MI4 User Manual(090620)
Contents
1. Position If you will be using a pair channels to power a single mono speaker place the switch in the Bridged position O O siie 00 Speaker Out The MI4 Power Amplifier has 2 channels outputs Each channel has a pair of multi way binding post connectors These are red and black screw posts on the rear panel of the amplifier Terminals are provided for L and R output If you will use the amplifier with a stereo mode not a bridged mode connect the speaker s positive Red terminal to the amplifier s positive Red terminal using the appropriate gauge speaker wire and connect the speaker s negative Black terminal to the amplifier s negative Black terminal immediately beside the positive terminal using the appropriate gauge speaker wire If you would like to use the amplifier with Bridged mode place the Mode Switch in the Bridged Position to be a single channel mono amplifier the two channels will be internally connected in series You will use both Red terminals to connect to the speaker the L channel s Red terminal will be positive terminal and the R channel s Red terminal will be negative terminal under Bridged mode mode Please verify that your speakers are capable of 1 Note This amplifier will supply 130W in Bridged handling such power to avoid possible damage Note The minimum impedance for the total load connected to a pair of channels in the2. Bridged mode is 8 ohm MI4 Power Amplifier Specifications Power Bandwidth 20Hz 20kHZ 50W per Channel into 8 ohms loads with less than 0 05 THD N 65W per Channel into 4 ohms loads with less than 0 1 THD N 130W Bridged Mono into 8 ohms with less than 0 1 THD N Crosstalk gt 60dB 1KHz referred to rated power at 8 ohms Frequency Response 25Hz to 50kHz 0dB 1 0dB Signal to Noise ratio gt 98dB RCA Line Input Sensitivity 220mV Max Speaker Input Sensitivity 2 3V Max AC Power Consumption 360W All Channels Driven Dimensions 19 w x 7 87 d x 2 85 h 1 5U Option Rack Space Style Net Weight 5 65 kg Gross Weight 6 25 kg AC Mains Fuse 115V 60Hz T3 15AL 250V 230V 50Hz T3 15AL 250V NOTE This amplifier is capable of use with standard US voltage 115V as well as European voltage 230V The A amplifier will be preset for the voltage of the country it is sold in Use with other voltages requires some changes to be made to the amplifier Should you wish to use the amplifier in a country other than the one for which it was purchased please contact OSD AUDIO at 562 697 2600 Limited Warranty OSD AUDIO warrants its amplifier products against defects in materials and workmanship for a limited period of time For a period of two years from date of original purchase we will repair or replace the product at our option without charge for parts and labor This limited warranty applies only to purchases f
3. MI4 Power Amplifier OWNER S MANUAL TO PREVENT FIRE OR SHOCK HAZARD DO NOT USE THIS PLUG WITH AN EXTENSION CORD RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE e TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE e TO PREVENT ELECTRICAL SHOCK MATCH WIDE BLADE PLUG TO WIDE SLOT FULLY INSERT A The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of un insulated dangerous voltage within the products enclosure that may be of CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN Warning To reduce the risk of electric shock do not remove cover or back No user serviceable parts inside Refer servicing to qualified service personnel A The exclamation point within the equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instructions in the literature accompanying the sufficient magnitude to constitute a risk of electric shock to persons appliance IMPORTANT SAFETY INSTRUCTIONS Read these instructions Keep these instructions Read all warnings Follow all instructions Do not use this appliance near water Clean only with dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instructions 8 Do not install near heat sources such as radiators h
4. ad and observe all safety instructions detailed on each page Note If any part of this product is damaged or missing please call OSD AUDIO Return Department at 562 697 2600 Using the controls Front Panel Power POWER O The POWER push button will manually switch the MI4 Power amplifier on or off The blue LED beside the button indicate its power status Whenever the amplifier s power switch is on the LED will illuminate blue eee ae no D vie eee OQ ee j a BER Speaker Out Bridged Stereo BASS GAIN LEFT VOLUME RIGHT VOLUME OUTPUT ADJUSTMENT BASS GAIN LEFT voLume RIGHT VOLUME Lmax Rmax e o o MIN max MIN max MIN max The RIGHT VOLUME and LEFT VOLUME knobs are for individual adjustment of left channel and right channel output The corresponding L MAX and R MAX LED show the output level status when the output is adjusted to reach clip they will illuminate RED The BASS GAIN knob is used for adjust the gain of Bass for the output Speaker In i CAUTION FUSE T3 ABAL 250V Use Class 2 Wiring Do Minimum Impedance 8 ohm 230V When Using Bridged Mode 115V 60Hz 200W x Minimum Total Impedance in 230V 50Hz 200W Stereo Mode 4 ohm m Using the controls Back Panel INPUTS r 2 Out In There is a total of 2 pairs of RCA input on the rear panel of the MI4 Power Amplifier These RCA inputs are labeled as Line 1 and Line 2 They are also designed
5. eat registers stoves or other appliance 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 anda third grounding prong 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 the plugs convenience receptacles and at the point where they exit from the appliance 11 Only use attachments or accessories specified by the manufacturer 12 Unplug the appliance during lightning storms or when unused for long periods of time 13 Refer all servicing to qualified personnel Servicing is required when the appliance has been damaged in anyway such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the appliance the appliance has been exposed to rain or moisture does not operate normally or has been dropped NOOR WNDM This appliance shall not be exposed to dripping or splashing water and no object filled with liquids such as vases shall be placed on appliance MI4 Power BOSD MODEL MI 4 STEREO POWER AMPLIFIER POWER Congratulations on your purchasing of OSD Power Amplifier Please take a few moments to read the entire manual and be sure to retain this document for future reference Please re
6. ons Powering Speaker Outdoors Whenever you are using speakers outdoors you should be aware that sound does not travel like it would be in your home Without the reflective surfaces of walls and ceilings sound at outdoors will dissipate quickly Therefore in an outdoor situation the MI4 Power Amplifier provides the opportunity to bridge adjacent channels effectively doubling the available power for your speakers This can help to overcome the problem of using speakers outdoors assuming the speakers chosen are capable of handling the additional power It should be noted that the MI4 Power Amplifier is rated to operate into a minimum 8 ohm bridged load Therefore if you are using more than a single 8 ohm loudspeaker in bridged mode you should consider using an impedance matching speaker selector such as the SSVC 6 or possibly using an impedance matching volume control such as the SVC 70 SVC 100 SVC 300 VKR 120 VMS 100 or VMX 300 in a weatherproof housing available at your favorite DIY store or electrical supply The choice of a volume control would allow you the additional flexibility of being able to attenuate the volume whenever necessary Stereo Setup In this configuration the Mode switch is set to Stereo for stereo operation Connect the line out jacks from a stereo preamplifier or source to the Line 2 Input jacks of your MI4 Power Amplifier Then connect your speakers to the output Binding Post observing proper pola
7. rity You can check OUTPUT on Page 4 for reference about the polarity From Source Speaker In pure 21 Out In To Speakers Mono Setup In this configuration the Mode switch is set to Bridged for Bridged operation Connect the line out jacks from a stereo preamplifier or source to the Line 2 Input jacks of your MI4 Power Amplifier Then connect your single mono speaker to the output Binding Post observing proper polarity You can check OUTPUT on Page 4 for reference about the polarity Speaker Out Ye To Mono Speaker Setup For Multiple Sources In the application shown below a distributed audio system is connected to the MI4 Power Amplifier as a local zone amplifier via the Line 2 Input Normally the distributed audio system will be the audio source for the MI4 Power Amplifier The distributed audio can be passed on to be used by additional zones or sub zones in the distributed system via the Line 2 Output Whole House Distributed Audio pur 2 Out In Local Source Audio Out Whole House Distributed Audio The audio output of a local source such as MP3 Player CD Television computer etc is connected to the MI4 Power Amplifier via the Line 1 Input and whenever the local source is active its signal will take priority over the distributed audio signal present at Line 2 However the distributed audio signal will still be present at the Line 2 Input In this circums
8. rom authorized OSD AUDIO retailers This limited warranty is extended only to the original purchaser and is valid only to customers in USA Customers are required to provide a copy of the original sales invoice from an authorized OSD AUDIO dealer when making a claim against this limited warranty This limited warranty only covers failures due to defects in materials or workmanship that occur during normal use It does not cover failures resulting from accident misuse abuse neglect mishandling misapplication alteration faulty installation modification service by anyone other than OSD AUDIO or damage that is attributable to acts of god It does not cover costs or transportation to OSD AUDIO or damage in transit The customer should return their defective product freight prepaid and insured to OSD AUDIO only after receiving a Returned Merchandise Authorization RMA number This warranty will become void if the serial number identification has been wholly or partially removed altered or erased Repair of replacement under the terms of this warranty does not extend the terms of this warranty Should a product prove to be defective in workmanship or material the customer s sole remedies will be repair or replacement as provided under the terms of this warranty Under no circumstances shall OSD AUDIO be liable for loss or damage direct consequential or incidental arising out of the use of or inability to use the product Applicati
9. tance the audio output ofthe local source will be heard via the MI4 Power Amplifier Once the local source is turned off or muted the MI4 Power Amplifier will automatically switch back to the distributed audio system as an audio source assuming the local source remains inactive The delay time is 12 seconds when switch back to the normal source will occur This set up assumes all incoming signals are at line level and not at speaker level Whole House Distributed Audio Local Source Audio Out If the Whole House Distributed Audio was only available as a speaker level signal you could connect it to the Speaker In connections and set the switch which is on the right side of Line 1 Input RCA connectors to the Line 2 position or toward to the left hand position of the switch The MI4 Power Amplifier will no longer be able to pass the Whole House Distributed Audio to another zone via the Line 2 Output If you have any questions regarding how to set this up please call OSD AUDIO support at 562 697 2600
10. with an R and L as Right Channel and Left Channel inputs respectively Line 2 Input should be used as the primary or normal input for various line level sources that may be available locally to the amplifier Line 1 Input is a priority switching input that can be used for a second input such as the output of a second source and will take over as primary input whenever the signal is present If the Line 1 Input signal is absent after 12 seconds the input will revert to the Line 2 Input signal The Line 2 has OUT RCA connectors to loop the Line 2 signal to other devices The MI4 Power Amplifier also provides a pair of speaker level input labeled as Speaker In for those applications where either of the sources has only speaker level output signal available The Speaker In signal will be mixed with Line 1 or Line 2 input signal controlled by the switch labeled Line 1 and Line 2 as option on the right side of Line 1 Input RCA connectors Level MIN MAX This screwdriver adjustment knob labeled as LEVEL can be used to adjust the sensitivity of MI4 inputs from MIN to MAX OUTPUT MA Bridged Stereo To the right of the Speaker Out connectors is a switch labeled Mode with Stereo and Bridged as options It is used to switch the output mode of MI4 If you will be connecting a pair of speakers to the amplifier place the switch in the Stereo
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