lengcm 0 Report post Posted May 15, 2003 What is the difference between feqeuency response and bandwidth if any? Share this post Link to post Share on other sites
Mackie 0 Report post Posted May 16, 2003 (edited) Let me try.... Freq response: The freq range that an audio product can reproduce, be them cans, speakers, amps or cdps. The basic requirement is to meet the aural range of humans ie 20-20KHz. However, in the case of transducers/speakers, they tend to roll off on the bottom end eg, around 35Hz for my PPM2 speakers. Generally, bookshelf speakers have a higher roll-off freq than floorstanders, thus, implying the latter can produce deeper bass....well at least on paper. What this means is that signals below the speakers' roll-off freq will not be reproduced with low distortion. Bandwidth: The basic definition is that it is the width of the spectrum that a signal occupies. The bandwidth of a radio signal is generally related to the audio quality for either analogue or digital radio systems but that is not the whole story because bandwidth has very different definitions for analogue bandwidth and digital bandwidth. Bandwidth of an analogue signal is the difference in frequency between the highest and lowest frequencies contained in the signal. A signal might contain frequencies outside of a band that it is supposed to use, so the signal is passed through a filter which removes the frequency components outside of what is called the filter’s passband. For example, the difference between the highest and lowest frequencies of the passband will be the bandwidth of the filter. Usually, the bandwidth of a filter will be defined as the difference between the higher and lower frequencies at which the power is half that in its passband. A signal on the other hand might be defined by its bandwidth between the frequencies at which its power is far lower than half that of its passband. This is because the frequency components at the edge of a band have to be very small (attenuated) so that they don’t interfere with the frequency components of a signal that is transmitted in an adjacent band. An example of analogue bandwidth of a signal would be the range of frequencies that contain 95% of all the power in the signal or possibly 99% of the power of the signal. Edited May 16, 2003 by Mackie Share this post Link to post Share on other sites
Northern Oak 0 Report post Posted May 16, 2003 Just adding onto what Mackie has mentioned: Frequency response usually relates to a frequency response plot/curve on a log scale which shows from 1Hz all the way up to any range you can think of (1MHz, 1GHz etc etc). This plot shows at each particular frequency, what is the corresponding amplitude/gain. As such, if the gain is higher at the lower frequency (1Hz ~ 150Hz), then it meant that is has an emphasized bass. As explained earlier by Mackie about analogue bandwidth, 2 more points to add here, esp. for DIYers. Each amp design has a constant gain bandwidth product, GBW, which is the (Gain x Bandwidth). If you choose to increase the gain by playing with the input resistor and feedback resistor values, you will decrease the bandwidth of your amp. If you are looking at the frequency response curve, usually the gain/amplitude is given in dB (decibels). So when Mackie mentioned about half the power in the passband, it would relate to the (passband value - 3dB) points. Share this post Link to post Share on other sites
dreaming 0 Report post Posted April 15, 2007 (edited) 0,1Hz to 45KHZ Any comments Edited April 25, 2007 by dreaming Share this post Link to post Share on other sites
