Sonus Faber Cremona HYBRID Clone - diyAudio
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Old 1st February 2014, 10:10 AM   #1
raelman is offline raelman  Spain
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Default Sonus Faber Cremona HYBRID Clone

Hello everybody in a sunny and shiny day from Spain:

Introducing myself (already done in the appropriate forum) I’m Alberto, a 40 years old Guy who, not knowing almost nothing in the Speaker’s DIY world, has started his own project after 2 years willing to do it.

My aim is to clone the Sonus Faber Cremona Speakers but with a very low budget… let me explain:

I’ve been a long time crazy for the Cremona’s, but no way to buy them even in the used market, so thanks to one of my friends, I bought a used pair of Monitor Audio Gold Reference GR60 floorstanding speakers, that I have to say they sounds me like angels singing….

Monitor Audio Gold Reference 60 Floorstanding Speakers reviews - Audioreview.com

Speaker Asylum: REVIEW: Monitor Audio GR 60 Speakers by O'Shag

http://www.htguide.com/forum/showthr...-B-amp-W-804-S

A Review of the Perfect Loudspeaker: Monitor Audio Gold Reference 10 - Archived Threads 2001-2004 - Home Theater Forum

But I don’t like how they look all:

Click the image to open in full size.


So, with my tight budget I thought I colud use the drivers and Xover from the GR60’s inside my cremona’s enclosure. After some tests and looking for lots of information I decided I would do something like this: my Hybrid Cremona’s:

Click the image to open in full size.

And… the fact is that I designed from the beginning all the CAD drawings and everything and sent the drawings to a Computer cutting and milling, because the guys who had built the Cremona’s Clone in Spain constructed them by adding lots of layers to build the enclosure, but I was sure I wouldn’t be able to do like that and I thought it was easier, faster and much more safe to build them rib by rib, and the fact is that I was in the right way. I will add some pictures of building process later.
When I designed all the stuff I did with the following parameters:
Very similar volumes that the GR60’s but compatible volumes to the BIG_AL Cremona’s Clone… who knows if I will build with this drivers (that was my first opinion, but the budget is quite expensive for me)

Click the image to open in full size. vs Click the image to open in full size.

I have already built the enclosure. It took me about 12 hours of gluing ribs from 5 to 5 and putting all the together to build the full enclosure (It took about 10 days leaving 24hours to dry each glued portion). This is the result (still not veneered):

Click the image to open in full size.
Click the image to open in full size.

And what happens now? Well, I have to say I’m really satisfied with the result and I’m very close to the starting point of this project long time ago: deciding whether or not to use my GR60’S drivers and Xover or a new drivers configuration, and here you are my options for you to give me your suggestions:

1.- Using the Cremona’s drivers and Xover (or the ones designed by my Spanish Friend) that is for each speaker: Morel Supreme Tweeter + Audiothecnology C-Quence 15 H 52 06 13 SD midrange + 2x Scanspeak 18W8531G00 woofers. All this stuff, Xover included and selling my GR60’s would be a $2100 investement (1550€). The pros is that this is a superb configuration, it sounds PERFECT and the Xover is already designed. The con is the hugh amount of money I don’t want to Spend.

2.- Build my own configuration accdording to my budget. For each speaker: Seas 27TDFC-H1189 Tweeter + SEAS MCA15RCY-H1262 mid + 2x SEAS U18RNX-H1571 woofers. All this stuff, adding a Behringer DCX2496 ultradrive pro Xover to avoid the passive Xover desing, and adding the mic and external sound card for measurement, all inclusive and selling my GR60’s would be a $410 investement (300€). The pros: no much expenses (I could rise my budget in drivers up to $675 or 500€). The cons: adding a new electronic device (The DCX2496) and lots of hours of measurement) and I don’t know the results… until I spend the money and test everything.

3.- Using the GR60’s stuff. The cheapest option, the worst looking but I’m pretty sure I will really have a good sound.

Do you think I will get more sound performance with options 1 or 2 or any other option you can suggest me?

I accept all your suggestions about drivers and Xovers, even if they are different to my ideas, but I need something tested and fully working and don’t want to test Xovers because I would become crazy for sure.

Thanks everybody for looking.
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Old 1st February 2014, 12:13 PM   #2
Lojzek is offline Lojzek  Croatia
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I would leave Monitor Audio as it is. If you are satisfied with
the way they sound, good reason not to do anything about them.
Since you do not like its looks and your new boxes are half way
done, you might try to take Monitor's guts with everything out
and install them into a new one. Do your best to copy each part
of Monitor's inside solutions and apply it to Cremona box. Keep
the original boxes in case of a sale.
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Old 1st February 2014, 04:22 PM   #3
raelman is offline raelman  Spain
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My Cremona's design is based on the Monitor Audio box.
Volumes are:

MonitorAudio: 44liter for woofers and 4,4 liters for Tw+Mid
My Cremona's: 46liter for woofers and 4,7 liters for Tw+Mid

I think is should work OK because inside width is the same, althoug the inide depth is bigger in my cremona sinmce thy have a "roundede" shape instead ob the square box for the M.A.
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Old 2nd February 2014, 09:29 AM   #4
raelman is offline raelman  Spain
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Default Building the Enclosures

Hello again.

I'm beginning to post the work done at Christmas, because the last January I could do nothing because of my work and wondering what to do with drivers as I said in the first post.

I guess I can re-start the building in a week.

First of all, here you are all the stuff manufactured with CNC. All the pieces has been made from DM 30mm depth:

Click the image to open in full size.

First of all a huge sand to all the ribs with a steel brush to get a better contact surface with the glue.

Click the image to open in full size.

Then I started the assembly and glueing using wood spikes to assemble rib to rib:

Click the image to open in full size.

Click the image to open in full size.
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Old 2nd February 2014, 07:51 PM   #5
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Why don't you do it right and use the correct Scan Speak drivers and a copy of the original crossovers? They might as well sound as good as they look.
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Old 2nd February 2014, 08:31 PM   #6
raelman is offline raelman  Spain
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Yes, that's what I should do, but its a lot of money and I 'm not really sure if that money will give me more than a 10-15% performance or better sound...
Evenmore, I really havent found the original Xover, but an Spanish mate made a clone and a good filter.

Anyone has the filter with the XT25?
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Old 3rd February 2014, 02:59 AM   #7
_henry_ is offline _henry_  Australia
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i think what are you doing is better rather than cloning the real Cremona.
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Old 3rd February 2014, 06:32 AM   #8
raelman is offline raelman  Spain
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It sounds to me very good your thoughts _henry_
Does anybody here have eve listened to original cremona's and/or monitor audio GR 60?
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Old 3rd February 2014, 09:21 AM   #9
_henry_ is offline _henry_  Australia
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Quote:
Originally Posted by raelman View Post
It sounds to me very good your thoughts _henry_
Does anybody here have eve listened to original cremona's and/or monitor audio GR 60?
what i meant was, if you dont have the original schematic of the crossover and access to the exact drivers they use then u need to buy the equivalent drivers from scanspeak then design the proper crossover for them.

Keeping the baffle width and height similar to your old monitor audio would probably give similar response and transfer function between the drivers, so in short putting the monitor audio drivers and crossover in your new beautiful cabinet prob a better decision rather than designing the whole new speakers.

cheers
henry
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Old 3rd February 2014, 01:42 PM   #10
raelman is offline raelman  Spain
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yes, I understood you.

but i'd like to know if anybody her has listened to cremonas and Monitor audio to share his thoughts...
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