Take the volume of the speaker and add it to the last segment volume of the enclosure. Use the revised model for building. Revert back to the original model for performance.
I wonder if that's accurate enough? Consider for example the extreme case of a driver of low volume whose shape is wide enough to restrict S4 by over 90%...
refer to post #31
http://www.diyaudio.com/forums/subw...oaded-compact-th-flat-40hz-4.html#post3910199
"so, the volume of the area where the driver is, is 39 liters. the driver occupies 5.1 liters of this space, a 12 percent reduction in volume. dunno what this translates too, again."
that being said, at its widest point, the driver *can shade* as much at 40% of the CSA, even while only occupying 12 percent of the volume. adjusting this (in hornresp) would likely not be accurate because you are changing the flare to much. akabak is requisite.
http://www.diyaudio.com/forums/subw...oaded-compact-th-flat-40hz-4.html#post3910199
"so, the volume of the area where the driver is, is 39 liters. the driver occupies 5.1 liters of this space, a 12 percent reduction in volume. dunno what this translates too, again."
that being said, at its widest point, the driver *can shade* as much at 40% of the CSA, even while only occupying 12 percent of the volume. adjusting this (in hornresp) would likely not be accurate because you are changing the flare to much. akabak is requisite.
Can I find a project that looks like THAM 12 or 15 but have a extension to 43 Hz. not a huge one, just little bit.
Who know how to make a bigger THAM ?? I want just 5-7 Hz lower than 50Hz...
I want a tested project
Thank you!
This is a nice one.
Martinsson's Blog -
Can I find a project that looks like THAM 12 or 15 but have a extension to 43 Hz. not a huge one, just little bit.
Who know how to make a bigger THAM ?? I want just 5-7 Hz lower than 50Hz...
I want a tested project!
Thank you!
JBell's SS15 was designed to get in that ballpark IIRC:Single Sheet Challenge thread
David,
YR is not C ;^).
The SS15 starts rolling off below 60Hz, is about -3dB at 50Hz, -10 dB at 40 Hz.
Art
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I am not a skilled carpenter and dont have fancy power tools so building complicated cabinets is not for me and the cost of paying a joiner to build a tapped horn is mega $$$
I decided to keep it simple with a small (44 litres) sealed box and invest my money in an amazing driver that is flat to 30Hz in room with massive headroom and the lowest power compression ( thermal distortion) of any 15-inch driver I have found.
Highly recommended!!
I decided to keep it simple with a small (44 litres) sealed box and invest my money in an amazing driver that is flat to 30Hz in room with massive headroom and the lowest power compression ( thermal distortion) of any 15-inch driver I have found.
Highly recommended!!
Alex,
I'm afraid the Faital Pro 15HP1030-loaded Oth40C would wipe the floor with a sealed box in terms of output.
Not only does the Faital unit have considerably more Xmax than the PD driver you've simulated, but the tapped horn aids the driver much more than a sealed box. The tapped horn here was around 98dB@1w down to 40Hz, and with the driver used, I'd expect a couple of kilowatts would be fine for short-term power. It'd manage around 128dB before thermal problems come in.
Having actually used sealed boxes for PA systems, I'd strongly recommend against it unless you have a very particular reason to do so.
Chris
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