How about this one?
Dayton Audio ST385-8 15" Series II woofer
Qts = 0.32
FS = 19 Hz
It's not too hard to find a Qts down to 0.2, but that's usually with an Fs over 30 Hz.
Dayton Audio ST385-8 15" Series II woofer
Qts = 0.32
FS = 19 Hz
It's not too hard to find a Qts down to 0.2, but that's usually with an Fs over 30 Hz.
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Hi T.O. - BudP got me started on EnABL back a couple of years ago when I was butchering up my Walsh 5 remakes. We started discussing his EnABL process and it branched out to his threads about "how to do it" along with all of the various discussions about snake oil and a pinch or two of powdered toad - plus how to apply brush strokes. Then to add insult to injury he came out with those little hangy downy thingies that play with ground loops!!!
~~~~~~~~~~~~~~~~~~~snip~~~~~~~~~~~~~~~~~
BTW - a big Thank You for your new letters!!! Man - that is one heck of a club ya kids have going!!!!
We have a little Nashville Audio Society meet this coming weekend - I'll keep you posted.
Well, it's over. Last night we decided that I'd go first, then Bud, as my topic is really preparatory to his. He ran a couple of videos from a laboratory in Britain that dealt with wave analyses and then actually started playing some music. He began with a pair of untreated (Fostex 126 drivers) Fonkens, let it play for a bit before switching to the treated Fonkens, which had Fostex drivers from the same production run.
As one new member (an Electrical Engineer) said when Bud switched over to the treated pair:
"Holy Mother of God! What an improvement!"
After playing music and switching back and forth for awhile, there were a lot of questions and much interest in the enAble process, but also in the Planet 10 Fonkens, which were visually quite stunning.
Fun evening, I wish I could go a bit more into detail, but I've received an invitation from Doc Bottlehead for a private Audio Play-Day later today. He wants to mess around with my focused arrays, and we'll be trying out his electronics on it. Can you imagine serial SET amps to drive them?
(Besides, he said he's buying the beer
)Best Regards,
TerryO
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You might want to examine the Modafferi patent that references this one
Phase shift low frequency loudspeaker system
Rgds
James
Phase shift low frequency loudspeaker system
Rgds
James
Attachments
Well, in Nestorovic's own-brand speaker systems, they were typically driven by Nestorovic's own-brand tube amps. The Nestorovic amps were pretty hefty though, I think they were around 150W output.
I downloaded that one! I don't have time to give it a careful reading right now so I will save it for tonight.
One issue I did notice on a drawing was “acoustic mobility analogy of air inside box 10”. I wonder how atmospheric pressure at various altitudes might affect the operation of the unit???? Maybe it needs a pressure gauge on it somewhere along with an air pump...............
Especially considering that Nestorovic and Modafferi both had McIntosh connections.
Hey LafeEric, for some reason when I click on the link it comes up with a Goldwood that has an Fs = 33Hz. Wierd.
Peace,
Dave
Looks like a simple solution there Dave - I screwed up!
I was sure I double checked it - but apparently not.
Thanks for the fix c2cthomas.
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Hi Chris,
After drinking my usual amount, I drove home sober.
Chris, that was my mistake. The Fostex convention of 6's and 7's always get me screwed up.
The video presentation certainly cleared up a great deal of the mystery surrounding the ebABLE treatment and showed that there is actually a fair amount of objective evidence that backs up what Bud has maintained for years. I think what impressed me the most was that Bud's subjective impressions, intuitive understanding and reasoning ended up so (very, very) close to what has now been shown to be an actual physical phenomenon.
(Let's get back to the main topic, I apologize for the digression.)
Best Regards,
Terry
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Bud has a ebABLE treatment now!!!! WOW - and you say you drove home sober - hmmmmmmm........
Video presentation???? Man - I would like to see that! Can you "YouTube" it???
Now back to our regular sponsored topic.......
A Nestorovic setup script for AKABAK with a 8' USHER W and 12' SCANSPEAK SW in a 60 L closed box:
System 'Sealed Sub'
Def_Driver '30w-4558t00'| SCANSPEAK
SD=466cm2
fs=17Hz
Cms=0.65e-3m/N
Rms=2.88Ns/m
Bl=10.5Tm
Re=2.6ohm
Le=1mH
ExpoLe=0.618
Def_Driver '8955'|USHER
SD=232cm2
fs=26Hz
Cms=1.07e-3m/N
Rms=2.6Ns/m
Bl=9.27Tm
Re=5.5ohm
Le=1mH
ExpoLe=0.618
Def_Const |With this all parameters must be converted based on Meters
{
AA = 60.00e-3; |Rear chamber volume (litres)
BB = 20.00e-2; |Rear chamber average length (cm)
SS1 = 232e-4; |Diaphragm area (sq cm)
SS2 = 4660e-4; |Diaphragm area (sq cm)
}
Driver 'D1' Def='8955'
Node=100=0=2=3
Radiator 'Rad1'
Node=2
Sd={SS1}
Coil Node=1=100 L=.434mH Rs=0.55ohm
Resistor Node=100=10 R=1.05000ohm
Capacitor Node=10=11 C=300uF
Resistor Node=10=11 R=50ohm
Driver 'D2' Def='30w-4558t00'
Node=11=0=4=3
Radiator 'Rad2'
Node=4
Sd={SS2}
Enclosure 'E1'
Node=3
Vb={AA}
Lb={BB}
System 'Sealed Sub'
Def_Driver '30w-4558t00'| SCANSPEAK
SD=466cm2
fs=17Hz
Cms=0.65e-3m/N
Rms=2.88Ns/m
Bl=10.5Tm
Re=2.6ohm
Le=1mH
ExpoLe=0.618
Def_Driver '8955'|USHER
SD=232cm2
fs=26Hz
Cms=1.07e-3m/N
Rms=2.6Ns/m
Bl=9.27Tm
Re=5.5ohm
Le=1mH
ExpoLe=0.618
Def_Const |With this all parameters must be converted based on Meters
{
AA = 60.00e-3; |Rear chamber volume (litres)
BB = 20.00e-2; |Rear chamber average length (cm)
SS1 = 232e-4; |Diaphragm area (sq cm)
SS2 = 4660e-4; |Diaphragm area (sq cm)
}
Driver 'D1' Def='8955'
Node=100=0=2=3
Radiator 'Rad1'
Node=2
Sd={SS1}
Coil Node=1=100 L=.434mH Rs=0.55ohm
Resistor Node=100=10 R=1.05000ohm
Capacitor Node=10=11 C=300uF
Resistor Node=10=11 R=50ohm
Driver 'D2' Def='30w-4558t00'
Node=11=0=4=3
Radiator 'Rad2'
Node=4
Sd={SS2}
Enclosure 'E1'
Node=3
Vb={AA}
Lb={BB}
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