Back in 1967, Klein + Hummel launched the world’s first active multi-channel studio monitor, the OY. The O 410 represents the latest incarnation of the many technologies pioneered by Klein + Hummel during the intervening 40 years. Engineering excellence applied to all aspects of the O 410 design brings a new benchmark in audio reproduction quality. A waveguide featuring Mathematically Modeled Dispersion™ (MMD™), flexible acoustical controls, various input options, and an extensive mounting hardware range allow the O 410 to be used in diverse acoustical conditions, with any source equipment, and in a wide variety of physical locations.
The O 410 has been designed for use as a mid-field or main monitor. It is particularly well-suited for use in music, broadcast, and post production studios for tracking, mixing, and mastering. The O 410 can be used free-standing or flush mounted into a wall, and, in multichannel systems, can be mixed freely with other loudspeakers in the Klein + Hummel range.

Mid Sized 3-way System

	The most important part of the frequency spectrum is reproduced by a separate midrange driver
	Extremely low harmonic and intermodulation distortion results in clean sounding audio reproduction
	Exceptionally neutral sound stage from 30 Hz to 24 kHz (±3 dB)
	Ideal cabinet materials with excellent self-damping properties
	Structural resonances avoided using LRIM™ (Low Resonance Integral Molding™)
	Vented enclosure extends bass response, even at very high output
	Modern-looking design with optional grille
	Extensive accessories allow for a multitude of installation possibilities
	Magnetically shielded for use next to CRT screens

Mathematically Modeled Dispersion™ (MMD™)

	Three stage design process:   Waveguide is mathematically modeled before physical prototypes are realized,    Physical prototypes are measured under anechoic conditions to verify theoretical performance,   Extensive listening tests correlate objective measurements and subjective perception
	Wide horizontal directivity gives increased freedom of movement along the mixing console
	Narrow vertical directivity reduces the effect of early reflections off the console surface
	MMD™ is easily rotated in the field when horizontal mounting the cabinet
	Perfect directivity pattern leads to a smooth power response

Advanced Electronics

	Transformer balanced input stage (TIM 1) equipped with special distortion reduction crossover function
	Q 16...24-Bit, 20...216 kHz digital input stage (DIM 1) for AES3, AES 3id and S/P-DIF signals
	Q Electronics can be remotely accessed when the cabinet is flush mounted (REK 1 and CP 2, CP 5, CP 10, CP 15, CP 20, CP 25, or CP 30)
	Integrated electronic limiter for each driver

	Hybrid class A-B amplifiers, employed for their best overall performance, are also protected
	Active three-way crossover with 24 dB/oct. slopes
	Input options give flexibility without burdening basic product:   Transformer balanced input stage equipped with special distortion reduction crossover function,    16…24-bit, 20…216 kHz digital input stage for AES3, AES 3id and S/P-DIF signals,    XLR and BNC inputs, and a BNC output for flexible and robust interconnectivity
	Display for signal type, protect, and digital status is integrated into the MMD™, together with a K+H logo
	Controls adapt the monitor’s response to compensate for the loudspeaker’s environment:   Bass, mid and treble controls for specific and common acoustical issues,    Parametric EQ for low-frequency corrections
	Accelerated Heat Tunneling™ (AHT™) ensures effective amplifier cooling whether the cabinet is mounted vertically or horizontally.
	Electronics can be remotely accessed when the cabinet is flush mounted
	Electronics can be remotely powered on with two modes of operation (0 V and 12 V trigger)
	Attention to detail in design results in low self-generated noise

Acoustical
-3 dB free field frequency response	30 Hz - 24 kHz, ± 3 dB
Pass band free field frequency response	32 Hz - 20 kHz, ± 2 dB
Self generated noise level at 10 cm	< 25 dB(A)
THD < 0,5% at 1 m distance from	95 dB SPL (> 100 Hz)
Max. SPL in half space at 3% THD in 1m	120.0 db SPL
Max. SPL averaged between	100 Hz and 6 kHz
Electrical
Woofer amplifier, cont. output power (THD < 0.1%)	340 W
Woofer amplifier, peak output power	400 W
Midrange amplifier, cont. output power (THD < 0.1%)	160 W
Midrange amplifier, peak output power	190 W
Tweeter amplifier, cont. output power (THD < 0.1%)	180 W
Tweeter amplifier, peak output power	210 W
Controller design	Analog, active
Crossover - Frequency	600 Hz / 2.0 kHz
Crossover - Slope	24 dB/oct
Equalization - Bass	0; -2.5; -5; -7.5 dB
Equalization - Mid	0; -1,5; -3; -4,5 dB
Equalization - High	1; 0; -1; -2 dB
Parametric Equalizer	Bypassable
Parametric Equalizer - Gain	+4 ... -12 dB
Parametric Equalizer - Frequency	20 ... 200 Hz
Parametric Equalizer - Q	1 ... 8
Protection circuitry	Limiter: low, mid, high
Substronic filter: frequency/slope	15 Hz; 12 dB/oct
Input, analog
Impedance, electr. symm.	XLR, 13 kΩ
Impedance, bal. floating	XLR, 4.7 kΩ*
Input sensitivity	-8 dBu/+6 dBu
Gain Control	-9 ... +6 dB
CMRR	> 60 dB @ 15 kHz
In-/Output, digital
XLR, (BNC)	AES3 (AES3id, S/P-DIF)*
Impedance XLR	110 Ω, balanced floating*
Impedance BNC	75 Ω, non symmetrical*
Input switching	Analog/digital* - left/mono/right*
Digital converter - resolution, design	16 ... 24 Bit DA, Delta Sigma*
Digital converter - sampling rate	20 kHz ... 216 kHz (SRC)*
Displays, indicators - power on	K + H logo "red"
Displays, indicators - limit / clip / signal	Protect / digital / analog
Mains	100, 120, 230 V AC swichable
Power consumption - idle	36 VA
Power consumption - full output AC; DC	1.300 VA
Mechanical
Cabinet surface	Painted
Color standard	Anthracite (RAL 7021), silver (RAL 9006)
Baffle cover	Optional metal grille, removable
Drivers	Magnetically shielded
Woofer	265 mm (10")
Midrange	76 mm (3")
Tweeter	25 mm (1")
Mounting points	8 x M5 on rear
Height x width x depth	645 x 330 x 444 mm (25 3/8" x 1" x 17 1/2")
Net volume internal	42 liters
Weight	36 kg (79.4 lbs)
Accessories	On a floor stand LH 41 + LH 28, LH 41 + LH 28 + LH 36, LH 41 + LH 29, LH 41 + LH 36 + LH 29 On a subwoofer LH 41 + LH 37, LH 41 + LH 36 + LH 37 On a wall LH 42 + LH 45, LH 44 + LH 45 Off a ceiling LH 42, LH 42 + LH 43, LH 44, LH 44 + LH 43 Off a lighting or truss bar LH 42 + LH 29, LH 44 + LH 29 Other accessories TIM 1, DIM 1, REK 1, GO 410 B, GO 410 S, FO 410, CP 2, CP 5, CP 10, CP 15, CP 20, CP 25, CP 30

*user fitable option

Active Studio Monitor O 410
Three-way active loudspeaker system powered with 340 / 160 / 180 watts RMS amplifiers. 1" tweeter, 3" midrange dome, 10" cone woofer, MMD™ waveguide, painted LRIM™ enclosure, drivers are magnetically shielded. Max. SPL 120 dB at 1 m. XLR electronic balanced input, optional transformer balanced input and optional 16…24-bit, 20…216 kHz digital input. Free-field frequency response 32 Hz - 24 kHz, ± 3 dB. Eto compensation for room acoustics consists of: bass, midrange, treble and one parametric equalizer stage. Self-generated noise ≤5 dB(A) at 1 m. Dimensions 330 mm wide (13") by 645 mm tall (25 3/8") by 480 mm deep (19 7/8"), weight 36 kg (79.4 lb).