closed sub -> open baffle ?

hilbren · 31st January 2006, 08:55 AM

Hello i've build a closed subwoofer for the lower frequenties that my esl's can't handle.

but, the sub is sounding a bit booming...

so i was thinking about making is it open baffle by making really big hole on the backside of the subwoofer?

size is 42 by 42 by 57 cm's
weight 36 kilo's
driver: http://www.speakertrade.com/car-hifi...kel=AXX%201212

is that audible?

richie00boy · 31st January 2006, 09:39 AM

If you are finding it boomy I suspect that there is an issue with the room and/or the integration with your main speakers and there is no need to cut your subwoofer. Try moving the subwoofer around. How are you driving the sub and what filters and EQ etc are you using? Details of the subwoofer as well would be helpful...

hilbren · 31st January 2006, 09:57 AM

Quote:

Originally posted by richie00boy
If you are finding it boomy I suspect that there is an issue with the room and/or the integration with your main speakers and there is no need to cut your subwoofer. Try moving the subwoofer around. How are you driving the sub and what filters and EQ etc are you using? Details of the subwoofer as well would be helpful...

Well i gave the dimensions and i gave a link to the specs of the driver...
I moved the subwoofer around for some time now, but nothing helps.

richie00boy · 31st January 2006, 12:02 PM

OK I see the link now, but what about your filters etc?

hilbren · 31st January 2006, 01:18 PM

actually i don't have any filter, the only filter that is present is the one in my receiver.

richie00boy · 31st January 2006, 01:42 PM

Which I would be willing to bet money on is the cause of your problems. You need a proper filter matched to your main speakers.

simon5 · 1st February 2006, 04:29 AM

I think richie00boy is right, it seems you doesn't have a lowpass filter because your subwoofer is strong over 80 Hz. It's also overboosted in that range. Try lowering the gain of the subwoofer maybe.

I doubt going dipole would help much, but you could try...

richie00boy · 1st February 2006, 07:20 AM

I think the receiver has a low-pass filter, but it will be the typical 80Hz 2nd-order, which is probably not the best match for his main speakers. IMO going dipole is not addressing the real problem, if it even solves it at all.

hilbren · 7th February 2006, 04:07 PM

I found it hard to believe it would be because there is not a filter present.

So I tested some more and found out it was my own (dc coupled) amplifier.
For now I am using a regular stereo amplifier.

but what i was wondering, is there somebody ho has listed all available sub amplifiers?
I am looking for something with a compact class D amplifier (no frequentie deformation fuctions)

richie00boy · 7th February 2006, 05:25 PM

The UcD modules are easy to assemble into a power amp, and Hypex are based in your country.

I can also say that I have had great results with ZAPpulse modules from LC Audio.

31st January 2006, 09:39 AM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	If you are finding it boomy I suspect that there is an issue with the room and/or the integration with your main speakers and there is no need to cut your subwoofer. Try moving the subwoofer around. How are you driving the sub and what filters and EQ etc are you using? Details of the subwoofer as well would be helpful... __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

31st January 2006, 12:02 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	OK I see the link now, but what about your filters etc? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

31st January 2006, 01:42 PM	#6
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Which I would be willing to bet money on is the cause of your problems. You need a proper filter matched to your main speakers. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

1st February 2006, 04:29 AM	#7
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	I think richie00boy is right, it seems you doesn't have a lowpass filter because your subwoofer is strong over 80 Hz. It's also overboosted in that range. Try lowering the gain of the subwoofer maybe. I doubt going dipole would help much, but you could try... __________________ DIYaudio for President !

1st February 2006, 07:20 AM	#8
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I think the receiver has a low-pass filter, but it will be the typical 80Hz 2nd-order, which is probably not the best match for his main speakers. IMO going dipole is not addressing the real problem, if it even solves it at all. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more


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31st January 2006, 01:18 PM	#5
hilbren diyAudio Member Join Date: Jul 2003 Location: utrecht	actually i don't have any filter, the only filter that is present is the one in my receiver.

7th February 2006, 04:07 PM	#9
hilbren diyAudio Member Join Date: Jul 2003 Location: utrecht	I found it hard to believe it would be because there is not a filter present. So I tested some more and found out it was my own (dc coupled) amplifier. For now I am using a regular stereo amplifier. but what i was wondering, is there somebody ho has listed all available sub amplifiers? I am looking for something with a compact class D amplifier (no frequentie deformation fuctions)

7th February 2006, 05:25 PM	#10
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The UcD modules are easy to assemble into a power amp, and Hypex are based in your country. I can also say that I have had great results with ZAPpulse modules from LC Audio. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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