Klein & Hummel O300 – 3-Way Active Studio Monitors
Used – Excellent working condition
For sale are the legendary Klein & Hummel O300, one of the most acclaimed professional three-way active monitors, known for their exceptional accuracy, natural performance and excellent translation in mixes.
The sound works flawlessly, without any problems whatsoever.
The sale includes:
✅ The original double-walled boxes
✅ The original manuals
✅ The factory power cables
✅ The original receipt of purchase from Naka
⭐ Why the O300 stand out
True 3-way design with independent drivers for low, mid and high frequencies.
Extremely flat and neutral frequency response.
Ideal for mixing, mastering and demanding productions.
Excellent stereo image and depth.
Very low distortion.
One of the most acclaimed monitors in professional studios and broadcast facilities around the world.
Usage History
The monitors were used exclusively in a private, non-smoking studio and always with special care.
They were never operated at levels above 87 dB SPL.
They were always paired with a separate 12" subwoofer, so they were never stressed at very low frequencies.
The woofer surrounds were preventively maintained once a year with a special silicone spray, so that they would maintain their elasticity and proper behavior over time.
The cabinets, speakers and amplifiers are in excellent condition.
O300 and Neumann KH310
The Klein & Hummel O300 is the direct predecessor of the Neumann KH310 and is based on the same design philosophy.
Many professional sound engineers still prefer the O300 for:
the particularly natural midrange frequencies,
the more "musical" character,
the excellent translation of the mix to other playback systems.
Even today it is considered a reference point and is worth comparing with modern high-end studio monitors.
💡 These O300s are now difficult to find in such a neat condition, complete with the original boxes, manuals and proof of purchase.