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Old 7th October 2009, 08:27 PM   #1
st_eloi is offline st_eloi  Netherlands
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Default Sub to Compliment mFonkens

Hello, it's been a while.

I am thinking of building a sub to go with my mFonkens.

Click the image to open in full size.

After some research, I would like to use this Drayton plate amp and possibly this Drayton 10" driver

What do the experts think of the choice? I've looked into European suppliers for plate amps, but even after shipping PE comes out cheaper, unless anyone knows a supplier I missed...

I have a mac, so I can't run any of the modelling apps out there, can someone suggest the correct cabinet size, ported or un-ported?

With the line level input/output of this sub-amp, can I add it between my passive pre-amp and diyParadise Charlize 2? Does anyone have any suggested projects I may have missed? I love building things, but the technicalities of cabinet design elude me, so I prefer to trust in the knowledge of others.

Thanks for the help,

David
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Old 7th October 2009, 10:46 PM   #2
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Wow, those are beautiful!

Have you tried Parallels? I THINK it is a free Windows emulator. I am a Windows user myself, but I think a couple Mac-using friends said it was good.

I can gladly help you with the WinISD box calculations. First though, what are your contraints?
- What is the maximum size for an enclosure that you are willing to put up with?
- Ported subs are great for getting more low frequency extension, but you must be very careful about feeding them frequencies below the tuned one...over-excursion can happen (WinISD can estimate this, though).
- How low DO you want to go with frequency response (at what frequency do you want to be at -1dB?)?
- Would a maximum ripple of +/-1dB be acceptable (or 0.5, or 1.5) in the response?
- Do you plan to deliver 100W RMS to it at any point, or will you be staying below this (depends on the sensitivity of the other drivers)?
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Old 8th October 2009, 12:00 AM   #3
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depends how big a cab you can stand and how low you want to go; Unibox gives sealed 65L for an F3 of ~50Hz. The same cab ported & tuned to 25Hz will give an F3 of 37Hz.
For max flatness down to 24Hz, you'll need 150L !!! tuned to 25Hz
If that's too big I'd suggest looking at some 8" drivers, these will have lower Vas and hence more acceptible (to me) cabinet size

Can you run Micro$oft Excel on a Mac? if so, you can use Unibox...
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Last edited by PeteMcK; 8th October 2009 at 12:07 AM.
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Old 8th October 2009, 05:41 AM   #4
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The mFonken was designed using software on a Mac (simulator in Classic thou)...

I would recommend using a woofer with more extended top than a dedicated subwoofer, it will give you a much better chance of getting good integration. I've seen quite a few mentions of Visatons from Europeans lately. Vifa, Peerless, SEAS, Monacor are also probably worth looking at.

For a sub amp, the hot deal are the surplus NHT plate amps that Jack Hidley is selling... http://www.diyaudio.com/forums/showt...96#post1234996 ... $35 each -- the master cartons have 2 in them. I bought 10 of them, They work well.

dave
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Old 8th October 2009, 05:46 AM   #5
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Quote:
Originally Posted by PeteMcK View Post

Can you run Micro$oft Excel on a Mac?
Excel was originally written for the Mac... It was in V3 before it appeared under Windows.

<rant>I am forced to use it, it is really a POC. If he doesn't already have it, not worth the entry $$$ just to run UniBox</rant>

Does UniBox run under Open Office (available for Mac as well as NeoOffice which is a version of OpenOffice with more Mac UI added)

I should try UniBox in Numbers... (part of iWorks, really good value for $$$)

dave
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Old 8th October 2009, 05:52 AM   #6
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Quote:
Originally Posted by bmwman91 View Post

Have you tried Parallels? I THINK it is a free Windows emulator.
Both Parallels and VMWare Fusion run ~$80 USD. Fusion is the better product. They are not emulators. They are Virtual Machines. An Intel Mac is required to run them. Any Intel Mac runs Windows natively using Boot Camp. A number of PC magazines have rated the Mac with Boot Camp as the best Windows machines available. Running Windows under Fusion is even slicker.

dave
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Old 8th October 2009, 08:33 PM   #7
st_eloi is offline st_eloi  Netherlands
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Dave, I like the sound of a mid-bass box with more coverage than just a sub-bass. Last night I found a German website selling loads of excellent drivers, but the plate amps are still a little expensive. Here it is, if you can ignore the frighteningly bad layout, they have a lot of nice equipment. They have Visatron drivers here, I was thinking of the WS20E or W200S.

Can you direct me to a similar mid-bass project, or suggest a good (not too expensive) driver? I think I'm going to go with the PE amp, as it has line level out as well as in.

Regrading cab sizes, I would like to keep it compact, below 35x35x35 (14"x14"x14") anyway. It's mostly for music, with some film watching, so I would like to keep the bass tight rather than huge or super low.

David
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Old 8th October 2009, 10:29 PM   #8
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Quote:
Originally Posted by st_eloi View Post
Hello, it's been a while.

I am thinking of building a sub to go with my mFonkens.

Click the image to open in full size.

After some research, I would like to use this Drayton plate amp and possibly this Drayton 10" driver


David
I made a sub using that plate amp but using the neo 8" Tang-Band woofer also available at P-E. It's a rather small box and with an EBS alignment should be flat to 32 Hz.
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Old 8th October 2009, 10:46 PM   #9
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Consider one of these:

http://www.reckhorn.com/index.php?ln=en&prod=f1

The XO in those plate amps is better than nothing, but it still isn't very nice. This unit sounds much better than the xo in the plate amp I have. And it would let you use a full range amp that you might have laying around somewhere.

I bought one of these a while back and have been pretty happy with it. I have dreams of rolling the opamps in it at some point...
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Old 9th October 2009, 02:39 AM   #10
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Quote:
Originally Posted by st_eloi View Post

W200S
15 litres Q = 0.7 F3 = 70Hz, F10 = 40 Hz
24 litres Q = 0.58 F3 = 75 Hz, F10 = 36 Hz

dave
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