crossover design

[qts1@hotmail.com]

i want to built a crossover using the following drivers:

<A HREF="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-578">http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-578</A>

<A HREF="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=294-650">http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=294-650</A>

<A HREF="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=299-392">http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=299-392</A>

[Pete Schumacher ®]

[qts1@hotmail.com]

MYBAD!!!!!!!!!! lol but what i wanted was some help, i tried reading up on crossovers but i just don't get it. any help???

[mikebw]

Well, you might get some more support if you look up a crossover design program and post your results. I have not personally used such a program, so I can't really help you out there, but it seems there are many people here who have some experience with that so do some searching any try to ask specific questions.

Generally, it is best if you can say what kind of speaker you are trying to build, that is- what are you going to use it for? What is your budget? etc...

> i want to built a crossover using the
> following drivers:

>
> <A HREF="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-578">http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-578</A>
>
> <A HREF="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=294-650">http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=294-650</A>
>
> <A HREF="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=299-392">http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=299-392</A>

[Pete Schumacher ®]

> MYBAD!!!!!!!!!! lol but what i wanted was
> some help, i tried reading up on crossovers
> but i just don't get it. any help???

I'm glad you took it the way I intended.

Go to FRD consortium and download Passive Crossover Designer and SPL Trace. You can then use those programs to begin to learn how to design crossovers.

You picked some reasonable drivers for sure, but creating the FRD and ZMA files is time consuming and I'm just flat out lazy. I've been doing a number of projects lately and was just not up to the task at the time I saw your post.

Other things to consider are the effects of the baffle on driver responses, and without knowing your baffle configuration, whatever you design is not going to work optimally.

Designing the crossover to me is fairly simple. It's getting those plots into the proper form that is a pain in the arse. Check out FRD consortium. Those tools are really good.

[scottsehlin]

In order for us to be of much help, it would be nice to know a little more about the project. What type of cabinet will you be using? How will these speakers be used (room size, other equipment, type of music)?

Without that information, the general concerns I have relate the woofer. It is a buyout with no specifications readily available, which means it will have to be directly measured in order for a crossover to be designed. Also, it has a very low efficiency relative to your mid and tweeter (the MT section could work very well together once baffle step is taken into account). Your best option might be to make a passive crossover for the MT section and run the 12's as dual subs with an active crossover. If you want full-range 3-ways with a big, floor-standing cabinet that can be run off of a single amp, then I would suggest a pair (at least) of higher efficiency woofers.

I'm currently working on a pair of 3-ways with a sub driver as a woofer - and if that is really what you want, then I would suggest a different mid driver (maybe a Dayton RS150 or RS125 - or even a 4" Tangband bamboo cone) because you will never utilize the high efficiency and power handling you are paying for with the B&C driver in that configuration.

[daveh]

Provided Link: http://home.twcny.rr.com/cnydga/FRDtools.html


> I'm glad you took it the way I intended.

> Go to FRD consortium and download Passive
> Crossover Designer and SPL Trace. You can
> then use those programs to begin to learn
> how to design crossovers.

> You picked some reasonable drivers for sure,
> but creating the FRD and ZMA files is time
> consuming and I'm just flat out lazy. I've
> been doing a number of projects lately and
> was just not up to the task at the time I
> saw your post.

> Other things to consider are the effects of
> the baffle on driver responses, and without
> knowing your baffle configuration, whatever
> you design is not going to work optimally.

> Designing the crossover to me is fairly
> simple. It's getting those plots into the
> proper form that is a pain in the arse.
> Check out FRD consortium. Those tools are
> really good.

I found this to be helpful.

[Pete Schumacher ®]

> I found this to be helpful.

Roman's tutorial is excellent. I didn't know about it until after I brute forced the tools into my own brain. Looking back, I'm kind of glad I didn't see it because it forced me to really learn the tools in more depth. What was great was that after I figured out how to use them, I found that tutorial and realized that I was right on track.

[damkor]

You could cross the low at 300 to 400Hz. And the high between 2 and 5 kHz. I would do 350 and 3500. I'm not sure the tweeter is the best idea, because you don't need to go low with it. And I'm not sure the woofer is the best because it says it goes to 600Hz, but it doesn't show a response, anbd the sensitivity is low.

Tweeter 92dB
Midrange 95dB
Woofer 84dB including baffle step.

So, final system sens is about 84dB.

BTW, I DO Like the mid. With a single inductor, about 1mH, maybe a zobel to tweak, you could flatten that response and it rolls off naturally at 5kHz. Then use it with a 3/4" dome or a small ribbon. Then actively cross to a stereo woofer system in a separate box, maybe with two woofers per side, at 350Hz.