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FANE 12-250tc FULL RANGERS

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Hartmut View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hartmut Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2018 at 2:00pm
Thank you Hemisphere,
 
maybe I could build them as cubes and stack and twist them depending on the Situation.
 
A subwoofer is not planned so far. The first use would be in my very small rehearsal room, but also usable for small acoustic gigs (no miked drums...). In order to have good Keyboard sounds 50Hz would be nice to have.
 
Not sure how to calculate the Reflex tunnel. Any idea?


Edited by Hartmut - 01 June 2018 at 2:01pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2018 at 2:20pm
Stacking and twisting cubes sounds like a better option to me. Depending on your carpentry skills you should consider trapezoid shape rather than a cube. This helps to reduce standing waves inside the box. 

WinISD is a good free program for simulating bass ports.

There's a bit of a learning curve but it doesn't take much to get a basic reflex box simulation going, it depends how much you want to optimise the design (some tunings will be more suitable for a driver, allowing for greater output before distortion, or having an efficiency curve well balanced for the typical energy distribution of your music).

The other thing to know is that reflex port simulations are not reliable. They usually overestimate the length needed (possibly because other parts of the box unintentionally extend the length of the port, and it's difficult to guess by how much - the simulation program doesn't take that into account as it has no idea where you'll put the port), so you should design a port in such a way that it can be trimmed during construction after testing port tuning.

One good way of doing this is to use 'stock' plastic pipe style ports with a flare at one end, these can be much more easily trimmed than a wooden port.

If you have a microphone capable of recording with some precision and can take it somewhere without interference from wall reflections for testing, that will help a lot, in tuning the port and in general. 'Room EQ Wizard' can be used to output various data plots from tests recorded with a microphone.


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Hartmut View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hartmut Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2018 at 3:24pm
Thank you, WinISD works really very well.

And, presuming a compact housing it shows the limitations of physics.  65 Hz @ -3dB in a 36 litre housing is not that bad I guess, but at the same time I have a +3dB peak at 100..150 Hz which might result in a wobby bass.

Ok, next step will be to order one chassis for test purpose. I have an old Peavy monitor which could profit from a new chassis, anyway.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2018 at 5:09pm
A +3dB bump at 120Hz will give a strong kick drum. It's not a bad place to have a little peak and many compact commercial boxes do.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hartmut Quote  Post ReplyReply Direct Link To This Post Posted: 02 June 2018 at 1:07pm
Hmm, sounds not bad. I guess I will give it a try as soon as these speakers are available again in Germany. The good thing about it is that the costs are really low as no filter is required. Or does anyone use a filter to reduce the +4 dB above 5 kHz? I guess this shouldn´t be much of a problem.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 02 June 2018 at 1:41pm
It will definitely sound bright on axis if you don't.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hartmut Quote  Post ReplyReply Direct Link To This Post Posted: 03 June 2018 at 10:08pm
hmm, I did some simulations with Visatons Boxsim but had to put in the T&S parameters manually. The simulation showed rather a peak between 1...5 kHz instead of too loud trebles as expected from the Fane datasheet. I’m a bit confused now, but anyway will give it a try.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 03 June 2018 at 10:14pm
Simulation software can't model the whizzer cone of the Fane driver. It's effectively a coaxial driver and the T/s parameters only model the large cone.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hartmut Quote  Post ReplyReply Direct Link To This Post Posted: 04 June 2018 at 12:32pm
So that best I can do is try and trust my ears (which is not the worst attempt to me).
I guess if I´d try a RC-circuit e.g. with 10 uF + 5 Ohms parallel to the speaker this might be a good starting point.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 04 June 2018 at 1:14pm
Or if you have some studio equipment you can record the frequency response with Room EQ Wizard as I mentioned. A USB audio interface and any reasonably professional microphone will do.

It should be possible to tame the HF with in-line components like you say, not something I really know about, but the information is out there!


Edited by Hemisphere - 04 June 2018 at 1:15pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote leoandsmokey Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2018 at 6:40am
Originally posted by Dub Specialist Sound Dub Specialist Sound wrote:

Thanks again all

nice reads them Bob

thanks fatfreddie for the input /msg

so i think around 40/45 litres is the one then

thanks

How did you go with these?  Did you end up making some small trap cabinets?  Interested in your thoughts.  Thanks,
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2018 at 8:26pm
Tbh leo , not yet havent got around it yet, so busy building boxs atm

will update asap
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