World Leader of In-Rack, Audio, Video, Data Monitoring, and Closed Captioning Solutions
CONFIDENCE IS EVERYTHING.™
SUM Series
• AMP1A SUM6/RD
• VMDA-SUM8
1RU Summing Audio Monitors
User Guide
Part Number 821025, Revision C
Страница 1: ... Leader of In Rack Audio Video Data Monitoring and Closed Captioning Solutions CONFIDENCE IS EVERYTHING SUM Series AMP1A SUM6 RD VMDA SUM8 1RU Summing Audio Monitors User Guide Part Number 821025 Revision C ...
Страница 2: ...tation Wohler Technologies Inc makes no warranty or representation either express or implied with respect to software documentation their quality performance merchantability or fitness for a particular purpose Wohler Technologies Inc reserves the right to change or improve our products at any time and without notice In no event will Wohler Technologies Inc be liable for direct indirect special inc...
Страница 3: ...requency information in stereo while a third center channel reproduces information below the 500 Hz crossover point for reproduction through the woofer The AMP1A SUM6 RD model has two midrange and one woofer speaker in a 6 5 depth The VMDA SUM8 provides either analog or AES digital inputs summed as mono or stereo through two amplifier drivers in an ultr shallow 4 5 depth Topics Topics Page Introdu...
Страница 4: ...rom being walked on or pinched particularly at plug s source on the equipment and at the socket 8 Use only the attachments accessories specified by the manufacturer 9 Unplug the equipment during lightning storms or when unused for long periods of time 10 Refer all servicing to qualified service personnel Servicing will be required under all of the following conditions The equipment has been damage...
Страница 5: ...nal power supply and connects an A C mains power source 65W 100 to 240 VAC 50 60Hz to the IEC connector provided on the rear panel of the unit Sympathetic Vibration Sympathetic vibration from other equipment cables etc in the rack may be serious enough to interfere with the unit s sound quality out in the listening area The use of thin card stock and or felt or foam weather stripping type material...
Страница 6: ...nect block diagram on page 15 for clarifi cation of the general signal paths into and out of the VMDA SUM8 unit Care should be exercised to avoid mismatched cable types and other similar causes of undesired refl ections in RF signal systems Electrical Interference As with any audio equipment maximum immunity from electrical interference requires the use of shielded cable however satisfactory resul...
Страница 7: ... in the rack and connect audio and AC power VMDA SUM8 Features Master volume control Balanced mono output of the selected channels on a 1 4 phone jack LED indication of input signal type digital or analog LED indication of digital input signal lock status Analog inputs on a DB 25 connector Digital inputs on four female BNC connectors Termination select for each digital input connector Gain calibra...
Страница 8: ... Inputs 6 on DB 25 Balanced 8 on DB 25 Balanced Analog Input Impedance 200k Balanced 100k Balanced Analog Input Level for Full Output 0 dBv Balanced 10 dB Unbalanced 0 dBv Balanced Program Output 1 4 Phono Jack Mono retains mix balance 0 dBv out at 0 dBv in under balanced conditions max volume settings Hum and Noise Better than 68 dB below full output Better than 70 dB below full output Electrical...
Страница 9: ...Select the headphone audio sources as you would for the internal speakers When you plug in headphones the speakers will mute This jack accepts a standard 1 4 phone type stereo plug as shown in Figure 1 1 below Power LED This LED glows green to indicate that the mains powered 24V power supply is connected to the power connector on the rear panel Power output RMS Each Side RMS Bass 10 W transient 5 ...
Страница 10: ...ond three source channels 4 5 and 6 which are electronically summed together for reproduction from the right internal speaker or right headphone if connected VMDA SUM8 Specific Controls Figure 1 2 VMDA SUM8 Front Panel Master Volume Control Turning this recessed trim pot clock wise increases the volume of the entire mix when turned counter clockwise it is decreased Note that this control comes aft...
Страница 11: ...ght AES audio source channels is adjustable allowing calibation relative to the analog input levels Digital gain calibration is accomplished by adjusting eight trim pots internal to the unit Digital gain calibration is factory set at 20 dBfs digital to 4 dBu analog for all eight channels See page 10 for setting instructions A Mute on Data feature is available allowing the unit to mute any of the f...
Страница 12: ...ram to the right of the connector AMP1A SUM6RD Specific Connectors Figure 1 3 AMP1A SUM6 RD Rear Panel Balanced Analog In 1 through 6 This balanced 200K female DB 25 connector accepts standard analog audio signals Only the top row of pins are used for audio input See Figure 1 4 below for pin out information including polarity Table 1 2 Button Indication Descriptions Selected Source Button LED Indi...
Страница 13: ...tandard analog audio signals and is configured for balanced 100k impedance connections For channel and pin out information of this connector refer to Figure 1 6 below or to the silk screened diagram for the connector on the rear panel 2 0A typical 24VDC 3 5A max VMDA SUM8 SERIAL NO 6 13 25 2 3 1 4 5 www Wohler com Fax Tel Technologies Wohler 1 510 870 0811 1 510 870 0810 14 1 7 8 ANALOG IN OFF ON ...
Страница 14: ...hannels 1 2 Input B Channels 3 4 Input C Channels 5 6 Input D Channels 7 8 AES Input Termination Select A through D These two two position DIP switch modules allow termination selection for each of the four AES inputs Each switch affects the connector to which it is closest If an input is connected to downsream equipment remove its termination by placing the associated switch in the up off positio...
Страница 15: ...7 AMP1A SUM6 RD Block Diagram Right Input Left Input 1 2 3 SOURCE LEVEL 5 6 2 3 1 4 5 6 SOURCE LEVEL 4 Right Left Right Summing Circuitry Left Summing Circuitry Right Left Source 1 Source 2 Source 3 Source 4 Source 5 Source 6 Left Speaker Woofer Speaker Right Speaker Woofer Speaker Stereo Analog Amplifier Headphone ...
Страница 16: ...UM Series User Guide Technical Functional Overview Figure 1 8 VMDA SUM8 Block Diagram Stereo Analog Amplifier Master MONO STEREO Balanced Program Output Mono Mix of Selected Source 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Volume Right Speaker Headphone Left Speaker ...
