SONUS FABER CONCERTO MK1 CROSSOVER UPGRADE

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OSIB16

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SONUS FABER CONCERTO MK1 CROSSOVER UPGRADE
« on: 24 Jan 2023, 07:17 pm »
I recently acquired a nice pair of Sonus Faber Concerto bookshelf speakers. They are the more desirable Mark 1 version. Amazing condition, with real walnut and leather cabinets. These things have got some serious potential, so I’m looking forward to upgrading the crossovers, including some modifications to the internal cabinet structure, which will add overall strength, and significantly reduce vibrations.










Here is a list of the tasks below…


1) REPLACE EXISTING FILM CAPACITORS

2) REPLACE RESISTORS

3) NEW UPOCC NEOTECH WIRE (TEFLON SLEEVES REMOVED AND SUBSTITUTED WITH PURE COTTON)

4) ALL WIRING TREATED WITH DEOXIT TO PREVENT ANY FUTURE OXIDISATION.

5) SPEAKER CABLE HARDWIRED DIRECTLY TO CROSSOVER.

6) NEW WIRE INDUCTORS.

7) CHANGE FROM BIWIRE TO SINGLEWIRE.

OSIB16

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Re: SONUS FABER CONCERTO MK1 CROSSOVER UPGRADE
« Reply #1 on: 24 Jan 2023, 07:20 pm »















S Clark

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Re: SONUS FABER CONCERTO MK1 CROSSOVER UPGRADE
« Reply #2 on: 24 Jan 2023, 08:03 pm »
Whichever of those iron core inductors goes directly to the woofer, I'd replace with an air core.  Certainly upgrade the tweeter cap and resistor. 
Iron core inductors, sand cast resistors... not what you'd hope for in a $2K bookshelf speaker. 
Hope you got a good deal on them. 

OSIB16

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Re: SONUS FABER CONCERTO MK1 CROSSOVER UPGRADE
« Reply #3 on: 24 Jan 2023, 08:25 pm »
S Clark,
            Bought them for £415 (UK STERLING). The seller delivered them to me in person. The small red colour Iron Core Inductor is closest to the woofer, and agree with you about swapping it for an Air Core. However I will also replace the remaining inductors for Air Cores. I wonder if Sonus Faber will let Know know their Millihenri values? Will probably have to send them off to be properly measured. Do you reckon I should swap the 3.3uf Film Cap on the tweeter for a 2.2uf cap like the Mundorf Supreme Silver Gold?

OSIB16

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Re: SONUS FABER CONCERTO MK1 CROSSOVER UPGRADE
« Reply #4 on: 24 Jan 2023, 08:26 pm »
I would like to fix that dip in the treble

S Clark

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  • a riot is the language of the unheard- Dr. King
Re: SONUS FABER CONCERTO MK1 CROSSOVER UPGRADE
« Reply #5 on: 25 Jan 2023, 05:15 am »
I would like to fix that dip in the treble
That first dip looks like a phase issue... possibly the result of the first order crossover on the tweeter. If you had a way to measure it, I'd try reversing the polarity on the tweeter and see what happens.   As far as testing the Henry measurements of the inductors, it would be as cheap to buy a meter as it would be to send them to be measured.
 https://www.amazon.com/Honeytek-Capacitance-Capacitor-Electronic-Measuring/dp/B08LYM533X/ref=sr_1_28?crid=23BAAB8QF5MHV&keywords=capacitance+multimeter&qid=1674623561&sprefix=capacitance+m%2Caps%2C314&sr=8-28

That looks like a nice woofer.  Contact Danny Richie to see if he has a crossover upgrade available for these speakers.  He's about as good as anyone in the business on passive crossover design. 

OSIB16

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Re: SONUS FABER CONCERTO MK1 CROSSOVER UPGRADE
« Reply #6 on: 25 Jan 2023, 09:39 pm »
That first dip looks like a phase issue... possibly the result of the first order crossover on the tweeter. If you had a way to measure it, I'd try reversing the polarity on the tweeter and see what happens.   As far as testing the Henry measurements of the inductors, it would be as cheap to buy a meter as it would be to send them to be measured.
 https://www.amazon.com/Honeytek-Capacitance-Capacitor-Electronic-Measuring/dp/B08LYM533X/ref=sr_1_28?crid=23BAAB8QF5MHV&keywords=capacitance+multimeter&qid=1674623561&sprefix=capacitance+m%2Caps%2C314&sr=8-28

That looks like a nice woofer.  Contact Danny Richie to see if he has a crossover upgrade available for these speakers.  He's about as good as anyone in the business on passive crossover design.


Thanks for the tip, valuable info. However; Jeff’s going to help me get these things up and running.

jbl

Re: SONUS FABER CONCERTO MK1 CROSSOVER UPGRADE
« Reply #7 on: 26 Jan 2023, 10:33 pm »
You may also want to try adding a bypass capacitor for the tweeter and woofer.  Can really improve SQ.  I just helped my friend add two to his Spatial M4's.  Dramatically increased the size of the sound stage, increase detail and decay.  A significant improvement for a speaker that already sounds fantastic.