Mid Bass Horn Design 80-800 Hz

[bfish]

I guess I'd have to side with the smooth school. To me, any discontinuity creates a disturbance, whether it be an intake manifold, a section of ductwork, or a horn.

As far as surface treatment goes, what you'll need will depend on what you need to fix. I suggested the mouth treatment only because it appears to be widely applicable. (Again, consider the Urei duplex horn as a commercial example). I expect you'll need it. Other than that, it's less a matter of prediction, rather, you'll just need to see what's needed by testing and tinkering.

Remember that all losses, whether mechanically in the box/horn, cancellations, or lost to absorption, come from the available gain. Solid surfaces that support efficient wave propogation are the ideal, damp only where you must to fix a problem.

It'll all become apparent when you start testing things. You've gone about as far as you can on (practical) simulations. Now you're behind enemy lines in uncharted territory, and the manual's no help. Time to shine.

[Steve Mac]

Not too much to report, but just before the thermometer dipped last night I managed to fill 95% of both walls on the other horn. In addition the other trim mounting pieces were attached to the first horn and now the hardest part is officially over for the first horn which is curing. You can get a good look in the second pic at what the side wall looks like with the mounting boards. I slipped a few screws to hold the walls in place:

pic 1
pic 2

[Steve Mac]

Gee, it's been a while hasn't it.
Well, progress was slow what with the weather and the curing of glue, but managed to trim the excess from the sidewalls, glue an oak end cap and slip a few screws in for display. Except for some trim on the front of the wedges, the actual look can be appreciated. I stuck my head through the speaker holes and was talking to my wife...I now have the upper hand and can hear what a good horn can really do! Heck maybe I found a better use for these cabs than for a lousy stereo...the new Speakover Wife 200 Series.
horn pic 1
horn pic 2
horn pic 3

[donaldpatten]

Hi Steve
You still have a wife ? She must be related to Job.
Have you tried mounting the woofers and giving your new cabs a listen? Keep us up to date.
Don

[Steve Mac]

Originally posted by donaldpatten:
Hi Steve
You still have a wife ? She must be related to Job.
Have you tried mounting the woofers and giving your new cabs a listen? Keep us up to date.
Don

<font size="2" face="Verdana, Helvetica, sans-serif">What's funny is that as much as she was against all of this, my big carpentry days were before I met her. So, she is confused right now...not understanding how I'm able to pull this off. This may work against me when she realizes I can actually make a bird house or a magazine rack.

I may be just a few weeks away from the maiden voyage...

[Steve Mac]

I have purchased two new candidates for this system. To compare to the altec 511s with 808s I won these on c_rapbay:
Edgarhorn tractrix horn
I got lucky because they don't come up too often and I was able to find a buddy who wanted the rest of the edgarHorn system 100.

the great thumbnail option doesn't work...

<font color="#FFFFFF"><font size="1">[ March 03, 2008 11:04 PM: Message edited by: Steve Mac ]</font></font>

<font color="#FFFFFF" size="1">[ March 05, 2008 03:50 PM: Message edited by: Steve Mac ]</font>

[Steve Mac]

What do you guys think will sound better?
This?
Layout with 511
Or this?
Layout with Edgar Horn
I've been thinking again about the right power amp and I know you guys said to get an amp twice the rated speaker power(300wpc) but I came across this offering from Odyssey Audio called the Stratos and it seems pretty hi fi but pretty affordable(150wpc):
Odyssey Audio products: the Stratos
Opinions? They're built right here in Indy!

[Steve Mac]

Work continues on the rear chamber...
Tee nuts installed

Neoprene seal on rear chamber

Rear chamber back

Tomorrow I'll measure the backs for mounting screws...get some insulation for the inside...gotta drill a small hole to fish a speaker wire and...then...bam!...it can be fired up...this weekend. What a long project!

[donaldpatten]

Steve
Do not forget to cover the "T"nuts so they cannot fall in.
The Edgar horn , definitely the Edgar. It looks right with your work of art ,the bass bin , lovingly cradling it, in it's wings. And
of course it will sound better.
Don

[Steve Mac]

Originally posted by donaldpatten:
Steve
Do not forget to cover the "T"nuts so they cannot fall in.
The Edgar horn , definitely the Edgar. It looks right with your work of art ,the bass bin , lovingly cradling it, in it's wings. And
of course it will sound better.
Don

<font size="2" face="Verdana, Helvetica, sans-serif">Thanks Don.
I have the edgarhorns and I'm listening to them now and they work...that's good...I just don't have an opinion until things get to the set up and measure point. Thing is...the sentimentality of completely altec done good is still something I need to do. We'll see.

Anyway, IF I had the right size screws, I could have listened to the big guys tonight. Son of a gun. But I did put one speaker in just to fantasize. Yeah I know, need to get a life:


A 515 in the hole...