Headphone Amplifier - Practical Devices Corporation
Contents
1. an impedance of 24 to 600 ohms gt 6 USB DAC To use the XM6 s USB DAC simply connect the XM6 to your computer using the included USB cable e The XM6 s rear panel USB connector takes a Mini USB Type B 5 pin plug e You may connect the XM6 through a USB hub if desired e The XM6 will not recharge from the USB cable IMPORTANT If the USB cable is connected and you want to plug in the AC adapter you must 1 unplug the USB cable 2 plug in the adapter then 3 reconnect the USB Failure to do so can cause USB hang ups Driver Support Windows7 Windows XP and Windows Vista Windows7 XP and Windows Vista have built in drivers to support the XM6 The first time you plug in the XM6 the drivers will automatically install J Found New Hardware Your new hardware is installed and ready to use ig 5 46 Knoppix Wikip W untitled Paint 9 EDES Tuesday You may have to choose the XM6 to be the default audio device Start Settings Control Panel Sounds and Audio Devices Audio Sound playback Default device If your media playing software Winamp Windows Media Player etc was running when you plugged in the XM6 you may have to exit and restart the media playing software Driver Support Linux MAC OS Most Linux distributions natively support the XM6 using ALSA Mac OS X and OS 9 also support the XM6 IMPORTANT Get in the habit of REMOVING YOUR HEADP2. and most importantly use good common sense 2010 Practical Devices Corporation All rights reserved www practicaldevices com Table of Contents Power Button Functions Crossfeed Controls Bass Treble Gain Boost 75Q output Voltmeter Joystick Auxiliary Connector Disassembling the Unit Re assembling the Unit Battery Power Systems Frequently Asked Questions Warranty and Guarantee Technical Specifications Gain Boost Switch 750 Switch IN position 8db extra boost IN position 750 output impedance OUT position Odb extra boost OUT position 00 output impedance Treble 2 5dB Crossfeed Enable Switch IN position XFeed enabled OUT position XFeed disabled Bass 6dB Power Button Press button 1 time Turn on power for 1 hour 3 times Turn on power for 3 hours 6 times Turn on power for 6 hours 7 times Turn on power forever 2 times Toggle flashlight mode 5 times Toggle blue LED dim Output Connect to Headphones Press and HOLD to turn unit off Treb 898 75n XM6 N e N Press once to display battery voltage For example if battery is at 8 5 volts 1 9 the amber LED will flash 8 then 5 Input Connect to MP3 gt player or other fai Ko J In audio source Amber LED Blue LED Flashes battery voltage when Power Button Indicates is pressed power is on Low Battery warning Flashes
3. HONES when doing such things as e connecting or disconnecting the USB cable or e Waking your computer up or putting it to sleep hibernation or shutdown e Switching the XM6 s rear panel switch e Connecting or disconnecting the XM6 s Line In connector Doing so will prevent your ears from being exposed to excessively loud bumps thumps clicks or overly loud music Smart people protect their hearing Power Button Functions XFeed Bass Treb 808 75 KMO Power Button A ctical D Hard am A The power button functions activated by pressing repeatedly within a three second window 1 press Turn unit on The XM6 turns off automatically after one hour 3 presses Turn unit on for three hours 6 presses Turn unit on for six hours 7 presses Turn unit on The XM6 will not turn itself off Press and hold Turn unit off The unit will respond to button presses by flashing the blue LED once for each hour it will stay on Additional power button functions 2 presses Toggle flashlight mode all LEDs on full 5 presses Toggle LED dimming Crossfeed Controls Crossfeed Adjuster Only works when switch is enabled Ha era Crossfeed Enable Switch XFeed Bass Treb 808 75n XM6 20000 DEVICES Ste reo G t The XM6 s Active Crossfeed circuit simulates the sound stage of loudspeakers through your headphones e Press the Switch IN to activate Crossfe
4. PRACTICAL DEVICES CORPORATION XM6 Headphone Amplifier XFeed Bass Treb BdB 750 KIO Practical DEVICES gt v y Q E gin User s Manual PRACTICAL DEVICES CORPORATION Thank you and congratulations on your purchase of the XM6 Portable Headphone Amplifier We ve worked very hard to provide you with what may be one of the most advanced feature packed and best sounding headphone amplifiers on the market today The XM6 is designed to be durable flexible easy to use practical and above all sound great Each unit is carefully manufactured and then rigorously tested for performance durability and sound quality If you have any questions that are not answered by this manual please feel free to send us an email Enjoy the amp Yours KZ PLEASE READ James Forest President amp CEO A Word About Protecting Your Hearing the most valuable piece of audio equipment you own are your ears Smart people protect their hearing When using the XM6 or any headphones get n the habit of removing the headphones from your ears whenever you Turn the XM6 on Connect or disconnect any cables including the USB cable Press the USB select button on the back of the XM6 e Turn your computer off on sleep standby with the USB cable connected e Do ANYTHING that may cause a sudden burst of loud sound Your only have one set of ears and you can t replace them Always listen to music at reasonable volume
5. To see the battery voltage if the unit is already on press the power button ZO The XM6 will warn you if the power falls below certain thresholds At around 6 5 volts the amber LED will begin to flash e Below around 5 2 volts the amber LED will double flash indicating the battery is very low 11 Multimedia Controller Joystick Your XM6 is equipped with a rear panel Joystick which has the following functions bp Next Track 44 Previous Track 4 Pil Play Pause Toggle bb bu 14 These functions only work when listening to USB audio We have arranged the joystick such that when you are looking at the front of the XM6 and reach around to the rearpanel joystick pushing the stick to your left is PreviousTrack and to your right is NextTrack left to right just like reading a book Sometimes in order for the joystick to work you have to enable multimedia hotkeys in the application software you are using For example In Winamp Rightclick gt Options gt Preferences gt Global Hotkeys Tick the box Enable default multimedia key support Most media player software iTunes Windows Media Player TLV work as is Due to the multitude of applications in existence Practical Devices can t offer support for any particular problems with your application 12 Aux Connector The rear panel of your XM6 has an Auxiliary Connector for future expandability The connector is 2x4 pins with 2mm pitch The pinout i
6. a one flash warning when the battery is low below 6 5 volts Flashes a two flash warning when the battery is very low below 5 2 volts Crossfeed Adjuster Source Select Switch Turn this potentiometer to adjust the amount of OUT position Source is USB DAG Crossfeed from near stereo to 100 mono IN position Source is front panel input Aux Connector Auxiliary connector for future expansion Includes Line Out power and USB control signals Multimedia Controller stick Push IN Play Pause Push LEFT Previous Track Push RIGHT Next Track The joystick works in USB mode only You may have to configure your OS and or media player for full functionality Power Connector Used to power and recharge the XM6 Use only the AC adapter supplied from Practical USB Connector Mates with Mini USB type B 5 pin plug Devices Note Before plugging in the AC adapter unplug the USB cable plug in the adapter then reconnect the USB cable Amplifier Interior View Connecting Your 6 1 Connect your headphones to the output jack 2 Connect a suitable source to the input jack as pictured Sources may be MP3 or CD players iPods or any line level devices Alternatively you may connect the XM6 s rear panel USB port Be sure to set the rear panel source select switch Switch out selects front panel input switch in selects USB 7 GO Your headphones can have
7. eble Boost approx 3dB 10kHz Active user adjustable from mono to stereo Crossfeed using potentiometer User can bypass using pushbutton Auto Power OFF User selects between 1 3 or 6 hour poweroff interval or unit can be set to stay on indefinitely Status Indicators Two LEDS one blue one amber indicating low battery warning battery voltage and power Integrated Voltmeter 100mV accuracy typical Mechanicals e Anodized aluminum case Glossy anodized amp etched front and rearplates Polished aluminum volume knob e FR 4 quad layer Printed Circuit Board with 1 OZ copper Turn on both LEDs to full brightness e Dimming mode Allows user to optionally dim Other Features the blue LED Play Pause NextTrack PreviousTrack joystick when using USB DAC Wolfson Microelectronics WM series High Performance stereo DAC operating at USB DAC amp 192kHz with 24 bit resolution Upconverter Upconverter Texas Instruments SRC4192 192kHz Asynchronous High Performance Sample Rate Converter XM6_v41 2010 p PRACTICAL DEVICES CORPORATION Practical DEVICES www practicalde
8. ed e Leave the button OUT for full stereo operation bypassing the Crossfeed circuit entirely Use a small screwdriver Philips or Straightblade to adjust the Crossfeed Potentiometer e All the way clockwise to produce a mono signal e All the way counter clockwise to produce a near stereo image Why would you want Crossfeed Most music is mixed to be listened to on loudspeakers The studio technicians mixing the recording assume there will be alot of crosstalk since with speakers the listener s left ear clearly hears the right speaker s output and vice versa Thus most music is mixed with a very wide stereo soundstage With headphones however the left ear only hears the left channel and the right ear only hears the right channel with nearly zero crosstalk This can for many recordings cause the soundstage to appear to be in the center of your head Further some recordings early Beatles recordings are infamous for this have each instrument and vocal track panned 10096 to either left or right which can almost immediately cause listener fatigue Crossfeed corrects this by blending some of the left channel into the right and vice versa Bass and Treble Boost You may use the bass and treble boost buttons to give the following approximate boosts Bass Boost 64 100Hz Treble Boost 3dB 10kHz 2048 1698 Frequency response with 1228 Bass Boost enabled 098 20He 20092 NK 20KHe 2098 Frequency respo
9. nal shipping Customer must pay for return shipping cost Further we warranty for a period of three 3 years that our products are free from any defects in workmanship Should you have any problems we promise to make it right The fine print warranty is in effect for a period of 3 years from date of purchase Problems must be reported to sales practicaldevices com This warranty covers any defects in workmanship It does not cover abuse physical damage or the like Should you need any service please email us at sales practicaldevices com 21 Specifications Portable Audio Headphone Amplifier Description with USB Upsampling and 24 bit 192kHz DAC Weight 145 grams 5 1 oz Lithium Ion Rechargeable System External Power Supply Lithium lon adapter charger 120 240VAC 50 60Hz worldwide compatible Battery Life approximate depending on installed options 35 hours Maximum Gain 18 4 dB Gain Boost enabled 10 3 dB Gain Boost disabled Frequency Response 20 20 000Hz 0 1dB 0 typical front panel input 3dB Point 21 kHz at top end typical front panel input 9 Hz at low end Total Harmonic Distortion 0 0005 typical front panel input Intermodulation Distortion 0 003 typical front panel input Signal to Noise ratio 20 20 000Hz typical front panel 110 dB input Dynamic Range 20 20 000Hz typical ne Specifications Continued Bass Boost approx 6dB 100Hz Tr
10. nse with oan Treble Boost enabled dE e0Hz BIO Nie Gain Boost With the volume knob at full your XM6 will deliver 10dB of gain Additionally you can enable the gain boost switch which will give you an extra 8dB of gain for a total of approximately 18dB In order to get the best possible noise floor you should not enable the Gain Boost unless a the volume of your headphones is too quiet and b you have already tried turning up the volume of your source mp3 player Usually the Gain Boost is only needed when using headphones which have an impedance greater than around 150 ohms 10 75 Output Impedance You can insert a 75 ohm impedance at the output jack by pushing the 750 switch E Switch OUT Normal mode Output Impedance 00 Switch IN High impedance mode Output Impedance 750 Why would you want 750 output impedance There are several headphone systems which can benefit In particular etymotic s ER 4P in ear headphones when used with the 750 feature enabled perform nearly identically to the generally regarded as much better ER 4S s Other headphones especially lower impedance headphones can also benefit It is a matter of personal preference Testing the Battery The XM6 can test its own battery When the XM6 is turned on the amber LED will display the battery voltage by flashing For example if the voltage is 8 5 volts the LED will flash 8 times then 5 times
11. ons for buffering the amp The XM6 has two sockets for two amplifier chips and two sockets for two buffer chips e Amplification The XM6 comes with two OPA134 amplifier chips There are many other amp chips you can also use Buffering you can use 1 Copper Busbars which connect pins 3 and 6 of the buffer sockets In this case all output drive from the XM6 comes from the amplifier chips 2 AD8397 DoubleCat a 2 channel amp and buffer chip on an SOIC to two DIP adapter Install in the AMP sockets in place of the OPA134 chips and use copper Busbars on the buffer sockets 3 BUF634 buffer chips from TexasInstruments which are very strong and quiet dedicated buffers For more FAQs see our website http www practicaldevices com faq_xm6 htm 17 Troubleshooting Here are some common problems and possible solutions ed doesn t work e Unplug the USB connector wait 10 seconds then plug it back in and restart your multimedia application Remember plugging in the AC adapter while USB is connected can cause USB malfunction You must disconnect USB connect the AC adapter then reconnect USB Always connect AC before USB 5 the rear switch set to USB e The USB port on your computer may be overloaded e Try a different USB port e Try using a powered USB Hub as shown in the diagram To Computer s USB Joystick does not work You need to enable multimedia key support in y
12. our OS or in your computer s media player See Page 12 Amp does not turn on or respond to pushing the power button e Battery is flat and needs to be recharged or replaced e Disconnect the battery hold down the power button for 10 seconds then reconnect the battery Headphone volume is too quiet even with the volume knob at full e Increase volume of source MP3 player If it is still too quiet then use the Gain Boost Output is in one ear only the other channel is dead e Check that all cables are completely plugged in all the way e Check that your cable is a stereo cable not a mono cable Output is louder in one ear than the other e Source is too strong turn down volume on source e Turn off dB Gain Boost switch 18 e Headphone impedance is too low Use headphones with a higher impedance 20 Warranty and Guarantee PRACTICAL DEVICES CORPORATION Practical Devices stands behind its products with a full no risk warranty and money back satisfaction guarantee Practical Devices offers a 30 day money back guarantee on all of our products If for any reason whatsoever you are unsatisfied with your purchase you may return it for your money back including your original shipping cost The fine print Unit must be returned within 30 days of sale Unit must be returned in the same undamaged good working order as it was received Practical Devices will refund you the original cost plus the cost of the origi
13. s proprietary but Practical Devices has released it into the public domain the pinout is shown below Nyt GROUND Oates 13 Disassembling the Unit FOR ADVANCED USERS ONLY If you want to replace the amplifier or buffer chips you will need to disassemble the unit Here s how 1 Turn the unit off and unplug all cables 2 Remove the volume knob using the a supplied 035 hex key ZO lt lt Remove two screws on rear panel and amp Gracia DEVIC the two screws on the front panel using the 7 Push included 7 64 hex key circuit 4 From the rear push the circuit board and board battery out the front of the case and battery from rear 5 Using tweezers or a small flat screwdriver gently wedge the chips out of their sockets Take care not to bend the pins of the chips See Figure 1 6 Insert the new chips also known as rolling the amp Make sure pin 1 denoted by a dot on the chip is oriented properly Take care not to bend the pins Alternatively copper Busbars may be used instead of buffer chips see Figure 2 Figure 1 Removing chips Wedge tweezers or a small flat screwdriver between chip and socket and gently work chip up and out Buffer chips What opamps and buffers can use See the FAQ on page 17 14 Figure 2 Busbars installed Reassembling the Unit 1 Install Battery e Connect ba
14. ttery connector with proper polarity there are markings RED WIRE and BLACK WIRE on the PCB to help Battery cable neatly underneath battery side of the battery is flatter than the other Orient battery with flatter side facing UP 2 Slide in PCB assembly from the back of the case Note the notch in the case for the volume knob 3 Install the front panel and screw it in 4 Install the rear panel Before screwing it down Beware Joystick top Joystick top metal piece is not caught on rearplate metal piece catching e Rearplate must be flush against case with no gap edge of rearplate Important The joystick has a top metal piece Do not let this metal piece catch the edge of the rearplate cutout if you do you could break off the joystick when you tighten down the rear screws Joystick top metal piece should go into the rearplate cutout Joystick top metal piece Other Reassembly Hints Don t put excessive force on the volume knob The pot is precision equipment and doesn t like to be manhandled e Similarly don t put excessive force on the power button Pushbutton switches Bass Treb etc Never try to remove the plastic pushbutton switch caps while the switch is in the IN position or you will break the switch Don t overtighten the setscrew for the volume knob 15 Battery System Yo
15. ur XM6 is equipped with the Lithium lon FastCharge System including an internal rechargeable battery and an AC adapter charger To recharge the XM6 just plug the charger into the powerjack on the rear of the XM6 e The battery will fully charge within two hours When charging is finished the LED on the charger will turn from red to green The battery will charge even if the XM6 is turned on e You can leave the charger connected indefinitely e You can expect up to 35 hours of use charge depending on installed options Your Charger is a World charger it will work with AC Mains voltages from 105 to 240 VAC at 50 or 60Hz If you are using the charger outside of North America you may need a plug adapter available from your local electronics store e DO NOT plug anything else into the powerjack or damage may result NOTE Only use the power supply that came with the XM6 Do not plug anything else into the powerjack or damage may result 16 Frequently asked Questions Can use a line level input to the XM6 such as from a CD DVD player or VCR Yes the XM6 will accept a line level input Can use the XM6 to drive speakers Usually no The XM6 was designed as a headphone amp and will usually not do a good job of driving speakers even small ones most speakers have impedances of around eight ohms What you are looking for is a power amplifier not a headohone amplifier What are my opti
Download Pdf Manuals
Related Search