qualities of KLEIN + HUMMEL studio monitors guides. The O 300 D is a monitor which draws upon all of KLEIN + HUMMEL's years of.Klein-Hummel Monitors O300D + Sub O 800The O 300 D is a monitor which draws upon all of our years of experience in monitor design, which has been fine-tuned View and Download Klein + Hummel 0300 D installation and operation manual online. Active Studio Monitor. 0300 D speakers pdf manual download. Klein and Hummel Telewatt High Fidelity ELA-Entzerrer UE 200 1 Kanal & UE 400 2 Kanal Manual in GermUS $30 Klein + Hummel O300 by Samplephonics. Safety Instructions. It is absolutely essential that you read these safety instructions carefully before connecting and using this K+H product. I am currently using a pair of Klein & Hummel O300D monitors in my studio and have been considering adding the O800 matching sub. My room is a smal. The measurements are based on the Klein + Hummel O 300 D monitor (red curve) measured against an other comparable 2-way-monitor (gray curve) of the same