I want to build a pair of full range speakers but the box has to be quite compact it cannot exceed about 7 to 8L volume: smaller is a plus.
The driver must be capable of working well using little power as they will be run using a TA2020 D Class amp, so maybe 12W
They will be used in a 9 X 8 boat cabin.
Ready plans would be a plus for the box design but not necessary.
Most of what I listen to is Relaxed Jazz and Female Vocalist and a bit of Piano.
Most of my music is in FLAC files.
My maximum budget for drivers is about 200-250 at a stretch.
I have loads of plywood and mdf around the house.
The driver must be capable of working well using little power as they will be run using a TA2020 D Class amp, so maybe 12W
They will be used in a 9 X 8 boat cabin.
Ready plans would be a plus for the box design but not necessary.
Most of what I listen to is Relaxed Jazz and Female Vocalist and a bit of Piano.
Most of my music is in FLAC files.
My maximum budget for drivers is about 200-250 at a stretch.
I have loads of plywood and mdf around the house.
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Madisound Speaker Store
Sealed, 8lt -3db 70Hz.
Qtc .75
I figure you want something water and moisture resistant.
Hence the sealed enclosure and non paper cone with no phase plug.
Sealed, 8lt -3db 70Hz.
Qtc .75
I figure you want something water and moisture resistant.
Hence the sealed enclosure and non paper cone with no phase plug.
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Well, personally, I wouldn't port a speaker any higher than 30-40 Hz. Or else you will here the port ringing through the midbase.
I would get the alpair 10 and do an aperiodic enclosure. You could make it 6lt box and still have a butterworth alignment. With a -3 at 70 Hz. With cabin gain, I'm guessing -3 at 40 Hz.
If you want better off axis response, you will need a smaller driver, but then you give up sensitivity and or extension.
I would get the alpair 10 and do an aperiodic enclosure. You could make it 6lt box and still have a butterworth alignment. With a -3 at 70 Hz. With cabin gain, I'm guessing -3 at 40 Hz.
If you want better off axis response, you will need a smaller driver, but then you give up sensitivity and or extension.
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Maybe Alpair 7 (4") or Alpair 6 Metal (3") - you can find quite a few plans here:
Frugal-phile | Box Library / Mark Audio
Frugal-phile | Box Library / Mark Audio
No, not in this case.
We are talking about the box alignment.
Basically, its a flat response with a 2nd order slope. (12db per octave)
Q of. 707
I personally prefer a critically damped alignment, but that requires a large box.
You will get a little bump in midbase with butterworth, but not to much with a corner frequency this high.
We are talking about the box alignment.
Basically, its a flat response with a 2nd order slope. (12db per octave)
Q of. 707
I personally prefer a critically damped alignment, but that requires a large box.
You will get a little bump in midbase with butterworth, but not to much with a corner frequency this high.
Zia, Thank you for that, I am drawn to the larger Alpair 10 driver as I am assuming it will move more air and therefore be capable of producing more bass.
I might be wrong in this assumption, not sure!
Ray
As a generalization maybe, but given the small box size requirement you are going to throttle the A10s in the bass.
dave
Yes, larger drivers are not always the best way to get more base, but I believe in the case of going full range, they will prevent the Doppler effect for high frequencies (garbling) while still being capable of producing base. Where as a smaller driver has to work harder and use more excursion causing more ID.
Also the larger diver is more sensitive for his t-amp. He can get a butterworth 2nd order alignment with 7 lt. If he goes aperiodic, And have a -3 at 40 hz in his small cabin.
Also the larger diver is more sensitive for his t-amp. He can get a butterworth 2nd order alignment with 7 lt. If he goes aperiodic, And have a -3 at 40 hz in his small cabin.
While I am not on top of Thiele Small Parameters and don't pretend to understand them I realize that a larger diaphragm will have the capacity to move more air and will have the potential to produce more bass with less driver excursion.
Conversely a smaller driver with a much greater driver excursion COULD potentially provide more more base if the excursion is great enough.
That's my simplified grasp and I think it's somewhere around correct without to much in the way of mathematics and equations which have the capacity to confuse me terribly.
Conversely a smaller driver with a much greater driver excursion COULD potentially provide more more base if the excursion is great enough.
That's my simplified grasp and I think it's somewhere around correct without to much in the way of mathematics and equations which have the capacity to confuse me terribly.
My sim says 9.2 litre. F3 to 40 hz is making some assumptions about room gain.
But no matter, F3 is mostly meaningless except for the filter theory (Toole), but with an F10 of ~70, and the assumption that aperiodic will bring the Q down to butterworth (enuff damping would as well), 40ish flat is a reasonable guess.
dave
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