r7*u E R B A C H + Ass 0 C I ate s .1. The dmamic approach fa\Drs an articulated. tension-structured. acousticallr dampened. electro-mechanical1r driren all sleel ceiling Irith camile\ered side I\alls I\hich store against and pirot out into plaring position from the rear II'all and proscenium Iralls of the stage house. This clearh prorides the onlr acoustical shell I\hich requires no offstage space for storage and the minimal erection and storage requirements of as fell' as t\\'o technical personnel and an elapsed time of .10 minutes. Theatre and Media Facilities Design A 1045 Sansome Sf. San Francisco CA 94111 Tel 415392 7528 Fax 415392 7530 27 West 20th Sf. New York NY 10011 Tel 2126453956 Fax 212 645 4094 IAUERBACH+GlaSOW Lighting Designers and Consultanrs 1045 Sansome Sf. San Francisco CA 94111 Tel 415392 7528 Fax 415392 7530 ;\ HISTORIC PERSPECTJ\'E It is Ilell-knolm among professionals that mr attitude tolrard building budgets and the drnamic approach to theater design-engineel c ing. acoustics and architecture is a lIIodus operandi based on contemporary adaptation of established design and engineering principles which are derired from the three seminal buildings for the performing arts in modern times: * The FestspieUlaus Bayreuth (lS-6). for seating geomellY * The Chicago Auditorium Theater (IS89). for Uleater engineering * Boston Sll11phonr Hall (1900). for acoustical geomelI~' In mr rielI'. common sense reasoning dictates that the "open loop" BaITeuth stde of democratic auditorium design is the preferred renue. I reject out of hand the "closed loop" socially-stratified auditorium of the ISth centun High Baroque and the 19th centurr "eo Baroque as incompatible to the design and least favorable to engineering fle\.ibility. This veil' reasoning casts the economic realities of the "here and nOlI''' into ever-higher relief. T HE BASIS FOR Lr\X-\~IIC THEXITR DESIG;\ .-\;\[) E;\GI;\EERI;\C Traditionally. an auditorium is a double-structured bUilding..-\ massire primarr e\terior structure prorides both weather corering and support for a more fragile secondal~' interior substructure. The design and engineering of the substructure and the interrelationship belIreen the primarr structure and substructure are e\er-changing in the traditional design .12 \ I TD&T process. primarily due to budgetarr constraims. In a static approach to theater design. the discussion of the substructure is reduced to a matter of pure architecllIral consideration Irhich either ignores the seating. rolumetric and acoustic dl'llamics of the auditorium altogether. or. Irith professional help in acoustics. limits the drnamic aspect of theater design to alteration of the re\erberation time alone. But the substrucllIre cannot be reduced thuslr. It must be regarded comprehensirelr and an understanding of this interrelation is of crucial importance in this consultant's dynamic approach to the design of the multipleuse concert hall-theater..-\ closer look at the evolution of the engineering vernacular speaks rolumes about technology. changing times and our economr. In the beginning. dmamic control of auditorium rolume. seating capacitr and the acoustical ambiance thereof II'as achieved br means of programmed electro-mechanicaLly driven and coumenreighted substrucllIres. i.e. first reflectire ceilings articulated Irith programmed absorption. etc. and Irere emplored in the theater engineering design at Jesse Jones Hall (1966). 1IIcCain .-\uditorium at Kansas State lnirersity (1971) and Akron lni\'ersi~'s Edwin Thomas Hall (19-3). As time Irent on and budgets became erer more precarious. these substructures became both less massire and less comprehensive. Aminimum of permanently moumed first reflectors articulated Irith primarr structure were accompanied bl' a rariet\' of morable trans-sondanl risual barriers I\ith programmed absorption positioned in an upper \Did rererberation chamber). E\amples of this later dmamic approach to theater design include the George 1IIason Performing Arts Center in Fairf;L\. Yirginia (1991) and the \'ern Riffe Center for the Performing Arts at Shalmee State lnirersitr in Portsmouth. Ohio (1996). Without e\ception. each of these projects Iras programmed for raning combinations of spoken drama. the performance of classical music for concert and recital. jazz. musical comedr. opera. ballet. modern dance. cinema. multimedia. public fora. lectures. etc. ...dilĀ·erse programming requirements to be sure. Each design successhIlI\ resulted from ingenioush applied but conselyatilehengineered automated first reflection acoustical sub-structures of one kind or another and/or trans-sondam risual barriers used in