Please advise on a project

[amo]

I finally have some money for speakers, and I am approaching the DIY concept for the following reasons:
First and foremost, there are decent pre-made cabinets available
Second, I am assuming that for about the price of a decent mid-fi speaker I can put together something better.
I am hoping to get some advice as to which way to go...
I really like the Eaton 7 inch mid woofer. It goes for about $130 at Madisound, goes down to 40 Hz, will fit
into most pre-made cabinets, has very low distortion, has a durable cone, and I have seen it used in some high end
designs. And from what I can tell, it can be crossed over fairly high if needed. My questions are: What do you think about this driver, what is a good tweeter of similar quality to mate it with in a 2-way sealed design, and what cross over design should be used, specifically what xo point and slopes should be used? Your help is greately appreciated!!!

[PeteMcK]

from the LSDG
"this driver has a strong primary resonance which falls only slightly above its maximum recommended crossover frequency (2.5 kHz). A notch filter is advisable in any case, but a crossover frequency of 1.5 kHz or less would make for an easier design job with more manageable phasing"

so perhaps it needs to be used with a tweeter with a low resonant freq, e.g. the appropriate Seas models?

[Jay_WJ]

The Eton has only a 3 mm Xmax. Not a good driver for 2 way application. Peerless HDS Exclusive has lower distortion, greater excursion, and is less expensive.

And don't use textbook formulas to design a crossover. Consider a simulation approach. Depending on how well you use simulation tools described in the following tutorials, you can get a very good result:

1. http://www.rjbaudio.com/Audiofiles/FRDtools.html
2. http://www.rjbaudio.com/Audiofiles/SWtutorial.html
3. http://www.rjbaudio.com/Audiofiles/d...alculator.html


I basically agree with what Roman says in his webpage:

"... So this example reveals several things about the value of using FRD tools to design a crossover. It shows that the tools can be very accurate with the most common required adjustment being the tweeter attenuation. It also shows that even if you have measurement capabilities the simulated responses tend to be more accurate in the sub 500 Hz region where taking accurate measurements can be very difficult and this can be very critical when designing a three way speaker. One other benefit of using the FRD tools is that it allows you to experiment with different driver combinations and determine which ones have the highest probability of succeeding. As you can tell I'm a big fan of the FRD Consortium tools and they sure make my life a lot easier when it comes to designing speakers."

[sreten]

Originally posted by amo

.... mate it with in a 2-way sealed design ....

Hi,

What reasons do you have for going sealed ? HT amplifier + sub ?

/sreten.