After working far too hard this summer and year, one thing I've concluded is that it's time to do some things just for the pure fun of it!
What's really puzzling how some recent inspirations seem like rediscovering things done ages ago... literally decades!
I really have been questioning myself about posting about some of this stuff, seems like it could be early dementia sets in- and in this day and age, we have more than enough of crazy going around for all of us!
But it's almost like re-living my parts of my mis-spent youth...
Here's one example... a new woofer system design, based on one I did in the early 90's for Thomas Waale, using Audax Pro woofers. Heres an updated version modeled in VituixCAD, and driver is on the way to build one... have refined the design mathematics, and this is just about the perfect driver for doing what I specifically want here...
tip of the hat to Kimmo for being able to model this in what seems to be an accurate fashion in VituixCAD.
As you can see from the info pane, -3dB point is 26 Hz. Not an HT sub, but fairly compact and killer for music. Bandpass enclosures get a bad rep for what people do with them in car audio, cranking up the gain, narrowing the bandwidth, and having tolerating a lot of ripple in the response and really crummy transient response in order to play loud and louder... but as I started to figure out in the 70's, there are some interesting things you can do with them with the right driver and approach. Oh, and up to 107 dB with just 100W. But it takes a rather different set of driver parameters...
Here's something else that's been coming together in a remarkably brief period of time- like last week? having some right bits lying around, and stumbling on something new to make something old...
Note the system sensitivity- a 2.5 way could improve it another 3 dB and of course increase the acoustical output capability. But it would also make it much larger. The Satori woofer as measured is in just 1 cu ft. Two cu ft is about ideal for a ported setup. But 4 cu ft for two, i.e., 100L, does start to get a bit largish for a condo, where I'll be the next 18 months.
I should redo the driver measurements- they were done at different times with different angle increments, and the only ones that lined up were 0 deg and 30 deg. Things look pretty righteous out to 45 of axis, but then that's what you should get with a constant directivity horn and the right driver. Try to guess the crossover frequency.
HD is very low- the HF sensitivity is about 107 dB, and rated power handling is 200W. And this combo goes for about the same bucks as a premium dome tweeter. I would have killed to have these in my PA system back in the early 70's. Titanium diaphragm Neo magnet compression drivers from B&C.
Impedance curve - could be driven by a broken transistor radio, I think...
The give away of the test setup last week for driver measurements, but note there is a new waveguide already in development at SMJ... Will post the crossover as soon as I have the parts and know it actually works like the simulation!
What's really puzzling how some recent inspirations seem like rediscovering things done ages ago... literally decades!
I really have been questioning myself about posting about some of this stuff, seems like it could be early dementia sets in- and in this day and age, we have more than enough of crazy going around for all of us!
But it's almost like re-living my parts of my mis-spent youth...
Here's one example... a new woofer system design, based on one I did in the early 90's for Thomas Waale, using Audax Pro woofers. Heres an updated version modeled in VituixCAD, and driver is on the way to build one... have refined the design mathematics, and this is just about the perfect driver for doing what I specifically want here...
tip of the hat to Kimmo for being able to model this in what seems to be an accurate fashion in VituixCAD.
As you can see from the info pane, -3dB point is 26 Hz. Not an HT sub, but fairly compact and killer for music. Bandpass enclosures get a bad rep for what people do with them in car audio, cranking up the gain, narrowing the bandwidth, and having tolerating a lot of ripple in the response and really crummy transient response in order to play loud and louder... but as I started to figure out in the 70's, there are some interesting things you can do with them with the right driver and approach. Oh, and up to 107 dB with just 100W. But it takes a rather different set of driver parameters...
Here's something else that's been coming together in a remarkably brief period of time- like last week? having some right bits lying around, and stumbling on something new to make something old...
Note the system sensitivity- a 2.5 way could improve it another 3 dB and of course increase the acoustical output capability. But it would also make it much larger. The Satori woofer as measured is in just 1 cu ft. Two cu ft is about ideal for a ported setup. But 4 cu ft for two, i.e., 100L, does start to get a bit largish for a condo, where I'll be the next 18 months.
I should redo the driver measurements- they were done at different times with different angle increments, and the only ones that lined up were 0 deg and 30 deg. Things look pretty righteous out to 45 of axis, but then that's what you should get with a constant directivity horn and the right driver. Try to guess the crossover frequency.
HD is very low- the HF sensitivity is about 107 dB, and rated power handling is 200W. And this combo goes for about the same bucks as a premium dome tweeter. I would have killed to have these in my PA system back in the early 70's. Titanium diaphragm Neo magnet compression drivers from B&C.
Impedance curve - could be driven by a broken transistor radio, I think...
The give away of the test setup last week for driver measurements, but note there is a new waveguide already in development at SMJ... Will post the crossover as soon as I have the parts and know it actually works like the simulation!
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