Need A Design - Small (11-12L volume) & High(ish) Output

speaker · 20th November 2008, 01:11 PM

I would like to build a set of compact club-type party speakers. Something along the lines of an EAW JF60z or JBL Control. Internal volume in the 11-12 liter range and using a 130mm woofer. I won't be using them with a subwoofer all the time so I would like to get some impression of bass from them but it can cut-off fairly high to keep efficiency up. I am thinking a vent tuning around 75Hz. So, where to start? Can anyone point me in the direction of a similar project or make driver recommendations?

rcw · 20th November 2008, 02:36 PM

The QB5 II reflex alignments give maximum output as they allow simultaneous maximisation of both voice coil dissipation and cone excursion, details here..

http://sound.westhost.com/qb5align.htm

The auxiliary filter found in 5.1 systems can be used when using a subwoofer, if used with no filter at all the alignment has a punch region peak that is good for giving the impression of bass.
rcw.

mayhem13 · 21st November 2008, 02:20 AM

The B&C 8ndl51 woofer seems like the perfect choice for your given size. Efficiency and power handling are very high at 93.5db and when tuned to 70hz in 12 liters yields and f3 around 63hz or so. 200 watts yields average output around 114db with below tuning excurion reaching xmax around 56hz...lending toward an 80hz xover with a steep filter. I'm working on a pair myself with a vifa dx25 dome tweeter in a modified 6.5 inch waveguide to achieve my 1.4khz xover goal.

speaker · 21st November 2008, 11:49 AM

Quote:

Originally posted by rcw

http://sound.westhost.com/qb5align.htm

Thank you for the link. Although I will admit it is far over my head. I am really just trying to find a passive design already made that I can build somewhat quickly. I want to make this set of speakers as a gift.

speaker · 21st November 2008, 11:50 AM

Quote:

Originally posted by rcw

The B&C 8ndl51 woofer seems like the perfect choice for your given size. Efficiency and power handling are very high at 93.5db and when tuned to 70hz in 12 liters yields and f3 around 63hz or so. 200 watts yields average output around 114db with below tuning excurion reaching xmax around 56hz...lending toward an 80hz xover with a steep filter. I'm working on a pair myself with a vifa dx25 dome tweeter in a modified 6.5 inch waveguide to achieve my 1.4khz xover goal.

This is sounding about right. I am not familiar with the B&C woofer line however. Where are they available? Also, do you have a crossover design you are reasonably happy with yet?

mayhem13 · 22nd November 2008, 03:27 AM

Still working with them...but getting closer. Trying to get the Bass alignment right first with different volume/tuning. Try USSPEAKER.Com for the complete B&C line. The Neo drivers are all really well designed.

speaker · 22nd November 2008, 12:50 PM

Thank you for the lead.

Does anyone else have any ideas for a speaker like this?

20th November 2008, 01:11 PM	#1
speaker diyAudio Member Join Date: Mar 2004 Location: USA	Need A Design - Small (11-12L volume) & High(ish) Output I would like to build a set of compact club-type party speakers. Something along the lines of an EAW JF60z or JBL Control. Internal volume in the 11-12 liter range and using a 130mm woofer. I won't be using them with a subwoofer all the time so I would like to get some impression of bass from them but it can cut-off fairly high to keep efficiency up. I am thinking a vent tuning around 75Hz. So, where to start? Can anyone point me in the direction of a similar project or make driver recommendations?

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20th November 2008, 02:36 PM	#2
rcw diyAudio Member Join Date: Jul 2005 Location: sydney nsw	The QB5 II reflex alignments give maximum output as they allow simultaneous maximisation of both voice coil dissipation and cone excursion, details here.. http://sound.westhost.com/qb5align.htm The auxiliary filter found in 5.1 systems can be used when using a subwoofer, if used with no filter at all the alignment has a punch region peak that is good for giving the impression of bass. rcw.

21st November 2008, 02:20 AM	#3
mayhem13 diyAudio Member Join Date: Sep 2008	The B&C 8ndl51 woofer seems like the perfect choice for your given size. Efficiency and power handling are very high at 93.5db and when tuned to 70hz in 12 liters yields and f3 around 63hz or so. 200 watts yields average output around 114db with below tuning excurion reaching xmax around 56hz...lending toward an 80hz xover with a steep filter. I'm working on a pair myself with a vifa dx25 dome tweeter in a modified 6.5 inch waveguide to achieve my 1.4khz xover goal.

22nd November 2008, 03:27 AM	#6
mayhem13 diyAudio Member Join Date: Sep 2008	Still working with them...but getting closer. Trying to get the Bass alignment right first with different volume/tuning. Try USSPEAKER.Com for the complete B&C line. The Neo drivers are all really well designed.

22nd November 2008, 12:50 PM	#7
speaker diyAudio Member Join Date: Mar 2004 Location: USA	Thank you for the lead. Does anyone else have any ideas for a speaker like this?

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