No, I've probably confused the issue & sorry about that, I'm not the OP but interested in learning about the same kind of solutions for home use. I went to the church organist to find out what they were using on their organ. The above is info of the kind I'm interested in, thanks!
Dear friends,
I found 12" driver from Boss audio , which turns out to be quite cheap. and the reviews show that the performance is quite good. is it possible for me to achieve the 10Hz -16Hz infrasonic frequency with a ported enclosure design'
P126DVC | Boss Audio Systems
regards,
Alex
I found 12" driver from Boss audio , which turns out to be quite cheap. and the reviews show that the performance is quite good. is it possible for me to achieve the 10Hz -16Hz infrasonic frequency with a ported enclosure design'
P126DVC | Boss Audio Systems
regards,
Alex
INFINITY
Dear all,
I have ordered an INFINITY Reference 1262w 12" sub. the link below gives the details and specs.
http://infinitysystems.com/product-detail-11657/ref1262w.html
will this sub meet my requirements?
if so what enclosure design and dimensions (including the port tuning; if ported design is preferred) will be ideal for this sub to effectively reproduce infrasonic sound.
regards,
Alex
Dear all,
I have ordered an INFINITY Reference 1262w 12" sub. the link below gives the details and specs.
http://infinitysystems.com/product-detail-11657/ref1262w.html
will this sub meet my requirements?
if so what enclosure design and dimensions (including the port tuning; if ported design is preferred) will be ideal for this sub to effectively reproduce infrasonic sound.
regards,
Alex
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Good Alex,
You will get infrasound.
Now to the speaker you will need, I will model a BR alignment.
A special built enclosure is possible in a TL/QW/TH or BR form. A sealed unit would be good only in another application regarding your requirements for LF extension.
INFINITY Reference 1262W DVC
VB = 98.4 L, FB = 17.6 Hz
You will need a BR enclosure with net ~100L.
You will need to add extra space for the volume of the port, if you place it inside the cabinet. If you place the port outside the cabinet you don't need to add extra volume to the total (net) internal volume of the speaker.
Now this is going to be very important and decisive for a good final result.
Let's say that you have 100L (net) plus 15L (port) plus 2L (driver), you have 117L total inside volume needed.
The size/volume of the port it's in relation to the materials used, if you use a pvc pipe vs. ply/wood (for a round or square port).
Also the power W used is going to be important for the max. SPL and port noise.
Let's say you are using max. power admissible. So, for a 12.5 cm port (internal diameter) you will need a 111 cm length (yes, 1 meter and 11 cm) for the tuning frequency to be calibrated. You can adjust and test this later, with your final design.
A port built with ply/wood will have a much higher volume that the one I used previously for a pvc pipe. Let's say 30 cm x 5 cm (internal) square port made of 1" ply (it's 35 cm x 10 cm external) will have a volume close to 38L, this only for the port (vs. the 15L of a pipe with ~3mm thickness), putting your final internal (net) enclosure volume in ~140L (100+38+2).
Measure carefully the thickness of the materials used (PVC, ply or MDF) and final volumes and dimensions of parts, internal and external, for an appropriate and calibrated result that matches the one expected by the simulations. Have fun and a lot of infrasound music. 🙂
Speaker Box Volume Calculator / Designer
You will get infrasound.
Now to the speaker you will need, I will model a BR alignment.
A special built enclosure is possible in a TL/QW/TH or BR form. A sealed unit would be good only in another application regarding your requirements for LF extension.
INFINITY Reference 1262W DVC
VB = 98.4 L, FB = 17.6 Hz
You will need a BR enclosure with net ~100L.
You will need to add extra space for the volume of the port, if you place it inside the cabinet. If you place the port outside the cabinet you don't need to add extra volume to the total (net) internal volume of the speaker.
Now this is going to be very important and decisive for a good final result.
Let's say that you have 100L (net) plus 15L (port) plus 2L (driver), you have 117L total inside volume needed.
The size/volume of the port it's in relation to the materials used, if you use a pvc pipe vs. ply/wood (for a round or square port).
Also the power W used is going to be important for the max. SPL and port noise.
Let's say you are using max. power admissible. So, for a 12.5 cm port (internal diameter) you will need a 111 cm length (yes, 1 meter and 11 cm) for the tuning frequency to be calibrated. You can adjust and test this later, with your final design.
A port built with ply/wood will have a much higher volume that the one I used previously for a pvc pipe. Let's say 30 cm x 5 cm (internal) square port made of 1" ply (it's 35 cm x 10 cm external) will have a volume close to 38L, this only for the port (vs. the 15L of a pipe with ~3mm thickness), putting your final internal (net) enclosure volume in ~140L (100+38+2).
Measure carefully the thickness of the materials used (PVC, ply or MDF) and final volumes and dimensions of parts, internal and external, for an appropriate and calibrated result that matches the one expected by the simulations. Have fun and a lot of infrasound music. 🙂
Speaker Box Volume Calculator / Designer
Alex,
A 2" speaker can produce 10 Hz.
For 16 Hz to sound as loud as 60 Hz (conversational level) requires over 110 dB SPL.
At 10 Hz, that SPL would just be audible, though might make you feel quite queasy after a short time.
You need to define your SPL requirements, listening distance and room construction and size.
Attachments
I guess room gain will take care of that (in a natural fashion way).
He's not in ff. or PA to the masses. 🙂weltersys... but if you insist, be my guest. Maybe there's something that I'm not aware of at this moment or just escaping my priorities/imagination (or OP limitations) for this project, that you can have your say.
(PIC below from TROELS - box simulation and room-gain)
Room Response Calculator - Reflective Accumulation Simulation Software
http://www.diyaudio.com/forums/multi-way/241449-new-program-room-response-simulation.html
Attachments
Tittualex gives no room details.
Put simply, room gain is not assured at all at any specific frequency, as can be seen in actual testing:
Data-Bass[pp_gal]/1/
What SPL does the INFINITY Reference 1262w 12" achieve at 10 Hz and 16 Hz without exceeding Xmax with your BR alignment radiating in half space?
Just dropped by to read the thread and saw this:
In fact, he went a few steps further than you....he put his dollar down.
He's been gracious enough to have me over at his place a couple times now to have a listen (more like an experience rather
).
Throw all you want at it on paper, talk is cheap, but don't discount someone else's design simply because you can't relate to it at a personal level.
Well, for the record..he did.
In fact, he went a few steps further than you....he put his dollar down.
He's been gracious enough to have me over at his place a couple times now to have a listen (more like an experience rather
).Throw all you want at it on paper, talk is cheap, but don't discount someone else's design simply because you can't relate to it at a personal level.
To put the previous post in context (guess is referring to post #18).
That the price spend was excessive for main mortals - 1 project - and the system was decommissioned, after it succeeded and replaced for a standard system with loudspeaker drivers. That's my understanding.
That the price spend was excessive for main mortals - 1 project - and the system was decommissioned, after it succeeded and replaced for a standard system with loudspeaker drivers. That's my understanding.
Hi,
Yes, he's given... (post #26)
INFINITY 1262W DVC
That's for a smallish BR enclosure. It works in a 75L~150L enclosure. Driver is god for a sealed or TL/QW/TH type. It works (simulation/model) in this case anyway, as desire/predicted by the OP. 🙂
Attachments
Just dropped by to read the thread and saw this:
Well, for the record..he did.
In fact, he went a few steps further than you....he put his dollar down.
He's been gracious enough to have me over at his place a couple times now to have a listen (more like an experience rather
Throw all you want at it on paper, talk is cheap, but don't discount someone else's design simply because you can't relate to it at a personal level.
I'm not surprised you were impressed, his fan sub is impressive. For $16200 + taxes it should be impressive. In fact this was my original comment.
I'm not sure what you are upset about. I just said the same results could be had for 1/5 the price with conventional drivers and amps, and the conventional system would require a small fraction of the space a rotary sub needs. I even named the equipment that could beat his system for 1/5 the price. So either disprove my statement or don't accuse me of cheap talk.
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Dear all ,
I have a small doubt regarding the enclosure tuning , as inductor calculated the required enclosure volume , he mentioned that the box tuning (Fb) is 17.6 Hz ,my doubt is that - is this a fixed number for a particular driver because I have read that when we go below the port tuning frequency there will be unloading of the cone , will this cause a loss in efficiency ? and is it possible to tune the BR to 15 Hz as space is not an issue? ( as i will be using this subwoofer mainly along with virtual pipe organ .... I will be regularly hitting 16Hz (32' stop ) and occasionally 8 Hz (64' stop)
regards,
Alex
I have a small doubt regarding the enclosure tuning , as inductor calculated the required enclosure volume , he mentioned that the box tuning (Fb) is 17.6 Hz ,my doubt is that - is this a fixed number for a particular driver because I have read that when we go below the port tuning frequency there will be unloading of the cone , will this cause a loss in efficiency ? and is it possible to tune the BR to 15 Hz as space is not an issue? ( as i will be using this subwoofer mainly along with virtual pipe organ .... I will be regularly hitting 16Hz (32' stop ) and occasionally 8 Hz (64' stop)
regards,
Alex
Alex,
Below box tuning response drops rapidly and excursion rises rapidly.
Tuning to 15 Hz is possible, only about one note down in frequency from 17.6 Hz (assuming your box is actually tuned to that frequency) a but an 8 Hz tone is nearly an octave below, the speaker will "flap" rather than reproduce that fundamental.
I'd suggest tuning to the lowest fundamental or sealing the enclosure, fairly easy to experiment and choose which works better for your room and taste.
I understand that reaching 8Hz with the kind of available driver is impossible, and i dont want to reach that low . But i would like to know the possibility of tuning to 15 Hz . And what should be the power of the amp ( driver RMS-300W , peak-1200W)
regards,
Alex
regards,
Alex
For dynamic music reproduction, an amp with 1200 watt peak capability would be good for your speaker.
That said, continuous organ tones that resemble sine waves could easily burn a 300 RMS speaker driven with 1200 watts.
Tuning to 15 Hz is possible, but won't make much difference .
You can check the tuning now using swept sine wave tones, put a white dot on the cone, at Fb (box tuning) the cone movement will be less than above or below.
You could even use your keyboard as a source, a "B" an octave below the usual lowest B on a grand piano is around 15.75 Hz, 17.6 Hz is only a note or so higher, 15 Hz about a half step below "B".
At any rate, a simulation is only an approximation, measurement tells whether the simulation is accurate. Too high, cut off some port length, too low, lengthen it.
That said, continuous organ tones that resemble sine waves could easily burn a 300 RMS speaker driven with 1200 watts.
Tuning to 15 Hz is possible, but won't make much difference .
You can check the tuning now using swept sine wave tones, put a white dot on the cone, at Fb (box tuning) the cone movement will be less than above or below.
You could even use your keyboard as a source, a "B" an octave below the usual lowest B on a grand piano is around 15.75 Hz, 17.6 Hz is only a note or so higher, 15 Hz about a half step below "B".
At any rate, a simulation is only an approximation, measurement tells whether the simulation is accurate. Too high, cut off some port length, too low, lengthen it.
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