I have several Peerless by Tymphany TC8FD05-04-ND 3" drivers, I want to build boxes for them that I'll use for virtual conferences in a small room of about 10-20 people. Anything that can bump the sensitivity a bit will be cool.
I don't have a lot of experience, but I've made some sealed speakers for small fullrange peerless' and I intend to make more. I have read a lot. If by several you mean more than eight, if it were me I would lean toward 4 on a side arrays in sealed boxes about 16 times Vas, 4 drivers times 4x Vas per driver. I'm not sure these little drivers will cover your room though, probably a question for people with more experience.
I will be happy to get away with 1 driver per box. I can splay them appropriately for even coverage.
I don't think they are fit for it. They have a very bad off axis behaviour (start to beam very fast) and and early roll off on both sides. You need to be able to cover 70H-16kHz clean for this purpose with a 45° dispersion. These don't do that.
I would rather use it's bigger brother the Peerless TC9FD18-08 or something like the Faital 4FE32 or so. And you will need a lot of them to cover that crowd as they need to be able to go above the talking (+/- 100dB in the room) I know from experience as conference technician in the past... A line array could be good for this. But in the place i worked (an international organisation in Brussels) above each seat at the conference table there was a TC9 70v variation (basicly a TC9 with a conversion transfo mounted on) mounted in the ceiling pointing down. This worked flawless, even for conferences of a few dozen people. All were amped from a 70v amplifier in the rack next to the conference system that regulated the microphones (from presenters or translaters in the cabins behind) and the audio from video or presentations on the big beamer.
I would rather use it's bigger brother the Peerless TC9FD18-08 or something like the Faital 4FE32 or so. And you will need a lot of them to cover that crowd as they need to be able to go above the talking (+/- 100dB in the room) I know from experience as conference technician in the past... A line array could be good for this. But in the place i worked (an international organisation in Brussels) above each seat at the conference table there was a TC9 70v variation (basicly a TC9 with a conversion transfo mounted on) mounted in the ceiling pointing down. This worked flawless, even for conferences of a few dozen people. All were amped from a 70v amplifier in the rack next to the conference system that regulated the microphones (from presenters or translaters in the cabins behind) and the audio from video or presentations on the big beamer.
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If only two drivers I think you'll have trouble with power handling, they'll start to distort once you get them loud enough so everyone can hear. This is like what I was thinking, fwiw, trianglular or not
https://www.ejjordan.co.uk/PDFs/Eikona%20Triangular%20Array.pdf
"A problem frequently encountered in theatres, concert halls, churches, lecture theatres etc, is that the sound of live speech or music at the front of the hall is inadequately heard at the back.
Not only is the direct sound level reduced but the proportion of reverberant sound is increased, the combined effects of which are to effectively remove all sound detail. Speech particularly may be rendered quite unintelligible. One approach may be to use loudspeakers distributed throughout the hall, but this alone is unsatisfactory because the sound will always appear to emanate from the nearest loudspeaker instead of the live sound source at the front.
In addition, considerable confusion of sound will result in time delays between loudspeakers and the source. A partial solution is to deliberately introduce time delays in the electrical feed to the loudspeakers, which increase appropriately towards the back of the hall, so that at any point in the hall the sound from the nearest speaker is in phase with that from the live source. This technique is expensive and not completely satisfactory.
A totally effective solution to this problem can be provided by the use of two specifically designed multiple arrays correctly positioned at the front of the auditorium.
Obviously, such arrays may have to handle very considerable power levels especially in large auditoria where the power may run to several kilowatts. In the past, such loudspeakers would need to be extremely large, heavy and unesthetic in appearance, making correct positioning difficult."
TNT-Audio inter.views Ted Jordan
https://www.ejjordan.co.uk/PDFs/Eikona%20Triangular%20Array.pdf
"A problem frequently encountered in theatres, concert halls, churches, lecture theatres etc, is that the sound of live speech or music at the front of the hall is inadequately heard at the back.
Not only is the direct sound level reduced but the proportion of reverberant sound is increased, the combined effects of which are to effectively remove all sound detail. Speech particularly may be rendered quite unintelligible. One approach may be to use loudspeakers distributed throughout the hall, but this alone is unsatisfactory because the sound will always appear to emanate from the nearest loudspeaker instead of the live sound source at the front.
In addition, considerable confusion of sound will result in time delays between loudspeakers and the source. A partial solution is to deliberately introduce time delays in the electrical feed to the loudspeakers, which increase appropriately towards the back of the hall, so that at any point in the hall the sound from the nearest speaker is in phase with that from the live source. This technique is expensive and not completely satisfactory.
A totally effective solution to this problem can be provided by the use of two specifically designed multiple arrays correctly positioned at the front of the auditorium.
Obviously, such arrays may have to handle very considerable power levels especially in large auditoria where the power may run to several kilowatts. In the past, such loudspeakers would need to be extremely large, heavy and unesthetic in appearance, making correct positioning difficult."
TNT-Audio inter.views Ted Jordan
I have 8 units. Was thinking maybe 2 units in front of the seating area and 2 on the sides.
It seems like a good time to do some testing, wire up a taped or hot glued together cardboard or foam core box, stick it up on a wall and see what happens..
If you need more output, you will only get it by series-parallel wiring groups of four.
If you make two mini lines and put them against the corners, up to the ceiling, you will gain wave support from three boundaries. And being as far as possible from everyone, you will both avoid phase issues and not blast out the near for the benefit of the far.
Try a cardboard or foamcore model, as tansand said. A simple baffle, top and bottom pieces(triangular cross-section to start, pull one side out if you need to create a dip to fix a peak in the range that would affect).
For your purposes you might get away without EQ or contour filters.
If you make two mini lines and put them against the corners, up to the ceiling, you will gain wave support from three boundaries. And being as far as possible from everyone, you will both avoid phase issues and not blast out the near for the benefit of the far.
Try a cardboard or foamcore model, as tansand said. A simple baffle, top and bottom pieces(triangular cross-section to start, pull one side out if you need to create a dip to fix a peak in the range that would affect).
For your purposes you might get away without EQ or contour filters.
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