Hello. I recently bought a pair of faulty Sonus faber cremona at a reasonable price.
The seller adviced me that I should change midrange drivers because they were not working and that is what happens.
I’d like to buy a pair of discounted Sonus Faber Cremona midranges labeled WOF030001.
They look like scan speak revelador series as you can see in the pictures.
Does any of you has a pair for sale?
Alex
The seller adviced me that I should change midrange drivers because they were not working and that is what happens.
I’d like to buy a pair of discounted Sonus Faber Cremona midranges labeled WOF030001.
They look like scan speak revelador series as you can see in the pictures.
Does any of you has a pair for sale?
Alex
Hi,
drivers may be repairable after all. Can you check whether the fault is open circuit (voice coil measuring infinite resistance) or short circuit (measuring zero ohms)? You would do that with a multimeter.
Original units labeled SF may be prohibitively expensive, so you could investigate which Scan Speak equivalent is this driver. There is 15M and 15W models, either 4 or 8 ohm.
I would expect 15M-4 ohm, but I can't say for sure.
Can you show the crossover board?
drivers may be repairable after all. Can you check whether the fault is open circuit (voice coil measuring infinite resistance) or short circuit (measuring zero ohms)? You would do that with a multimeter.
Original units labeled SF may be prohibitively expensive, so you could investigate which Scan Speak equivalent is this driver. There is 15M and 15W models, either 4 or 8 ohm.
I would expect 15M-4 ohm, but I can't say for sure.
Can you show the crossover board?
I'm not any expert in speakers not building them.
I just bought these speakers at a good price and the seller told me the problem was the voice coil broken at some point.
The drivers are not in good condition, dust cap has been damaged and pushed and I have asked to Sonus Faber dealers for price, but it looks that it is going to be very difficult to find them because they are discontinued.
I don't think they can be repaired because the former owner tried to do it and the speaker is in bad condition. Coils wires are broken and I suppose that it has to be changed.
I don't know who will be able to do that and, in case it can be done. Anyway the looking of these midranges are terrible and I would like to replace them.
Regarding to crossover, this is the picture I could get
I just bought these speakers at a good price and the seller told me the problem was the voice coil broken at some point.
The drivers are not in good condition, dust cap has been damaged and pushed and I have asked to Sonus Faber dealers for price, but it looks that it is going to be very difficult to find them because they are discontinued.
I don't think they can be repaired because the former owner tried to do it and the speaker is in bad condition. Coils wires are broken and I suppose that it has to be changed.
I don't know who will be able to do that and, in case it can be done. Anyway the looking of these midranges are terrible and I would like to replace them.
Regarding to crossover, this is the picture I could get
Thanks for the photo.
It may appear to be difficult to find a replacement scan speak driver, but I suspect not really. You should find a person, a repair electronics guy or someone in this field to measure the voice coil dc resistance. If it's a broken connection, then it's likely to be in the area where copper braid is attached to a thin voice coil wire. If you can take a photo of this driver from the side where these wires can be clearly seen, I'll make a mark on the photo where the measurement should be taken.
I have asked for this crossover picture in order to reverse engineer the schematic which might make the job easier to assess the nominal impedance of the faulty unit, but the crossover should be taken out completely and of good resolution. The one you have taken is too blurry.
It may appear to be difficult to find a replacement scan speak driver, but I suspect not really. You should find a person, a repair electronics guy or someone in this field to measure the voice coil dc resistance. If it's a broken connection, then it's likely to be in the area where copper braid is attached to a thin voice coil wire. If you can take a photo of this driver from the side where these wires can be clearly seen, I'll make a mark on the photo where the measurement should be taken.
I have asked for this crossover picture in order to reverse engineer the schematic which might make the job easier to assess the nominal impedance of the faulty unit, but the crossover should be taken out completely and of good resolution. The one you have taken is too blurry.
Well, as I said before, I'm not very good with this and i don't feel comfortable dismounting everything. Sorry.
I would appreciate if somebody can ponit me to a pair of new (or slightly used) midranges.
thank you
I would appreciate if somebody can ponit me to a pair of new (or slightly used) midranges.
thank you
Hi. I had a pair of midwoofers that came out of sonus faber auditor stand mounts and they were same sonus code as yours. So this are mid woofers not midranges and they measured exactly same as revelator 15w/4531.
Hello.
I have something to say here from my own experiences.
ScanSpeak 15W/4531G00 and Cremona midrange are not the same.
I have measured both in my Cremonas (the ones that Moretty bought) and, as can be seen in the following pictures, Cremona midrange has more sensitivity from 1KHz (+3dB at 3KHz)
Not Gathed:
5ms Gathed
It is the same with impedance plot, the Cremona midrange has a lower Fs point.
Regarding to the crossover... I bet the components (at least the coils) comes from Jantzen Audio. They are Cu 0,8mm and CU 1mm for the bass section.
The ones with discs are fro bass and a notch to the mid.
The ones for Tweeter and midrange driving the main signal are air core (Cu 0,8mm)
Capacitors are "standard" MKP 5% tolerance (like cross cap ie) and for bass section there is a 100uF electrolytic cap.
The crossover is soldered to a PCB:
I have drawed the crossover (sorry, no values)
I have something to say here from my own experiences.
ScanSpeak 15W/4531G00 and Cremona midrange are not the same.
I have measured both in my Cremonas (the ones that Moretty bought) and, as can be seen in the following pictures, Cremona midrange has more sensitivity from 1KHz (+3dB at 3KHz)
Not Gathed:
5ms Gathed
It is the same with impedance plot, the Cremona midrange has a lower Fs point.
Regarding to the crossover... I bet the components (at least the coils) comes from Jantzen Audio. They are Cu 0,8mm and CU 1mm for the bass section.
The ones with discs are fro bass and a notch to the mid.
The ones for Tweeter and midrange driving the main signal are air core (Cu 0,8mm)
Capacitors are "standard" MKP 5% tolerance (like cross cap ie) and for bass section there is a 100uF electrolytic cap.
The crossover is soldered to a PCB:
I have drawed the crossover (sorry, no values)
Does Sonus Faber not sale spare chassis for there speakers? This would be the first address were I would ask for a replacement chassis. I have done this with two other speaker manufacturers and never had a problem. But maybe Sonus Faber handles this in another way.
For replacement speaker you can use stock scan speak drivers and crossover readjusted (both low pass circuit and resistor lowered by 1.4ohm) but speaker will not sound the same as originals( will be slower,less sharp. which is not a good,considering mellowish and slowish original sonics. ) been there, done that. Both with sonus faber and wilson audio (the former had 4db higher sensitivity than stock scan speak unit. it actualy had benefit of changing midrange to "slower")
Hi Raelman, Do you still have this driver. Thanks a lot in advance for your answer.Moretty, here you have some pics from the sourced unit.
Regards, Rob
Hello.
Yes, I still have the unit.
THe voice coil was replaced because it was broken when I bought It.
I sent to a professional company that I work with and now It measures and works perfectly, but you should know that has been repaired.
After repairs (more than one year ago) the unit was tested and placed on my shelf
Yes, I still have the unit.
THe voice coil was replaced because it was broken when I bought It.
I sent to a professional company that I work with and now It measures and works perfectly, but you should know that has been repaired.
After repairs (more than one year ago) the unit was tested and placed on my shelf
Hi Realman, Thanks for your quick reply!
Ok, did you Check the unit after repair? Does it work properly?
As Long as they used original parts ok for me. Do you have the invoice of the company which repaired it? How much do you want for the driver?
Best regards
Rob
Ok, did you Check the unit after repair? Does it work properly?
As Long as they used original parts ok for me. Do you have the invoice of the company which repaired it? How much do you want for the driver?
Best regards
Rob
Hi raelman, are you able to PM me ?Hello.
I have something to say here from my own experiences.
ScanSpeak 15W/4531G00 and Cremona midrange are not the same.
I have measured both in my Cremonas (the ones that Moretty bought) and, as can be seen in the following pictures, Cremona midrange has more sensitivity from 1KHz (+3dB at 3KHz)
Not Gathed:
5ms Gathed
It is the same with impedance plot, the Cremona midrange has a lower Fs point.
Regarding to the crossover... I bet the components (at least the coils) comes from Jantzen Audio. They are Cu 0,8mm and CU 1mm for the bass section.
The ones with discs are fro bass and a notch to the mid.
The ones for Tweeter and midrange driving the main signal are air core (Cu 0,8mm)
Capacitors are "standard" MKP 5% tolerance (like cross cap ie) and for bass section there is a 100uF electrolytic cap.
The crossover is soldered to a PCB:
I have drawed the crossover (sorry, no values)
I need some help with the crossover but not able to send PMs. (?)
Many thanks in advance.
mikeabramson@hotmail.com
Happy New Year
This thread is a bit old, but I found it super interesting and useful. I have got the same problem as one of my Cremona midrange (not the mid woofer) stopped working (no continuity). I managed to remove it from the cabinet using the suggestions above (fantastic). I have a couple of questions though:
1. There are two 4 Ohm Scan Speak possible replacements:
(a) 15M/4531K (b) 15W/4531K
The physical measurements are the same as the Cremona driver; however, the frequency response are indeed different with the 15M being about 3dB more sensitive.
https://doc.soundimports.nl/pdf/brands/Scan-Speak/15M4531K00/15m-4531k00-data-sheet.pdf
https://doc.soundimports.nl/pdf/brands/Scan-Speak/15W4531G00/pdf_Scan-Speak_15W4531G00_1.pdf
Am I correct to infer that the driver used by SF is the 15M ?
2. I understand that there has been "customization" by SF in Italy. However, am I correct to think that the customization was mainly about the cross-overs? These drivers really look identical...
Thanks in advance!
Andy
This thread is a bit old, but I found it super interesting and useful. I have got the same problem as one of my Cremona midrange (not the mid woofer) stopped working (no continuity). I managed to remove it from the cabinet using the suggestions above (fantastic). I have a couple of questions though:
1. There are two 4 Ohm Scan Speak possible replacements:
(a) 15M/4531K (b) 15W/4531K
The physical measurements are the same as the Cremona driver; however, the frequency response are indeed different with the 15M being about 3dB more sensitive.
https://doc.soundimports.nl/pdf/brands/Scan-Speak/15M4531K00/15m-4531k00-data-sheet.pdf
https://doc.soundimports.nl/pdf/brands/Scan-Speak/15W4531G00/pdf_Scan-Speak_15W4531G00_1.pdf
Am I correct to infer that the driver used by SF is the 15M ?
2. I understand that there has been "customization" by SF in Italy. However, am I correct to think that the customization was mainly about the cross-overs? These drivers really look identical...
Thanks in advance!
Andy
its easy to check by lifting vc to see height of VC. i cant remember exactly but I am 100% sure that cremona and cremona M used diferent midrange VC heights .one used long coil and other short. which used which I am not sure. but if memory served me well older non M model used LONG coil for midrange.this is important (to choose corect lenght) as if chosen diferent frequency response will be diferent and xover transfer function also(because diferent inductance) good luck with your repairs!