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Old 1st February 2013, 11:09 AM   #1171
xrk971 is online now xrk971  United States
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Making$,
I can't see the picture you posted.
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Old 1st February 2013, 11:23 AM   #1172
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Hopefully the image appears...

Below is a rough sketch.

Is there an OB 3" driver that would work well in this?

Maybe bass down to 100-200hz?

Click the image to open in full size.
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Old 1st February 2013, 11:37 AM   #1173
xrk971 is online now xrk971  United States
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Making$,

There is a deal on a 3 in full range driver with high Qts at Madisound for $2. Aurasound NS3 16 ohm neodymium driver I think. It would be perfect for this. I was going to get 50 then they are only $1. Cal has tried them in the Cornu and says they are pretty good. You may want to wire in parallel to get 8 ohms.
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Old 1st February 2013, 11:38 AM   #1174
KLBIrd is offline KLBIrd  United States
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We are going to have to coin a new description of DIY foam board speaker builders. FOAMERS!

I just built my first one using the Dayton ND 105 four inch in a quarter wave design. It even impressed my wife with its rich bass.
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Old 1st February 2013, 11:41 AM   #1175
xrk971 is online now xrk971  United States
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KLBird,
Congrats on the first build! please post pics!
Foamers Rule! Foaming at the mouth rabid that is

Last edited by xrk971; 1st February 2013 at 12:07 PM.
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Old 1st February 2013, 12:09 PM   #1176
xrk971 is online now xrk971  United States
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Making$,
Here is the link to the NS3 driver I was talking about. The FR curve actually looks pretty good.

The Madisound Speaker Store
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Old 1st February 2013, 12:29 PM   #1177
IG81 is offline IG81  Canada
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Quote:
Originally Posted by xrk971 View Post
IG,
6 dB is not too bad. Too bad it impacts the high bandwidth. With properly designed curved horn, can that impact be reduced? Something like tractrix shape is used on HF correct?
FF85WK does not have the motor strength or rising response to be behind such an aggressive horn. 90 would be better, maybe parabolic could be interesting, though much hard to to make. Tractrix does get more HF out from a compression driver, don't know how it would do for a cone driver. I should look up Bruce Edgar's old article that was for a 5" JLB midrange IIRC.

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Old 1st February 2013, 02:47 PM   #1178
xrk971 is online now xrk971  United States
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I am gonna cut some tractrix panel tonight and glue them up. Should be fun. I don't have a clue how big to make it for a 3.5 in driver so I will just try something. Do you have a thread to point me to? I bet GM would know.
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Old 1st February 2013, 03:13 PM   #1179
ravener is offline ravener  Singapore
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Tweaked the design a little, made the compression chamber rounder and the throat tighter.

fh = (342 x 0.00194m^2) / (2 * 3.142 * 0.00050m^3) = 210Hz

Seems rather reasonable...

Shall be starting work using this.

edit: upon looking at tractrix horns... mine seemed like an asymmetric curved tractrix...
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Old 1st February 2013, 03:26 PM   #1180
IG81 is offline IG81  Canada
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Quote:
Originally Posted by xrk971 View Post
I am gonna cut some tractrix panel tonight and glue them up. Should be fun. I don't have a clue how big to make it for a 3.5 in driver so I will just try something. Do you have a thread to point me to? I bet GM would know.
You might glean some useful bits from the old Bruce Edgar article:




I ought to go through it again myself.

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