Total harmonic distortion or THD is among the more regular little T.L.A.s (or Three letter acronyms) you are likely to see in many manufacturers specifications. But what exactly is THD, is it all that important and what degree of THD is acceptable for HiFi and AV equipment?
In audio reproduction between the input stage and output stage of hifi racks you will see some noise and distortion introduced to a signal. Some of this distortion is created through the circuits and physical elements introducing signal harmonics at double and triple the frequencies of the original signal. These added signals are technically referred to as Harmonic Distortion. THD is actually a way of measuring the differential in between the input stages from the system as well as the audible extra signal at each harmonic. The THD calculation doesn’t take into account the relative level of each harmonic. EG: One amplifiers output on the 2nd harmonic could be more than the output in the 3rd. Another could create equal levels in the 3rd and 5th. The two amps would sound very different yet could have the same measured overall THD.
Generally in most hifi circuits such as amplifiers and pre amps one should expect a value of under 1% THD because it is easy to remove a lot of THD from amplifier circuits using various techniques. Unfortunately it is far harder to stop significant amounts of THD from being produced by the physical elements of a setup like the Topping NX4 DSD. Much higher levels of THD are common in cheaper end speakers especially at higher volumes. Speakers with higher levels THD have a tendency to cause “smearing” of audio, and lead to poor imaging along with a “muddy” sound. In reality one should test a component ideally within the room it is to be found in and at a volume level it is likely to commonly be heard at to find out if the system is acceptable for purpose.
Your house cinema system or audio visual system will need a specific amount of cabling to maximise the available audio quality of the system. Therefore you will need to improve your equipment with digital connections to every audio visual component to get the best listening experience. The very fantastic news is you can obtain noticeable sound quality improvements from your own home cinema system through using suitable digital HDMI interconnects (High Definition Multimedia Interface).
In the following paragraphs we explode the market biased HDMI Cable Reviews and demonstrate how with inexpensive standard HDMI cable it is possible to achieve excellent results and improve your home cinema listening experience and get noticeable sound quality improvement via your audio visual system utilising the available digital connections.
Choosing the best HDMI cables for your own system is a reasonably straightforward process and there are some things to be considered before buying. Firstly, tend not to get brainwashed by retail shops that make an effort to sell the eeogzu expensive cables because they would like you to spend whenever possible instead of knowing the needs or requirements of your home cinema setup – don’t be fooled.
What exactly HDMI Cable would be best designed for my home cinema system?
Firstly, the essential principle behind HDMI would be to transmit uncompressed digital data via 2 interfaces and digital data cables ought to be mainly compared by the caliber of the constituents and manufacture. The Shanling CD player available seem to focus on the more you may spend the greater you achieve – well stop and you better think again. Top quality creation of an affordable HDMI connector cable gives the same results as spending 10x or 20x more.