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-   -   onken as a near field monitor (http://www.diyaudio.com/forums/full-range/188620-onken-near-field-monitor.html)

togril 8th May 2011 01:07 PM

onken as a near field monitor
 
hello everyone.

Have been trying to gather some feedback about directions, so going to be more specific now:

I guess this may be for Mr planet 10 - but:
Would a fonken work well as a near/mid field monitor? And specifically, would it work well with a TB W5-1611SA - 5inch?

Thanks!
T:usd:gril.

steviedon 8th May 2011 01:38 PM

As there are many iterations of the onken, which one are you referring to? I suspect the smaller ones would work very well NF, but the flange of the TB w5-1611 is likely too large for the chamfered baffle micro/milli/prime. This driver has alot of potential IMO, and deserves a dedicated design. I may just get to work on one.

togril 8th May 2011 11:10 PM

Yes - trying to work out the itterations of the Fonken familly. Basically the Prime I think:
http://www.diyaudio.com/forums/full-...pair-born.html

What would be required to work out the sizes - I found a calculator link on a thread here - but 'tis dead.
I also believe there is potential, but limited budgets mean I can't really experiment that much.
Fonkens are just so NICE!

planet10 9th May 2011 02:40 AM

Every driver has a specific miniOnken/Fonken.

I'd have to run the numbers to see if this driver could be made to work.

dave

vinylkid58 9th May 2011 03:39 AM

1 Attachment(s)
Quote:

Originally Posted by togril (Post 2565276)
Would a fonken work well as a near/mid field monitor? And specifically, would it work well with a TB W5-1611SA - 5inch?

Using WinISD, the W5 looks pretty good in an 18 liter box, F3 at 50Hz. With 6 vents, each one would measure 100mm x 9.0mm x 283mm long.

BTW, this is Q3B tuning, not real Onken tuning.

jeff

togril 9th May 2011 04:38 AM

Thanks Dave and VynilKid58.
I am extremely interested in building this.
Is there an amount of "chuffing" with the fonken/onken port design? (port noise)

Am also assuming that the length of port is dictated by the "inner" wall (behind the battons)?

50hz is quite respectable for me.

planet10 9th May 2011 05:27 AM

We've not had any chuffing issues with our builds... vent wants to be long.

dave

togril 9th May 2011 08:31 AM

Quote:

Originally Posted by planet10 (Post 2565996)
We've not had any chuffing issues with our builds... vent wants to be long.

dave

Excellent.
If I can ask, would the panel width and be the same 12mm / 1/2inch for the larger 18ltr cabinet? (and wool felt thickness)...

.....Actually, I have just been looking at the fonken plans, and realise i't's not just a case of altering the internal volumes and internal "walls" (vent length?).

Well, I'm still very keen to give it a go.

t:usd:gril

Scottmoose 9th May 2011 12:25 PM

Actually, the Fonken isn't a 'real Onken' either. The Onken can trace its lineage back through the Jensen Ultraflex to Thuras's original BR, & it's principle goal is to use its massive vent system to provide maximum efficiency at Fb. Dave's Fonkens, despite their similar appearance, use their high aspect ratio vents to provide something more akin to an aperiodic alignment.

At a fundamental level, all vented cabinets are tuned by altering their Vb and vent dimensions to achieve a desired tuning alignment with a given drive unit. Whether that merits a 'just' is rather more open to question though, as this, except in the case of drivers which are drop-in replacements for one already used in a given enclosure, essentially means 'design a new cabinet from scratch.'

togril 11th May 2011 12:43 PM

Quote:

Originally Posted by vinylkid58 (Post 2565940)
Using WinISD, the W5 looks pretty good in an 18 liter box, F3 at 50Hz. With 6 vents, each one would measure 100mm x 9.0mm x 283mm long. BTW, this is Q3B tuning, not real Onken tuning.
jeff

Well, Ive tried the following tools: BassBox6, WinISD (seems well used here) , the Onken XLspreadsheet calculator, and a 3D package (maya) and I can't get any of the numbers to work. Not bad for a noob!
Mainly it comes down to fitting the vents in and still having enough width on the baffle. Can get either one, but not the other. Ive been squishing 3D boxes until my eyes bleed.
...Now I realise I could ......ok.... am missing many things here, but I can't see a way of making it fit.

Balls : )
Tog.


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