Banner
Banner
cookie-banner

Sensitivity

tx-nr906-rear-panel

The Aux and Multi-Channel analogue inputs of a receiver need adequate sensitivity. They should measure 200mV-400mV.

WHAT IT TELLS US

Sensitivity is a measure of the magnitude of input signal needed for a receiver to produce full output, at maximum volume. This tells us what external analogue signal sources the receiver can handle, and produce full output if required. Since receivers rely mainly upon digital inputs and an internal tuner section, input sensitivity is not an issue unless an external phono stage is to be used for playing LPs. Then a high sensitivity of around 200mV is most useful.


When feeding input Analogue-to-Digital converters however (i.e. out of Direct mode), input overload is an issue, overload occurring at 1.8V - 2.5V. This is low enough to overload to occur if an external CD player is connected up through the analogue inputs. CD players should always be connected digitally, where possible.

Phono stage sensitivity is measured to ensure it is adequate for for MM cartridges. Around 5mV at 1kHz is needed here for full output form a receiver.




rs-upl



HOW WE MEASURE IT

A 1kHz sine wave is fed to a line input. The input level, in millivolts (mV), needed to deliver maximum output at full volume is measured and is the input sensitivity.


The same procedure is used with phono stages, only though a screened input network with a direct connection across the input terminals to read p.d., important with low input impedance phono stages that can load the signal generator.

 

Add your comment

Your name:
Subject:
Comment:
  The word for verification. Lowercase letters only with no spaces.
Word verification:

Search

Hi-Fi World, Powered by Joomla!; Hosted by Joomla Wired.