB at 20 kHz. This simple 4-component signal chain achieves a 100 kHz bandwidth and is well-matched to the 96 kHz bandwidth of a 192 kHz digital sample rate. We could legitimately argue that the region between 20 kHz and 100 kHz may offer little musical content, and even if it does, we may not be able to detect its presence. The real benefit is that we have preserved the entire 20 Hz to 20 kHz bandwidth after passing through four audio components in a typical playback system.
Professional audio systems often have very long analog signal chains. These applications place difficult demands on the frequency response of each analog component in the chain. A chain of 16 analog components, each with a bandwidth of 20 kHz, will produce an overall response of about - 3 dB at 5 kHz. This is telephone quality at best! If the same system is built with 200 kHz components, the overall response will be - 3 dB at 50 kHz, and about -1 dB at 20 kHz. Benchmark's founder, Allen H. Burdick, identified this problem when investigating the poor performance of analog audio distribution within television facilities in the mid 1980's. Performance of these analog systems was improved significantly by increasing the bandwidth of the analog distribution amplifiers. More details on this subject can be found in chapter 3 of "A Clean Audio Installation Guide" by Allen H. Burdick. Modern video systems use digital audio distribution and are not subject to these cumulative effects.
In summary, very high bandwidth is required at each link in the audio chain if we want to assemble a High-Resolution system. Audio components and digital formats that just meet the requirements of the human ear may be entirely inadequate when connected together in a chain. The audio chain is nowhere near as strong as the weakest link!
As an engineer I like to use "rules of thumb" to make quick estimates that help to explain the physical world around me.
These rules of thumb are easy-to-remember approximations that eliminate the need for complicated and needlessly precise calculations.
If you feel discombobulated by the complexities of high school physics, there is hope! I encourage you to step back and take a fresh approach.
If you learn a few simple rules of thumb, you can unravel mysteries of the physical world, amaze your friends, and yourself.
In this paper I will present 15 simple rules that I find useful when working with music and audio.
- John Siau
The Benchmark AHB2 power amplifier and HPA4 headphone amplifier both feature feed-forward error correction. This correction system is an important subset of the patented THX-AAA™ (Achromatic Audio Amplifier) technology. It is one of the systems that keeps these Benchmark amplifiers virtually distortion free when driving heavy loads. It is also the reason that these amplifiers can support 500 kHz bandwidths without risk of instability when driving reactive loads.
This paper explains the differences between feedback and feed-forward systems. As you read this paper, you will discover that you already understand the benefits of feed-forward correction because you use it instinctively to improve a feedback system commonly found in your automobile. If feed-forward correction can improve your driving experience, it may also improve your listening experience!
If you look at the back of any Benchmark product, you will find balanced XLR analog-audio connectors. As a convenience, we also provide unbalanced RCA connectors on many of our products. In all cases, the balanced interfaces will provide better performance.
We build our unbalanced interfaces to the same high standards as our balanced interfaces, but the laws of physics dictate that the balanced interfaces will provide better noise performance.
This application note explains the advantages of balanced interfaces.