The configuration in Figure 4 is preferred over Figure 3 because it typically offers more SPL output. Recent research per "Sound Reproduction" by Dr. Floyd Toole indicates that 4 subs each corner loaded provides less frequency response variation and more overall output than placing each sub at opposing midwall locations. This is really a great option to ensure maximum gain with reasonably practical positioning. EQ can be used to flatten out any peaks in the response. Since speakers are minimum phase devices, flattening out a peak will take the energy out of the room and benefit ALL seats.
If you cannot place your subs in either of the above recommended configurations, do your best to use symmetry when pairing subwoofers like we show in the above illustration. Using our technique of crawling for bass is a good way to find the proper locations to place your subs. More advanced installers would benefit from using our subwoofer placement guidelines, to get more specific on choosing the appropriate locations for the subwoofers.
Before reading on, we recommend checking out our recently added YouTube Video discussion on how to connect multiple subwoofers to your AV receiver. For multiple subwoofer outputs on your processor If you have multiple sub outs which is a rarity right now but becoming more and more common on newer receivers , then your job is a little easier.
Simply connect an RCA cable from each sub out of your processor to each of your subwoofers. Next configure the layout in your processor if given the option.
For one subwoofer output on your processor If your processor only has one sub out connection, you will need a male to female y-splitter see Processor Y-Splitter picture below such as the Impact Acoustics Sonicwave 1-male to 2-female splitter. Next connect each subwoofer to the splitter via your RCA type subwoofer cables.
Choose quality interconnects that are well shielded and constructed. Again a great subwoofer cable choice would be the Sonicwave Series from Impact Acoustics. Most subwoofers that have two individual Left and Right inputs have one labeled mono or LFE and it is usually the left one. Unless the manufacturer specifies otherwise, simply use the Left input. Alternatively you can use a 1-female to 2-male y-splitter see Subwoofer Y-Splitter image below and connect the female side to the subwoofer RCA cable and the male sides to the respective left and right inputs.
The first thing you need to do is go into the bass management menu of your processor to properly configure your speakers and subwoofers. This is a good starting point. More advanced users can experiment with crossover points to improve the subwoofer to satellite speaker integration. If your receiver has a separate LFE setting, it's usually best to set it for Hz which will allow you to reproduce the actual full bandwidth of the LFE channel.
Speaker Distance Using a tape measure, note the distances from each speaker with respect to the main listening seat and write it down.
Enter this information for each appropriate speaker in your processor menu that relates to speaker distances. If your processor has multiple subwoofer outputs and independent level and distance controls, input the respective distances of each subwoofer. If your processor only has one subwoofer output or non independent trim settings for each, you will need to do a little math.
Take the average distance between each subwoofer and the main listening position and enter that distance into your processor using the following formula:. This is a staring point to try out. This should be repeated for the two or three most important seats in your theater room until you find the best setting that works reasonably well for all seats. Please note it is usually better to have independent delay control for each subwoofer. Speaker Level Using an SPL meter set to c-weighted slow response, place the unit point up at the ceiling at the appropriate ear height and location for the main listening seat.
Using the main front speakers as your reference channels, adjust the master volume until the SPL meter reads 75dB when the left front speaker is playing the test tone. BlueWizard Distinguished Member. Various pseudo-surround systems have been around for years. Most of them are a interesting gimmick, but most listeners rapidly tire of them and go back to straight stereo.
Spkr - ][ - Lft. Only signals that were not equal in the stereo channels would come through the back, and it was a nice effect, but again, it was just a gimmick, and I rapidly grew tired of it. Also, when the channels were very very close to balanced, the rear speakers would crackle slightly; it was annoying. As far as general front and rear stereo channels, I do this all the time. To some extent I do it so I can keep the overall volume level down and still hear well.
It works fine. My rear speakers are much smaller and much less efficient than my front speakers, but again, I don't expect much from my rear speakers, just a bit of sound fill.
One thing to consider is the position and orientation of your rear speakers. If you have your front speakers facing the rear wall of the room normal configuration and your REAR speakers facing the FRONT of the room, then then speaker are out of phase. That would make the front and rear speakers move in the same physical direction at the same time.
My speaker are sideways, so I haven't felt the need to reverse wire them. Again, it is not so much a question of whether the front and rear speakers should be equal, or rears less than fronts, or whatever, as it is, what you are trying to achieve.
If your goals are a room filled with music, then I would make front and rears very closely matched. If you simply want the rears to enhance the fronts a bit, then the rears can be smaller and less efficient.
The front and rears should be speakers of relatively equal quality, and similar tone characteristics but the rears can still be much smaller. You don't want to add crap rears to fantastic fronts; that sort of defeats the purpose. I'm still not completely convinced that ANY surround sound is anything other than a gimmick.
The answer is: it depends on the type of charger. In the popular press there have been a number of reports along the lines of "households wasting hundred of dollars on standby power". Being an inquisitive In this article, we look at composite video signal: what it is, what cables to use, where composite video is used and the problems Calculators Speakers in Series Calculator.
Jump Straight to Calculator The calculator below is useful in determining the total impedance of speakers in series. This calculator for amplifier power, voltage and current has little significance but is rather interesting. In the specifications for an amplifier, it might say This distributed speaker system SPL calculator takes the guess work out of which speaker tap to use.
It will tell you the correct power Jump Straight to Calculator This calculator will help you determine the cable losses in distributed speaker systems also known as volt or volt speaker systems Calculators Decibel Calculator for Audio voltage.
If you don't like formulas then you definitely won't like the formula for calculating voltage ratios expressed in decibels. So, use the following calculators to Here is a simple calculator for power, current, voltage and resistance actually there are 6 different calculators, use the one relevant to the values Calculators Power Usage Calculator.
Knowing the cost of running an electrical appliance is useful, and easy with this power usage calculator. You need to know three things: 1. Cost of These calculators will find how loud an amplifier and speaker combination will be, or what size amplifier you need to make a speaker a Calculators Lighting Costs Comparision Calculator.
Energy efficient LED lamps for lighting are very popular. They certainly cost less to run than conventional lamps. But how much do you really Calculators Speaker Dispersion Calculator. If you look at the specifications of speaker boxes, you should see something like Dispersion H x V : 90 x This is stating How much do you need to increase the gain of an amplifier to make it sound twice as loud: 3dB, 6db or 10 dB? Most countries have a stated maximum continuous noise level over a continuous 8 hour period a working day.
This is normally agreed to being Fundamentals Using a Multimeter. This article introduces the basic concepts of multimeters and explains how to use them for basic measurements. Multimeters are one of the most useful Fundamentals AC and DC. This article looks at some basic concepts and misconceptions of AC and DC electrical circuits. There are no formulas involved, just explanations to some Fundamentals The Dreaded Ohms Law. In a previous article we looked at the power formula, and discussed the relationship between power, voltage and current.
Having looked at the power Fundamentals What is Electrical Power? What is electrical power? What is the formula for electrical power? What is watts, volts and amps? This article introduces and illustrates these electrical Geoff reviews the Audioflow smart speaker switch which can be controlled through your smartphone or Alexa as they are Wi-Fi enabled.
Understanding Amplifier Power Understanding Audio. Understanding Speaker Sensitivity Understanding Audio. Understanding Speaker Impedance Home Speakers. Double amplifier power does not double the volume Understanding Audio. Understanding Acoustic Feedback Understanding Audio. Understanding Audio Frequency Understanding Audio. Understanding Decibels part 2 Understanding Audio.
Understanding Decibels part 1 Understanding Audio. Understanding Audio Levels Understanding Audio. Understanding Microphone Sensitivity Understanding Audio. Speakers in Parallel Calculator Calculators. Speakers in Series Calculator Calculators. Decibel Calculator for Audio voltage Calculators. Power Usage Calculator Calculators. Lighting Costs Comparision Calculator Calculators. Speaker Dispersion Calculator Calculators. Using a Multimeter Fundamentals.
AC and DC Fundamentals. The Dreaded Ohms Law Fundamentals. What is Electrical Power? How to wire Four Speakers to One Amplifier. By Geoff. Four speakers wired in parallel This diagram shows how to wire four speakers in parallel. It is the same as wiring each speaker directly from the amplifier, like this: Wiring speakers in parallel is not a good way of connecting three, four or more HiFi speakers as it puts too much load on the amplifier as explained in earlier article Four speakers wired in series This diagram shows how to wire four speakers in series.
Four speakers wired in Series-Parallel This diagram shows how to wire four speakers in series-parallel. Providing all the speakers are 8 ohms, this will work as the total impedance is also 8 ohms, While this will technically work, it is often not practical as you need lots of wires interconnecting all the speakers and there is no control over any one speaker — they all are controlled by the amplifier volume control at the same time.
Speaker Selector Switch The easiest and a safe way to connect 4 pairs of HiFi speakers is to use a 4 zone speaker selector switch.
They are normally good for lower powered speakers, and the resistor can get hot at high volume levels. If this switch is not selected, you have no protection when running all the speakers together. This is similar to the series-parallel wiring above, but it all happens in the box for you.
Speaker Selector with Volume Controls A more practical and a little bit more expensive way it to substitute the selector switch with a unit that also has volume controls. Remember to allow a volume control for the lounge room speakers so they can be controlled also. In-Wall Volume Controls Sometimes it is not convenient to have to go to the lounge room to control the volume of the speakers — especially if you are some distance away and the phone starts to ring.
You can use this method for 2 speakers, 4 speakers or more. Practical Considerations in Wiring Four Speakers The above installations will work, but they have some limitations. The best method for setting up a system with speaker volume controls is: turn all the speaker volume controls all the way up gradually increase the volume control of the amplifier until the music is just louder that you would normally want it.
This is the position for the amplifier volume control.
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