Digital Audio
We live in a digital age. Today´s studios require monitors with the option of a digital input. Because of its unique compactness, the M 52 was a natural candidate for use in digital applications. With many editing suites and audio workstations today, digital output signals are commonplace, so equipping reference monitors with digital input connectors and integrated D/A converters makes sense.

M52 + Digital Input = M 52 D
We took the M 52, expanded upon the existing design, equipped it with switchable inputs for both analog and digital signals in AES3 (AES/EBU), AES3id and S/P-DIF format, and christened the new model the M 52 D. The D/A converter has 24-bit resolution and a sampling rate of 32 - 96 kHz. The analog input is transformer-balanced and floating. A rotary switch on the front panel allows you to select from four sources: the analog input, digital left, digital right, or both digital channels combined.
Power switch, volume control, and the signal selection switch are all conveniently located on the front panel of the compact cabinet. The rear panel hosts an XLR connector which can accept either the analog signal or the AES/EBU digital signal, and a BNC connector for an AES3id or S/P-DIF digital signal, which makes for easy daisy-chaining. Other connectors, including battery input, are located on the back panel.

A Variety of Digital Applications
Magnetic shielding fitted as standard makes the M 52 D is an excellent match for digital audio workstations, or as a control monitor with a digital mixing console or switcher. Compact dimensions of the M 52 D allows for use in many other application areas, such as video editing suites, multimedia projects, surround-sound systems, broadcast vans, and compact rack-mounted systems. In addition, the ability to switch easily between digital and analog inputs means the M 52 D can be implemented wherever a precise control monitor is required.

Astounding Sound
The all-aluminium enclosure offers maximum interior volume. Added rigidity from inner wall bracing ensures an absence of resonant colorations. The 75mm (3") broadband neodymium driver performs remarkably for an enclosure of this size, delivering an accurate, smooth response and low distortion across the entire pass band.
The M 52 D offers the same flexible mounting options as the M 52. The LH 11 desktop stand allows optimal workstation placement and mounting and the MA 19 allows for rack mounting.

Acoustic and mechanical properties are the same as the M 52

	96 kHz digital input on XLR and BNC connectors and analog on XLR
	AES3 (AES/EBU), AES3id and S/P-DIF formats
	Control monitor for direction purposes
	"TV speaker" reference monitor
	Reference monitor for broadcast vans
	Long excursion driver giving low-distortion bass reproduction
	Clear high-frequency reproduction despite compact size
	Convenient volume control on front panel
	Transformer-balanced XLR connector
	DC-connector for use with 12 - 20 V external supplies

Acoustical
Pass band free field frequency response	90 Hz - 20 kHz, ± 5 dB
Self-generated noise level at 10 cm	≤ 20 dB(A)
Max. SPL in half space at 3% THD at 1m	103 dB SPL
Max. SPL averaged between	100 Hz and 6 kHz
Electrical
Woofer amplifier, cont. output power (THD < 0.1%)	24 W
Woofer amplifier, peak output power	40 W
Controller design	Analog, active
Protection circuitry	Thermal
Infrasonic filter frequency; slope	80 Hz; 12 dB/oct.
Input, analog
Impedance, transformer balanced floating	XLR, 10 kΩ
Input sensitivity	+6 dBu
Gain Control	0 ... -Infinite dB
CMRR	> 50 dB @ 15 kHz
Input/Output, digital
XLR, (BNC)	AES/EBU (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	24 Bit AD, Delta Sigma
Digital converter - sampling rate	32 kHz - 96 kHz
Displays, indicators - power on	LED: power on "green", stand by "red"
Mains power	80 - 250 V AC
External power	12 - 20 V DC
Power consumption - idle	7 W; 125 mA
Power consumption - full output AC; DC	50 W; 1.8 A
Mechanical
Cabinet surface	Painted
Color standard	Anthracite (RAL 7021)
Baffle cover	Fixed metal grille
Drivers	Magnetically shielded
Woofer	75 mm (3")
Mounting points	3/8" thread on base, 2 x M6 on sides
Height x width x depth	173 x 120 x 116 mm (6.8" x 4.7" x 4.6")
Net volume internal	1.8 liters
Weight	2,3 kg (5.0 lb)
Accessories	On a floor stand LH 11 On a stand LH 11 On a meter bridge LH 11 On a wall LH 11 Off a ceiling LH 11 In 19" racking MA 19 Other accessories FM 52