GPA-400 stereo guitar power amp user manual
Contents
1. IS OUR PASSION Safety instructions DANGER Electric shock caused by high voltages inside Within the device there are areas where high voltages may be present Never remove any covers There are no user serviceable parts inside DANGER Electric shock caused by short circuit Always use proper ready made insulated mains cabling power cord with a pro tective contact plug Do not modify the mains cable or the plug Failure to do so could result in electric shock death or fire If in doubt seek advice from a regis tered electrician th mann MUSIC IS OUR PASSION Safety instructions CAUTION Possible hearing damage With loudspeakers or headphones connected the device can produce volume levels that may cause temporary or permanent hearing impairment Do not operate the device permanently at a high volume level Decrease the volume level immediately if you experience ringing in your ears or hearing impairment NOTICE Risk of fire Do not cover the device nor any ventilation slots Do not place the device near any direct heat source Keep the device away from naked flames th mann MUSIC IS OUR PASSION 10 Safety instructions NOTICE Operating conditions This device has been designed for indoor use only To prevent damage never expose the device to any liquid or moisture Avoid direct sunlight heavy dirt and strong vibrations NOTICE Power supply Before connecting the device ensure2. maximum range throughout the audience area Always use high grade cable to connect your equipment Otherwise you won t reach max imum sound quality For optimum results both impedance and power handling of the speakers must match the requirements of the amplifier Always follow the technical specifications of the speakers The overall impedance of the connected loudspeakers must not deceed the minimum output impedance of the amp The amps max RMS output power should be 50 above the power handling capacity of the connected speakers If you notice distortion during operation either the amp or the speaker is overloaded This may permanently damage the amp or the speaker Always reduce the volume when you hear dis tortion th mann MUSIC IS OUR PASSION 21 5 2 Additional useful tips Available operating modes Depending on the respective application the guitar amp can be used in various modes Stereo nur P Both power amp channels operate independently of each other each input CHA and CHB is amplified by Sim gt q one channel speakers are connected to both channels the volume for both outputs can be controlled sepa rately Mono 5 i Both amp channels amplify the input signal of CHA speakers are connected to both channels the volume gt for both outputs is controlled by the volume control CHA stereo guitar power amp 22 Installation and starting up O
3. that the input voltage AC outlet matches the voltage rating of the device and that the AC outlet is protected by a residual current circuit breaker Failure to do so could result in damage to the device and possibly injure the user Unplug the device before electrical storms occur and when it is unused for long periods of time to reduce the risk of electric shock or fire s B ST MUSIC IS OUR PASSION 11 Safety instructions NOTICE Magnetic fields The device generates strong magnetic fields that can interfere with the function of poorly shielded devices The strongest magnetic fields are directly above and below the power amplifier Therefore never place sensitive devices such as pre amplifiers radio transmission systems or tape decks directly above or below the power amplifier When installing the power amplifier into a rack you should place it in the lowest position and further equipment such as pre amplifiers in the highest position th mann MUSIC IS OUR PASSION 12 3 Features Features Maximum output power 400 W 80 Operating modes Mono stereo bridged Volume Resonance and Presence adjustable per channel Fanless operation s B ST MUSIC IS OUR PASSION 13 Connections and operating elements 4 Connections and operating elements Front panel 1 POWER ON OFF Main switch to turn the device on and off 2 VOLUME Volume control for channel A th mann 14 RESONA
4. Harley Geutou GPA 400 stereo guitar power amp th mann user manual MUSIC IS OUR PASSION Musikhaus Thomann Thomann GmbH Hans Thomann Stra e 1 96138 Burgebrach Germany Telephone 49 0 9546 9223 0 E mail info thomann de Internet www thomann de 27 07 2015 ID 319961 Table of contents wu WN W On AO Table of contents General information sss 4 1 1 Further information 1 2 Notational conventions 6 1 3 Symbols and signal Words sss 6 LC G TETE Ta YT TT 8 FS TT 13 Connections and operating elements STE 14 Installation and starting up 19 5 1 Tips on handling Spealers essen 21 5 2 Additional useful Tips 22 Technical specifications neee 24 Plug and connection assignMentt cccccccsessssscssssssssesseecssccesscceseecsnecsscessecssseesaeeseceesseceseeesees 26 Cal APM Gy e sak T E E E 28 Protecting the EnvironMent cccssscssscssseccssesssecssecesecsscsnscesssecescceseecssecesscessesceseesseecsneceseeesies 29 th mann MUSIC IS OUR PASSION General information 1 General information This manual contains important instructions for the safe operation of the unit Read and follow the safety instructions and all other instructions Keep the manual for future reference Make sure that it is available to all those using the device If you sell the unit please make sure that the buyer also receives this manual Our products are subject to a process
5. NCE Resonance control for channel A PRESENCE Presence control for channel A SIGNAL Indicator LED green This LED lights up when the device is turned on and a signal is present in channel A PEAK Indicator LED red This LED lights up when Channel A is overloaded by an excessive input signal BRIDGE Indicator LED yellow This LED lights up when the unit is operating in Bridged mode MUTE Switch to mute the device The white indicator LED lights up when the unit is muted PEAK Indicator LED red This LED lights up when Channel B is overloaded by an excessive input signal GPA 400 SIGNAL Indicator LED green This LED lights up when the device is turned on and a signal is present in channel B VOLUME Volume control for channel B RESONANCE Resonance control for channel B PRESENCE Presence control for channel B stereo guitar power amp Connections and operating elements Rear panel PE C e E wm 14 INPUTS Input sockets for channels A and B 15 Mono Bridge Stereo Switch to toggle between mono bridged operation via channel A and stereo operation via channels A and B 16 OUTPUTS CHA Output sockets for connecting a passive speaker box in mono or bridged mode channel A th mann 17 Connections and operating elements themann MUSIC IS OUR PASSION 18 Installation and starting up 5 Installation and starting up Unpack and carefully check th
6. at there is no transportation damage before using the unit Keep the equipment packaging To fully protect the device against vibration dust and moisture during transportation or storage use the original packaging or your own packaging material suitable for transport or storage respectively Establish all connections as long as the unit is switched off Use the shortest possible high quality cables for all connections th mann MUSIC IS OUR PASSION 19 Installation and starting up NOTICE Magnetic fields The device generates strong magnetic fields that can interfere with the function of poorly shielded devices The strongest magnetic fields are directly above and below the power amplifier Therefore never place sensitive devices such as pre amplifiers radio transmission systems or tape decks directly above or below the power amplifier When installing the power amplifier into a rack you should place it in the lowest position and further equipment such as pre amplifiers in the highest position Rack mountin The unit has been designed for rack mounting in a standard 19 inch rack it occupies one rack 9 unit th mann MUSIC IS OUR PASSION 20 Installation and starting up 5 1 Tips on handling speakers We recommend you to set up the speakers in a way that the sound signals can reach the audi ence unobstructedly It will often be helpful to mount the speakers on tripods Thus the sound will be evenly spread with
7. connect your valuable equip ment in such a way that a perfect sound experience is ensured Please note these advices because especially in Sound amp Light caution is indicated Even if a plug fits into the socket an incorrect connection may result in a destroyed power amp a short circuit or just in poor transmission quality Unbalanced transmission is mainly used in semi professional environment and in hifi use Instrument cables with two conductors one core plus shielding are typical representatives of the unbalanced transmission One conductor is ground and shielding while the signal is trans mitted through the core Unbalanced transmission is susceptible to electromagnetic interference especially at low levels such as microphone signals and when using long cables In a professional environment therefore the balanced transmission is preferred because this enables an undisturbed transmission of signals over long distances In addition to the conduc tors Ground and Signal in a balanced transmission a second core is added This also transfers the signal but phase shifted by 180 26 Plug and connection assignment Since the interference affects both cores equally by subtracting the phase shifted signals the interfering signal is completely neutralized The result is a pure signal without any noise inter ference 1 4 TS phone plug mono unbalanced 1 4 TRS phone plug stereo unbala
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9. n each output of the amplifier the overall impedance resulting from the individual impe dances of the connected speakers must not fall below the minimum allowable impedance of the amp s output If you want to connect multiple speakers to one amplifier output note the following S when connecting speakers in series the impedances add up S when connecting speakers in parallel the reciprocal value of the total impedance is equal to the sum of the reciprocal values of the individual impedances This means for example with two speakers with the same impedance In series connection impedance is doubled In parallel connection it s halved Detailed information on this topic can be found in our online guide Speakers www thomann de th mann MUSIC IS OUR PASSION 23 6 Technical specifications Output power Frequency range Input sensitivity Input impedance Signal to noise ratio A weighted Damping factor THD 24 2x50W 160 2x 100 W 80 2x 200 W 40 200 W bridged 16 Q 400 W bridged 80 20 Hz 20 kHz 335 mV balanced 20 kQ unbalanced 10 kQ gt 90 dB gt 80 lt 0 15 stereo guitar power amp Technical specifications th mann MUSIC IS OUR PASSION 25 Plug and connection assignment 7 Plug and connection assignment Introduction Balanced and unbalanced trans mission th mann MUSIC IS OUR PASSION This chapter will help you select the right cables and plugs to
10. nation of symbol and signal word indicates a pos sible dangerous situation that can result in minor injury if it is not avoided This combination of symbol and signal word indicates a pos sible dangerous situation that can result in material and environmental damage if it is not avoided Type of danger Warning high voltage Warning danger zone th mann MUSIC IS OUR PASSION Safety instructions 2 Safety instructions Intended use This device amplifies electric audio frequency signals to operate passive speakers Use the device only as described in this user manual Any other use or use under other operating con ditions is considered to be improper and may result in personal injury or property damage No liability will be assumed for damages resulting from improper use This device may be used only by persons with sufficient physical sensorial and intellectual abilities and having corresponding knowledge and experience Other persons may use this device only if they are supervised or instructed by a person who is responsible for their safety DANGER Danger for children Ensure that plastic bags packaging etc are disposed of properly and are not within reach of babies and young children Choking hazard Safety Ensure that children do not detach any small parts e g knobs or the like from the unit They could swallow the pieces and choke Never let children unattended use electrical devices th mann MUSIC
11. nced th mann MUSIC IS OUR PASSION 27 Cleaning 8 Cleaning Fan grids The fan grids of the device must be cleaned on a regular basis to remove dust and dirt Before cleaning switch off the device and disconnect AC powered devices from the mains Use a lint free damp cloth for cleaning Never use solvents or alcohol for cleaning th mann MUSIC IS OUR PASSION 28 Protecting the environment 9 Protecting the environment Disposal of the packaging mate rial For the transport and protective packaging environmentally friendly materials have been chosen that can be supplied to normal recycling Ensure that plastic bags packaging etc are properly disposed of Do not just dispose of these materials with your normal household waste but make sure that they are collected for recycling Please follow the notes and markings on the packaging Disposal of your old device This product is subject to the European Waste Electrical and Electronic Equipment Directive WEEE Do not dispose with your normal household waste Dispose of this device through an approved waste disposal firm or through your local waste facility When discarding the device comply with the rules and regulations that apply in your country If in doubt consult your local waste disposal facility th mann MUSIC IS OUR PASSION 29 Notes th mann 30 Musikhaus Thomann Hans Thomann Stra e 1 96138 Burgebrach Germany www tho
12. of continuous development Thus they are subject to change th mann MUSIC IS OUR PASSION 1 1 Further information On our website www thomann de you will find lots of further information and details on the following points Download This manual is also available as PDF file for you to download Use the search function in the electronic version to find the topics of koera each interest for you quickly 2 E ur online guides provi etailed information on technical basics Online guides Ouro guides provide detailed information on te alba and terms Personal consultation For personal consultation please contact our technical hotline If you have any problems with the device the Service E S S customer service will gladly assist you GPA 400 General information 1 2 Notational conventions This manual uses the following notational conventions Letterings The letterings for connectors and controls are marked by square brackets and italics Examples VOLUME control Mono button 1 3 Symbols and signal words In this section you will find an overview of the meaning of symbols and signal words that are used in this manual th mann MUSIC IS OUR PASSION Signal word DANGER CAUTION NOTICE Warning signs A A General information This combination of symbol and signal word indicates an immediate dangerous situation that will result in death or serious injury if it is not avoided This combi
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