PART VIII Recording Studios SUMMARY In the majority of cases, the presence of daylight in a studio is a desirable asset. Cho0ice of artificial lighting should be made carefully, so as not to risk compromising the electro- acoustic performance of a studio. Variable transformers tend to be the best form of lighting control. Good ventilation, air-conditioning and humidity control is usually essential. Extraction-only ventilation systems should not be used. There has been a great increase in the number of split air- conditioning units being used in studios. These are not ideal, but if they must be used, the quietest, aerodynamically profiled ones should be chosen. Foldback systems are very much part of the studio environment for the musicians, and the necessity of seeking the most appropriate systems for the musicians' needs should not be neglected. Colors and general decoration are a very important part of a studio environment, but interior design should never be allowed to degrade or limit the work of the acoustic designer. Studio power wiring needs are often beyond the experience of normal electrical contractors. Specialist advice may be needed. When any non-standard installation is completed, documentation should be thorough, and avail- able for consultation by any electrical contractors who may do work in the studio in the future. Electrical regulations can change from country to country, and even from state to state or region to