Huge box for 10" - HELP
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 Multi-Way Conventional loudspeakers with crossovers

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 6th July 2004, 10:47 AM #1 hazardu   diyAudio Member   Join Date: Jun 2004 Location: constanta Huge box for 10" - HELP 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.
 6th July 2004, 10:53 AM #2 hazardu   diyAudio Member   Join Date: Jun 2004 Location: constanta i forgot to say that for this box the Qtc will be about 0.7
 6th July 2004, 11:06 AM #3 hazardu   diyAudio Member   Join Date: Jun 2004 Location: constanta i forgot to say that for this box the Qtc will be about 0.7
 6th July 2004, 11:15 AM #4 Ouroboros   diyAudio Member     Join Date: Dec 2003 Location: Nottingham UK 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.
 6th July 2004, 11:25 AM #5 djQUAN   diyAudio Member   Join Date: May 2004 Location: manila I'm thinking the sub is designed for infinite baffle aplications.
 6th July 2004, 11:38 AM #6 hazardu   diyAudio Member   Join Date: Jun 2004 Location: constanta 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?
 6th July 2004, 11:52 AM #7 djQUAN   diyAudio Member   Join Date: May 2004 Location: manila 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).
Ouroboros
diyAudio Member

Join Date: Dec 2003
Location: Nottingham UK
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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