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Old 15th February 2006, 10:52 AM   #1
Glen1 is offline Glen1  Australia
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Join Date: Oct 2005
Default Sub design - need a little advice

Hi Guys,
I took the plunge a little while ago and built a sub using a Peerless 12" XLS 830500 driver in 47 litre ported box with a 90 mm port 75 cm in length ported to the front. The box is made from 32 ml mdf and I have a 14" square room. I'm using a 180 wrms plate amp to run the sub. I have found that this design allows the response to go really low but at times doesn't have the 'punch' I desire. The amount of bass produced is fine and the low end response seems pretty good but I'd like the sub to have a bit more dynamic 'punch'. I have tried it in a smaller 38 litre box with a 90 mm port 50 cm in length and this seemed to have a little more 'punch' but the bottom end just wasn't there. I've poured over Winpro for hours but as this is my first attempt I'm looking for a little advice.

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Old 15th February 2006, 11:06 AM   #2
Did it Himself
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Location: Gloucestershire, England, UK
It would seem you like to hear a peaky bass. Stick with your bigger box and tuning (although I feel the vent diameter is too small) and play with the upper cutoff frequency and level to see if that helps. Failing that, build a parametric EQ, just one will do.
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Old 15th February 2006, 11:35 PM   #3
JRace is offline JRace  Canada
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Location: Vernon, BC
Punch is most often Mid bass (100-500Hz approx).

What is your x-over settings, and what speakers are you using to suplement the sub?
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Old 16th February 2006, 05:06 AM   #4
Glen1 is offline Glen1  Australia
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Join Date: Oct 2005
Cross over is 80 hz and I'm using Epos M22 for mains and M8 for centre. Mains and centre run as 'small'. HT amp is HK AVR 635.
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Old 16th February 2006, 05:59 AM   #5
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Join Date: Mar 2004
Location: Melbourne, Australia
Have you tried stuffing the port for a sealed enclosure response?
It may be a group delay or room-integration issue that could be helped with 12dB rolloff. An easy experiment worth trying.
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