I'm looking to get the Pioneer TS-W254F, a 10" Free Air Sub. I noticed that the frequency response is 18 - 2500Hz. Is it high because its a free air or does this mean it's not a true bass? Will such a wide range in frequency prevent a nice deep thump?

Thanks!!

-Rich

 

Don't let the sub play those high freq., put a coil on it to get rid of those. Let it play from 100 hz and down.

That freq range is just specs for the driver. A lot of subs have bands like that. The one you are concerned about is the lower one.

 

Well I can accomplish the same thing using a crossover right? I get the most dB between 50 and 1000. So if I set the crossover to about 200 life should be good right?!

 

A coil is a low pass filter 6dB/Crossover. You just have to buy the right coil to block the upper frequency. Here is a link to a website that will help you calculate the correct coil size.

http://www.the12volt.com/caraudio/crosscalc.asp

I would recommend about 100Hz not 200Hz. The Sub will do much better only having to reproduce those frequencies.

 

This is 100% correct...try to stay around the 100 hz piont. The higher you go, the more directional the sub becomes. This means that you will start hearing where these freq are coming from. With the 100hz and below, you will only feel those freq.

 

So which freq do I need to input into the formula. Since there is a range of frequencies I need to block how exactly do I do this!

Once I determine the type of coil I need, where can I get it from? Sorry but new to this!!

Thanks for all your help!!

-Rich

 

Hey mattrush78,

Thats a great website....makes it real easy to make your own passive x-over networks. When I was doing systems I had to use my calculator!!

You should post that for everyone to see.

 

Are you just going to be running one sub?? What is the ohm load of the sub??

On the website I posted you first put the ohm load in the ohm load box and put the freq for which you would like to block in the freq box. Then press the equal botton and read the first line of the calculations for the coil size.

I hope this helps.

 

That's not the part I'm not understanding. Since there is a range of freq I want to block, what do I do once I determine the coil sizes to block them?

I'm running 1 4ohm sub!

 

What you are make is called a low pass filter/crossover. This kind of filter/crossover starts blocking frequencies by the size of the coil. So if you use a coil size of 6.36639mHy then you will start block frequencies at 100Hz on a 6dB slope. So basicly your sub will only recieve for 100Hz on down. Here is a other link that I think you help you undrestand. http://www.the12volt.com/caraudio/cross.asp#lp

Matthew

 

I see now!! I was missing the fact that you choose a point to start filtering from and that the coil will filter anything beyond that point.

So now how do I actually implement this?

Thanks for your help and patience!! LOL

Like I said before, new to this stuff!! I have an EE degree so I understand what your talking about, just not sure how to apply it in this scenario! I guess thats when happens when you start working in the IT industry after graduation and don't have a chance to apply what you've learned!!

 

Just put the coil in serial with the positive speaker wire lead.

Put one end of the coil on the positive speaker lead terminal of your sub, and the other end of the coil on the positive speaker wire going to your amp.

Solder or crimp these together. You may have to scrape the ends of the coil for a good connection. They usaully have a coating on them.

 

Gotcha!! How much and where can I get the coil?

 

Less then 10 bucks and any electronic parts store. Should have a lot in NYC. Just look in the Yellow pages under electronic parts or even speaker parts, and call around for that coil size.

 

Thanks again for all your help fellas!!! Really appreciate!! Hope I can return the favor sometime!!!

-Rich

 

That not a problem. I'm glad I coould help you out!

Matthew

 

Is this for a car sub, or are your building a speaker, or is it a home sub? If it's for a car, don't even bother with the coil. Get an amp with a built in X-over, or low pass filter. Alot easier. If it's for home, then yeah a coil should work, at only 100hz down. Ideal would be about 80 though.