Inter-m CA-8320 Operating Manual

Unpacking ............................................................................................................................... 3 Warnings .................................................................................................................................. 3 Operation................................................................................................................................. 5 Features ....................................................................................................................................... 6 Front Panel Controls.................................................................................................................... 7 Channel Section...................................................................................................................... 7 Digital Effects Section.............................................................................................................. 8 Effects Section ......................................................................................................................... 8 Tape In Section........................................................................................................................ 9 Aux In Section.......................................................................................................................... 9 Monitor Section ..................................................................................................................... 10 Main Section.......................................................................................................................... 11 Power Amp Section............................................................................................................... 12 Input/Output Section ............................................................................................................ 14 Rear Panel Controls............................................................................................................... 16 Connections.............................................................................................................................. 17 Speaker Connection............................................................................................................. 17 External Connections............................................................................................................ 19 Basic Operation ........................................................................................................................ 20 Connecting Mics, Instruments and Devices ....................................................................... 20 Using The Built-In Digital Reverb........................................................................................... 20 Application-Specific Setups .................................................................................................... 21 Conference PA/Installed Sound System ............................................................................. 21 Band PA System .................................................................................................................... 23 Block Diagram .......................................................................................................................... 25 Specifications............................................................................................................................ 26 2

Thank you for purchasing this fine Inter-M product. All of us here at Inter-M are dedicated to providing you with the highest quality products and the best value. We sincerely trust this product will provide you with years of satisfactory service, but if anything is not to your complete satisfaction, we will endeavor to make things right. Welcome to Inter-M, and thank you for becoming a part of our worldwide extended family! Unpacking Please take a few minutes to read this brief manual and familiarize yourself with the important information regarding product features, setup and operation. As with most electronic devices, we strongly recommend you retain the original packaging. In the unlikely event the product must be returned for servicing, the original packaging (or reasonable equivalent) is required. Warnings Environment Never place this product in an environment that could alter its performance or reduce its service life. Such environments are usually characterized by high levels of heat, dust, moisture, or vibration. Safety 1. Read these instructions carefully. 2. Follow all instructions. 3. Keep all warnings. 4. Do not operate this apparatus near water. 5. Clean only with a damp cloth. 6. Do not block any of the ventilation openings. 7. Install in accordance with the instructions in this manual. 3

devices (including amplifiers) that produce heat. 9. Do not defeat the safety purpose of the polarized or grounding type plug. A polarized plug has two blades, with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. 10. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where it is attached to the apparatus. 11. Use only the attachments/accessories specified. 12. Use only with a cart, stand, tripod, bracket, or table specified, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid overturning. 13. Unplug this apparatus during lightning storms or when unused for long periods of time. 14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. 4

on. Keep volume levels at minimum gain and equalization set to 0dB position before switching on. When the AC Mains power switch is pressed, this unit starts operation with tuner display. NOTE: The system’s operation is delayed by approximately three seconds after pressing the AC Mains power switch. This is due to the built-in protection circuitry, designed to protect the speakers and other system components. 5

• Six Mono and two Stereo inputs, plus separate outputs for main speakers and monitor speakers. Dedicated Amplification for Mains and Monitors • Two separate 200W amplifiers to power two main speakers plus another 200W amplifier to power monitor speakers – 600W total power. Mode Select for Bridged Mono • Left and Right amplifiers can be bridged together to provide 400W of power. Versatile EQ Controls • Three-band EQ on each input channel, plus seven-band graphic EQ on main output. Phantom Power • Built-in +48V Phantom Power for condenser microphones. Tape In and Aux In • Additional inputs for connecting instruments and other line level sources. On-Board Signal Processing • Built-in digital effects (reverb). 6

Channel Section 4. Pan Pots These knobs control the Panning (L-R) function for the associated Input Channel. Use these to position the channel’s signal within the stereo output mix. 1. EQ Controls These knobs provide control of the EQ for the Input Channels. Three bands of equalization are provided: Low (80Hz), ±12dB, shelving type Mid (2.5kHz) ±12dB, peak type High (12kHz) ±12dB, shelving type 2. Monitor Controls These knobs control the level sent to the Monitor buss. The Monitor buss signal is sent to the Monitor Amp jacks in the Input/Output section, and to the rear-panel Monitor Output jacks. The Monitor buss signal is pre-fader, and is unaffected by the channel’s Level Control (5). 3. Effect Controls These knobs control the level sent to the Effect buss. The Effect buss signal is sent to the Input/Output section EFX Output. The Effect output signal is post-fader, and is directly affected by the channel’s Level Control (5). 7

These knobs provide control of the associated channel’s input signal level. 6. Pad Switch These switches attenuate the input signal by –30dB. Activate this switch when connecting a line-level source to the associated channel, or when the input signal is distorted. Digital Effects Section 7. Effects Select Switch This switch selects the type of digital reverb. Choose between Small Hall, Large Hall or Vocal type. 8. DSP (Digital Signal Processor) This switch activates the digital reverb, sending its DSP to the Main (L/R) and Monitor busses. The level of DSP is controlled by the EFX/Return controls in the Main and Monitor sections. Effects Section 9. Effects Out Level This knob provides control of the effects send level for an external effects device as connected to the EFX Out jack in the Input/Output section. NOTE: This knob does not control the level of the internal digital reverb. 8

10. Tape In Control This knob provides control of the level of signal sent from the Tape In jacks to the Main L/R buss. Aux In Section 11. Aux In Control This knob provides control of the signal level sent from the Aux In jacks to the Main L/R buss. 9

Each slider controls the cut (decreased gain) or boost (increased gain) for its associated frequency band in the MONITOR section. The middle position indicates flat response (no cut or boost). Moving the slider upwards increases that frequency’s gain, while moving it down decreases the level of that frequency. NOTE: The Monitor Graphic Equalizer affects the Monitor buss signal that is output to the speakers, and the line level signal output to the Monitor Out jack in the Input/Output section. 13. Monitor EFX Return Control This knob provides control of the amount of built-in digital reverb sent to the MONITOR buss. 14. Monitor Master Control This knob provides control of the level of the MONITOR buss sent to both the speakers and the MONITOR OUT jack. (Input/Output Section) 15. Monitor Output Level Display This seven-segment LED meter indicates the amount of signal sent to the MONITOR OUT jack. (Input/Output Section) 10

Each slider controls the cut (decreased gain) or boost (increased gain) for its associated frequency band to the Main L/R buss. The middle position indicates flat response (no cut or boost). Moving the slider upwards increases that frequency’s gain, while moving it down decreases the level of that frequency. NOTE: The Main Graphic Equalizer affects the Main L/R buss signal that is output to the speakers, and the line level signal output to the Main Out jack in the Input/Output section. 17. Main L/R EFX Return Control This knob provides control of the amount of signal returned from built-in digital reverb to the Main L/R buss. 18. Main L/R Master Control This knob provides control of the level of the Main L/R buss sent to both the speakers and the Main L/R OUT jack. (Input/Output Section) 19. Main L/R Output Level Display This seven-segment LED meter indicates the amount of signal sent to the Main L/R jack. (Input/Output Section) 11

20. Mode Select This switch selects the configuration (or mode) of the Main L/R Power Amplifiers. STEREO: The Main/LR Amplifiers send a stereo signal from the mixer section. L+R Bridged: The Main/LR Amplifiers are bridged (combined) to deliver a mono signal ONLY from the Bridge jack. 21. Power Indicator This LED indicator is lit when the AC mains to the CA-8320 is switched on. 22. Phantom Power Switch This switch activates the phantom power supply for channels 1-6. When the switch is switched on, +48VDC power is supplied to pins 2 and 3 of each channel’s input connector. Use phantom power when connecting condenser microphones, which require an external power supply. NOTE: It is safe to connect most modern dynamic microphones or line level devices to the channel inputs when phantom power is activated. However, some older ribbon microphones may be damaged by phantom power, and certain unbalanced line level devices may malfunction or produce an audible hum when phantom power is active. 23. Phantom Power Indicator This LED indicator is lit when phantom power is activated. 24. Clip Indicators These red LEDs illuminate when distortion exceeds 1% on a particular output channel. TIP: Try reducing the input level. 12

This LED indicates the state of the amplifier’s protection circuitry. When the Protection LED is on (illuminated), the protection circuitry is active, indicating that the unit is not operating normally. This is typically due to overheating or power limiting. Please check the Input and Output condition of the amplifier. 13

Each channel provides a high impedance (“high-Z”) input on a balanced 1/4” tip-ring-sleeve connector for line-level devices (synths, drum machines, etc.), and a low impedance (“low-Z”) input on a balanced 3-pin XLR jack for mic-level sources such as condenser and dynamic microphones. Both inputs may not be used simultaneously. NOTE: When phantom power is switched on, +48V power is sent to the 3-pin XLR jacks of ALL six channels (1-6). To avoid damaging high-Z devices, be sure sources not requiring phantom power are connected only to the high-Z 1/4” jacks. The wiring convention used in the CA8320’s inputs are as follows: 14

MIC INPUTS Both channels are active balanced, eliminating input transformers while maintaining the RF and hum rejection of transformer coupled circuits. Nominal input level: -50dB to –20dB. IMPORTANT: When a mic (or equivalent 150 Ω source) is NOT connected to these inputs, be sure the channel volume level is set to “0.” LINE INPUTS Channels 7 & 8 are used for connecting unbalanced line level devices such as CD players. NOTE: If only the L/MONO input is used, its signal is sent to both L and R busses. 3. Effects (EFX) Output Jacks Connect this to the input of an external effects processor. The Effects Control on each Channel Input determines the level of signal sent to the Effects buss. The Effects Out Control in the Effect Section determines the amount of signal returning from the Effect Buss. 4. Foot Switch Jack Connecting an on/off foot switch here will provide on/off control of the built-in digital reverb. The Digital Effect switch on the front panel must be in the “ON” position. 5. External Input Jacks Connect line level devices such as effects processors to the Aux In jack, and stereo devices such as CD or cassette decks to the Tape In jacks. 6. External Output Jacks These outputs send line level signals to external devices: Rec Out: These are unbalanced outputs on RCA jacks, for connection of an external recording device. The output signal is pre-EQ and pre-Master L/R output level control. Monitor Out: This is an unbalanced 1/4" phone jack, for connection of a separate monitor speaker. Main Out: These are unbalanced 1/4" phone jacks, for connection of the main output speakers. The signal is post-EQ and post- pre-Master L/R output level control. 15

1. Speaker Output Jacks The CA-8320’s design provides up to 200W per channel to the Main L and Main R stereo outputs, or 400W using the Bridged (mono) output jack. The separate Monitor outputs deliver a maximum of 200W per channel. Two 8Ω speakers can be connected to each of the MAIN L and MAIN R jacks in a four-speaker setup. The 400W Bridged mono output is designed to power only one 8Ω or two 16Ω speakers. Be careful when using the Bridged output to avoid connecting any speakers to the Main L/R A or B jacks. When connecting to only the A or B (not both) jacks, use a 4Ω or 8Ω speaker. IMPORTANT: When connecting to both A and B jacks, use an 8Ω or 16Ω speaker (being careful not to inadvertently connect a speaker to the BRIDGED output). NOTE: Use the Control Panel’s Amp Select switch to select which signal is routed to the jacks or to activate bridged mono operation. 2. Power Switch This switch is used to switch the unit on and off. When the unit is on, the front panel Power Indicator LED is lit. CAUTION: Reduce the MASTER and MONITOR levels before switching the CA-8320 on or off. 16

and cables. Speaker Connection The diagram below presents three approved CA-8320 speaker setups. Please take notice of the speaker impedance (Ω) requirements of each and be careful to avoid impedances lower than those specified. 17

to one or both MONITOR A/B outputs. Please be careful to avoid impedances lower than those specified. 18

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1. Switch off any powered instruments, mics, or devices before connecting to your CA-8320. Also be sure to reduce all channel and main output levels before making connections. 2. Connect cables to your mics, instruments, and devices before inserting the other end firmly into the appropriate 3-pin low or 1/4” high impedance jacks on channels 1-6 Use the same procedure when connecting MIC or stereo line level devices into channels 7 & 8. For proper signal level, switch on the PAD switch when connecting line level devices to channels 1-6 and please note the low and high impedance inputs cannot be used simultaneously. 3. Switch devices on in the order they are connected to your CA-8320. Reverse the order when switching power off. 4. Set the Main section’s Master control to the “” position. 5. To set correct input channel levels, adjust the Input Channel Level control so that the “0” LED of the Main section’s peak level meter illuminates intermittently. 6. Rotate the Input Channel EQ knobs to change that channel’s tone. 7. Use the Main section’s Master control and Graphic EQ to adjust the overall volume and tone. Using The Built-In Digital Reverb 1. After setting levels and adjusting EQ, press the DSP ON switch in the DSP section. 2. Using the Effect Select switches in the DSP section, select a reverb most appropriate for all the mics and/or instruments connected. Your three choices are: S.HALL (small hall reverberation) L.HALL (large hall reverberation) VOCAL (reverb suitable for vocals) 3. Increase the Input Channel’s EFX control on the channels you want reverb, until the desired amount of reverb is heard. 4. Using the Main/Monitor section’s EFX RTN knob, adjust the total amount of reverb now returning from the built-in digital reverb. NOTE: If the reverb’s sound is distorted even with the EFX RTN at minimum gain, you will need to lower the EFX level of one or more channels. 20

following CA-8320 sample setups. Conference PA/Installed Sound System In the POWER AMP section, set the power amp mode to STEREO. Connect mics to channels 1-8. For CD playback, connect the player’s outputs to the 1/4” Line Input jacks on channels 7 and 8, or to the AUX IN jacks. 21

device to the REC OUT jacks of the CA-8320. To Play Back a CD 1. Switch the power on to the CD player and then to the CA-8320. 2. Set the MAIN section’s MASTER control to the “” position. 3. Begin CD playback. 4. Adjust the level coming from the CD player with each CHANNEL level control such that the 0 LED of the MAIN section’s peak level meter illuminates intermittently. 22

In this example, separate main and monitor mixes and an external effects device are all accommodated. In the Power Amp section, set the mode to STEREO. Connect mics or line level instruments (such as electronic keyboards) to channels 1-8. Connect the main speakers to the Power Amp Main L/R A/B jacks. Connect the monitor speakers to the Power Amp Monitor A/B jacks. To connect an external processor such as a delay unit, connect that unit’s input to the CA-8320’s Effect Out jack. Then connect the unit’s output to the CA-8320’s AUX IN jack. 23

1. Set the Monitor section’s Master control to the “” position. 2. Using the MON controls, adjust each channel’s level. This creates your independent monitor mix. 3. Use the Graphic Equalizer and the Master controls of the Main/Monitor sections to adjust the overall tone and volume. TIP: USING AN EXTERNAL EFFECT 1. Set the Monitor section’s Master control to the “” position. 2. Using the EFX controls on the desired channels, adjust the amount of effect applied to each channel. 3. Adjust the input level of the external effects device so it gets enough level but doesn’t distort. Use the CA-8320’s AUX IN control to adjust the level returning from the external effects device to the CA-8320’s effects buss. 24

Main Stereo 200W + 200W/4Ω Main Bridged 400W/8Ω Monitor 200W/4Ω Frequency Response 20Hz – 30kHz T.H.D. Mixer Section Less than 0.1% Amp Section Less than 0.5% Input Sensitivity/Impedance Lo-Z 50dB, 600Ω Balanced Hi-Z -40dB, 600Ω Balanced Tape In -10dBV/10kΩ Unbalanced Aux In -10dB/10kΩ Unbalanced Hum and Noise (EIN) -128dB Crosstalk -70dB Buss Noise -78dB Tone Controls High 12kHz, ±15dB Mid 2.5kHz, ±12dB Low 80Hz, ±15dB Graphic Equalizer (±12dB) 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.4kHz, 12kHz Phantom Power +48VDC GENERAL Mains Power Source 100V–120VAC or 220-240VAC 50/60Hz Mains Power Consumption 517W Weight 22kg (59 lbs) Dimensions 480 mm(W) x 277 mm(H) x 320 mm (D) 18.9 in (W) x 10.9 in (H) x 12.6 in (D) Specifications and design subject to change without notice for product improvements. 26

Since then, Inter-M has grown to become one of the largest manufacturers of professional audio and commercial sound electronics equipment in the world. Inter-M has gained worldwide recognition for its own branded products, as well as private label manufacturing of electronics sold under other names (OEM). The company is no longer just a Korean company, but rather a global company that is truly international in scope, with factories and offices in Korea and China, and sales and marketing operations located in Japan, Europe, and the U.S.A. With more than 850 employees around the globe, Inter-M is well-poised for further growth and expansion. INTER-M AMERICAS, INC. 1 EAST BEACON LIGHT LANE, CHESTER, PA, USA 19013-4409 TEL: (610) 874-8870, FAX: (610) 874-8890 Home Page:http://www.inter-m.net, E-mail: [email protected] INTER-M Corporation SEOUL OFFICE: 653-5 BANGHAK-DONG, DOBONG-KU, SEOUL, KOREA TEL: 82-2-2289-8140~8, FAX: 82-2-2289-8149 Home Page:http://www.inter-m.com, E-mail: [email protected] 0704CA8320 PRINTED IN KOREA 27