This calculator requires the use of javascript enabled and capable browsers. The click on calculate for the required power calculation. Use this calculator to determine how much power is required for your 70 volt. The 4 main speakers in the sanctuary are 8ohm 15inch speakers, running off a separate stereo power amp which sees 4. Jan 27, 2014 70v amplifier power and speaker taps a 70v high impedance speaker will only deliver its rated tap setting power level if the amplifiers master level control is set to 100%, full output. These are commercialgrade products so you wont find one at a hifi or home theater store. Bogen communications is a leading manufacturer and designer in the field of telephone paging, public address, intercommunications, and background music systems for over 80 years. The central unit of a 70 volt system is the amplifier that boosts the sound signal to be distributed to preestablished speakers or paging horn loudspeakers. With high output power, versatile loading options, high thermal capacity and reliability, the cx series is the ideal solution to any permanently installed sound system. Commercial 70v audio mixer amplifiers bogen paging. A line or auxiliary output from your main mixer connects to an auxiliary input on the distribution amplifier to feed the sound into it.
To use it, enter the quantity of speakers, the the wattage power tap used. Actually, all you need to design a proper paging system is a few simple measurements. Understanding distributed speaker systems geoff the grey geek. The basic components of a 70 volt system are 1 an audio source, 2 a 70 volt amplifier, never hook up 70 volt speakers to a residential 8 ohm amplifier. Because this amplifier has so much gain i have inserted an adjustable attenuator between the signal source and amplifier. One advantage of a 70volt system is that it allows long lines of speaker wire to be run without signal loss.
Mar 24, 2017 this is the pcb layout for 400w pawer audio amplifier. The ra170 mono power amplifier was designed especially for the installation contractor, and is housed in a single rackspace unit with a choice of either an rca coaxial or 14 ts phono unbalanced input. Use logic when determining how much power requirements you can place on the amp. This distributed speaker system spl calculator willl help you design a 100volt or 70volt speaker system by calculating the transformer tap required for each. Bose professional by continuing to use this site, you accept our use of cookies and other online technology to send you targeted advertisements, for social media, for data analytics and to better understand your use of our website. Which transformer tap will feed 10 watts to a loudspeaker with a 70v transformer. A stepup output transformer in the amplifier provides the high. This amplifier supports many advanced features which make it a perfect fit for most applications noise reduction audio systems installed in commercial environments are susceptible to noise caused by an electrical ground loop.
Using 70 volt audio transformers for impedance matching tube. For example, you can calculate the difference in db between two amplifiers. The idea behind 70 volt and perhaps more common in the uk, 100 volt line systems is that you have an amplifier that puts out 70 volts at maximum output which for arguments sake is say 120 watts rms. Bose professional develops innovative pro audio solutions for all venues and spaces. A handy tool for measuring constant voltage sound system. A series of audio calculators that sound system designers, engineers, and. If connected to the 70 volt line speaker terminals of a 40 watt 70 volt amplifier, the amplifier will be overloaded. The component part list, pcb layout design and component placement layout is provided in this post. Nov 05, 2016 however, if you choose an amplifier designed to drive a 70 volt line or put a transformer on the output of a low impedance amplifier and attach a matching transformer to each speaker, you create a constant voltage system thats isolated from the combined speaker load impedance. The pa1001g power supply supports 120240vac power for global use and operation. From here, any time that you want to add a speaker, you need to have another transformer that allows you to connect to the 70 volt signal line, and then. Use this calculator to determine how much power is required for your 70 volt amplified speaker system. The syscomp has a maximum input voltage of 50 volts peak. Usually have one common lead and multiple primary leads on the primary side input usually two leads on the secondary output, but may have several, i.
Many commercial pa amps include builtin mixers, which make installation and operation supereasy. That is why a plastic cover is over the audio transformer output terminals of this amplifier, to reduce the risk of shock. There are power amplifiers, which are rackmountable and have no external controls, and packaged amplifiers, which have preamp. In the 70 volt paging amplifier configuration, each. The rolls ra170 power amplifier was designed especially for the installation contractor. This amplifier supports many advanced features which. Parts express stocks all of the commercial installation amplifier products, including accessory rack kits. The crown cdi is a twochannel amplifier that offers 500 watts per channel. This amplifier supplies 50 watts of power, 25 watts per channel, and is built to an industry standard 2570 volt design. Amplifiers from bogen, qsc, speco, australian monitor, yorkville and more.
Twochannel, 400watt power amplifier designed for use in commercial installations where high output is required. The 70 volt speaker outputs are provided via springloaded terminals and. These amplifiers can be easily rack mounted and are also ideal for paging, playing music or for prerecorded messages. The 100w into a 70v or 100v distributed system gives the power to meet most amplifier demands. Powermatch pm8500pm8500n power amplifiers bose professional. In wall mount 70 volt amplifiermixers click picture for data sheet add to cart mfg. Dale pro audio carries a wide selection of 70 volt amplifiers from top brands such as crown, jbl, qsc, lab. When setting up high impedance speaker systems, adjust the final required volume level using the. Number of speco technologies 70v speaker per amp note. The patent pending through hole chassis design makes it. Transformers are used at each speaker location to convert from the 70 25 volt system to the speaker impedance eg 8 ohms. For further information on distributed speaker systems often called 100volt or 70volt speaker systems see my article on understanding distributed speaker systems.
Distributed speaker system spl calculator geoff the grey geek. This is the pcb layout for 400w pawer audio amplifier. Transforms 70 volt signal down to 8 ohms, or high voltage and low current to low voltage and high high current. First, you need to buy an amplifier that has a 70 volt output. Apparently 70 volt can give you quite a shock even compared to 120 volt ac due to the high frequency components of audio signals. This is an amplifier which is used to power all the distribution speakers. Please refer to the connection image in the end of this post. The second thing is that you will need to buy a special transformer for every speaker running off this system. A 70v output is available on bogen amplifiers and is the primary type of output for paging systems. The 70 volt speaker outputs are provided via springloaded terminals no transformer is required for speaker connection. Extron provides a series of audio calculators that sound system designers, engineers, and technicians frequently need to access, such as determining amplifier power requirements, converting between dbu and dbv or volts, or estimating the.
Speaker 70 volt powered line calculator csgnetwork. All of the speaker locations come from this same 70 25 volt line. The ra170 is a single rackspace, mono unit with a choice of an rca or 14 unbalanced input. Perfect for light commercial applications, these episode 70v mixeramplifier include all the features needed for background music and paging. Distributed speaker system spl calculator geoff the grey.
Jason from direct pro audio explains 70 volt amplifiers, 70 volt equipment and 70 volt speaker systems. Bose professional by continuing to use this site, you accept our use of cookies and other online technology to send you targeted advertisements, for social media, for data analytics and. Monoprice commercial audio 240w 5ch 10070v mixer amp with. In europe, the 100 v system is the most widespread, with amplifier and speaker products.
The cx1202v 70 volt 2 channel power amplifier is designed to meet the specialized needs of sound contractors. Constant voltage 70 volt audio systems for beginners highimpedance loudspeaker distribution audio distribution systems, especially those commonly used in department stores, warehouses, around race tracks, etc. Presumably this means 100 volts peak to peak but the 70 volt line output has a peak value of approximately 100 volts. This is the schematic design of 400 watt 70 volt amplifier capable to deliver about 400w rms power output in single channel. How to use 70 volt amplifiers and 70 volt speakers youtube. Compact mini home power amplifier 40w smart small audio stereo receiver w aux, 2 microphone in, com8ohm25v70v speakers, led, input selector, for pa, amplified speaker sound system pyle pcm20a, black. If connected to the 70 volt line speaker terminals of a 40. The power amplifier provides 70 watts of power when connected to a 70 volt speaker system. In canada and the us, they are most commonly referred to as 70volt speakers. The 70 25 volt line from the amplifier is applied to the input of the transformer. It is done by having the output of an audio power amplifier connect to a transformer and the signal is converted to a higher voltage approximately 70 volts hence the name of the system.
Use this link to give you an edge on your youtube competition. However, if you choose an amplifier designed to drive a 70 volt line or put a transformer on the output of a low impedance amplifier and attach a matching transformer to each speaker, you create a constant voltage system thats isolated from the combined speaker load impedance. This calculator provides the required electrical power power output from the amplifier to produce a desired sound pressure level spl at a given distance, along with an amount of headroom to keep the amplifier s out of clip. The 70 volt speaker outputs are provided via springloaded terminals and no transformer is required for speaker connection. The input selected is based on the maximum power needed from the speaker.
The 4 main speakers in the sanctuary are 8ohm 15inch speakers, running. They feature eight inputs for microphone and stereo hookups, an integrated mixer that provides expert blending, xlr microphone inputs with independent priority modes that enable audio ducking, and. The power supply module already included ini the pcb design. Pdf design and construction of a 300 watt audio amplifier. One advantage of a 70 volt system is that it allows long lines of speaker wire to be run without signal loss. Extron provides a series of audio calculators that sound system designers, engineers, and technicians frequently need to access, such as determining amplifier power requirements, converting between dbu and dbv or volts, or estimating the loss in sound pressure level with an increase in distance.
Connect the same speakers to the 70 volt line terminals of the same 120 watt amplifier and the amplifier will only see a load of 100 watts. This amplifier features an ultra compact design requiring only 1ru in height and 1. Search for criteria selection all of the words any of the. Constantvoltage speaker systems are also commonly referred to as 25, 70, 70. This amplifier supplies 50 watts of power, 25 watts per channel, and is built to an industry standard 25 70 volt design. If you need help in using the calculator, below is an explanation of all the fields and some user tips. You are designing a system where the farthest listening position from the loudspeaker is 100 meters. For further information on distributed speaker systems often called 100 volt or 70 volt speaker systems see my article on understanding distributed speaker systems. The simulated closedloop gain was 10vv which also agreed with design specifications and analysis. Mar 30, 2012 jason from direct pro audio explains 70 volt amplifiers, 70 volt equipment and 70 volt speaker systems. When setting up high impedance speaker systems, adjust the final required volume level using the tap settings of the speaker. Dual voltage and current feedback loop proprietary design combines classd efficiency with a unique current and voltage feedback loop circuit that continuously. Ovrc and control system integration make management a breeze.
The power supply is already included in the printed circuit board although in the schematic design, the power supply was not included. The patentpending network audio configuration can use 70 volt paging amplifiers and speakers to create an efficient and lowcost multizone system for scheduled audio for school bells, factory bells, storefront announcements, medical applications, music distribution, and more. The total watts of all the 70 volt speakers totals 50 watts. May 11, 2017 5 of the speakers are mono such as in classrooms, on a 70 volt amplifier.
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