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PostPosted: Sat Jan 28, 2017 4:01 pm 
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Joined: Mon Apr 26, 2004 2:33 pm
Posts: 3185
Location: Toronto, ON, CA
There seems to be a lot of raw 15-inch Tannoy drivers for sale these days, often with crossovers. (Either that, or I just notice what interests me!)

For anyone who's picked up a pair of these drivers—HPD-385, HPD-385A, 3828, 3859, 3839 and some others—I thought I'd mention an easy, Tannoy-tested, cabinet design, originating in Canada, that enables one to enjoy the post-Gold, pre-DMT 15" Dual Concentrics without resorting to massive floor-standing cabinets.

Basically, decades ago, some engineer at CBC stuck a 15" Dual Concentric driver into a 123 litre (4.5 cu.ft.) cabinet, tuned to 40-42 Hz. He liked the results and had Manley Labs in California do a critical assessment. They were also impressed.

With dimensions of 26.5 x 19.75 x 18.5 inches and (in the case of the factory cabinets), a weight of 77 pounds, these were hardly petite "bookshelf" designs, but they do nicely on (robust) 18-22" stands and don't dominate a room. (An extremist could, of course, perch them on subwoofers, and in studios they often did, but that's a different direction.)

Eventually, Tannoy came out with a commercial implementation of the original CBC design designated the SGM-15B. It was spec'd at 95 dB sensitivity (half-space; 92 dB anechoic); 125 W continuous, 250 W programme and 500 W peak power handling, and 40 Hz to 20 kHz frequency response (+/- 4 dB).

It was a later addition to the Super Gold Monitor (SGM) series, but it doesn't appear in any of the spec sheets and brochures for that series. At least not in any that I've been able to access online.

To my ears, the SGM-15B combines the musical coherence associated with "classic" Tannoy Monitor Gold drivers with some of the transient "snap" that I, at least, associate more with the later DMT series of monitors.

The essential data for cabinet-building are the external dimensions, given above, plus the following addition information:

— Tannoy used 25 mm MDF for the front and back panels, with 18 mm MDF for all the others. If I were building new cabinets, I'd be inclined to go for 1" birch plywood all round, or laminates of 0.50" plywood and 0.50" MDF. On the other hand, the SGM-15B I'm listening to as I type sound just fine in the original factory cabinets. So long as you keep the same internal volume, the exact materials and thickness of the panels is up to the builder. But suffice it to say that the designers were aiming for a non-resonant cabinet rather than one that contributes to the music like the resonating chamber of a violin or guitar.
— Two identical round ports above the driver: 3" diameter, 2 7/16" long.
— Driver is flush mounted.

Anyway, FWIW, there it is. . .


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PostPosted: Tue Jul 04, 2017 9:30 pm 
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Joined: Sun Nov 02, 2008 1:03 pm
Posts: 97
Location: Victoria, BC, CA
I designed a trapezoidal miniOnken for HPD385 for a studioin the US. ~22x21x12” (wxhxd) so even smaller. Reportedly quite good.

dave

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Community sites: Transmission Line Speakers | Frugal-Horns | Frugal-phile — Commercial site: planet10-hifi


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PostPosted: Wed Jul 05, 2017 4:24 am 
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Joined: Thu Oct 30, 2008 8:08 am
Posts: 979
Location: burlington, ON, CA
I have not heard the 15 inch tannoy's. Bill Woods is Acoustic Horn Company and a crossover designer The photo is of Bill Woods in the 70's


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Last edited by speedy1 on Tue Mar 13, 2018 10:21 am, edited 4 times in total.
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PostPosted: Wed Jul 05, 2017 4:40 am 
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Joined: Thu Jan 13, 2011 11:29 am
Posts: 636
Location: St.Catharines, ON, CA
Bernie likes em.


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PostPosted: Wed Jul 05, 2017 2:06 pm 
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Joined: Sun Nov 28, 2010 5:56 pm
Posts: 1334
Location: Milton, ON, CA
I currently have both. I have the 604E and the Tannoy 3836 in large inert ported cabinets. The Tannoy does the frequency extremes better, it goes higher and goes lower. But it also still has a bit of that warm bass bump. Most of that sound is from the crappy cabinets they build but some of it is still part of the drivers sound. I believe it's because they have a heavier cone. The Tannoy will be pleasant a crossed a wider variety of bad recordings. The Altec does horizontal dispersion of the high frequencies better. Personally I prefer the alTec combined with a sub woofer just a touch More than the Tannoy but they're both pretty awesome. They are both better than about 99.9% of the stuff you will here at Taves. And I'm even talking about the price no object stuff.


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PostPosted: Wed Jul 05, 2017 4:08 pm 
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Joined: Thu Aug 03, 2006 4:43 pm
Posts: 680
Location: Ottawa, ON, CA
speedy1 wrote:
Am I dreaming or did someone actually use silver wire to build a speaker driver to help push/pull the cone instead of copper or aluminum used today?


B&W did... The Silver Signature. And not just the voice coil, but the crossover inductors, capacitors, all the internal wiring and the binding posts....


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PostPosted: Wed Jul 05, 2017 6:01 pm 
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Joined: Wed Apr 06, 2005 10:18 am
Posts: 4669
Location: Surrey , BC, CA
and.........http://www.6moons.com/industryfeatures/phy/phy.html


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PostPosted: Thu Jul 06, 2017 8:19 am 
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Posts: 1334
Location: Milton, ON, CA
libor wrote:

I love to try a pair of these!


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PostPosted: Thu Jul 06, 2017 2:05 pm 
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Joined: Thu Oct 30, 2008 8:08 am
Posts: 979
Location: burlington, ON, CA
What a lovely post. Bill Schnee, for his latest studios uses 604E and his old partner Doug Sax built the crossovers.


Last edited by speedy1 on Tue Mar 13, 2018 10:23 am, edited 1 time in total.

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PostPosted: Thu Jul 06, 2017 2:55 pm 
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Joined: Thu Jan 13, 2011 11:29 am
Posts: 636
Location: St.Catharines, ON, CA
Big Reds


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PostPosted: Fri Jul 07, 2017 7:28 am 
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Posts: 979
Location: burlington, ON, CA
Here is Bill SchneeBILL SCHNEE AND DOUG SAX VERSION OF 604E AND STUDIO far larger I believe than Big Reds ever were.

Note-I coild not copy or paste a photo using every/any extension, so here is the web adress and if anyone knows how to get the photo into this chat, please do.

http://schneestudio.com/


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PostPosted: Fri Jul 07, 2017 7:57 am 
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Joined: Thu Jan 13, 2011 11:29 am
Posts: 636
Location: St.Catharines, ON, CA
Now Larrabee.

Gary


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