An amplifier's impedance is the primary factor for tuning it to your system. Most amps have a slight negative resistance that causes an acoustic shock during the signal's transmission from the preamp to the power amp. This interaction can cause distortion, artifacts, and general bad sound quality.
However, some amplifiers utilize different techniques to achieve their desired specifications without negatively affecting the sound quality of your music or other audio signals. To get best musical fidelity amplifier check out here.
For this reason, it is important to select an amplifier that adheres to industry standards rather than manufacturer-specific guidelines. The more you know about what you are looking for in an amplifier, the easier it will be to find one that fits your requirements.
Using an accurate test CD such as a Pure CD or Jitter-X to check the sonic integrity of your music before you buy an amplifier can help you avoid the purchase of a low-quality product that can negatively affect the sound of your system.
With so many different types of amplifiers available, selecting one that you are comfortable with and fits within your budget is important. A good rule of thumb to follow is to spend no more than 10 percent of your total music system cost on any amplifier component.
All amplifiers are not created equal — sound quality varies greatly depending on which equipment they are paired with (preamps, speakers, and power amps), as well as how they were designed and manufactured. An experienced audio professional will be able to perform a technical evaluation of the amp you have.