Cordless speaker producers typically publish the frequency response of their goods which, unfortunately, does not automatically show you a great deal about the audio quality. I am going to shed light on the meaning of this term and also give some suggestions on how to interpret it whilst looking for a set of cordless speakers.
A large frequency response doesn't imply the wireless loudspeakers offer excellent sound quality. By way of example a set of wireless loudspeakers with a frequency response between 30 Hz and 15 kHz may sound a lot better than another set having a response between 10 Hz and 30 kHz. Also, every producer, it appears, implements a different technique for specifying the lowest and maximum frequency of their wireless loudspeakers. Normally, the frequency response displays the standard working range of the cordless speakers. Within this range, the sound pressure level is basically constant. At the upper and lower cutoff frequencies the gain is going to drop by no more than 3 decibels.
However, a number of companies push this standard to the limit and may list a maximum frequency where the wireless speakers are going to hardly generate a beep any more. Additionally, just looking at these 2 figures isn't going to say much about the linearity of the frequency response. A complete frequency response graph, however, will demonstrate whether or not there are any peaks or valleys and in addition show the way the frequency response is to be interpreted. You may also want to demand a phase response chart that gives vital hints regarding the audio quality.
You furthermore need to look at the conditions under which the frequency response was determined. You typically won't find any details about the measurement conditions, unfortunately, in the maker's data sheet. One condition which may effect the frequency response is the impedance of the speaker driver built into the wireless speakers. Standard speaker driver impedances range from 2 to 16 Ohms. The lower the loudspeaker driver impedance the greater the burden for the internal amplifier.
This change is most noticeable with a lot of cordless loudspeakers that use digital amplifiers, also called Class-D amps. Class-D amps employ a lowpass filter within their output as a way to reduce the switching components which are produced from the internal power FETs. Yet, the frequency response of the amplifier now is determined by the loudspeaker driver load because the behavior of this lowpass filter is affected by the load impedance. Generally the lower the loudspeaker driver load impedance the lower the upper cut-off frequency of the amplifier
Some amplifier topologies provide a mechanism to compensate for changes in the amplifier gain with different loudspeaker loads. One of these techniques uses feedback. The amplifier output signal after the interior lowpass is input to the amplifier input for comparison. If not created correctly, this method might cause instability of the amp though. A different approach is to provide dedicated outputs for different speaker driver impedances that are connected to the amplifier power phase through audio transformers.
A large frequency response doesn't imply the wireless loudspeakers offer excellent sound quality. By way of example a set of wireless loudspeakers with a frequency response between 30 Hz and 15 kHz may sound a lot better than another set having a response between 10 Hz and 30 kHz. Also, every producer, it appears, implements a different technique for specifying the lowest and maximum frequency of their wireless loudspeakers. Normally, the frequency response displays the standard working range of the cordless speakers. Within this range, the sound pressure level is basically constant. At the upper and lower cutoff frequencies the gain is going to drop by no more than 3 decibels.
However, a number of companies push this standard to the limit and may list a maximum frequency where the wireless speakers are going to hardly generate a beep any more. Additionally, just looking at these 2 figures isn't going to say much about the linearity of the frequency response. A complete frequency response graph, however, will demonstrate whether or not there are any peaks or valleys and in addition show the way the frequency response is to be interpreted. You may also want to demand a phase response chart that gives vital hints regarding the audio quality.
You furthermore need to look at the conditions under which the frequency response was determined. You typically won't find any details about the measurement conditions, unfortunately, in the maker's data sheet. One condition which may effect the frequency response is the impedance of the speaker driver built into the wireless speakers. Standard speaker driver impedances range from 2 to 16 Ohms. The lower the loudspeaker driver impedance the greater the burden for the internal amplifier.
This change is most noticeable with a lot of cordless loudspeakers that use digital amplifiers, also called Class-D amps. Class-D amps employ a lowpass filter within their output as a way to reduce the switching components which are produced from the internal power FETs. Yet, the frequency response of the amplifier now is determined by the loudspeaker driver load because the behavior of this lowpass filter is affected by the load impedance. Generally the lower the loudspeaker driver load impedance the lower the upper cut-off frequency of the amplifier
Some amplifier topologies provide a mechanism to compensate for changes in the amplifier gain with different loudspeaker loads. One of these techniques uses feedback. The amplifier output signal after the interior lowpass is input to the amplifier input for comparison. If not created correctly, this method might cause instability of the amp though. A different approach is to provide dedicated outputs for different speaker driver impedances that are connected to the amplifier power phase through audio transformers.
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