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Old 17th March 2019, 05:28 PM   #11
jdrouin is offline jdrouin  United States
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Et voilą.
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Old 17th March 2019, 05:45 PM   #12
vinylkid58 is offline vinylkid58  Canada
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CGR mFonken103Sol
Lookin' good.

jeff
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Old 17th March 2019, 06:54 PM   #13
planet10 is offline planet10  Canada
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CGR mFonken103Sol
:^)

Pictures pinched.

Sound?

dave
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Old 19th March 2019, 12:02 AM   #14
jdrouin is offline jdrouin  United States
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First impressions are very good. These speakers have a lot of control and detail. However, since I've only had about an hour to listen to them, I spent most of it experimenting with room placement so that I can form a better impression.

The room is 7' 9.5" W x 18.5' L x 9.25' H, with the speakers along a short wall.

I'd appreciate any suggestions for placement.

I tried the golden ratio placement (why not, right?). Nice sound stage but a bit lacking in bass extension, probably owing to distance from the wall behind them (~42"). So I left them at that width (25.81" from side walls and 41.875" apart from each other) and shoved them back so that the driver face is 26" from the wall behind. Better bass but some notable room reflections in that location, so I'll keep tweaking.

I was used to the Shrikes, which have a markedly different signature, so I'll spend time getting used to the CGRs before passing judgment. The CGRs have a more forward sound and give really nice body to single instruments, especially piano and voice. I think the wider front baffle helps there.

Also, I'm using 24 awg solid copper conductors from a run of CAT5E cable and suspect that they might be a bit thin for this application. Luckily the CGRs are shallow enough that I should be able to swap in some 18 awg, which works very well in the Shrikes, without too much trouble should it come to that.
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Old 19th March 2019, 05:27 PM   #15
jdrouin is offline jdrouin  United States
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I got the CGRs into a better place in the room (back of speaker 19" from back wall, sides 20" from side walls) and did some more listening last night and this morning. The CGRs just sound "right." Initially I thought they were lacking in bass extension and dynamics as compared to the Shrikes. But after A-Bing them this morning, the only advantage offered by the Shrikes (and I *love* the Shrikes) is a slight amount of further bass extension, but it's a little boomy. What the CGRs offer instead is much more accurate bass, at least as much if not more dynamics, finer accuracy/detail/control overall, and a wonderful presentation of acoustic instrument body/internal resonance. Last night I was captivated by Chopin and Schubert lieder because the piano's internal resonance was entrancing, and the voice even more so.

I'm excited to get back to work on the mFonken103SolTs today, if for no other reason than I'm so pleased with the CGRs. Seriously, you can't go wrong with these and it's a straightforward build because of the right angles.

Also, I don't know what an under- or over-damped cabinet would sound like, but my ears tell me that the wool batting I used works just fine and will employ it in the mFonken103SolT's without hesitation.

Last edited by jdrouin; 19th March 2019 at 05:30 PM.
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Old 19th March 2019, 07:36 PM   #16
planet10 is offline planet10  Canada
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CGR mFonken103Sol
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The CGRs just sound "right."
:^)
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Old 19th March 2019, 08:44 PM   #17
opa1 is offline opa1  United States
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Nice work! Look great.
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Old 19th March 2019, 10:59 PM   #18
jdrouin is offline jdrouin  United States
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Thanks!
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Old 20th March 2019, 04:08 PM   #19
jdrouin is offline jdrouin  United States
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Join Date: Feb 2012
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For some reason, the pics I posted above look excessively yellow. In real life they look like a more natural birch. Here are some pics in situ. First few show the golden ratio placement, last few show the current location, where they sound better (and soothe the savage beast).


Also pictured is the breadboarded 7C5 amp I've been designing.
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Last edited by jdrouin; 20th March 2019 at 04:10 PM.
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