Trying to design my own speaker.

[PV Audio 5,000+ posts]

Lol, no. I know I have no clue speaker design, but I do know the basic components used in crossovers and stuff, just saying that so he didn't have to do the basics of resistors and stuff.

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif I had thought I recognized your name, but wasn't sure. We just need ultimate157 in here to be complete //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

 

[PV Audio 5,000+ posts]

Oh shit son, battle of the EE students.

You're chem E, right?

 

[bose301s 5,000+ posts]

Bad link son

http://rapidshare.com/files/138350292/bose301s_design.zip.html

 

[PV Audio 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif @ the speedometer.

 

[PV Audio 5,000+ posts]

BTW if you like their designing, that's Bass Box and x-over pro that they're using. Lemme plug it in and check out the FR.

 

[PV Audio 5,000+ posts]

That shit is almost -12db down in aggregate regardless of it being 2nd order. After dinner, I'll try it with a Butterworth alignment to see if we can even it out to be a bit more seamless. As it stands, you're going to have a bit of emptiness around 1-4khz.

 

[bose301s 5,000+ posts]

Yea, I was told that it should be crossed lower, in the 2750-3000HZ range to avoid the woofers break up of 7500Hz being avoided and to not get too low on the tweeter.

 

[bose301s 5,000+ posts]

That shit is almost -12db down in aggregate regardless of it being 2nd order. After dinner, I'll try it with a Butterworth alignment to see if we can even it out to be a bit more seamless. As it stands, you're going to have a bit of emptiness around 1-4khz.

Yea, the emptiness is apparent. A butterworth or even standard may help it.

 

[PV Audio 5,000+ posts]

I'm looking at their design for the enclosure, and I don't know what sort of mill shop you own, but I sure as hell don't know how to cut something to 13.66 or 19.67 inches. I'll just use the enclosure they gave, then we can see if we can make it cuttable on your average saw //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[bose301s 5,000+ posts]

I have seen that a 4th order crossover may even be desirable for this design because the tweeter doesn't like to be crossed much lower than like 2500 and the woofer breaks up around 7500.

 

[PV Audio 5,000+ posts]

So that everyone else can see this shit too without downloading, this is what the initial graph looks like:

 

[PV Audio 5,000+ posts]

Okay bose, this is what she looks like using the same zobel but just moving the over point down 1khz on both to 2500 each.

I don't believe Mr. Linkwitz nor Sir Riley would want us to use their discovery on this project, but lemme tool around a bit.

 

[bose301s 5,000+ posts]

Yea, an LR isn't going to work here it appears. Try the butterworth.

 

[PV Audio 5,000+ posts]

Money. Check this out:

This is using a Butterworth alignment. Notice that in the x-over region, she doesn't even get to F6 for the overall plot. I'm going to try fiddling around a bit with a 3-way design to see if we can't get that passband up even a bit more, and if not, I'll see about using a -6db slope of the woofer and the 2nd order on the tweet still.

 

[bose301s 5,000+ posts]

Money. Check this out:

This is using a Butterworth alignment. Notice that in the x-over region, she doesn't even get to F6 for the overall plot. I'm going to try fiddling around a bit with a 3-way design to see if we can't get that passband up even a bit more, and if not, I'll see about using a -6db slope of the woofer and the 2nd order on the tweet still.

I've hear a single cap, 16.7mF on the tweet gives pleasant results. But as of now what you just posted looks good.