All ALSPAW stage roofscan be extended with sound wings. These are additional towers, connected with roof’s sleeve blocks. They are mostly used to hang line array speakers. You can also hang small LED screens. Sound wings have construction similar to stage roofs from which they are extended - towers HD3 290-Q, HD3 390-Q or HD4 390-Q, horizontal trusses HD3 290-Q, HD3 390-Q, HD4 390-Q or HD4 600x400-Q. Standard width is 3 meters.