Speaker wire loss calculator
So, who is right? What value is desirable? To find out we are discussing both points of view. From our point of view there is an additional aspect that needs to be considered: measuring the damping factor of a transistor amp is usually done at high outputs that's a least how Peter Strassacker always used to do it. At low outputs, however, most amplifiers i. When buying a conventional amplifier with damping factor of , it has to be expected that this value may drop to 20 at low outputs.
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SPEAKER CABLE
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Fire Alarm Speakers and Voltage Drop. Thread starter Shujinko Start date Apr 6, Shujinko Senior Member. Is there a limit to voltage drop allowed on a fire alarm speaker? What is the maximum voltage drop or minimum voltage allowed on a 25V speaker? Is there anything in NFPA 72 that addresses this or does the fire alarm speaker manufacturer set a limit on the minimum voltage required for the FA speaker to function correctly? I've never heard of a voltage drop concern on a constant-voltage audio line, which is what this sounds like.
The important thing is to not exceed the wattage rating with the total of the individual speakers. GoldDigger Moderator Staff member. LarryFine said:. Click to expand I have also never heard of, nor done, voltage drop calculations for speaker circuits.
Each speaker has its own transformer which is why you can tap them at different wattage levels. As an aside, why is someone using 25 volt speaker lines? Most of the big boys let you do 25 or GoldDigger said:. Indeed, the voltage drop is likely to be low enough to be ignored at the low line currents involved.
A 70 volt line installation will be less susceptible to voltage drop than a 25V line setup. But the higher voltage limits some of the things you can do running the wire. Usually there is enough available power from the amplifier that, if the voltage drop is large compared to 25V you can still get the required sound level at the speaker by using a higher wattage tap.
The sound output is linearly proportional to the electrical power into the speaker, so you can calculate the reduction in sound level from knowing the voltage drop. It is not something that the manufacturer normally specifies. Instead they give a sound output for a given voltage and wattage tap and let you decide whether that meets the sound level requirements of the applicable codes. Shujinko said:. The voltage readings in the field were measured at 9V at the last FA speaker in the circuit and at 14V at the circuit terminals at the amplifier side.
This is on a 25V system. That's why I am asking the question. This why I am asking the question in the original post. Location canada Occupation business. Calculating voltage drop is crucial for deciding whether or not your notification appliances can operate with the supplied head end equipment.
Almost all fire alarm control units operate on a 24 volt DC power supply. There are a few 12 volt DC fire alarm control panels. The calculations for NAC voltage drops are the same for these systems, however the cut off voltage for a 12 volt system will be roughly half that of a 24 volt system.
Location Cypress, CA. I do calculate dB loss with wire distance for all speaker circuits. Wire distance doesn't affect speaker circuits nearly as much as strobe circuits, but the calc allows you to keep tract of your wattage usage per circuit and per amp.
If you are driving an amplifier with a 25V line output to maximum output without clipping and are measuring only 14V, the amp is overloaded. The load resistance is too low, which corresponds to the sum of the output tap wattages being more than the nominal power output of the amp.
If you are not driving the amp to maximum output, you will not be getting the sound power output you calculated. Sent from my Pixel 4a using Tapatalk. You must log in or register to reply here.
Wire Gauge Calculator
When it comes to cable length, the shortest length possible is almost always better. No cable can do better than simply minimizing the amount of loss during that transmission, as there will indeed be signal loss as the electrons make their way through the conductors and struggle to jump the boundaries imposed by the connections at each end. Virtually every audio or video system is a set compromises. Many times a compromise can be equipment location. Whether it be furniture restrictions, room layout, traffic path or objections from the non-audiophile co-habitants, we work around those limitations as best we can, and often than means longer cable runs.
Fire Alarm Speakers and Voltage Drop
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How big should the damping factor be?
Calculating the treble cutoff frequency f c of a cable. Cable length or line length Calculation of the length of a cable at 3 dB treble attenuation. Capacitance C, frequency f, and capacitive reactance XC. Converting feet to meters and vice versa for U.
Speaker Wiring Calculator
Voltage Drop Calculator. We understanding how difficult it can be to track down specific information when you are ready to complete a project. Here you will find links to a wide range of topics used to educate and inform. Are you looking for ABYC standards? You'll find it here. Want to know the simplest way to order on this site?
Wire Gauge Size and Resistance Calculator
Many of the Belden cables featured in the Speaker Wire and Cable catalog feature high-conductivity copper conductors. These high-conductivity copper audio cables perform similarly to oxygen-free copper cables. They have a twisted, jacketed construction and are suitable for use in direct burial applications. White and black jacketed parts are sunlight resistant. With the exception of some 16 AWG cables, these speaker wires are for audio use only.
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CABLE LENGTH AND THE EFFECTS ON SOUND QUALITY
Using your current speaker and power wire, current amp power is calculated, allowing you to see any potential losses in Watts with undersized cables. We'll use data from the PVC to determine how much current your amplifier will draw from the vehicle's charging system. Efficiency, in amplifier engineering, a ratio of the amount of power produced by an amplifier to the amount of power put into it. Let's use Ohm's Law to calculate exactly how many amperes of current it will take to produce watts of input power at the following battery voltage:.
Calculate the diameter, cross-sectional area, and resistance of wire given its gauge or find the gauge of a wire given a diameter. Wire gauge is a standard unit for measuring the diameter of the wire and American wire gauge, or AWG, is the standard used in North America. The diameter and cross-sectional area of a wire can be found using the wire gauge and a few simple formulas. First — find the exponent in the equation by subtracting the wire gauge from 36 then dividing by Finding the exponent for 00, , and gauge wire is slightly different. Substitute -1, -2, and -3 for the gauge in the formula above instead of the AWG value. Third — multiply the value from the second step by either.
I planning to wire up four lengths of 12v WS led strings in a tree in my garden. I want to mount the power supply innside the house, so the cable from the power supply to the first led is about 10 meter. It's not just for the first LED. The power needs to be supplied to both ends of the strips and possibly in the middle as well.
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