amplifier shoulder sling bags 1.Favorable price 2.Any colors and size are available 3.Quick delivery 1, Product Information: Product Name: amplifier shoulder sling bagsFabric: 600DSize: 45*32*11 cm, also to be customizedLogo Options: Silk Screen Printing ; Emboidary ; Rubber patch, etc...Parameters:Speaker diameter:57mmAUX input impedance:10-20KΩ output impedance:4ΩFrequency range:80Hz-20 ...