Opinions on tuning

[kr15 5,000+ posts]

fs is an indication of where a sub would peak...an fs of 21hz is insane, meaning this sub is really built to nail lows...the higher above FS that you tune, you create a "peak" in your response, which sharpens the curve and limits a smooth response

 

[RAM_Designs 5,000+ posts]

Let's say a random sub has a fs in the 30-35hz area and works well in ported boxes. Tuning around the fs of the sub and using the right sized box will give you a fairly flat response curve. But as you tune higher you get a bigger bump in the curve, ie: peakiness, which is a common issue when tuning too high or using cheapo prefab boxes.

The same kind of pattern can be used with the XXX, but the fs is a good deal lower than your average car audio sub, so things start getting peaky at a lower tuning frequency than the random sub example I just used.

 

[06goat 10+ year member]

Speakerplans.com

Thanks a lot for that link, helped me out quite a bit.

 

[06goat 10+ year member]

Let's say a random sub has a fs in the 30-35hz area and works well in ported boxes. Tuning around the fs or the sub and using the right sized box will give you a fairly flat response curve. But as you tune higher you get a bigger bump in the curve, ie: peakiness, which is a common issue when tuning too high or using cheapo prefab boxes.
The same kind of pattern can be used with the XXX, but the fs is a good deal lower than your average car audio sub, so things start getting peaky at a lower tuning frequency than the random sub example I just used.

fs is an indication of where a sub would peak...an fs of 21hz is insane, meaning this sub is really built to nail lows...the higher above FS that you tune, you create a "peak" in your response, which sharpens the curve and limits a smooth response

Thanks for the help, I understand a little bit more now. So what would happen if I tuned a sub with fs of 35, at 35hz? The response curve would be completely flat, and thats what im looking for?

 

[kr15 5,000+ posts]

The response curve would be completely flat, and thats what im looking for?

I dont know that response is ever completely flat, but it would be relatively flat, meaning the slope off in both directions would be very soft and smooth. I prefer a flat response, and dont feel that a peak is ever good except for in dedicated spl vehicles...In a perfect box, the peak should be so soft, that the slope off blends it as if there is NO peak

 

[06goat 10+ year member]

Ok thanks again! helped out a lot

 

[RAM_Designs 5,000+ posts]

Thanks for the help, I understand a little bit more now. So what would happen if I tuned a sub with fs of 35, at 35hz? The response curve would be completely flat, and thats what im looking for?

It's not that simple as there are a lot of things that determine how a sub will act in a certain box. This is where box programs come in handy to get exact specs for whatever response you're wanting. You can eyeball t/s parameters and get a good idea of what the sub will work well in, but I use winISD to fine tune the box's response curve.

 

[RAM_Designs 5,000+ posts]

it would be relatively flat, meaning the slope off in both directions would be very soft and smooth.

The slope on the low end of a ported box is always 24db/oct though, just kinda depends on where it starts. Unless you're talking about in-care response, which a lower tuning does normally help in smoothing out since most vehicles peak somewhere between 40-60hz.