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O 300 - Active Studio Monitor
Discontinued, Production from 2007 until 2013
Follow-up model is KH 310 A
General Description

The goal: accurate, absolutely uncolored sound
Our aim with the O 300 was to strive for nothing less than perfection in developing the best compact active reference monitor possible, with accurate, uncolored sound, superb transient response, and ideally shaped waveguides.

The Differences: O 300 D O 300
Analogue Input Transformer Balanced Electronically Balanced
Digital Input S/P-DIF, AES/EBU None
Amplifier Direct Input Yes None

The O 300 is a monitor which draws upon all of our years of experience in monitor design, which has been fine-tuned through extensive computer simulations and countless listening tests. It is indeed unique in its class, for it does in fact deliver superlative sound absent of colorations, precise bass response, picture-perfect dispersion patterns, and a stunningly real soundstage with remarkable image focus and depth.

The advantages of the three-way system
To authentically re-create the sound captured in a recording-particularly a recording of the human voice-an active three-way system was chosen. In comparison with two-way monitors, the 300 offers clear advantages that have been discussed in detail earlier in this catalog. The sophisticated three-way design employed in the O 300 makes this loudspeaker system extremely precise and revealing of detail, and it enables the mixing engineer to make critical judgments with supreme confidence.

Exact localization and extraordinary sense of space
By utilising a dense, new, extremely low-resonance material called LRIM, we were able to mold the waveguides required for optimal dispersion directly into the baffle. The elliptical shape of the high-frequency horn makes the dispersion angle in the vertical plane more narrow thus reducing the amount of early reflections off the console surface which would otherwise interfere with the direct sound from the speakers (comb-filter effects), thereby improving spatial definition. At the same time, the effective horizontal listening area is made wider, giving the recording engineer greater freedom of movement in front of the console. The use of LRIM has also made it possible to align the acoustic centers of the two drivers exactly on one plane, parallel to the baffle, thereby preventing time and phase coherency problems at the crossover frequencies. This allows the individual drivers to work together perfectly to produce a precisely detailed soundstage.

Superb sonic qualities
For a loudspeaker system to achieve extremely flat frequency response and create an authentic reproduction of the original sound, its components need to be of very high quality, carefully manufactured, and selected for their compatibility with one another.
The 8¼” (210 mm) cone woofer is made of a special lightweight polypropylene material that has excellent self-damping properties. Its long-excursion voice coil enables this driver to produce very low frequencies at high sound pressure levels with practically no distortion. In contrast to common bass-reflex systems, which tend to blur the low end, the acoustic suspension system of the O 300 D delivers tight, articulate bass which is strikingly clear, detailed, and natural, particularly in transients.
The midrange is handled by a treated fabric dome with a diaphragm/voice coil of 3" (76 mm) in diameter. Since its mass is much lower than that of cone drivers, it has the advantage of being able to achieve superior impulse response and extremely uniform amplitude response. As a result, midrange reproduction is impressively true-to-life, especially with the human voice.
The high-frequency driver is equipped with a titanium/fabric dome that combines the transparency of a titanium dome with the low distortion of a fabric dome. This driver has been finely matched to its elliptical waveguide, ensuring exceptional directivity.
All three drivers are magnetically shielded, allowing you to place the speakers directly next to video monitors or computers.

Precise room-matching
The O 300 includes very flexible room-matching circuitry to alter the amplitude response of the monitor as needed, depending on speaker placement, in multiple steps and in three critically relevant frequency ranges. This flexibility can be instrumental in turning less than ideal room acoustics into a favorable listening environment.

High-performance amplification
Each of the three drivers in the O 300 is powered by a high-performance amplifier that is exactly matched to the driver’s technical requirements and which embodies our long years of audio experience. Precisely tuned electronic crossovers help provide proverbial operational reliability and high amplifier output with minimal distortion.
The monitor is equipped with effective protection circuitry designed to allow impulse peaks through and to respond with limiting only when a voice coil is in danger of thermal overload or a power amplifier runs the risk of overheating. Activation of the limiter is indicated by blinking of the illuminated logo.

Solid enclosure, award-winning design
The monitor stands out not only for its sound but also for its attractive, modern design, and in fact received an international design award in 1998. The sides of the cabinet are constructed of low-resonance wood, and the front baffle is molded of dense LRIM. The cabinet is available in either a charcoal-gray enamel finish or any other RAL color. The attractive metal grille is the final touch.

Block Diagram (Download)


Sophisticated 3-way system
 The most important frequency spectrum lies in the ideal broadcast zone of the loudspeaker
 Extremely low-distortion reproduction
 Exceptionally neutral sound stage from 40 Hz to 20 kHz
 No standing waves in enclosure
 No partial coloration
 No comb-filter effect

Unconventional enclosure concept
 Very compact enclosure constructed of advanced materials
 Avoidance of resonance via combination of MDF and LRIM (Low Resonance Integral Moulding)
 Very accurate bass reproduction via sealed enclosure
 Precision centers of loudspeaker are on one plane
 Homogenous baffle with no diffraction or fastening elements and with excellent self-damping properties
 Extremely wide effective listening area for main monitor via horizontal installation
 Modern design
 Numerous installation possibilities
 Optional baffle cover/grill
 Magnetically shielded

Functional waveguide
 Dispersion is horizontally wide
 Increased freedom of movement at mixing console
 Vertically narrow sound dispersion reducing early reflections off console surface
 Perfect dispersion pattern

Advanced electronics
 Integrated electronic limiter for each driver
 Active crossover equalizer with 24 dB/oct.
 AF-input equipped with minimal distortion input circuit
 Power and overload/limiter-display integrated into logo
 3 x 4 room-matching circuitry for different placement options

Delivery Includes
 1x O 300
 1x Power cord
 1x Operation manual
 K+H O 300 Front View

     K+H O 300 Front View (Version: silver), Rear View

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