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Multi-Way Conventional loudspeakers with crossovers

The umpteenth large format coaxial driver thread
The umpteenth large format coaxial driver thread
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Old 8th July 2015, 12:23 PM   #21
Adolf Corkscrew is offline Adolf Corkscrew  Finland
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Quote:
Originally Posted by burgunder View Post
In WinISD it will only take 3w to excede xmax at 10hz, 25w at 30hz. That is if im able to use the correct numbers etc.
With my current BMS 12-inch coaxials it only takes 1,5 watts to really **** off my neighbor.

90 litres tuned to 40Hz looks like a promising starting point with the Oberton 15CX. Any experience, anyone? Are their compression drivers any good? At least this would make a really compact loudspeaker for the driver size (I call those 12-inch BMS based speakers of mine "mini monitors").
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Old 8th July 2015, 12:26 PM   #22
burgunder is offline burgunder  Denmark
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It could also be asked if any musicformat have information that low.
Another possibility is a closed box and Linkwitz transform.
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Old 8th July 2015, 12:46 PM   #23
Adolf Corkscrew is offline Adolf Corkscrew  Finland
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^ Aren't the lowest organ notes around 16Hz, or something like that?

I'm starting to gravitate towards the Oberton 15CX... It's cheaper, I can buy it from a trustworthy supplier, and everyone who's tried Oberton stuff seems to give them at least modest praise.
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Old 8th July 2015, 01:08 PM   #24
burgunder is offline burgunder  Denmark
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I don't think you'll find any experience, most of these coaxial threads seems to die without any result.
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Old 8th July 2015, 01:23 PM   #25
Adolf Corkscrew is offline Adolf Corkscrew  Finland
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Well, I didn't find anything on this particular driver, but at least someone here had good experience with their 8-inch coaxial. Others had good experience with their other drivers, giving at least hope that this 15-inch coax would be no different.

But true that these coax threads die off without any end result. Maybe try breaking the tradition this time?

But why am I so obsessed with big coaxes? Well, only one reason: Tannoy Westminster Royal. Easily the most natural drum sound I've ever heard. Easily one of the best commercial speakers I've heard. Those Magicos and Martens I can pass off as "nice", but nothing special. Other 15-inch coaxes do most of the same things I love about the Westminsters, but many PA drivers have flaws that become annoying in the long run. For example the 18sound 15NCX750 falls into this category; very nice but too flawed at the same time.

Now, the big Tannoys aren't flawless. For example I much prefer the treble performance on my current BMS 12C362 pair to any Tannoy. They just don't do enough bass. I could of course use them in a 3-way, which I've considered. But then I'd risk losing the unimitable coherence of a point source.

Actually those 18sounds were already really close to being good enough, but sadly they had a big dip in the upper midband. Still, with a 99dB/W sensitivity, 700 watts of power at hand, at least Infected Mushroom did sound very entertaining.
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Old 8th July 2015, 04:53 PM   #26
Inductor is offline Inductor  Portugal
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Originally Posted by ScottG View Post
To me it looks like a 96 db driver at 1 watt at 180 Hz ("infinite" baffle and volume). At 2.83 volts that should be 93 db at 1 meter.
Ohms? What driver?
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Old 8th July 2015, 05:04 PM   #27
Charles Darwin is offline Charles Darwin  United Kingdom
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Quote:
Originally Posted by Adolf Corkscrew View Post
Now, the big Tannoys aren't flawless. For example I much prefer the treble performance on my current BMS 12C362 pair to any Tannoy. They just don't do enough bass. I could of course use them in a 3-way, which I've considered. But then I'd risk losing the unimitable coherence of a point source.
Not in my experience.

I use 12" Tannoys with 12" woofers crossed at 250Hz.
Didn't lose any of the point-sourciness, just got bass down to 25Hz and audibly cleaner midrange.
The IMO best Tannoy speakers use a similar approach (FSM, 215DMT, Buckingham Monitor and the legendary Dreadnought).

If you like your BMS I'd just get a nice 15" to cover from where you need it to be up to 175-250Hz or so.

Keep woofer and co-axial within 1/4 of the crossover wavelength to be on the safe side.
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Old 8th July 2015, 05:35 PM   #28
Adolf Corkscrew is offline Adolf Corkscrew  Finland
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Actually my backup plan is a three way with the BMS, but with an 18 inch bass. Something like 18Sound 18LW2400. But that's a backup plan if/when all else fails. But these would be almost prohibitively large, and might be too much for the current listening room. Our apartment leaks bass badly, and I wasn't joking when I said I only need 1,5 watts to affect neighbor relations. Couple that problem with the capacity of an 18 inch bass driver...

This is simplicity for simplicitys sake. Because simple is pretty. Or put it another way, I'm still more interested in studying this concept further than moving on to another.
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Old 8th July 2015, 05:49 PM   #29
Inductor is offline Inductor  Portugal
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Adolf,
I know you don't like horns as you stated, but best in the LF department is RCF - CX15G251, followed by drivers Beyma and BMS (Beyma 15CXA400Nd/BMS 15CN682CXNd), for this 3 drivers and enclosure size (BR).
I'm not counting with GPA here I'm sure is one of the best. It's a decision between having a sub or not. Usually they don't go very low.
RCF - CX15G251
Beyma 15CXA400Nd (8+16Ohm)
BMS15CN682L BMS 15 CN 682 - 15" Coaxial Neodymium Speaker 500 W + 80 W 8 Ohm
1977 UREI 813 Studio Monitors | Mixonline
Altec 604 (series))
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File Type: jpeg RCF - CX15G251.jpeg (237.9 KB, 539 views)
File Type: jpg UREI-813.jpg (11.8 KB, 531 views)
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Old 8th July 2015, 05:55 PM   #30
ScottG is offline ScottG  United States
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Originally Posted by Inductor View Post
Ohms? What driver?
..same one I posted, 16 ohms.

(..specifically looking for a 16 ohm driver to parallel for an average nominal 8 ohms and that 6db of gain.)
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