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Multi-Way Conventional loudspeakers with crossovers

Tannoy GRF in Walnut
Tannoy GRF in Walnut
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Old 31st July 2016, 12:15 PM   #1
atilsley is offline atilsley  Australia
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Default Tannoy GRF in Walnut

My 10th pair of GRF's...this one in American Walnut, on Euro Birch ply. Extra bracing.

Denim/wool lining.

Plinths 50mm.

Monitor Gold's 15's, with standard xovers.

Sounding fantastic.
Attached Images
File Type: jpg felt inside.jpg (77.3 KB, 262 views)
File Type: jpg bottom on.jpg (79.3 KB, 259 views)
File Type: jpg glue up side.jpg (78.6 KB, 252 views)
File Type: jpg top glue.jpg (78.3 KB, 253 views)
File Type: jpg glue up braces.jpg (76.7 KB, 253 views)
File Type: jpg trim getting started.jpg (66.0 KB, 119 views)
File Type: jpg final polished.jpg (67.2 KB, 152 views)
File Type: jpg final in room.jpg (57.9 KB, 172 views)
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Old 31st July 2016, 01:48 PM   #2
Charles Darwin is offline Charles Darwin  United Kingdom
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Beautiful!

But after 10 pairs don't you think it is about time to take the next step up and try yourself on an Autograph? ;-)
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Old 31st July 2016, 03:19 PM   #3
chrisb is offline chrisb
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Are measured plans for the Westminster available? That'd be a challenge

Just did some minor refinishing on a 1988 era pair of these. Quite a luscious sound with the right upstream gear - in this instance a QUAD QII integrated - a nice little piece as well.
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Old 31st July 2016, 05:53 PM   #4
Bare is offline Bare  Canada
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Yes.. Westy plans are available.. Google Is your friend.
In truth tho I'm surprised by someone building 10? grf's.
Once was more than enough for me
Odd one note bass overpowering the mids.. Not good (bad even) by most yardsticks.
A fairly common observation/result as well.
Mine soon became firewood.
Genuine shame as it involved a lot of work and worse; dashed hopes.
This one reads as promising... I'm considering trying it .. one day ?
truefi: The TrueFi Tannoy Enclosure –*The Manufacture
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Old 1st August 2016, 06:25 AM   #5
atilsley is offline atilsley  Australia
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Charles, I've built these for others...not mine...though I quite enjoy the 'grumbly' nature of the bass.

Bare, that is a very interesting link...look like a great design.

I'd build the Westminster Royal, but not the Autograph...simply too large and time consuming.

Kind regards.

Andrew
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Old 1st August 2016, 06:34 AM   #6
DPH is online now DPH  United States
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Andrew, these are beautiful. Thanks for sharing. I'm something of a huge sucker for all things walnut, to boot.
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Old 1st August 2016, 11:30 AM   #7
Charles Darwin is offline Charles Darwin  United Kingdom
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Quote:
Originally Posted by Bare View Post
This one reads as promising... I'm considering trying it .. one day ?
truefi: The TrueFi Tannoy Enclosure *The Manufacture
Frankly that cab makes very little sense to me.

The acknowledged problem with the GRF is that it throws the frequency response out of kilter by horn-loading the bass but doing nothing for the mids.
Hence the Westminster and Autograph are generally accepted as the better solution as they load the mids requiring just the treble to be padded down a little bit less (compared to a simple vented cab).
If you do nothing to the GRF crossover you end up with the smiley-face eq curve which is quite popular.

This one loads the mids but does even less than a ported box to load the bass. I expect the result to be virtually unlistenable without some major reworking of the crossover. That would require padding the mids back down to the level of the unsupported woofer to get a balanced FR.


Generally OB and Tannoy are not a good combination.
OBs want a high Qts woofer to minimise the need for electronic eq while Tannoys though are very low Qts drivers requiring radically different solutions.
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Old 17th April 2019, 06:29 PM   #8
johnsurnamerobinson is offline johnsurnamerobinson
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Bit of good craftmenship going on there methinks!!!
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