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Home theater shack subwoofer test tones

Trevor Eaton. Hunter Warren. Resonance is a point in terms of frequency where the resistance provided by the inertia of the moving mass and that of the suspension are equal. That frequency is referred to as the resonant frequency, in the case of a ported box, this is called the tuned frequency, just for those that don't know that. Since resonance is the point where the two suspensions are equal, it's easy to say that it will mean at other frequencies they are not equal. Simply put, when you are above resonance, the port's suspension is dominant, and when you're below resonance the suspension of the sub is dominant, and the resonant frequency is where they become friendly.


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Trevor Eaton. Hunter Warren. Resonance is a point in terms of frequency where the resistance provided by the inertia of the moving mass and that of the suspension are equal.

That frequency is referred to as the resonant frequency, in the case of a ported box, this is called the tuned frequency, just for those that don't know that. Since resonance is the point where the two suspensions are equal, it's easy to say that it will mean at other frequencies they are not equal.

Simply put, when you are above resonance, the port's suspension is dominant, and when you're below resonance the suspension of the sub is dominant, and the resonant frequency is where they become friendly. If you're above tuning, the resistance of the air mass port is high due to the fact that the port isn't quick enough to react to the quick changes in direction.

This results in an inactive port and basically a large sealed box. This is gradual, not instantaneous, for a range of frequencies you still get a minor boost in output. At tuning, the port becomes active since it matches the resistance of the port matches the resistance of the frequency played inertia. It uses the speaker cone as a fulcrum for it's own output, and sucks energy through the internal air pressure and loads the speaker in the process. This means higher output, lower excursion for the sub since it's controlled heavily by the port's activity, and low distortion.

Below tuning, the port is no longer adding any significant amount of resistance and the suspension of the sub is higher at this point. While the inertia remains the same, as the excursion requirements become greater and greater at any given output level, the influence of the suspension increases, becoming more of a factor than the port.

The port is now a hole in a baffle and doesn't load the driver anymore, causing cancellation and sending the subwoofer to very high excursions due to the lack of control.

Why not tune to the lowsest frequency the sub can handle? In some cases 20hz or even down to 5hz.. Yes a low tuned enclosure would have "less lack of control" than a higher tuned enclosure, but it is entirely frequency dependant and that is based on the type of music and the frequencies in that music that you listen to.

In dolby digital home theater there is a lot of content in the low mid teens, star wars pod race scene, finding nemo glass tapping scene to name a few but in "popular music" low-mid teen content is relatively rare. Classical music on the other hand can have organ tones down to hz! Then you have the "bass" cd's that may have content that low. Otherwise most music does not go that low, so no real need to tune at 10hz, for music.

Posted on Saturday, June 11, - GMT yes thanks for the explanation jon i learned something intresting there. Like E said, music rarely drops that low, really it's rare for music to drop even in the 20s. Movie soundtracks are a different story, though. Anyway, in order to maintain control you need to keep the tuning frequency above the resonant frequency of the sub itself so that you don't lose driver damping within it's range, that is a factor that weighs in with the frequency you choose as most subs don't have an fs below 20hz, many don't even get that low.

Your basis is correct, tuning as low as you need to will add SPL at lower frequencies without adding a lot of stress to the driver mechanically. The main reason people don't do this in car audio is that they're looking for added SPL with music, and that means they typically tune in the 30s and 40s. Another limiting factor is that a 20hz tuning frequency requires a very long port, and more space, which is to another thing to be considered in a car.

Posted on Saturday, June 11, - GMT i have a question for you jon, it never got answeered in the let it out thread, what is the benifit of tuning your box closer to the res. Posted on Saturday, June 11, - GMT The car cabin resonates at a certain frequency, so you're tuning the enclosure to that so that you'll get even more SPL, since the car helps it out.

Like said above, cabin gain. To determine that, you take a speaker with a known frequency response in a large room preferably flat freq. The frequency that you get the highest SPL at is where your res. So like the eclipse subs that have fs of the low 20's can u actually tune to 22hz and it sound good? Posted on Monday, June 13, - GMT To find the resonant frequency of your vehicle, measure the frequency response of your subwoofer system, in open air outside of the car with no reflecting walls within 10 feet of the enclosure , use test tones starting with 35hz as a basis, use a good spl meter and take readings at 35,36,37hz and so on all the way up to 60hz in 1 hz increments.

Record your findings example 90db at 60, 89db at 59hz and so on. Now install place the subwoofer system in the vehicle that you want to find the resonant frequency, do the same test, only this time it will be in the vehicle.

Take note of the spl readings at 35,36,37hz and so on. Where there is the largest spl gain is where the resonant frequency lies, for example an 8db gain at 48hz over the "outside measurement" but only a 6db gain at 47hz, would mean that the responant frequency of the vehicle COUPLED with that enclosure lies somewhere near 48hz.

Now for base line tuning, you'll need to start with an enclosure tune roughly hz below the resonant frequency that you found earlier. Every vehicle is different, as well as placement, will determine a long way in how you do in competition placement within inches farther back in a suv for example can make a db difference. Port area also matters, the more port area the larger the gain, there are ports in competition vehicles that you can literally crawl in! It is said that a ported enclosure peaks at hz above tuning ie.

Keep building those boxes until you can achieve the highest spl reading you can. Now this does not work for a daily driver though, as your subwoofer system will be a somewhat "one note wonder" and will not sound good for your "streetbeats", some competitors "plug" the port holes for everyday music in effect making a sealed enclosure, but it is at best a poor solution, if you use the same woofers for comps as your daily driver, then use 2 different enclosures, one for comps and one for your daily driver.

There are exceptions to the rule but keep measuring and experimenting and you'll get it thats part of the fun of competition. Posted on Monday, June 13, - GMT oh and the beauty of the adjustable box is you could use it in the car and out of the car Posted on Monday, June 13, - GMT Very interesting, so if i know that my car Fs is around 65Hz, if i understood correctly i should tune my enclosure at Hz for the beginnin.

Ok to change port lenght is easy but what about if u wanna change the box volume? Posted on Tuesday, June 14, - GMT picture a box inside a box with the first outer box open on the back side and the second box open on the front side but closed on the back side and whallah. I think i'll try to build something like that to test it.

Posted on Tuesday, June 14, - GMT E explained it very nicely up there the only thing ill add is you could buy either a epic or with a built in spl meter and volt meter or you could do what i did before i knew about them and buy a radioshack digital spl meter for 50 bucks but they only go up to db and the epic and do db and db Posted on Tuesday, June 14, - GMT yw did it cost you to get metered and if you plan on buying the epic let me know i got a link to a site cheap well cheaper than the list price.

Posted on Tuesday, June 14, - GMT i just had an idea you could buy the epic and skip the handheld radio shack spl meter by just running longer wires so you could run it outside the car too lol Ghetto i know but it would work lol.


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Home theater calibration guide: Manual speaker setup


This article explains how to match the output voltage of an audio device to the input voltage range of the next device in the signal chain, and how to adjust input sensitivity to accommodate a variety of voltages from different source devices. Some background is provided as a prelude to the article. A decibel dB is a logarithmic ratio of two values. A decibel is a "dimensionless" value, meaning that it is just a number, not a unit. While decibels are most commonly associated with audio signals, they don't necessarily have to be. When they are being used to describe audio signal levels, they are often used to compare the amplitude of two audio signals. If those two signals are the same amplitude, then they are said to be 0dB apart.

Home Theatre set up level. 70 or 80 dB?

home theater shack subwoofer test tones

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If box is tuned to 35hz.. and u send a 50hz tone to it... what happens exactly?


On the market, you will find plenty of various models. Each of them provides various quality of sound, which may also depend on the price. By getting the best budget subwoofer, you will be satisfied with costs and quality. However, people often think that low price means poor quality. In fact, it is a bit different. If you are an audiophile beginner, you may not want to spend too much on the most expensive subwoofers.

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How to do a simple acoustic room measurement in your home studio or listening room — in 10 minutes or less! Anybody can do this — all you need is a computer connected to a pair of speakers. In about 47 seconds you will know how shitty your room sounds. Just listen and let me know if the volume of the test tone is perfectly consistent? Find a test tone generator in your DAW software. The frequency of the oscillator can be set. Turn the volume of your speakers fully down. Set the test tone generator or synth up.

It kicks out enough deep bass to shake your couch, it's easy to hook up, but it has enough power to work well in a modest home-theater.

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If you want to get the best out of your subwoofers and understand how to integrate them into your Home Theater system, you must have an SPL meter. You just won't believe how useful they are! Radio Shack Tandy in Australia make a cheap analog SPL meter, which is shown here, and the buzz amongst the subwoofer fraternity is that the analog meter is better than the digital one The only thing to watch is that it is not particularly linear at low frequencies, but it can be easily modified or manually corrected.. As well as his projects, he has some good info on speaker theory and a links section. After taking your measurements with the meter set to "C" weighting and "Slow" response, add the figure shown in this table.

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JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser. The system of Dolby Digital 5. But new home theater customers are often unsure if they have everything set up correctly.




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