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Multi-Way Conventional loudspeakers with crossovers

Sonus Faber Grand Piano Domus
Sonus Faber Grand Piano Domus
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Old 12th January 2016, 06:05 PM   #1
Nikon1975 is offline Nikon1975  Austria
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Default Sonus Faber Grand Piano Domus

Dear All,

Does anybody have the schematic of the x-over of the Grand Piano Domus ?
They do not have the post for bi-amping and I was trying to understand if this would be possible isolating sections of the x-over.

Thanks,

Davide
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Old 16th March 2016, 05:34 PM   #2
Nikon1975 is offline Nikon1975  Austria
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Nobody?
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Old 16th March 2016, 06:05 PM   #3
Lojzek is offline Lojzek  Croatia
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It has to be possible. I presume you have the speakers at your disposal
to do whatever you want? Take the crossover board out and post a photo
from both of the sides with markings which wires go where.
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Old 17th March 2016, 02:55 AM   #4
eriksquires is offline eriksquires  United States
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From looking at the review measurements, that speaker needs more than just biamping. You should be prepared to do a full analysis of the speaker and either remake the crossover, particularly the mid to tweeter portions, or correct for it in DSP.

Having said that, you can always add your own cable connectors and wire them to the drivers directly, bypassing the existing crossovers completely. I suspect once you open it up you won't find much you'll want to keep anyway.

It's rare that a speaker has such engineering gaffs that a Stereophile review shows it, but it happens. This was one example.

Best,


Erik
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Old 17th March 2016, 07:18 AM   #5
Lojzek is offline Lojzek  Croatia
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SF Concerto Grand Piano isn't exactly SF Grand Piano Domus.
Although, you're right that CGP has room for electrical improvements,
the beauty of the SF cabinets is almost unsurpassing. Italian school
of design.
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Old 17th March 2016, 08:39 AM   #6
Nikon1975 is offline Nikon1975  Austria
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Quote:
Originally Posted by eriksquires View Post
From looking at the review measurements, that speaker needs more than just biamping. You should be prepared to do a full analysis of the speaker and either remake the crossover, particularly the mid to tweeter portions, or correct for it in DSP.

Having said that, you can always add your own cable connectors and wire them to the drivers directly, bypassing the existing crossovers completely. I suspect once you open it up you won't find much you'll want to keep anyway.

It's rare that a speaker has such engineering gaffs that a Stereophile review shows it, but it happens. This was one example.

Best,


Erik
My speakers are the model after what you posted. I attach the only measurements I found, but I suspect a similar problem.
I suspect that it's not too different and I have the experience that they sound quite good when corrected with a tool like Audissey, but with no correction it's like a chorus where everybody sing on his own.
They actually improve if the bass reflex duct is reduced in diameter or even closed.
They look nice, so I'd like to try to redesign the crossover to improve it, but it would be a first time with me, so I am open to guidance !!

Can you elaborate on what do you think are the issues of this speaker looking at the graphs ?

Thanks,

Davide
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Old 17th March 2016, 09:00 AM   #7
Nikon1975 is offline Nikon1975  Austria
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The attachment
Attached Files
File Type: pdf SF_DOMUS_UAV_806.pdf.pdf (220.2 KB, 192 views)
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Old 18th March 2016, 02:29 AM   #8
system7 is offline system7  United Kingdom
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It's quite a pretty speaker mechanically.

TBH, I'd view the heavy 2.5 way bass response as being potentially irritating.

Hence your tendency to block the reflex port.

But, TBH, without a schematic of the crossover, it's hard to suggest an improvement, though diyaudio.com people are good at this sort of thing. First order is all very well, but tends to high distortion with complex program material. Bi-amping is hardly going to get you out of the hole.
Attached Images
File Type: jpg Sonus Faber Grand Piano Domus FR.JPG (36.1 KB, 1702 views)
File Type: jpg SF Grand Piano Domus cabinets.JPG (10.9 KB, 1454 views)
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Old 18th March 2016, 07:08 AM   #9
peteleoni is offline peteleoni  United States
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I think you have some very beautiful boxes there. You could build a nice set of speakers with them, and who knows the drivers may well be usable as well.
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Old 18th March 2016, 08:45 AM   #10
Nikon1975 is offline Nikon1975  Austria
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What would be the right course of actions ? I can take the filter off and draw a schematic.
The drivers are Seas, I think, I'll take note of the model.

Then ?

Thanks,

Davide
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