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Multi-Way Conventional loudspeakers with crossovers

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Old 4th February 2014, 05:19 PM   #21
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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?
I have a pair of the original Cremonas. The crossover looks very simple. My guess is that it's second order between the woofer and mid, and first order between the tweeter and mid. All drivers are wired in phase. Here's a picture of the crossover.
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Old 4th February 2014, 08:46 PM   #22
raelman is online now raelman  Spain
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Thanks for sharing, audiomagnate.
Yes, they seems to be very simple, but, the drivers are tweaked by themselves...
I you, or any other, could do a drawing would be very helpfull

I will go on posting the enclosure building:
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Old 4th February 2014, 08:48 PM   #23
raelman is online now raelman  Spain
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As I am a newbie, I added a lot of glue and I had to clean a lot….
Later I was doing better, but don’t use such amount of glue…
I don’t want to think about the sanding…

Click the image to open in full size.

I started with 5 ribs assembly to test the glue dry time, but then I did 10 ribs pieces because my press tools were not capable for any longer pieces:

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Click the image to open in full size.
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Old 4th February 2014, 10:32 PM   #24
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EKTA GRANDE calls for a 65l enclosure, EKTA has a build inspired by the SF Amati, and comes in at 32l minus the mid enclosure. For my money I'd swap out for the cheaper tweeter as suggested on the grande.
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Old 5th February 2014, 08:24 AM   #25
raelman is online now raelman  Spain
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Yes, volume in EKTA is about 16 nett liters bigger than mine, but cremonas uses the same woofers and BassBox Pro 6 says that 45-46l volume is enough, and I have 46liters.

I have simulated BB pro 6 like prism box and truncated cylinder and both options give me very close results.
My design is 46l so I guess everything could be ok

Click the image to open in full size.
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Old 5th February 2014, 11:57 AM   #26
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OK, is that 46L after removing the space for the Mid etc?
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Old 5th February 2014, 12:04 PM   #27
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How did you cut the profile on the rear?
From your pictures and drawing it looks like this was done after assembly, to a very high standard as well!
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Old 5th February 2014, 01:40 PM   #28
raelman is online now raelman  Spain
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The 46l are net liters for bass
There are 4,7 litters for mid/tweeters apart from the 46 bass ones.
The mid/tw camera is sealed and independent from the bass one, and the bass space (even the mids) could be easily increased by adding more ribs (1,5l each one, what makes the enclosure taller) or adding some depth/width to the design.

The profile on the rear was hand cut with a saw, is not difficult if you take care and about 30-40 minutes each big one... The glued DM are very very solid..

You need to drawn the line with a pencil, then with a cutter to guide you and... Saw job.
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Old 5th February 2014, 02:42 PM   #29
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OKay, that sounds v brave - taking a saw to the back of the assembled speaker - been quoted £380 for the material and routing plus delivery.
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Old 5th February 2014, 02:59 PM   #30
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I have to say I'm amazed your thinking of selling your old speakers and switching to new drivers... when you have a set of drivers and crossover that you're effectively happy with sound wise, I'd be a little nervous about adopting a design I hadn't heard over something I had that I was happy with... just my two cents
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