BBC Monograph 68: Recent Research on Studio Sound Problems. D.K. Jones, H.D. Harwood.
Topics: cone, bbc, microphone, subjects, preference, balance, surround, frequency, table, preferences,...
R&D Report 1954-13 : The Klein-Plessey Ionophone loudspeaker. J.R. Chew A novel type of loudspeaker, known as an "Ionophone", has been tested. In this loudspeaker the conventional vibrating diaphragm is dispensed with and the sound is produced by a modulated r.f. corona discharge. The device is used in conjunction with a horn radiator and its main field of application is therefore in the high-frequency range; smooth response can be obtained up to at least 20 kc/s. In its present...
Topics: frequency, ionophone, horn, distortion, output, tuning, loudspeaker, axial, corona, overload,...
R&D Report 1954-32 : The Labor Tube microphone Type MD3 Studio. W.I. Manson, J. Nash The Labour type MD 3 Studio microphone is a moving-coil instrument in which the sound is transmitted to the diaphragm through a telescopic tube several feet long; the microphone is used occasionally for special purposes in television transmissions. Measurements of frequency response, sensitivity, impedance and susceptibility to interference from alternating magnetic fields have been made on a single...
Topics: microphone, frequency, tube, labor, axial, studio, baffle, response, telescopic, impedance, labor...
R&D Report 1955-08 : The Robbins-Joseph (R-J) loudspeaker enclosure. D.E.L. Shorter, H.D. Harwood, R.J. Packer Tests have been carried out on a small loudspeaker cabinet known as the "R-J enclosure" which has been claimed to give improved bass reproduction. A small increase in efficiency at low frequencies resulting from the particular form of construction adopted is accompanied by some reduction of response in other parts of the frequency range.
Topics: enclosure, response, loudspeaker, frequency, vent, impedance, enclosures, cone, axial, frequencies,...
R&D Report 1956-01 : The Philips moving-coil microphone Type EL.6040. W.I. Manson Laboratory tests have been carried out on two specimens of the Philips microphone type EL.6040. Measurements of frequency response, sensitivity, impedance and interference from magnetic fields have been made. The microphone has also been tested in the parabolic reflector PRB/2.
Topics: microphone, frequency, ohms, response, ohm, impedance, specimen, output, parabolic, philips,...
R&D Report 1956-03 : The Ronette crystal microphone cartridge Type MC.65. W.I. Manson, D.E.L. Shorter The report gives tests results on three samples of the Ronette diaphragm-type crystal microphone cartridge MC.65. The performance varies considerably between individual specimens but is on the average superior to that of earlier microphone of this kind.
Topics: microphone, ronette, frequency, crystal, cartridge, specimens, response, specimen, axial, noise,...
R&D Report 1961-12 : AKG electrostatic microphones Types C26 and C28. H.D. Harwood, J.R. Chew, R.L. Deane, R.J. Packer This report describes tests on two electrostatic microphones manufactured by the Akustische und Kino-Gerate Gesellschaft (A.K.G.). The first, type C26, has omnidirectional and the second, type C28, cardioid characteristics. The microphones are of small dimensions and provision is made in each case for introducing an extension piece between the capsule and the head...
Topics: type, microphone, capsule, extension, interference, impedance, characteristics, frequency, noise,...
R&D Report 1962-41 : The Sennheiser Type MD 82 and Electrovoice Type 642 microphones. W.I. Manson The Sennheiser type MD 82 and Electrovoice type 642 are both directional microphones in which sound is received through openings along a narrow tube. Type MD 82, a number of which are in use in the Corporation, is no longer in regular production but is included in this report for comparison with the currently available type 642. Measured frequency characteristics and polar patterns are given.
Topics: type, microphone, frequency, microphones, directivity, electrovoice, impedance, bass, sennheiser,...
R&D Report 1966-22 : The Standard Telephones and Cables Type 4126 microphone. H.D. Harwood This report describes tests on five samples of the type 4126 capacitor microphone made by Standard Telephone and Cables Ltd. It is a miniature version of the type 4108 instrument but employs a field-effect transistor instead of a valve in the head amplifier. Power is supplied by means of long-life batteries in a small case which may be situated up to 100 ft (30m) from the microphone. The frequency...
Topics: frequency, microphone, type, microphones, characteristics, axial, specimen, impedance, specimens,...
R&D Report 1966-28 : The design of a low-frequency unit for monitoring loudspeakers. H.D. Harwood The present state in the design of low-frequency loudspeaker units is reviewed and the areas where improvement is desired are indicated. Experimental details are given leading to the design of 12 in. (305 mm) unit incorporating a vacuum-formed cone of toughened polystyrene with a p.v.c. (poly-vinyl chloride) surround and it is shown by objective and by listening tests that this design is...
Topics: cone, frequency, surround, mould, unit, shape, characteristic, axial, goodmans, loudspeakers,...
R&D Report 1967-57 : The design of studio monitoring loudspeakers Types LS5/5 and LS5/6 H.D. Harwood, S.A. Hughes Details are given of the various factors which have led to the design of two new monitoring loudspeakers suitable for use in studios and outside broadcasts. The loudspeakers are much smaller than those of the present type; a floor standing model is designated type LS5/5, and one intended for hanging is called type LS5/6. In the course of the design, the questions of bass...
Topics: frequency, unit, loudspeaker, slit, axial, type, bass, khz, loudspeakers, characteristics, axial...
