help for a newbie :\

[Rufes1]

Hi,

Sorry to trouble you these beginner questions. I wish to make a pair of loudspeakers containing 2 mid ranges and a tweeter. Each must have a total of a 4ohm load.

The construction of the box is not much of a drama apart from the design, I have all the tools and am good with my hands. I have experience with car audio so I have some general knowledge about required speaker displacement.

I was thinking of a design with a mid at the top, tweeter in the middle, followed by, you guessed it, mid at the bottum.

I was thinking along the lines of Peerless 100 DT 26/72 for the tweeters

And for the mid, Peerless 6.5inch 176 WR 26 / 90

As you can see this is a budget design, however I want to get the best value.

As for the wiring, I really dont have much of an idea apart from wiring them in this fashion:

hxxp://colomar.com/Shavano/3sp-spk1.gif


With the tweeter being the 8ohm. As for crossovers, I dont know what I am looking for.

Speaker box displacement - does it need to be a huge floorstander? Or can it just be a semi - bookshelf? Does the enclosure need to be split or be lined with decron foam?

Thanks for your understanding and help


Matt.

[sek]

Hi Matt,

Each must have a total of a 4ohm load.

To get startet, may I ask you why they must have four Ohms?

With the tweeter being the 8ohm. As for crossovers, I dont know what I am looking for.

I don't know your particular drivers (http://www.d-s-t.com.au/Data/Peerless/831975.pdf and http://www.d-s-t.com.au/Data/Peerless/811827.pdf), but the whole crossover depends on those.
I guess someone else here can give you hints (and links) on how to develop one

But the fact that you don't have a crossover idea explains your next question

As for the wiring, I really dont have much of an idea apart from wiring them in this fashion: hxxp://colomar.com/Shavano/3sp-spk1.gif

The schematic in that http site shows a solution for combining different speakers which serve the same purpose. You could combine two 4Ohm woofers with an 8 Ohm woofer in this way (e.g. to connect the three to an amplifier that was made for 4Ohm speakers).

But it doesn't have anything to do with your project. So please don't bother thinking about it!

To cut a long story short: the crossover schematic will solve that problem for you. I suggest you chose a configuration where the two Woofers are connected to their crossover network in parrallel, while the tweeter is connected to its crossover network directly. The two networks are then wired together and (via terminal and cabling) connected to the amplifier.

Speaker box displacement - does it need to be a huge floorstander? Or can it just be a semi - bookshelf?

I don't think your box needs to be displaced (from what) in a speacial way, but I'd suggest you let your ears and eyes decide. Anyways, the box stand shouldn't be part of this project, as you said you want to build a compact W-T-W enclosure.

Does the enclosure need to be split

Split? You mean internally? That's a good question some people like it like this, others like it like that

I'd suggest you to put a wall inside the enclosure and form two independent volumes for the two woofers (as the tweeter doesn't need an own volume). Hint: putting such a wall right behind the (covered) tweeter opening dampens the whole enclosure in general and the tweeter in particular

or be lined with decron foam?

Hmm, what's decron foam? I assume you talk about damping the inside of the box?

Using 'stuffing' material inside a box is very useful for closed boxes, but should be used with care for vented (reflex) boxes as it could (acoustically) block the port and mistune the box.

I'm sorry I can't serve you with a compiled link list answering your questions here, but nothing I could supply is in English