Interest Check - Custom Fane 15" Full-Range

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chris661
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Interest Check - Custom Fane 15" Full-Range

Post by chris661 » Fri Sep 07, 2018 1:03 pm

Hi all,

I'm running an interest check first of all.

The Fane 15" full-range driver looks pretty good in a lot of ways, but the T/S parameters make it difficult to work with unless you're willing to put up with a very large cabinet - Qts = 0.7 and Vas is 203L.

I'm thinking of organising a group buy for some upgraded units, and wanted to check interest levels.

I can see a few options here:

A - Same moving parts, just add more magnet
B - More magnet, cast aluminium frame
C - More magnet, cast frame, bigger voice coil aiming for more cone excursion and power handling.
D - Don't bother, the original is fine

I'm not looking for solid commitment or money at this point, but a rough idea of how many you might want to order would be good.

The T/S parameters I'm aiming for are simply to increase BL and drop Qes. That'd mean they'll be much happier in smaller cabinets, and also gain some efficiency.

Here's a quick sim of what we get if we go from the current BL=10.9 to BL=18.9:

Image

This is in a 35L cabinet tuned to 73Hz. I know which I'd prefer.

With the increased BL, you could also go for a larger cabinet in the 100L range, which would give a response that slopes down towards the bass (probably matching room gain curves quite well) with LF extension into the 30Hz range before it rolls off.

So, I can see the improved version being useful for a few different markets:
- High-efficiency home HiFi - add a small valve amp and you're done.
- Professional Audio - stage monitors, main PA, etc.
- High-power home theatre surrounds.

A quick summary of the upgraded product:

- 15" Full-range unit
- Powerful motor means it'll be happy in compact enclosures
- Exceptionally high efficiency - 102dB @ 2.83v in 2pi.
- No need for a crossover
- Possible option for cast aluminium basket
- Uses existing recone materials
- Possible to get very deep bass, but larger enclosures would be needed.


I think that's everything. I've (hopefully) set up a poll so you can tell me what you think of all this.

Cheers all,
Chris

Ant
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Re: Interest Check - Custom Fane 15" Full-Range

Post by Ant » Fri Sep 07, 2018 1:40 pm

Chris if you want a listen to the boggo 15" fane in a sealed box you can drop in one day if you like?

chris661
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Re: Interest Check - Custom Fane 15" Full-Range

Post by chris661 » Fri Sep 07, 2018 1:43 pm

Hi Ant,

That'd be great. I'm in the midst of a house move at the moment so my schedule is all over the place. I'll be in touch when things calm down a little :)

I also saw this: http://www.diyaudio.com/forums/subwoofe ... -34-a.html
Which might be interesting to try. More efficiency, and gets the Qts down to a more useful (IMO) range.

Chris

Ant
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Re: Interest Check - Custom Fane 15" Full-Range

Post by Ant » Fri Sep 07, 2018 1:48 pm

What's he done? Just stuck a neo ring magnet on the back of the driver magnet?

chris661
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Re: Interest Check - Custom Fane 15" Full-Range

Post by chris661 » Fri Sep 07, 2018 3:14 pm

Bunch of small neo magnets around the edge of the ferrite, and used a ruby clip to hold them there as they'll try to repel. Getting the Qes to around 60% of it's starting value is pretty impressive, and it looks to me like he didn't optimise much, either. If that could be repeated (or better) for the Fane 15", it'll go from something that "wants" a big box, to something that'll play okay in a 35L box if you don't want much bass. Given 100L, you could tune down low and get high efficiency down to around 30Hz.

I'm tempted to buy one of the drivers and a bunch of magnets just to play with.

Chris

JohnG
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Re: Interest Check - Custom Fane 15" Full-Range

Post by JohnG » Fri Sep 07, 2018 8:04 pm

I would be interested, as I intend on building the 15" Model.

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