Fane 15-300TC 15" full range speaker based project

[ppataki]

A tiny progress

 

[Plcamp]

This video show results of using a 15” OB driver with 0.7 qts in a sub 100l sealed cabinet…note the superb transient recovery time and max spl that beat smaller drivers by miles.

 

[ppataki]

Unfortunately the cabinets will most likely not be finished this year.....
All the cutouts and the chamfering are done - the only steps missing are the final sanding and the internal bracing
Once those are done (hopefully 1st week of January) I will be able to bring them home

 

[ppataki]

In the meantime, the felt and the vibrodamping sheets are prepared:

The felt is self-adhesive but I am thinking about using Green Glue between the felt and the vibrodamping sheets - maybe it would further reduce vibration....

 

[puppet]

I wouldn't waste money on green glue for the felt.

 

[ppataki]

I wouldn't waste money on green glue for the felt.

Good point, it is just that I have tons of them from a previous project and I am trying to figure out how to use them....

 

[puppet]

By all means .. use the felt, just don't see the need/advantage of adhering it w/green glue. Green glue's purpose is to provide damping effect between two solid surfaces.

 

[ppataki]

By all means .. use the felt, just don't see the need/advantage of adhering it w/green glue. Green glue's purpose is to provide damping effect between two solid surfaces.

Thanks @puppet
I will then save my Green Glue stock for something else in the future

 

[jamescarter1982]

Let me share another project that I am venturing into

A few months ago I managed to buy a pair of Fane 15" full range speakers - unfortunately production of these drivers was stopped earlier this year due to low demand; as far as I know I bought the last pair in Europe
(if anybody knows about any leftover stock in Europe definitely let me know )

So I have decided to start this project now
These beasts would normally require huge boxes (250+ liters each when sealed) so I decided to go for a higher Qtc value and compensate the lows with EQ and amplifier power

Cabinet will be sealed, 65 liters with Qtc = 1
15mm baltic birch plywood (wanted 18mm but it is quite an unobtanium over here these days or freaking expensive)

Here are some simulations:

Max input power will be 90W per channel, that's where the drivers will reach their linear xmax

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At that power I will get 95.4dB at 1m at 24Hz
This is for one speaker so +6dB for two speakers plus room gain which is 15dB in my living room at 24Hz

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Impedance:

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Phase:

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Group delay:

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Of course I will use extensive DSP to correct the magnitude response (it will be much needed anyway...)

Some pictures and a video in the meantime:

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New video by Peter Pataki

photos.app.goo.gl

And some building material:

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The bottle is for scale

Stay tuned!

could you please tell me the equation you used to come up with a 250litre ideal cabinet size . I worked it out and it came to 10500 litres . I must obvs have typed in something incorrectly . thanks

 

[Doodski]

I worked it out and it came to 10500 litres .

That's my kind of speaker! Rock ON!

 

[ppataki]

could you please tell me the equation you used to come up with a 250litre ideal cabinet size . I worked it out and it came to 10500 litres . I must obvs have typed in something incorrectly . thanks

I just used BassBox Pro to calculate the Vb
Be aware that the Qa value (and the desired damping density) has a huge influence on the calculated Vb

 

[jamescarter1982]

I just used BassBox Pro to calculate the Vb
Be aware that the Qa value (and the desired damping density) has a huge influence on the calculated Vb

OK thankyou I'm sure I worked it out before and it came out at 300 litres sealed . I think I'm going to make a box of 300 litres to see how it performes ....why not

 

[mhardy6647]

I just used BassBox Pro to calculate the Vb
Be aware that the Qa value (and the desired damping density) has a huge influence on the calculated Vb

Maybe this is self-evident, but it might be prudent to measure the T/S parameters of the actual drivers one sources before designing, much less building boxes for them.

 

[eddantes]

Maybe this is self-evident, but it might be prudent to measure the T/S parameters of the actual drivers one sources before designing, much less building boxes for them.

https://www.fane-international.com/downloads/Fane-Sovereign-15300TC-DS190618.pdf

Wouldn't the sheet info suffice? The charts state a 975 Litre sealed box.

 

[mhardy6647]

https://www.fane-international.com/downloads/Fane-Sovereign-15300TC-DS190618.pdf

Wouldn't the sheet info suffice?

If it is representative of the actual driver, sure. Otherwise, not necessarily.
Some companies are terrible in terms of the accuracy of their published T/S specs. Others suffer from QC issues in terms of item to item variability.
Some are fine.
Some of the value added in purchasing a 'factory made' loudspeaker can be the manufacturer's selecting drivers sourced from their OEMs to meet their requirements.

Here's a not entirely random example: https://techtalk.parts-express.com/forum/tech-talk-forum/54741-dayton-thiele-small-parameters


In an only slightly different realm, Grado for years (and perhaps still today) made only one, or a few phono cartridges. The more expensive ones were the same cartridge (and stylus, in some cases) as the cheap ones, but selected to meet better specs and/or with tighter tolerances. Their literature was very upfront about this in the '70s and '80s.

 

[mhardy6647]

Fane's test FR data are in a 975 L sealed box (infinite baffle).
I must say, this is a pretty cool looking driver, although I am (heh!) baffled as to how they get the HF extension without a whizzer or aluminum dustcap, or dual compliance surround or some such sorcery. They say something about 'triple cone configuration' but they coyly don't show a photo -- and a quick googlin' didn't turn one up, either.

 

[Rednaxela]

It has two whizzers.

 

[mhardy6647]

Thanks for posting that image! I could not find one on teh webz!?! I, perhaps, should've tried harder... but I was surprised Fane's page on this driver didn't have one.
Nice looking cone(s).

 

[Rednaxela]

Agree many pictures don’t show them very clearly, especially when you don’t know what to look for in the first place.

 

[mhardy6647]

Two whizzers is a really interesting and fairly unusual - possibly unique - approach to the 'full range driver' conundrum!

One of my other favorite approaches was Altec's fairly short-lived 603B driver. This 'full range' driver used an aluminum dustcap (which was a pretty standard trick for HF extension), plus the addition of the front piece of an Altec 604-style horn in front of it to... well, I guess, offer some enhanced dispersion, or something.

source: https://www.lansingheritage.org/html/altec/catalogs/1949.htm

I actually happen to have one of these, in fair-at-best condition, and it doesn't sound bad for a 15" extended range driver. But it sure was an odd approach that never caught on!