33 1 3 turntable12/3/2023 Remember that good result of reproduction on user´s side depends on the quality, technical conditions and correct adjustment of the reproduction facilities! Quality of reading system, the shape, the level of the attrition and the cleanness of the needle and the adjustment of vertical force and antiskating.Low groove speed limits the recording level and causes higher decrease of high frequencies into the middle of the record and higher distortion. If there is no other solution you have to count with a necessary compromise. Try to avoid 7´´ vinyl record format at 33 1/3 rpm as the possibilities of the recording and reproduction are most limited at this format.We always try to transcribe the recording in the highest possible level (as loud as possible).( for example - singing adjusted by variable processors, electronically generated effects etc.) If your recording substantially differs from natural sounds, which is caused by spreading out the energy in the acoustic zone, there is a risk of occurring audible changes in the sound during the transcription as a result of certain limits following from the principles of the mechanical recording and the reproduction.Filter away all subacoustic signals bellow 20 Hz to avoid possible problem during recording and reproduction.The lowest frequencies of the acoustic zone which are bellow 300 Hz have to be in phase.(signal must not contain unreasonably large elements at the bottom and mainly the top end of the zone). Check the master by using a correlation measurer (it must not be in the red field or in negative values) and a frequency spectrum analyser.Try to avoid using psychoacoustic processors in an excessive degree.As the conditions for recording and subsequent reading on vinyl records get worse with the decreasing diameter towards the middle of the record. Try to place demanding exposed tracks at the beginning of the side of the vinyl record not at the end.On the other hand the requirements of extremly high recording level decrease possible playing time (see the table below - for other formats). Try not to exceed the playing lenght of 18 - 20 min per side on 12´´ vinyl record at 33 1/3 rpm as longer playing time leads to dramatic decrease of the recording level and dynamism.Preparing of the suitable master for vinyl record productionįor the best result on vinyl records, you should know the following points before preparing your master tape or CD: Orientation figures for vinyl record playing time: Diameter In such a case the level of the recording must be lowered, or an appropriate compromise must be reached. If the playing time exceeds the figure, it may - but will not necessarily - bring about a situation where the recorded signal cannot be fitted into the available recording area under certain available levels of quality. If the playing time of the recording of one side of a record does not exceed the figure given in the table, the quality of the recording will usually be limited only by the parameters of the recording device and by the conditions in which the reproduction is carried out. The playing time figures which we provide are offered merely as orientation points. The recording time available on vinyl records depends very much on the frequency spectrum, the dynamic range, the width of the stereophonic signal and other characteristics of the recording. *) This record type is manufactured only with a small central hole. 25 cm records are available only in the "standard" weight. In the offering of 17 and 30 cm records, two records weight are available: the "standard" weight and the "heavy" weight. Upon request from customers we can offer recordings on lacquer sheet. ![]() The recording moulds in use at our plant are produced by the DMM technology. Other format combinations were gradually introduced, for instance 30 cm records revolving at 45 rpm for special LP's in which the emphasis is put on sound quality, for special measurement records and for the so-called Maxi-singles in which a short playing time is needed in combination with a high sound quality or 17 cm records revolving at 33 rpm, where the recording cannot be made at 45 rpm because of the required playing time. Initially there were long-playing (LP) records with a 25 cm (10") or 30 cm (12") diameter and a speed of 33 revolutions per minute, and SP and EP records with a 17 cm (7") diameter and a 45 rpm speed. Vinyl records are divided into different categories of size and revolution speed. Their sound parameters and dimensions are set by international standards. ![]() Vinyl phonograph records are sound carriers based on mechanical analogue principle.
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