- Practical Devices Corporation
Contents
1. Asked Questions Can I use a line level input to the XM5 such as from a CD DVD player or VCR Yes the XM5 will accept a line level input Can I use the XM5 to drive speakers Usually no The XM5 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 headphone amplifier What are my options for buffering the amp The XM5 has two sockets for two amplifier chips and two sockets for two buffer chips e Amplification The XM5 comes with two OPA134 amplifier chips There are many other amp chips you can also use e Buffering For the buffer sockets you can use 1 Copper Busbars which connect pins 3 and 6 of the buffer sockets In this case all output drive from the XM5 comes from the amplifier chips 2 BUF634 buffer chips from Texasinstruments which are very strong and quiet dedicated buffers For more FAQS see our website http www practicaldevices com faq htm 15 Troubleshooting Here are some common problems and their solutions USB doesn t work e Unplug the USB connector wait 10 seconds then plug it back in and restart your multimedia application e 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 Amp does2. return shipping cost Further we warranty for a period of one year 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 one year 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 17 LI LI m Specifications Weight 157 grams 5 5 oz Power Source e Optional Lithium lon Rechargeable System or e 9 volt Alkaline or e 9 6V Lithium non rechargeable External Power Supply Optional Lithium lon charger Battery Charge Time Lithium FastCharge System 1 5 hours Battery Life approximate Alkaline 50 hours Lithium lon 40 hours Lithium NON rechargeable 100 hours Maximum Gain 20 6 dB Gain Boost enabled 12 1 dB Gain Boost disabled Frequency Response 20 20 000Hz 0 1dB 0 4dB typical FrontPanel input 3dB Point 21 kHz at top end typical FrontPanel input 9 Hz at low end Total Harmonic Distortion 0 0007 typical FrontPanel input Intermodulation Distortion 0 005 typical FrontPanel input Signal to Noise ratio 20 20 000HZ typical FrontPanel 103 dB input 18 Specifications Continued Dynamic Range 20 20 000Hz typical 19898 Bass Boost approx 6dB 100Hz Treble
3. sound Your only have one set of ears and you can t replace them Always listen to music at reasonable volume and most importantly use good common sense 2008 Practical Devices Corporation All rights reserved www practicaldevices com Table of Contents Power Button Functions Crossfeed Controls Bass Treble Gain Boost 750 output Voltmeter Disassembling the Unit Re assembling the Unit Battery Power Systems Frequently Asked Questions Troubleshooting Warranty and Guarantee Technical Specifications XM5 Block Diagram Gain Boost Switch 75Q Switch IN position 10db extra boost IN position 75Q output impedance OUT position Odb extra boost OUT position OQ output impedance Crossfeed Enable Switch Treble 2 5dB IN position XFeed enabled 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 OUT position XFeed disabled Bass 6dB 2 times Toggle flashlight mode 5 times Toggle blue LED dim Output Connect to Headphones Press and HOLD to turn unit off XFeed Bass Treb 10dB 750 XM Press once to display battery voltage ddako Aa P For example if battery is at 8 5 volts the amber LED will flash 8 then 5 Input Connect to MP3 DEVICES lt oN bezte a QO Main Volume Volume Blue LED Indicates powe
4. Boost approx 3dB 10kHz Active user adjustable from mono to Crossfeed stereo 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 Integrated Voltmeter 100mV accuracy typical Mechanicals Anodized aluminum case Glossy laser anodized faceplate Polished aluminum volume knob FR 4 dual layer Printed Circuit Board with 1 oz copper Flashlight Mode Turns on both LEDs to full brightness Dimming mode Allows user to optionally dim the blue LED Japanese TI2702 04 DAC 0 006 THD 44 1 48kHz USB 2 0 Compliant Native USB DAC compatibility with Windows XP Vista MAC OS 9 OS X and most Linux installs Other Features 19 XM5r6 v39 2008 Berdea DEVICES CORPORATION Practical DEVICES www practicaldevices com
5. SEK ka DEVICES CORPORATION XM 5 Headphone Amplifier XFeed Bass Treb 10dB 75Q XM5 eee A j NK DN A i Haie DEVICES EZ AS E urr v fy late GO N ET irra 499 a urr urr N l 4 User s Manual DEVICES PRACTICAL DEVICES CORPORATION Thank you and congratulations on your purchase of the XM5 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 XM5 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 KO 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 XM5 or any headphones get in the habit of removing the headphones from your ears whenever you e Turn the XM5 on e Connect or disconnect any cables including the USB cable e Turn your computer off on sleep standby with the USB cable connected e Press the USB select button on the back of the XM5 e Anything that may cause a sudden burst of loud
6. Type B 5 pin plug You may connect the XM5 through a USB hub if desired The XM5 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 Windows XP and Windows Vista Windows XP and Windows Vista have built in drivers to support the XM5 The first time you plug in the XM5 the drivers will automatically install 4 Found New Hardware x Your new hardware is installed and ready to use je Je Me ROH 5 46 PM Knoppix Wikip Y untitled Paint DEEP Tuesday You may have to choose the XM5 to be the default audio device Start gt Settings gt Control Panel gt Sounds and Audio Devices gt Audio gt Sound playback Default device If your media playing software Winamp Windows Media Player etc was running when you plugged in the XM5 you may have to exit and restart the media playing software Driver Support Linux MAC OS Most Linux distributions natively support the XM5 using ALSA Mac OS X and OS 9 also support the XM5 IMPORTANT Get in the habit of REMOVING YOUR HEADPHONES 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 XM5 s RearPanel switch e Connecting or disconnecting
7. d be oriented such that battery clip is toward FRONT of unit Fig 1 3 Battery cable is neatly underneath battery and circuit board Fig1 4 All 3 circuitboards in the correct slot Fig 2 5 Volume pot may catch edge of case Fig 3 6 Press on Faceplate to ensure circuitboards are inserted completely 7 Re install the two front screws Do not overtighten 8 Re install the rear panel Other Reassembly Hints Battery cable should be neatly under battery Fig 1 Note Make sure all THREE circuit boards slide in the correct slot DO NOT FORCE Fig 2 volume pot body may interfere with ithe metal case shown by arrow If so push on black bezel to allow pot body to clear Fig3 1 Don t put excessive force on the volume knob The pot is precision equipment and doesn t like to be manhandled 2 Similarly don t put force on the power button this can happen if the faceplate slips off during reassembly 3 Never try to remove the plastic pushbutton switch caps while the switch is in the IN position or you will break the switch 13 Battery Systems Your XM5 was equipped with one of the following battery systems 1 Lithium lon FastCharge System including a rechargeable battery and an AC adapter recharger 2 Alkaline battery 1 Lithium Battery FastCharge System If your XM5 came equipped with the optional Lithiu
8. l 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 100 to either left or right which can almost immediately cause listener fatigue Crossfeed corrects this by bleeding 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 6dB 100Hz Treble Boost 3dB 10kHz 2008 1638 Frequency response with GO Bass Boost enabled Sa IS 20Hz 200Hz Eda 20KHz IR tbe Frequency response with 446 Treble Boost enabled BB Ela 200Hz KHz 20KHZ Gain Boost With the volume knob at full your XM5 will deliver 12dB of gain Additionally you can enable the gain boost switch which will give you an extra 10dB of gain for a total
9. m lon rechargeable system just plug the charger into the powerjack on the rear of the XM5 e The battery will fully charge within two hours When charging is finished the LED on the charger will turn from red to green e The battery will charge even if the XM5 is turned on e You can leave the charger connected indefinitely e You can expect up to 40 hours of use per charge with no buffers installed e 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 2 Alkaline battery You CANNOT use any AC adapter whatsoever when using an alkaline battery 3 Lithium NON rechargeable battery You may use a 9 6V Lithium non rechargeable battery often used in smoke detectors These give extremely long battery life and slightly higher headroom from the higher voltage The downside is they are not cheap You CANNOT use any AC adapter whatsoever when using a Lithium non rechargeable Want to upgrade your existing alkaline unit to Lithium FastCharge Email us at sales practicaldevices com battery Doing so may cause device damage battery leakage or battery Pre Do not use any AC adapter with an alkaline or non rechargeable 14 overheating explosion or fire Frequently
10. not turn on or respond to pushing the power button e Battery is flat and needs to be recharged or replace 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 Headphone impedance is too low Use headphones with a higher impedance No Sound e Rearpanel audio source selector switch is set wrong Switch it 16 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 lf 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 original shipping Customer must pay for
11. of approximately 22dB 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 75Q Output Impedance You can insert a 75 ohm impedance at the output jack by pushing the 75Q switch a Switch OUT Normal mode Output Impedance DU Switch IN High impedance mode Output Impedance 750 Why would you want 75Q 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 XMS also acts as a battery tester When the XM65 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 To see the battery voltage if the unit is already on press the power button O The XM5 will warn you if the power falls below certain thresholds e At around 6 5 volts the amber LED will begin to flash e Below around 5 2 volts the amber LED will do
12. r is on Amber LED Flashes battery voltage when Power Button is pressed Low Battery warning Flashes 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 XMS Block Diagram cont Source Switch IN position Source is USB DAC OUT position Source is FrontPanel input Crossfeed Adjuster Turn this potentiometer to adjust the amount of Crossfeed from near stereo to 100 mono Power Connector USB Connector Used to power and recharge the XM5 Use Mates with Mini USB etn only the AC adapter supplied from Practical 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 Interior View Connecting Your XM5 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 XM5 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 Py E e GO Your headphones can have an impedance of 24 to 600 ohms 6 USB DAC To use the XM5 s USB DAC simply connect the XMS to your computer using the included USB cable The XM5 s RearPanel USB connector takes a Mini USB
13. the XM5 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 10dB 75Q XM5 Power Button LE FEN 9 DEVICES AOI SA i x A eo D de 5 a The power button functions are activated by pressing repeatedly within a three second window 1 press Turn unit on The AME 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 XM5 will not turn itself off Press and hold Turn unit off O 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 XFeed Bass Treb 10dB 750 XM5 a DS YJ I DE _ ber MO Q be in The XM5 s Active Crossfeed circuit simulates the sound stage of loudspeakers through your headphones e Press the Switch IN to activate Crossfeed 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 Al
14. uble flash indicating the battery is very low 11 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 remove the external power adapter if connected 2 Remove the two screws on the rear panel and Cn Day the two screws on the front panel using the te Ds gt bo included 7 64 hex key Note you do NOT dda to need to remove the volume knob a 3 From the rear push the circuit board and i board battery out the front of the case and battery 4 Using tweezers or a small flat screwdriver from rear gently wedge the chips out of their sockets Take care not to bend the pins of the chips See Figure 1 5 Insert the new chips also known as rolling the amp Make sure pin 1 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 What opamps and buffers can use See the Figure 2 Busbars installed faq on page 15 instead of buffer chips 12 Re assembling the Unit To re assemble the unit 1 Slide the unit together make sure the circuit board slides smoothly on the case s guide rails When sliding ensure the following 2 Battery shoul
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