Jump to content
onebadmonte

Impedance Curve, what's it do for sound quality?

Recommended Posts

Howdy all. I've got a little time on my hands and have a couple of widgets at my disposal. I'm running Stevens Audio Full Body horns in my ride and have a few compression drivers to try out. The compression drivers I've collected so far are the Stevens Audio Pro Drive, Dayton Audio D250P-8, and the DIY Sound Group DNA-360. I've head them here and there, but not long enough to decide which are the best for me. I've got one of those Dayton Audio DATS thingies, so I decided to test out my compression drivers and see what the impedance curve looks like with and without the horn body. I figure I'd share them and spur some discussion on how important the impedance curve is regarding sound quality.

Lets start off with some measurements of the drivers without the horn.

Up first is a compression driver making a strong showing in the home theater scene, the DIY Sound Group DNA-360.
dna360raw_zps9ff75e0b.jpg

Here is the DNA-360 in my scientific testing lab.
CAM00750_zpsqrzv1pkp.jpg

Up next is Dayton Audio's offering the D250P-8
daytonraw_zps940066fb.jpg

The Dayton driver going through the ringer.
CAM00749_zpsqnutavkb.jpg

Lastly the Stevens Audio Pro Driver.
prodriverraw_zps2975cfe6.jpg

The Pro Driver being tested.
CAM00748_zpsvwi62oiz.jpg

Now lets see the drivers tested with the horn body installed.

First up is the DNA-360. This is what it looks like on the horn body.
CAM00743_zps2aovn3g8.jpg

Up close of the DNA-360 driver.
CAM00744_zpsjzt2iqbd.jpg

Here is the setup in the testing facility.
CAM00746_zpsdbfmf9jz.jpg

This is what the DATS had to say about the DNA-360 in the Stevens Audio Full size horn body.
dna360horn_zps0be33d47.jpg

Up next the Dayton D250P-8 installed on the horn.
CAM00735_zpsdo8uscyp.jpg

Here is a close up of the D250P-8.
CAM00737_zpssvvozgzf.jpg

This is the Dayton driver getting tested.
CAM00747_zpsz50wkuxs.jpg

Here is what the Dayton D250P-8's impedance curve looks like when installed on the Stevens Audio full size horn body.
daytonhorn_zpsd6d0903a.jpg

Lastly the Stevens Audio Pro Driver on the horn body.
CAM00738_zps6lfkn7j9.jpg

Up close and personal with the Pro Driver.
CAM00739_zps7imfaur1.jpg

The Pro Drive getting it's turn through the test rig.
CAM00741_zpsljyot9lt.jpg

The results of the Pro Driver.
prodriverhorn_zps19a604c4.jpg

For shits and giggles here is my Electro Voice DH1A driver on a AutoTech 350Hz Tractrix Horn body going through the test rig.
CAM00751_zps1qswyzsv.jpg

The results of the EV.
dh1ahorn_zps8832d813.jpg

tongue.png

Here are some side by sides of the D250P-8, DNA-360, and the Pro Driver.
CAM00754_zps1adhortv.jpg

Any thoughts?

Share this post


Link to post
Share on other sites

um, nice collection@!

Share this post


Link to post
Share on other sites

 you have no idea.. when you look up audiophile in the dictionary .... there is a picture of hugo!

Share this post


Link to post
Share on other sites

I envy your collection of compression drivers. I know you say you dont know which one is best for you, but any pros and cons between the three?

Share this post


Link to post
Share on other sites

Sound quality is a net result influenced by factors sure, but as with any compromise in car audio you deal with it. Much better to start looking at published impedance curves and frequency response charts that were acquired on a turntable if you want to garner some insight.

Share this post


Link to post
Share on other sites

 

I envy your collection of compression drivers.

Same Here !!!

Share this post


Link to post
Share on other sites

Thanks for chiming in dudes, I appreciate the complements. I'll throw up some more info as soon as I get a chance. :)

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×