A type of simple audio shelf equaliser or bass/treble tone control invented by English electronics engineer Peter Baxandall (1921-1995). 

In hi-fi equipment 'tone controls' typically refers to bass and treble shelf equalisers, often using the Baxandall design. it may also refer to a low-pass filter in guitars and other electronic instruments. 

A simplistic definition would be type of filter design where the frequencies are delayed by the least possible amount in their passage through the filter, but some frequencies will acquite greater phase shifts than others. Most analogue filters us

Pre-ringing refers to an inherent character of the impulse response of linear-phase filters employed in D-A or A-D converters. In a conventional analogue or minimum phase filter, an input impulse signal will generate an output impulse response with a strong initial spike followed by a string of ripples of decrasing magnitude. In a linear-phase filter the impulse spike is preceded by a build-up of ripples in advance of the impulse arriving, and a symmetrical string of decaying ripples afterwards.

A type of filter design where the phase response is a linear function of frequency. In other words, all frequencies are delayed in their passage through the filter by exactly the same amount.

A word is a unit or block of data employed in a computer. A typical word length is 8-bits and normally called a byte. 

A word is a unit or block of data employed in a computer, and so the word-length defines the number of bits employed in each word. A word length of 8-bits is normally called a byte. The CD format uses a word-length of 16 bits, but more modern systems typically use a 24-bit wordlength.

A form of acoustic panel employed in the acoustic treatment of a room which reflects incident sound in specific ways with the aim of maintaining an even spread of sound energy withint he environment. (More)

Diffusion is the spreading of sound energy within an acoustic environment. It the context of acoustic treatment diffusion can be thought of as the opposite of absorbtion, and a range of diffusion panels and surfaces are available which are designed to reflect incident sound back into the room in various ways.

Used in the context of filters and equalisers, the term refers to the gradient or steepness of the change in signal amplitude at the turnover frequency. First-order filters have a slope of 6dB/octave, while second-order is 12dB/octave and third-order is 18dB/octave. The steepest slope typically found in audio filters (ususally in synthesizers and loudspeaker crossovers) is 24dB/Octave (fourth-order). Shelf equalisers normally have 6dB/octave slopes.