Grüß Gott mein lieber ICG!
You have misunderstood my post quoting you and
as a result, there is your sim of a vented cabinet!
Have a look at how one might design a sealed box
with TS parameters of said PE super budget driver.
The solution is to damp the box with sufficient
stuffing. I have not only made it possible in this
sim, I have done it in practice with a woofer that's
even "worse" in the sense of high Qts.
You have misunderstood my post quoting you and
as a result, there is your sim of a vented cabinet!
Have a look at how one might design a sealed box
with TS parameters of said PE super budget driver.
The solution is to damp the box with sufficient
stuffing. I have not only made it possible in this
sim, I have done it in practice with a woofer that's
even "worse" in the sense of high Qts.
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I find sealed boxes more "fun" with a bump around 50-70Hz. Add the bump in room response around approx. 40Hz of a "typically" room in Europa, what's not to like. I want the bump in my speakers in existing room.
I have Visaton AL170 in 15L wide and shallow wall hanged boxes with DSP set at +2.6db, q=3.2 @ 56Hz. It's a far cry from the one note bass as could be.
I would't be surprised if +5.5db as in ICG simulation would sound fun free standing in a big room as mine of 55 sqm...
The anaemic rubbish that audiophiles prefer is not my cup of tea....
Peter
I have Visaton AL170 in 15L wide and shallow wall hanged boxes with DSP set at +2.6db, q=3.2 @ 56Hz. It's a far cry from the one note bass as could be.
I would't be surprised if +5.5db as in ICG simulation would sound fun free standing in a big room as mine of 55 sqm...
The anaemic rubbish that audiophiles prefer is not my cup of tea....
Peter
I don't know how you come to such results, in 30l you get a Qtc of over 1,2 and that is already quite unprecise. A Qtc of 1,06 needs a volume of nearly 80l.
And it gets even worse, because there isn't any serial resistance in it, as soon as you introduce any kind of passive crossover, the needed volume increases even more. I don't see any sense in using a 5$ (+delivery) driver and then spend 30$ or even more on a extremely-low-impedance woofer xo and additional 30 bucks for the enclosures if you can simply buy a bit better chassis and don't have to deal with such high Qtc.
And it gets even worse, because there isn't any serial resistance in it, as soon as you introduce any kind of passive crossover, the needed volume increases even more. I don't see any sense in using a 5$ (+delivery) driver and then spend 30$ or even more on a extremely-low-impedance woofer xo and additional 30 bucks for the enclosures if you can simply buy a bit better chassis and don't have to deal with such high Qtc.
I have already written that the solution was in damping.
You define the losses caused by stuffing with this Qa parameter.
It's not needed to increase the box volume because of introducing
a dcr of a low pass inductor. Dcr of 0,5 would have sligthly increased
the Qtc for about 0,1.
The point of this is not to tell Europeians to buy a 5 dollar
unit, but to be clear what is possible to do with these. It's a myth
that higher Qts drivers are boomy by default. They can be if you
don't do something about it.
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YES, technically, you can.
NO, it doesn't make sense.
You do realize, that is a medium sized driver with a limited excursion? And for 35Hz you have to move a lot of air. According to WinISD the maximum linear excursion is reached at 35Hz at 78dB. It might be off a few dB since there aren't complete parameters available but that's then still not very loud at all. I don't know if the TO likes to hear his music any louder but either it's enough for him and he only wants high SPL because he's using a tube amp, in which case the low - very low dampening factor causes the box to go boom more or he wants to, then that isn't a solution for him at all. Besides that, the voice coil of only 25mm heats up quickly, which means, you get into the power compression quickly, which increases the Qts/Qt further.
I already mentioned you have to deal with a lot of disadvantages when getting very high Qts into the boat. I honestly can't understand why someone would want to do that if you can so easily avoid them by simply buying a little bit better driver. Don't misunderstand me, I'm all for saving money but that's cutting off at the wrong end.
NO, it doesn't make sense.
You do realize, that is a medium sized driver with a limited excursion? And for 35Hz you have to move a lot of air. According to WinISD the maximum linear excursion is reached at 35Hz at 78dB. It might be off a few dB since there aren't complete parameters available but that's then still not very loud at all. I don't know if the TO likes to hear his music any louder but either it's enough for him and he only wants high SPL because he's using a tube amp, in which case the low - very low dampening factor causes the box to go boom more or he wants to, then that isn't a solution for him at all. Besides that, the voice coil of only 25mm heats up quickly, which means, you get into the power compression quickly, which increases the Qts/Qt further.
I already mentioned you have to deal with a lot of disadvantages when getting very high Qts into the boat. I honestly can't understand why someone would want to do that if you can so easily avoid them by simply buying a little bit better driver. Don't misunderstand me, I'm all for saving money but that's cutting off at the wrong end.
Dayton Audio DA215-8 aluminum cone woofer
8", 35 Hz - 8000 Hz, 88.7 dB, USD$32.86 (29.08 Euros)
and it looks down right sexy.
Dayton Audio DA215-8 8" Aluminum Cone Woofer
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