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#1 |
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diyAudio Member
Join Date: Jun 2004
Location: constanta
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I have a Boschmann V-10df loudspeaker, 10",4ohms.The parameters are:
Fs = 35.4954 Zmax at Fs = 17.8432 Sd=0.039 Bl=8.4123 N0 (ref. eff.)=0.26 Qms=3.0122 Qes=0.8151 Qts=0.6415 Vas=48.2047 Cms (compliance?)=295.3870 Mms (total mass)=68.0621 Mmd(diafragm mass)=64.4732 Xmax=4 The results with 3 programs, showed me that i must use a box of approx. 225l liters.Isn't that too much for a loudspeaker with it's size????I have approx the same result for sealed or vented box. |
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#2 |
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diyAudio Member
Join Date: Jun 2004
Location: constanta
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i forgot to say that for this box the Qtc will be about 0.7
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#3 |
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diyAudio Member
Join Date: Jun 2004
Location: constanta
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i forgot to say that for this box the Qtc will be about 0.7
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#4 |
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diyAudio Member
Join Date: Dec 2003
Location: Nottingham UK
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The driver Qt is 0.64, so you will need a big sealed box to have a total box Q of 0.7. Perhaps allowing a higher system Q might be OK?
This is assuming a sealed box, as a unit with a Qt this high isn't ideal for a reflex enclosure. |
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#5 |
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diyAudio Member
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I'm thinking the sub is designed for infinite baffle aplications.
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#6 |
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diyAudio Member
Join Date: Jun 2004
Location: constanta
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For a 0.8 Qtc i need a 3.006 f^3 (86liters).What will be the difference?Is there a significant difference?As i understood, a lower Qtc will give a louder bass.Is that right?
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#7 |
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diyAudio Member
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and from what I remember, Qtc lower than 7 means lower deep bass extension, your sub goes lower (that's using a box bigger than the one with Qtc 0.7) and also less power handling.
with a Qtc of greater than 7, there is a bump in the bass response which adds a little more bass but not deep bass. and power handling is increased (smaller box). |
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#8 |
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diyAudio Member
Join Date: Dec 2003
Location: Nottingham UK
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Here is a comparison of your driver in a 50L box (Q=0.9 showing a resonant peak), and in a 200L box (Q=0.715 showing a smooth roll-off).
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