Gator GK76 Slim Lightweight Keyboard Case w/ Wheels Cow Bells you get a bigger frequency

you get a bigger frequency response down to 40 Hz

Vienna Instruments - Appassionata Strings II from the Vienna Symphonic Library is a sample-based virtual instrument

IEC inlet and detachable power cord

20Hz - 25kHz +/-2

And finally

Gator GK76 Slim Lightweight Keyboard Case w/ Wheels Cow Bells you get a bigger frequencyFEATURES: Rigid EPS Foam Lightweight Case w Wheels for Slim 76 Note Keyboards Rugged nylon construction with polyethylene reinforced interior frame Interior is lined with Tricot & soft foam Fully adjustable padded straps to secure keyboard in place during transport Large accessory compartments on outside for pedals and cables Built in wheels with tow handle & skid bars Color: Black Handles: 2 Webbed Nylon, 1 Tow Latches: Zipper IDEAL CASE FOR THE