The VM Series, from our line of “confidence plus” audio monitors are very compact and light, digital and analog audio monitors at very cost effective prices. The single-rack space monitors offer excellent fullrange fidelity far exceeding that of competitive units. Two front-firing midrange tweeter speakers and a compact high-performance woofer are arranged in Wohler Technologies’ popular bi-amp design. All Wohler speaker systems are protected against blowout by limiters.The summed bass feature is important for audible detection of “out of phase” conditions.

Electronic rather than acoustic cancellation of bass frequencies provides positive audible detection of outof-phase (reversed polarity) audio feeds. The units feature 2 ten-segment VU LED bar graph level meters. Fast and averaging “phase” LEDs give visual alert of “out of phase” conditions. A three-way toggle switch selects between the analog or digital inputs. Muting may also be activated from a switch remote from the rear panel (optional extra). An auxiliary analog output of the selected analog or digital source is provided on the rear panel.

The VM Series monitors are completely magnetically shielded to allow interference-free operation immediately adjacent to all CRT video monitors. The light weight and shallow depth chassis compared to similar type units, make them ideal for use in portable and mobile vehicle applications.

Features• Only 1RU• Powerful 96dB SPL at 2 feet (0.6m)• 2 10-segment VU level meters• Phase /polarity indication• Converts 110 W balanced AES (Phoenix) to/from 75 W unblanced AES (BNC)• Headphone jack mutes speakers• Blowout-proof speakers

Benefits• Thorough magnetic shielding allows placement next to video monitors.• Select from analog or digital sources.

VMMDA-1 and VMDA-4

VMMDA-12-channel HD/SD-SDI, AES and analog monitor with metering and SDI sub-group selector.

VMDA-42-channel AES and 8-channel analog audio monitor with metering that either selects 1 of 4 AES or analog pairs, or sums any of the 4 analog pairs

AESA HDSDI

2-Channel Audio Monitors

Order Part NumbersVMMDA-4: 8113-0050 (Analog, AES/EBU, HD/SD-SDI)VMDA-1: 8111-0040 (Analog, AES/EBU)

Tel +1-510-870-0810

www.Wohler.com+1-510-870-0811Fax

TechnologiesWohlerLEFT

RIGHT

OUTPUTANALOG

LOHI

AES 1SDI IN

253234-01

LOHI

AES 1

TERM.

ANALOG INPUT

LEFT

RIGHT

HI

LO

SDI OUT

RS232

50/60 Hz 1.0 A100-240 VAC

SERIAL NO. MONTH

YEAR

WohlerTechnologies

+1-510-870-0810+1-510-870-0811

www.Wohler.comFaxTel

VMDA-4

RIGHT

253890-01

LEFT

ANALOGOUTPUT

ANALOG INPUT

LO

AES 1

HI

LO

AES 3

HI

AES 2

AES 1TERM. 1

AES 2TERM. 2

AES 4

LOHI

HI

HI

LO LO

AES 3TERM. 3TERM. 3

AES 4TERM. 4TERM. 4

1 2 3

RIGHT

LOHI

LEFT

4

HI

LO

100-240 VAC50/60 Hz 1.0 A

SERIAL NO.

MONTH YEARMADE IN U.S.A.

Rear Panels

sales@wohler.com www.wohler.comBASEBAND STREAM FILE BASEBAND STREAM FILE

VMMDA-1

VMDA-4

VMMDA-1 Block Diagram

Specifications VMMDA-1 VMDA-4Dimensions (H x W x D) 1RU in standard 19” rack: 1.75” x 19” x 10”

(44.5 mm x 483 mm x 254 mm)1RU in standard 19” rack: 1.75” x 19” x 9.0” (44.5 mm x 483 mm x 246 mm)

Shipping Weight / Net Weight 13 lbs (5.90 kg) 10 lbs (4.50 kg)

Power Requirements Power to the unit is 100 to 240 VAC ± 10%, 50/60Hz.

Supplied Accessories AC power cord

Inputs 2 balanced analog: (mini Phoenix)1 AES: (mini Phoenix/BNC)1 SD/HD-SDI (BNC)

8 balanced analog (mini Phoenix)4 AES (mini Phoenix/BNC)

Outputs 2 selected analog (mini Phoenix)1 re-clocked SDI (BNC)

2 selected analog (mini Phoenix)

Analog Input Impedance >100k W balanced

AES Input Impedance AES 75 W Unbalanced and 110 W Balanced

Digital Input Sampling Rate 32 to 48 kHz, auto-sensing

Hum and Noise Better than -70 dB below full output

Electrical Distortion Less than 0.3% at any level below limiting threshold

Acoustic Distortion Typically < 2% at any level below limiting, 100 Hz-15 KHz

View the complete list of specifications online at wohler.com

Part Number 830037, Revision B

VMMDA-1 and VMDA-42-Channel Audio Monitors

Input (1-2)

Input (Unbal.)

Input (Bal.)

InputHD/SD-SDI

Analog

AES

OutputAnalog Stereo

Output of Selected Source

Analog to Digital

Converter

D to AConverter

AESReceiver

Left Speaker

Stereo Analog Ampli�er

Volume Balance

WooferSpeaker

Phase IndicationRight Speaker

Headphone10-SegmentLevel Meters

ANA

AESSDI

Analog/Digital/Mute Select

Re-Clock

G1-1,2G1-3,4G2-1,2G2-3,4G3-1,2G3-3,4G4-1,2G4-3,4

Group/SubgroupSelect

SDI to AES

De-Embed

SDIDecoder

1

Analog StereoInputs

(1-4)

AESReceiver

Analog to Digital

Converter

Analog/Digital/Mute Select

D to AConverter

Left Speaker

Stereo Analog Ampli�er

Volume Balance

WooferSpeaker

Phase IndicationRight Speaker

Headphone

10-SegmentLevel Meters

AM

D

2

3

4

1

2

3

4

A

D

A

D

A

D

Channel Select

(AES = 1 of 4 Stereo Pairs Only)

(Analog = Sum 1-4 Stereo Pairs to L/R)

Left

Right

1 2

3 4

12

34

M

M

MAnalog Stereo

Output of Selected Source

AESInputs

(Unbal.)

AESInputs(Bal.)

VMDA-4 Block Diagram

Wohler Technologies, Inc.Worldwide Headquarters31055 Huntwood AvenueHayward, CA 94544 USAPhone: +1 510 870 0810Email: sales@wohler.com

Wohler Technologies/APAC45/F, The Lee Gardens33 Hysan AvenueCauseway Bay, Hong KongPhone: +852 3180 2240 Email: sales@wohler.com

Wohler Technologies/EMEASuite 3, Medaxon House Mill Mead, Staines TW18 4UQ, UKPhone: +44 (0) 1784 779815 Email: sales@wohler.com

Infinite Possibilities. One Wohler.