I've decided to build a subwoofer to add extra bass depth to my main loudspeakers. Currently I have Rogers LS5/9 which are 3dB down at about 50Hz. I'm looking to fill the 20Hz to 50Hz gap.
If possible, I'd like the sub to be clean up to 150Hz so that I can use it with a wide range of main speakers.
The priority is clean depth - volume comes second.
I'm tempted to purchase the Reckhorn A-402 as it seems to offer more tweaking than most plate amps.
I don't mind a big box, so I was thinking along the lines of a 15" driver in a sealed cabinet....
What would you guys recommend?
If possible, I'd like the sub to be clean up to 150Hz so that I can use it with a wide range of main speakers.
The priority is clean depth - volume comes second.
I'm tempted to purchase the Reckhorn A-402 as it seems to offer more tweaking than most plate amps.
I don't mind a big box, so I was thinking along the lines of a 15" driver in a sealed cabinet....
What would you guys recommend?
It will depends on your budget.
If your budget is high, I would build a big cabinet using an Acoustic Elegance AV15-X with dual PR18 passive radiators. You can tune that really low, 15 Hz or so.
Since the inductance of the AV15-X is really low, you could cross at 150 Hz without any problems, especially if you center it between your mains, or if you build dual subwoofers.
Good luck !
If your budget is high, I would build a big cabinet using an Acoustic Elegance AV15-X with dual PR18 passive radiators. You can tune that really low, 15 Hz or so.
Since the inductance of the AV15-X is really low, you could cross at 150 Hz without any problems, especially if you center it between your mains, or if you build dual subwoofers.
Good luck !
If you want a 15" that will go low sealed have a look at this:
http://www.bmm-electronics.com/document.asp?document_id=2180&link=datasheets\dayton\RSS390HF4.pdf
That shop is based in the the netherlands too so shipping is cheap and easy to the UK
http://www.bmm-electronics.com/document.asp?document_id=2180&link=datasheets\dayton\RSS390HF4.pdf
That shop is based in the the netherlands too so shipping is cheap and easy to the UK
Yes, that plus:
http://www.linkwitzlab.com/filters.htm#9
should do nicely. Theres a spreadsheet to work out circuit values after you run a sim on Win ISD.
Download the spreadsheet from here:
http://www.trueaudio.com
linkxfrm.xls
http://www.linkwitzlab.com/filters.htm#9
should do nicely. Theres a spreadsheet to work out circuit values after you run a sim on Win ISD.
Download the spreadsheet from here:
http://www.trueaudio.com
linkxfrm.xls
I've played around with the Dayton 15" and also the Peerless 830500 XLS 12".
Here are WinISD plots for the Dayton in a 155L sealed box and the Peerless in a 79L vented box with EBS -6dB alignment.
I know I started off looking at 15" drivers in sealed boxes, but the ported Peerless sub is far flatter from 20-50Hz.
Would the Dayton plus Linkwitz transform be better than the Peerless?
Here are WinISD plots for the Dayton in a 155L sealed box and the Peerless in a 79L vented box with EBS -6dB alignment.
I know I started off looking at 15" drivers in sealed boxes, but the ported Peerless sub is far flatter from 20-50Hz.
Would the Dayton plus Linkwitz transform be better than the Peerless?
Attachments
You're discounting room gain. In most listeniing rooms, room gain can start to be considered around 30Hz increasing to around 10dB at 20Hz, but of course it does depend on the room. For this reason I hope you can see you might well achieve a flatter in room response from the sealed 15".
Also bear in mind that EBS alignments tend to suffer from high group delay which is usually fine for HT but can be a problem if the system is to be used for critical music listening
Alternatively, using the Linkwitz transform circuit linked before will yeald a flatter response for the sealed 15" if thats really what you want
Also bear in mind that EBS alignments tend to suffer from high group delay which is usually fine for HT but can be a problem if the system is to be used for critical music listening
Alternatively, using the Linkwitz transform circuit linked before will yeald a flatter response for the sealed 15" if thats really what you want
Linkwitz Transform also introduce group delay, on the other hand.
If you can afford Peerless drivers, as I said earlier you might want to look at this : http://www.aespeakers.com/phpbb2/viewtopic.php?f=3&t=1715
I think both of your choices would do well but personally I prefer EBS with the Peerless. Just tune the EBS really low and since your box is small, use passive radiators because you can't fit ports long and big enough in that box in my opinion.
Just play with the default EBS enclosure, increase and decrease port size and box size, until you achieve a more gradual rolloff. I don't like the shelf, the small flat part in frequency response, that's usually in the EBS -6 dB default enclosure.
If you can afford Peerless drivers, as I said earlier you might want to look at this : http://www.aespeakers.com/phpbb2/viewtopic.php?f=3&t=1715
I think both of your choices would do well but personally I prefer EBS with the Peerless. Just tune the EBS really low and since your box is small, use passive radiators because you can't fit ports long and big enough in that box in my opinion.
Just play with the default EBS enclosure, increase and decrease port size and box size, until you achieve a more gradual rolloff. I don't like the shelf, the small flat part in frequency response, that's usually in the EBS -6 dB default enclosure.
http://www.bmm-electronics.com/Product.asp?Product_ID=5863
Nice 12" fore closed 30hz, very smooth...
If you go easy on the power it will do 20hz in BR
fore a smaller 30hz BR box consider the smaller 10" brother
http://oaudio.de/Heimkino/-Hifi-Elektronik/Audioprozessor:::144_52.html
With the above very versatile woofers you could easily do a standard 3way
Amps ? ...dont know
Nice 12" fore closed 30hz, very smooth...
If you go easy on the power it will do 20hz in BR
fore a smaller 30hz BR box consider the smaller 10" brother
http://oaudio.de/Heimkino/-Hifi-Elektronik/Audioprozessor:::144_52.html
With the above very versatile woofers you could easily do a standard 3way
Amps ? ...dont know
What about these guys:
www.rythmikaudio.com
From what I've read they deliver very clean deep bass thanks to their servo technology. Im embarking on a DS12 build myself.
Ilkka test results
www.rythmikaudio.com
From what I've read they deliver very clean deep bass thanks to their servo technology. Im embarking on a DS12 build myself.
Ilkka test results
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