Pinnacle DMP3 DualMicrophon PreAmp
Contents
1. Frequency response 20Hz to 80KHz 0 1 dB W eight Under lb Power Supply 9vAC 1Amp supply w 2 5mm plug O utput Impedance 500 Ohms WARNING This product contains chemicals including lead known to the State of C alifornia to cause cancer and birth defects or other reproductive harm Wash hands after handling M AUDIO DMPS3 C Tested to comply with FCC standards FOR HOME OR STUDIO USE Avid aX 2008 Avid Technology Inc All rights reserved P roduct features specifications system requirements and availability are subject to change without notice Avid M Audio and DMP3 are either trademarks or registered trademarks of Avid Technology Inc All other trademarks contained herein are the property of their respective owners DMP3 User Guide M Audio USA 5795 Martin Rd Irwindale CA 91706 Technical Support www m audio com tech tel pro products 626 633 9055 tel consumer products 626 633 9066 fax shipping 626 633 9032 sales m audio com 1 866 657 6434 626 633 9070 www m audio com M Audio U K Floor 6 Gresham House 53 Clarendon Road Watford WD17 1LA United Kingdom Technical Support support maudio co uk tel Mac and PC support 44 0 1753 658630 44 0 1923 204010 44 0 1923 204039 www maudio co uk Benelux Technical Support Belgium tel 32 22 54 88 93 Holland tel 31 35 625 0097 M Audio France Floor2. 688s FESS DELTA 66 S PDIF Computer It is conceivable that once the DMP3 is attached to your system and powered up you will be plugging and unplugging different microphones and instruments Follow this simple procedure making sure that the gain controls on the DMP3 are at their lowest levels when attaching or changing mics or instruments 1 Plug in the 9v wall wart power supply into the wall receptacle and the other end into your DMP3 9v power jack 2 Make the necessary connections from the outputs of the DMP3 to the inputs of your computer sound card mixer use the line level inputs or sound System s power amp NOTE If your target device accepts a balanced signal either on a 1 4 TRS or XLR jack use a TRS plug tip ring sleeve typically a stereo plug on the outputs of the DMP3 If your target device accepts only an unbalanced line in then use a TS plug tip sleeve i e a standard guitar cable C heck the documentation of your sound card or other receiving device if you are unsure When possible always use the balanced outputs as this will provide a quieter and hotter signal 3 With all volume controls at their lowest settings turn on your DMP3 then your sound system 4 DMP3 User Guide Setting the Gain The DMP3 provides up to 66dB of gain on the XLR and 1 4 high impedance inputs Microphones and guitar pickups typically emit a low signal level requiring a pre amp such as the DMP3 Other instr
3. DMP3 and ONLY the proper supply should be used Output Jacks A and B These 1 4 TRS jacks are the main outputs for the pre amps Using a TRS tip ring sleeve 1 4 plug the DMP3 will provide a balanced line level output Using a TS tip sleeve 1 4 plug the outputs will be unbalanced Phase Inversion S witches Each switch will invert the phase of the signal for the selected channel 180 degrees see section Phase Inversion High Impedance Instrument Inputs A and B These high impedance 100k O hm inputs are optimized for guitars or high impedance microphones These jacks are 1 4 TRS and will accept either 1 4 TRS or TS plugs balanced or unbalanced respectively W hen an instrument is plugged into this jack the corresponding channel s XLR input is disabled Microphone Inputs A and B These are the balanced low impedance microphone inputs to the pre amp channels NOTE When phantom power is engaged power is sent to the ground wire on BOTH of these channels An XLR jack is disabled when an instrument is plugged into the corresponding 1 4 jack User Guide 3 DMP3 Operation A preamp is a necessary component of any signal chain when a microphone guitar pickup or other instrument needs an increase in gain to line level The DMP3 will perform that role in your signal chain The drawing below shows the DMP3 in use with a computer sound card which in this case is the Delta 66 from M Audio DEUT US a
4. level you set on the DMP3 If your recording device does provide input level adjustments then we suggest using a unity gain setting as a starting point This is usually around the 2 00 position though your user guide may provide more information VU Meters The VU meters on the DMP3 are there to provide a visual reference to the signal at the output of the DMP3 They are however calibrated to correspond more closely to the level you will see on a recording device that has digital peak meters to show input level VU meters show an average of the signal voltages while peak meters show the true peaks in that signal Peak meters are in that sense more sensitive than VU meters and are more affected by timbre and pitch It is possible that a peak meter could be approching the OdB level the maximum possible before clipping while the VU meter shows very little movement The VU meters on the DMP3 are adjusted so that a more accurate visual representation is created in relation to the peak meters in your computer or digital recording device As mentioned this relationship will vary between instruments of different timbre and pitch Because of that you may want to compare the DMP3 VU levels to the inputs levels on your recording device for each performance and decide how hot you can go on the VU meters before clipping occurs on your recording device DMP3 User Guide 5 Hi Lo Gain Switches Two gain ranges are provided for the DMP3 pream
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6. M AUDIO DMP3 Dual mic preamp direct box User Guide Introduction Thank you for purchasing the M Audio DMP3 Microphone Instrument Pre Amplifier The DMP3 gives you two completely independent channels of high gain ultra low noise pre amps in a sturdy desktop unit Each channel provides low impedance microphone inputs on XLR connectors with optional phantom power plus an alternate high impedance instrument input on 1 4 TS jacks The DMP3 outputs can be used as balanced or unbalanced via its 1 4 TRS jacks Microphones guitars with magnetic or piezo pickups and any instrument that needs a boost in gain to line level will benefit from the superior sonic quality of the DM P3 Two separate gain ranges are conveniently selectable from the front panel for each DMP3 channel Low cut rumble filters for each channel eliminate unwanted low end noise while individual phase inversion switches ensure that you will always achieve the greatest result when using the DMP3 in a stereo or dual mic situation Large classic VU meters give an excellent visual representation of the DMP3 output levels DMP3 Features e 2 independent XLR fully balanced mic inputs e 2 alternate independent 1 4 unbalanced high impedance inputs impedance matched for ideal performance with electric and acoustic guitars and other high impedance mics or instruments Each preamp channel provides two gain ranges to accomodate a variety of output levels from micropho
7. adversely so its okay to have a dynamic mic at the XLR input while phantom power is switched on Justto be safe check you mic s documentation to see if it will accept or needs phantom power Balanced vs Unbalanced Outputs A balanced line runs the signal on two wires of opposing polarity as a twisted pair surrounded by a grounded shield Doing so it can send a hotter signal over a longer distance with less added noise Using a TRS tip ring sleeve sometimes referred to as stereo plug on the 1 4 outputs of the DMP3 will give you this balanced line tip positive ring negative and sleeve ground G enerally speaking if the DMP3 outputs connect to a system that accepts a balanced line at 4dB nominal level operating level you should use TRS plugs on the outputs An unbalanced line on the DMP3 outputs connects to a 1 4 TS tip positive sleeve ground plug on a shielded cable with a single conductor and is appropriate to use when your sound card or sound system accepts a 1 4 TS plug RCA plug or the right or left mono side of a stereo mini plug Typically the signal on unbalanced lines has an operating line level of 10dB nominal level though this may vary somewhat You may want to consult the user guide of your sound card recording device or signal processor mixer or sound system if you re not sure what type of signal it can accept If you need to find a primer on recording or sound reinforcement to learn more a
8. bout this and the other subjects covered in this manual Warranty Terms amp Registration Warranty Terms M Audio warrants products to be free from defects in materials and workmanship under normal use and provided that the product is owned by the original registered user Visit www m audio com warranty for terms and limitations applying to your specific product Warranty Registration Immediately registering your new M Audio product entitles you to full warranty coverage and helps M Audio develop and manufacture the finest quality products available Register online at www m audio com register to receive FREE product updates and for the chance to win M Audio giveaways DMP3 User Guide 7 Specifications Maximum Input 10 dBv Maximum O utput Balanced 22 dBv Maximum O utput Unbalanced 16 dBv Headroom 22 dB Meter headroom 12 dB Meter level 0 VU Q 12dBV 1KHz Maximum Gain Mic Instr In 66 dB G ain Range 13dB to 73dB Clip Indicator 3 dB below threshold of clipping Low Cut Filter C utoff 3 dB down 72 Hz Low Cut Filter Slope 18 dB Octave Input Impedance 1 kHz Mic In 3 kO hms Input Impedance 1 kHz Instr In 100 kOhms Noise Factor 1 5dB maximum gain Signal to noise 115dB A weighted minimum gain THD 0 02 minimum gain THD is below noise floor at most higher gain settings
9. nes and instruments e Exceptional frequency response extremely flat throughout all frequencies Separate low cut filters for each channel with switch and LED indicator e Separate gain controls for each of the pre amplifiers e Individual phase inversion switches for each channel e VU meters for each preamp channel gives excellent visual reference of output levels e Individual clip LEDs for each pre amp channel indicate peak levels e XLR 48v phantom power can be switched on or off for both mic inputs with an LED indicator e Dual purpose independent 1 4 outputs accept either tip ring sleeve plugs for balanced outputs or tip sleeve plugs for unbalanced outs e Sturdy desktop unit with a handsome vintage look DMP3 User Guide 1 Front amp Rear Panels Front Panel jm 10 Gain Adjustment Knobs Separate gain controls for pre amp channels A and B adjust the output volume levels independently Full counter clockwise is the minimum gain position while full clockwise is maximum gain VU Meters These VU meters show output level calibrated to correspond to digital peak meters where 0 VU is approximately 3dB to 6dB below clipping Clip LEDs The Clip LED will light when that input signal is too strong and is about to distort or clip 4dB below clipping If this LED remains lit for more than a few moments reduce the gain adjustment knob setting Low Cut LEDs The Low Cut LED when lit indica
10. ps The Hi Lo Gain switch on the front panel is used to select between the two gain ranges with the Out position being the default The Hi Lo Gain switch in the O ut position is the Hi G ain range while the In position switches the DMP3 to the Lo Gain range The gain range is considered to be from the beginning to the end of the Gain Adjustment Knob s travel from left to right In the Out or Hi Gain position the DMP3 preamp of the corresponding channel will provide 32dB to 66dB of gain using either the microphone inputs or the 1 4 high impedance instrument inputs In the In or Lo Gain position the DMP3 preamp of the corresponding channel will provide 6dB to 40dB of gain using the microphone or 1 4 high impedance instrument inputs Some mics or instruments will have a hotter output signal than others As a general guideline if you use a mic or instrument in the Hi G ain position and find that you can achieve a desirable output level with the G ain Adjustment Knob set somewhere between 10 00 and 2 00 or higher if necessary then the Hi Gain position is a proper choice If however you find yourself clipping while hardly any movement of the G ain Adjustment Knob has been made then switching to the Lo G ain position is advised Conversely if you are in the Lo G ain position and find that you have to tum the G ain Adjustment Knob past 2 00 then you might want to try lowering the gain and switching to the Hi G ain position Lo
11. tes that the Low Cut Filter switch has been engaged for the corresponding channel Hi Lo Gain S witch This switch will set the gain range or amount of gain possible for the corresponding input channel O nce the gain range is set gain is adjusted via the G ain Adjustment Knobs In the O ut position the gain range is 32dB to 66dB Hi gain In the In position the gain range is 6dB to 36dB Lo gain See sections Setting the Gain and Hi Lo Gain Switches for more information Low Cut Filter S witch Pressing and locking this switch to the In position engages the Low C ut filter for the associated channel Pressing and releasing to the Out position disengages the filter Main Power LED When the proper power supply is applied to the DMP3 and the Main Power switch is switched to the O n position this LED will light indicating that the unit is powered up Phantom Power LED When lit this LED indicates that phantom power has been switched on for both of the mic pre amp channels Main Power S witch This switch when pressed and locked to the In position Switches the DMP3 power on Phantom Power S witch When this button is pressed and locked to the In position phantom power 48v will be sent to both XLR In 1 and XLR In 2 DMP3 User Guide Rear Panel 1 DMP3 9vAC Power Supply Jack This power jack accepts a 9v AC 1 Amp 2 5mm power supply This power supply is included with your
12. uments such as keyboard sound modules may also benefit from a little bit of punch from the DMP3 Plug in your mic or instrument with the gain controls turned down then turn the gain up incrementally while testing the mic or playing the instrument When the VU meters show activity at a fairly consistent level you ve reached a good signal level for the DMP3 see section VU meters Some users may wish to experiment a little further to find what audibly might be referred to as a sweet spot Note that when the clip LED lights it is indicating that the signal is at least 4dB below clipping Let your ears be the judge but when the clip LED lights and stays lit you are approaching or have reached distortion in your DMP3 signal NOTE You must also consider the level that is being sent from the DMP3 to your recording device sound card input mixer or sound system Check the input meters at the receiving device and make sure that they are neither too low nor clipping too hot You may be able to adjust the input level or operating line level of this device otherwise an adjustment in gain on the DMP3 may be necessary Sound cards and other recording devices may or may not have an input level adjustment If your recording device tape recorder computer amp sound card etc does not provide input level adjustments then the signal level that you use to record will rely totally on your source voice mic guitar instrument etc and the
13. w Cut Rumble Filter W hen foot movements mic stand noise or other low frequency sounds are unwanted use the DMP3 Low C ut filter to reduce or remove them The DMP3 uses a 3 pole filter attenuating the signal 75Hz and below at the rate of 18dB per octave A Low Cut switch is provided on the front panel of the DMP3 Pressing and locking this switch to the In position will engage the low pass filter indicated by the lit low cut filler LED Phase Inversion It is possible with a stereo configuration 2 channel or when two microphones are recording one instrument for the two signals to become out of phase with each other When similar signals are out of phase they tend to cancel each other out greatly reducing signal level Engaging just one of the DMP3 Phase Inversion switches will remedy this situation If you suspect that your two channels are out of phase simply switch phase reverse for one of the channels and see if the sound suddenly comes alive 6 DMP3 User Guide Phantom Power Unlike dynamic microphones condenser microphones need to receive a DC voltage generally 48v from an external source before they can generate an output signal If the condenser mic doesn t come with its own power supply then Phantom Power must be applied from the pre amp Pressing the Phan button and engaging phantom power on the DMP3 will send the necessary voltage to both of the XLR Mic Inputs Phantom power will not affect a dynamic mic
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