2 zone 70v amplifier wiring
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Amplifiers and Receivers
They are used extensively where multiple speakers are required. Distributed speaker systems are commonly used in airports, shopping centers, schools, churches, clubs, offices, car-parks, sports grounds and anywhere multiple speakers are required.
They can also be used in homes for background music systems. The basis of distributed speaker systems is similar to the way electricity is distributed. Power stations use step up transformers to distribute power as high voltage, which means low current, and therefore low line losses and thinner cables.
Distributed speaker systems use a similar principle. This allows the cable to be very long without having any significant line losses. Indeed at full output, the amplifier puts out volts RMS. Each speaker then has a transformer to reduce the volt line level down to normal speaker level.
This is because years ago, some states had laws stating that any cable with a maximum voltage greater than Volts peak had to be installed in conduit. This was time consuming and costly to install. So they developed a system where the output voltage of the amplifier was a maximum of Volts peak. This equates to The principle is the same as for volt line systems, but uses a maximum output voltage of 70 Volts. While 70 volt line systems are still the most common in the USA, some volt lines systems are being used.
Less common, but still seen on some amplifiers and speakers are 50 volt line or 25 volt line settings. The principles are the same for all voltages, but the lower the voltage, the more current, therefore the shorter the maximum cable length without significant line losses.
In practice, many commercial amplifiers and speakers have multiple taps. They may have and 70 Volts, or 70 and 25 Volts, as well as 4 ohm and 8 ohm outputs for normal speakers without transformers. Normally you should only use one output of a amplifier, that is, either the volt line output, or the 70 volt line output or the 8 ohm output, not all at the same time. Every speaker in distributed speaker systems needs to be connected to a step down transformer.
This converts the high voltage level down to normal speaker level. An 8 ohm speaker would be connected to the common and 8 ohm taps, while a 4 ohm speaker would be connected to the common and 4 ohm tap. Most transformers have a selection of input taps. The example in this picture has taps for 20 Watts, 15 Watts, 10 Watts and 5 Watts.
The feed cable is connected to the common and any one of the other taps. This allows the relative volume of the speaker to be set during the installation. For example the speaker in a high noise room might be set on 20 Watts, while the speaker in a small, low noise area might be set on 5 watts.
Alternatively, the distance between the speaker and the target audience might be different, so the speakers further away can be set at a higher power tapping or the close speakers at a lower power tapping.
To help in determining the correct tap for each speaker in every situation, see my SPL calculator for distributed speaker systems. All amplifiers designed for use with distributed speakers systems have a step-up transformer built-in. It is also possible to add an external transformer to an amplifier without an integrated transformer.
Simply use a speaker transformer in reverse — that is, connect the common and 8 ohm transformer connection to the common and 8 ohm speaker output of the amplifier.
Just make sure the amplifier and transformer are rated with enough power to drive all the speakers to be connected see Connecting Multiple Speakers below. As stated above, most amplifiers designed for distributed speakers systems have the output transformer built-in. Most 70 volt amplifiers or volt amplifiers also have an input mixer built-in.
This allows convenient connection of microphones and line level inputs. Ensure the model you use has sufficient inputs for your current needs, and perhaps some spare inputs for the future. For multi-zone systems, you can purchase an amplifier with 2 or 4 amplifiers and transformers built in the one box. Disclosure: If you buy through these Amazon links Geoff receives a small commission from each sale.
Any speaker can be used in a distributed speaker system, as long as a step-down transformer is used. Many manufacturers produce speakers with integrated transformers for use in distributed speaker systems. The speaker cable is normally connected directly to the transformer. To change the power settings you need to connect the speaker cable to a different transformer tap. In the speaker pictured, this is a simple matter of moving the speaker wire to a different terminal connector. Speaker boxes come in all sorts of shapes and sizes.
Many manufactures make a version of their cabinets with an integrated transformer. Connections are often by some form of speaker terminals. To change taps, simply rotate the switch to the desired power setting. Often these switches also have a position for 8 ohms bypassing the transformer — this makes them very versatile speakers for the installer. Horn speakers are very efficient, but not very good quality.
They are mostly used outdoors when coverage of a large, or high noise, area is required. For example in car parks, sports grounds, school yards and other outdoor areas. In the picture shown, the rear of the horn has a selector switch which needs a flat bladed screw-driver to operate. This is useful to reduce the likelihood of inadvertent changing of the settings after the install. This is the fun bit, because there is no need to calculate the total impedance.
To connect multiple speakers in distributed speaker systems, just wire them all in parallel and add up the total watts. Example 2: A small church has a small 25 Watt 70 Volt PA amplifier with 4 small speakers mounted in the church 2 down each side. They now want to add a speaker in a separate room for an overflow and creche area. As shown, it is easy to add the individual speaker watts together. This is much easier than calculating the total impedance.
This makes installation much simpler. Sometimes manufacturers of speakers designed for distributed systems only mark their speakers with the impedance of each tap, rather than the Watts.
Also, many impedance meters tell you the impedance, and you need to calculator the wattage. Distributed speaker systems are ideal for multiple speaker installations. They allow long speaker cables and calculation of the total load is easy. Distributed speaker systems are normally mono not stereo. They are mostly used for paging and background music situations. Although normally used for commercial installations, they can be used in domestic installations for background music systems.
Below are some of the major calculations used with distributed speaker systems you can stop reading now if you are not into calculations. The following calculations are for those who like to understand the mathematics behind the principles outlined above.
Several principles of distributed speaker systems have been outlined above. A mathematical explanation of each principle is now given under the following sub-headings:.
As an example, four 5 Watt speakers are connected together in parallel to a Volt line amplifier. The harder way which is why its not normally done is to calculate the impedance of one speaker, and then calculate the total impedance of 4 such speakers in parallel, and then calculate the total power. Now to calculate the total impedance of four of these connected in parallel:. Low and behold, that is the same as simply adding the speaker watts together — which is much simpler!
Example 1 : The total impedance of watts of Volt speakers can be calculated:. Now look what happens when that same 50 ohm speaker load is connected to the 70 Volt terminal of the amplifier:. Amazing, the same 50 ohm load draws watts of power on a volt line system, but only watts on a 70 volt line system.
Example 2 : The total impedance of 50 watts of 70 Volt speakers can be calculated remember 70 Volt line is actually Now look what happens when that same ohm speaker load is connected to the 50 Volt terminal of the amplifier:. This principle is very handy to the installer if the power required by the speaker load is greater than what the amplifier can deliver.
Simply move to the lower line voltage speaker connection on the amplifier and the power drawn is halved. The maximum power to each speaker is also halved, so the speaker output is halved, or reduced by 3dB, but the amplifier will not be overloaded. In the examples above we saw the speaker impedance of distributed speaker systems is reasonably high.
For example a 5 watt speaker on a Volt line has an impedance of 2, ohms. Even a Watt load of Volt speakers is 80 ohms. So imagine the load if the total impedance is only 8 ohms.
It should be 10 times the load right? This scenario can be calculated:. This site uses Akismet to reduce spam. Learn how your comment data is processed. Contact Geoff: geoffs geoffthegreygeek. Sign in. Log into your account. Forgot your password? Privacy Policy.
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Amplifiers
Deliver high-quality, professional audio to up to eight stereo zones. The Triad 4-Zone Power Amplifier is a high-performance, whole-home audio amplifier that provides high-resolution music playback in a compact form factor—the perfect solution for distributed audio systems. Designed around time-tested and reliable ICEpower technology, the 8-Zone Power Amplifier delivers watts per channel of high-resolution audio. The Triad 1-Zone High-Power Amplifier delivers high performance, reliability, and robust amplification in a compact form factor providing the perfect solution for distributed audio systems. Fast wake-from-standby time and high-resolution audio quality output make this amplifier worthy of any audio solution. The Triad One is a single-zone, high-resolution streaming amplifier and the easy way to add music into any room of a Control4-enabled home without the need to pull wire back to a central location.
Mixer/Amplifier
Good sound belongs everywhere - in the hotel lobby, in conference rooms, in schools and houses of worship. Demands are constantly increasing, not only in terms of quality, but also in terms of flexibility. Permanently installed and still flexible? The IPA T is a professional, four-channel installation power amplifier with 4 x watts. The versatile DSP functions include, amongst others, a parametric EQ with matching speaker library, dynamic tools, a matrix mixer, priority source selection and delay. Despite this range of functions, the IPA Series power amps are easy to operate. Important functions such as signal, limit, protection and bridge mode are easily visible via the LEDs on the front panel. The back-panel slot provides expansion card connectivity for additional future-proofing. The Ethernet card offers comprehensive configuration and management via software. Times are changing; rooms are redivided or rededicated, numbers of attendees increase or decrease based on unforeseen events, but with the IPA Series DSP-supported power amps, your installation is prepared for any situation.
Shop By Brand
Constant-voltage speaker systems refer to networks of loudspeakers that are connected to an audio amplifier using step-up and step-down transformers to simplify impedance calculations and to minimize power loss over the speaker cables. Systems like this have been around for nearly years and were invented in response to the need for large public address installations that required a large number of loudspeakers. These systems use higher voltage and lower current to distribute the signal using lower gauge wire. In Canada and the US these systems are most commonly referred to as volt systems. Few systems are as misunderstood as "70V" systems.
FreeSpace IZA 2120-HZ integrated zone amplifier
The AAPHD is ideal for conference room presentation audio, and commercial paging and background music. Connect to the optionally purchased WPD-RISRL and you now have a remote wall plate that works up to ' away from your amplifier, this wall plate allows you to select your input and adjust the volume. What is unique to the AAPHD mixer amps from Atlas Sound is that they have push to touch diagnostics by checking the connected speaker lines for wiring and impedance errors, this makes setting up and troubleshooting easier than ever. This test can be activated once all speakers are connected and the circuit automatically verifies that the attached speakers' tap settings do not exceed the amplifier's rated power, no speakers are mistakenly tapped at 8ohm, and the speaker wire is free from shorts. Additional features include a rear panel DIP switch that allows for creation of Zone 2 output using either or all of input 1, 2, 3, or input 4. The unit can also be set-up to mute inputs 2, 3 and 4 based on signal from input 1 for paging applications where other input sources need to be muted during a page.
Constant-voltage speaker system
Adaptable with Ohm loads; suitable for small to medium sized meeting rooms. Bridged mode W output for 70V or V loudspeakers direct drive. Selection for power-up mode, standby mode, and trigger mode. Switch for High Pass Filter to reject the frequency below 80Hz, avoiding the damage to loudspeakers. Equipped 12VDC terminal block for remote detection and control. Optional accessory card slot for Dante receiver.
Constant-voltage speaker systems refer to networks of loudspeakers which are connected to an audio amplifier using step-up and step-down transformers to simplify impedance calculations and to minimize power loss over the speaker cables. They are more appropriately called high-voltage audio distribution systems. In Canada and the US, they are most commonly referred to as volt speakers.
Almost everyone has hooked up a speaker to an amplifier. Two wires from each speaker to two terminals on your amplifier or receiver. If this was in your home, you probably didn't think about how far this cable would go. Likewise, you probably didn't think about how much power you were losing on the cable. The table below is from the Belden website and shows how far you can go before you get to a specific loss. But you'll notice a third section there, titled 70V volt speaker.
JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. Call Now for Fast, Friendly Service Rockville is proud to introduce our new RCS series of products. This amplifier is capable of 70 volt, volt, 8-ohm, and 4-ohm applications. This model offers watts at 70 volt and you can either use the binding posts for single zone applications or use the speaker wire outputs and split the power up to 6 zones.
This revolutionary award-winning amplifier is designed as a two-channel amplifier using class D amplifier technology. It can be used for powering low impedance stereo systems with a maximum power of 2 x 40 Watt, while bridging to a constant voltage V and 70V is possible with a maximum output power of 80 Watt. A switch-mode power supply allows a wide variation of main voltages for global compatibility.
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