By Ben Duncan
Continual amplifiers and their functionality lie on the middle of audio engineering and supply a few difficult difficulties for the engineer. Ben Duncan's event, as an audio advisor, analog electronics dressmaker and writer, provide him an exact perception into this hard yet lucrative box. Linking analog electronics, acoustics, warmth and tune expertise; high-end hi-fi PA and recording studio use; thought, modelling and real-world perform; layout and service; the outdated and the recent, the mainstream and the specialized, this finished consultant to strength amps is a center reference for someone within the undefined, and any onlookers. Ben Duncan is celebrated to many clients of audio energy amplifiers worldwide, either specialist and household, via his articles, studies and examine papers on song know-how within the united kingdom and US press, and during his half in developing a number of awesome specialist strength amplifiers. for the reason that 1977, he has been fascinated by the layout of over 70 cutting edge, high-end audio items utilized by recording and broadcast studios, on levels, in golf equipment and by means of the main severe household listeners - in addition to growing bespoke gear for prime musicians. Born in London, he has travelled generally yet has lived ordinarily in Lincolnshire, domestic of his relatives for over a hundred and fifty years. he's two times co-author of the publication Rock during which he has chronicled the heritage of rock'n'roll PA. Reprinted with corrections September 1997
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Extra resources for High Performance Audio Power Amplifiers for Music Performance and Reproduction
V) the ease and capability of creating highly conjugate, highly matched and closely toleranced crossover functions. Of these, the low-level passive crossover potentially has all the same advantages – except possibly this last item. Active manifestations Active crossovers commonly take one of three forms. In pro-audio ‘the crossover’ is commonly used packaged in its own box, like other signal processors, as a standalone. 2 Loudspeakers As a power amplifier presents a (literally) well placed opportunity to share a box and a power supply, a few power amp makers offer a pluggable option or ‘octal socket’, where a crossover module or card can be retrofitted.
The Motorola piezo element cannot be ‘burned out’ by too much ‘power’ as it presents a high impedance. But it is rated at about 25v rms, and excess voltage will quickly destroy the crystal. The crystal can even be harmed by room heating. For use with amplifiers having headroom above 25v rms, operating 2 or 3 in series is suggested. This should not degrade damping as it would with a low impedance speaker. 2 Loudspeakers Inductive coupling Eli Boaz at Goodmans, part of the TGI Group (comprising speaker manufacturers Tannoy, Goodmans and Martin Audio in the UK) spearheaded the development of 2-way drive-units where the hf driver is inductively coupled (Inductive Coupling Technology or ICT).
This is often a low-budget option limited to installation work, but while it can save money, it need not be shoddy. If carried out with as much care as any crossover is due, turning an amplifier into a ‘speaker-driving filter’ has the advantage of minimising superfluous hardware and signal path complexity. Otherwise, the active crossover along with the power amplifiers, is placed in the loudspeaker enclosure. This creates an ‘active enclosure’, ‘active speaker’ or ‘Triamp cab’ (if 3 way; else ‘Bi-amped-’, ‘Quad-amped-cab’, etc) that has the advantage of hiding the complexity, and offers a fait accompli, but takes away the flexibility that touring PA users often need.