Hi Guys.
So, a follow member (Bumbledad) gifted me a new pair of Heil AMT drivers. I decided to build a pair of speakers with parts I have in the shop.
I have a pair of JBL 6x6 horns and a pair of Dayton Audio DT250P-8 Compression Driver.
I also have a pair of DynaLab V22-DR-0003 8" Paper Cone Woofer 4 Ohm that have an f3 of 25hz in a 3 cu ft box.
The CD is solid down to 600hz out to 10khz.
so I want to cross the woofer at 600hz to the CD then cross the CD at 5khz or so to the Heils. I have an active three-way crossover and a handful of amps.
Below is a link to the woofers and a picture of what I’m thinking for the cabs but with the horn above the woofer and the Heils on top like the picture.
DynaLab V22-DR-0003 8" Paper Cone Woofer 4 Ohm
So, a follow member (Bumbledad) gifted me a new pair of Heil AMT drivers. I decided to build a pair of speakers with parts I have in the shop.
I have a pair of JBL 6x6 horns and a pair of Dayton Audio DT250P-8 Compression Driver.
I also have a pair of DynaLab V22-DR-0003 8" Paper Cone Woofer 4 Ohm that have an f3 of 25hz in a 3 cu ft box.
The CD is solid down to 600hz out to 10khz.
so I want to cross the woofer at 600hz to the CD then cross the CD at 5khz or so to the Heils. I have an active three-way crossover and a handful of amps.
Below is a link to the woofers and a picture of what I’m thinking for the cabs but with the horn above the woofer and the Heils on top like the picture.
DynaLab V22-DR-0003 8" Paper Cone Woofer 4 Ohm
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That’s one area I need to understand better. All these years I’ve done it by ear but it’s time to learn how to simulate the crossover and built to that.
Simulations are a good starting point, but you will eventually tweak things by ear. Nothing is as it seems, everything needs to be tweaked or as some call it optimized.
So, is there a reason to use a folded Voigt pipe it transmission line for the woofer cabinet??? Here are the speaker specs.
Product Details | |
|---|---|
| Brand | Factory Buyouts |
| Model | V-22DR-0003 |
| Part Number | 299-4004 |
| UPC | 844632014871 |
| Unit of Measure | Each |
| Weight | 3.45 |
Product Specifications | |
|---|---|
| Nominal Diameter | 8" |
| Power Handling (RMS) | 80 Watts |
| Impedance | 4Ω |
| Frequency Response | 40 to 4,500Hz |
| Sensitivity | 86.98dB 2.83V/1m |
| Voice Coil Diameter | 1.5" |
Materials of Construction | |
|---|---|
| Cone Material | Paper |
| Surround Material | Rubber |
| Voice Coil Wire Material | Copper |
| Voice Coil Former | Aluminum |
| Basket / Frame Material | Steel |
| Magnet Material | Ferrite |
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Thats a tricky driver to make work properly blending with a cone driver. I've tried in the past and failed miserably at getting acceptable results. I hope you're more successful than I was.
That one number makes for a large aperiodic enclosure (or an OB).
Voigt or TL is likely a fantasy (or really, really big).
dave
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So use these Scanspeak 290001 Aperiodic Vent instead of normal open vents.
For $31.00 each, could I used a tube vent and stuff it?
For $31.00 each, could I used a tube vent and stuff it?
I also came across this post from 2007 from philthien on Tech Talk.
Fried made several versions of Beta speakers, and one of them used two smaller holes (maybe 1/2") in the baffle as aperiodic vents. I imagine the backs of the holes was covered with some material. But I guess you don't have to worry about port noise so you don't need to go overboard on size. I have heard Beta speakers and was amazed by the bass coming from such a small package.
I'm including a pic.
Fried made several versions of Beta speakers, and one of them used two smaller holes (maybe 1/2") in the baffle as aperiodic vents. I imagine the backs of the holes was covered with some material. But I guess you don't have to worry about port noise so you don't need to go overboard on size. I have heard Beta speakers and was amazed by the bass coming from such a small package.
I'm including a pic.
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This will be in interesting experiment.
From the P.E. Site they recommend—-
Sealed Volume of 0.682ft³
Sealed F3 of 64.72Hz
And
Vented Volume of 2.98ft³
Vented F3 of 25.51Hz
So where would an Aperiodic Vented cabinet end up for volume and F3???
And, how do I determine the volume?
From the P.E. Site they recommend—-
Sealed Volume of 0.682ft³
Sealed F3 of 64.72Hz
And
Vented Volume of 2.98ft³
Vented F3 of 25.51Hz
So where would an Aperiodic Vented cabinet end up for volume and F3???
And, how do I determine the volume?
Fried made a bunck of aperiodic loudspeakers. The R & The Q were standout. Essentially a box with a substantial slot vent filled with foam rubber (i think they could have used better, looked like it could have been a slice from a foam mattress).
Never saw a Q with such nice veneer, the ones we had were cosmetically similar to the bigger R.
dave
Never saw a Q with such nice veneer, the ones we had were cosmetically similar to the bigger R.
dave
Gotta go turn on my modeling computer.
The Qt is high. Hgher than the max flat Q = 0.707. Any box will push that higher.
An aperidoci box (a controlled leakage sealed box) will lower the Q somewhat.
So the reciepe is, a box as large as you can live with and make it aperiodic.
Or sealed, with EQ (Linkwitz transformish thing), but requires extra power & excursion.
The Qt is high. Hgher than the max flat Q = 0.707. Any box will push that higher.
An aperidoci box (a controlled leakage sealed box) will lower the Q somewhat.
So the reciepe is, a box as large as you can live with and make it aperiodic.
Or sealed, with EQ (Linkwitz transformish thing), but requires extra power & excursion.
First came H, R & Q. All other models followed after (and after my time in retail).
https://www.t-linespeakers.org/classics/friedH/fried_H.html
dave
I like this and will run with it.
“So the reciepe is, a box as large as you can live with and make it aperiodic”
“So the reciepe is, a box as large as you can live with and make it aperiodic”
When you get to the last bit here are some good working solutions for dialin gin the “vents", discussed elsewhere already.
dave
dave