15" Car Audio Subwoofer

[newbie2016]

Hello everyone,

I just got my DAYTON AUDIO DATS V2 last tuesday, i would like to ask, how can i measure the VAS of my subwoofer using the DATS. it keeps on telling that i use a bigger added mass.

thank you in advance.

 

[chris661]

Then do exactly that.

What's happening here is its measuring some of the parameters straight away. Some of those measured parameters (resonance, Fs, for example) are a function of others (moving mass, suspension compliance (which is related to Vas)). By altering the moving mass by a fixed amount, and then looking at the change in resonance, it can work out the original values of mass to compliance, instead of just a ratio.

For a 15" car sub, I'd expect you to need at least 50g of added mass. Maybe 100g.

Chris

 

[newbie2016]

I already did what was instructed in Youtube but I am still getting the same result. I'll be then posting the messages that were prompting.

Thanks.

Rean

 

[newbie2016]

 

[Josh Ricci]

Many high mass stiff suspension car subs require a lot of mass. My standard is 324g for example. I use nickel size ferrite mags from a hobby store. Attach front and back pairs magnetically attached through the cone. For best results with high mass drivers the cone needs to be horizontal and the driver should be clamped to a heavy object.

 

[Patrick Bateman]

Hello everyone,

I just got my DAYTON AUDIO DATS V2 last tuesday, i would like to ask, how can i measure the VAS of my subwoofer using the DATS. it keeps on telling that i use a bigger added mass.

thank you in advance.

Here's how I measure VAS:

Step one : I get a hunk of mortite about the size of a golfball
Step two : I weigh the mortite on a scale
Step three : I measure my speaker using DATS
Step four : I press the mortite onto the cone of the speaker and measure it again. Note that you have to input the diameter of the cone and the weight of the mortite in DATS

Using this method, I consistently get VAS measurements which match the spec sheet, and the entire process takes less than ninety seconds. I like my DATS so much I've bought three now. (I keep blowing them up.)

 

[Patrick Bateman]

Then do exactly that.

What's happening here is its measuring some of the parameters straight away. Some of those measured parameters (resonance, Fs, for example) are a function of others (moving mass, suspension compliance (which is related to Vas)). By altering the moving mass by a fixed amount, and then looking at the change in resonance, it can work out the original values of mass to compliance, instead of just a ratio.

For a 15" car sub, I'd expect you to need at least 50g of added mass. Maybe 100g.

Chris

It requires quite a bit. Last night I measured an 8" woofer (SoundSplinter RLI-8) and I had to add 154g of mortite.