WHat should I do ?????

[THUMP LUMP]

I have a pair of A/D/S 320is 5 1/4" woofers that I use to use in my old car stereo days. These are the best sounding mid woofers I have ever heard in a car and would like to use them in the house. I have no T/S parameters for them at all. In the car they were electronically crossed at 2500hz and had their own amp as did the tweets. The two main questions I have are,

1) About what size of enclosure should I use? I would prefer going sealed.

2) I would like to passively cross these over to the tweet. How would I get these to cross at 2500hz without having an impedance curve or knowing what to use for a LCR circuit?

Here is the only info I have on them and is all I can find.



Thanks to all for the help.

[PeteMcK]

1: download ARTA: ARTA home
2: make this simple jig: AudioBlog: A simple loudspeaker measurement jig for ARTA
3: measure your speaker's parameters
4: download WINISD (or Unibox) : LinearTeam , and sim a box for your drivers
5: build it....

[THUMP LUMP]

That will work. Thanks.

[THUMP LUMP]

OK.....All good so far. Downloaded ARTA and built the jig. I now have T/S parameters and a impedance curve. Next question. I want to build a low pass 2nd order L/R crossover for the woofer. I have learned that it should be around 2500hz from previous apps. with this woofer. Should the x-over be built around the impedance at 2500hz or should I build a Zobel and build the x-over for 4 ohm?

One other thing that comes to mind.......can the ARTA software be used on tweeters as well? If so, any special considerations?

Thanks again.

[PeteMcK]

Hi Thumper, good to see you making progress, yes, ARTA can be used for the tweeter, the important thing to get there is the impedance curve & Fs.
Re: Zobels, this is a matter of personal preference; I prefer not to use them, use the impedance at the xover freq & tweak the slope if necessary, using zobels makes the component values easier to predict , but in general I would only use them if the driver has a very steep impedance rise. If your mid/woofers have a smooth roll of at the high end you should have no problem. (Others would, of course, do it differently...)

[THUMP LUMP]

Here is a screen shot of what I have



I would have to say that I don't think it rises very much at the 2500hz point. To me, it looks like about 7ohm.

I'm also thinking about doing the freq. response as well. Here is my problem with that. Since I don't have a proper room to do it right (aperiodic chamber?) I was thinking of doing it with them mounted in their new cabinets and placed where they will be used with the measurement mic placed where I would be sitting.

If your wondering, these are going to be used as nearfield monitors for computer recording. I am very familiar with the sound from these so there isn't any learning time as opposed to buying proper monitors. Against what many may say about recording monitors, the MOST important thing is to know them. And not that you can tell all your buddies that you just spent $2000.00 on a pair of Adam's

Thanks for the help, PeteMcK

[Old'n'Cranky]

I've just done the same thing to my ads al6's.
Also have to agree that the bass drivers are very nice.
Put mine into ~20ltr ported enclosures.
But then i also have the original passive crossovers to use.

Good luck.

[THUMP LUMP]

Unfortunately, the x-overs and the tweeters where already gone when I got these midwoofers at the car audio shop I use to work at. Lucky for me though, I got a great deal on just the midwoofers.

[THUMP LUMP]

OK...brain fart time for me. To add the capacitance of two or more caps together, is it series or parallel wiring? Example being, two 2.2mf caps to get 4.4mf.

The other brain fart is that I have to use non polar caps for low pass 2nd order Linkwitz/Riley,right?

[THUMP LUMP]

Never mind......I found/remembered the answers. Parallel and No.