need advice for next project

[lloydb]

I'd like to build a set of speakers and use a folded horn for the bass. I was thinking of using these drivers for the horn. I've built a set of front loaded horns but I was just going to wing the fold design on this one.

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-510

Then I was going to use these for midranges

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-404

tweeters.. http://www.parts-express.com/pe/showdetl.cfm?Partnumber=270-135

For those who know way more than me.... if I'm making a mistake with this, please help me out. I really like the punch of a folded horn. This is going to be for a large room (home theater).

[djk]

That tweeter is quite bad.

Are you trying to horn load the mid? It's not suited for that, and is not efficient enough otherwise.

The woofer is pretty good.

[lloydb]

No, I wasn't planning to horn load the mid... advice on a mid and tweeter?

[lloydb]

What would make a mid suitable for horn loading if I wanted to do that?

[lloydb]

Ok, I think I'm beginning to understand. The midrange needs a higher "bl" for horn loading. How about this one?

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-507

[djk]

This would be even better:

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=294-652

[lloydb]

Ok cool, much appreciated.. What would you use for a tweeter?

[djk]

| 38 Hz Tapped Horn

Def_Const |Horn Dimensions

{
a1 = 250e-4; |Area at throat (cm^2)
a2 = 350e-4; |Area at rear of driver (cm^2)
a3 = 2300e-4; |Area at front of driver (cm^2)
a4 = 2500e-4; |Area at mouth (cm^2)
l1 = 14e-2; |Distance from throat to rear of driver (cm)
l2 = 250e-2; |Line distance from rear of driver to front of driver (cm)
l3 = 18e-2; |Distance from front of driver to mouth (cm)
}

Def_Driver 'Dr1'

| Delta Pro 12A

Sd=532.4cm2
fs=51Hz
Qes=0.37
Qms=7.56
Vas=81.7L
Re=5.71ohm
Le=3.84mH

system 'S1'

Driver Def='Dr1' Node=1=0=3=4
Waveguide 'W1' Node=2=3 STh={a1} SMo={a2} Len={l1} Conical
Waveguide 'W2' Node=3=4 STh={a2} SMo={a3} Len={l2} Conical
Horn 'H1' Node=4 STh={a3} SMo={a4} Len={l3} Conical

(I'll explain this tomorrow, it's a tapped horn design for the Delta Pro 12A that could be crossed over around 280hz, and is -3dB at 38hz, and quite small)

For a tweeter I would buy a good 1" driver. Selenium is very reasonable. I am going to try and find a less expensive mid driver too.

[djk]

[djk]

A possible solution for mids and HF:

http://www.cowanaudio.com/pipeline.html

A pair of Eminence Alpha 6 would be an inexpensive substitute for the B&C drivers.

[Binkstir]

djk,

lol, I think this may be beyond my skill level. I like it though. I take it that the oblong slots are for the midrange drivers? One driver for each pair of slots?

lloydb

[djk]

"I take it that the oblong slots are for the midrange drivers?"

Yes

" One driver for each pair of slots?"

Yes

Do you have a table saw?

It's not as hard as it looks.

The angles in the horizontal plane are only 45° and 22.5°

I built four of these on Sunday afternoon (with one helper with a pickup truck).

[lloydb]

Yeah, I have a table saw. I just don't understand all the stuff I can't see in that photo. (im lost without plans)

I built four of these on Sunday afternoon (with one helper with a pickup truck).

Man, you are the speaker project king!

[djk]

Maybe a ready made mid and HF horn flare is what you seek?

http://www.jblproservice.com/pdf/Venue%20Series/VS3115-WH.pdf

[lloydb]

Well I can build the flare and such if I had plans. I just don't wanna do it wrong.

You know what I've been thinking? I found the la scala plans. I could just build a set of those. That one guy has the woofer for sale.. all I'd have to do is come up with a crossover and the horns right?

[djk]

A LS is fairly straightforward.

K43E (black) vs K33E (gray)

1)Vented LS. 2)Vented LS (grey) vs stock LS (black), K43E.