Dear All
Thank you so much for a wonderful project. I have just finished my CNO
2.5 speakers and thought that I would send you some pictures and
thoughts.
Having built some HI Fi furniture recently I was drawn to your designs
by the use of birch plywood as that is something I use a fair bit After
deciding that I could not get a 3 way design under our shutters I
settled on the 2.5 and set about a slightly revised cabinet design. I
wanted to get the feeling that the cabinets were carved from a solid
block of birch ply so laminated up some boards and decided to go for a
45 degree mitre on the top. That gave some issues as, with the tweeter
so close to the joint, I decided to cut the rebate for the tweeter after
glueing up the cabinets. A risky strategy as if it went wrong I would
have to start again. We were lucky. I rebated the back layer of the
front panel into the side and used some purple heart for the angled trim
that I took around the bottom as well.
Everything else went smoothly. It makes sense to make a jig to rout the
internal baffles and I jointed it all using my Festool domino which is
good for indexing the corner joints. Finish is wiped on Epifanes
varnish thinned 50/50 and five top coats of their rubbed effect interior
varnish over 5 coats of gloss.
I am trying out some home made isolating feet, which I think look good.
They have isolating sticky pads on both sides and so far (i have only
finished them today) work well.
Acoustically (where I am not that experienced) I have found, even with
the compromised placement in the room, that the bass is well controlled,
better than the Dali floor standers they replaced and the stereo image
is much wider in the room. Needless to say they are chalk and cheese
from the speakers they replace and I am very happy with them.
I have just had the first play of the remastered Abbey Road LP and Mrs C
described the result as very smooth. But she is just as happy that
Spencer the frog can still sit on the speaker without banging his head
on the shutters!
Here are some pictures - you will see they sit nicely next to the
Wurlitzer...
The system is :
Systemdek II with rewired Rega 250 with Origin structural mod.
Nagoka MP110
Project valve pre amp
Cyrus 3 with PSX
Project SteamBox and DAC
with best regards
Trevor
26-10-2021
Hi Troels
I sent you a couple of build articles about my CNO-25’s and those
concluded with the sentiment that unless we got a bigger house I was
banned from building anything more.
Well, believe it or not, we have moved to Wales and to an 18th Century
Dairy farm. Hence we have a separate “music room” and a much better
setting for the CNO’s.
To work with the 25’s I have built a couple of subs along the lines of
your Hypex ones using the Seas drivers and passive radiators taking the
speaker level input from the Icon Audio amp. All sounds so much better
with the speakers pulled out from the back wall and given a bit more
separation. I find that helps with my hearing which is biased in some
frequencies to one side. I have reverted to spikes on the carpeted floor
as opposed to my silicone isolation feet for the main speakers that I
had on the hardwood floor. Next I have to try making a high pass filter
to sit between the passive pre amp and power amp.
I am so pleased with the results and when in a year or so’s time I have
my barn converted into a workshop I have promised my friend John a pair
of CNO-4’s. Which I cant wait to hear.
Thank you so much for all your efforts and designs and I am sure Mrs C
appreciates my re kindled interest in the hobby which seems to have
resulted in a depletion of the bank balance and:
Gyrodec turntable
Audiomods tonearm
Hana SL cartridge
Project valve phono pre amp
NVA passive pre
Icon Audio 60 amp
Project Streambox
Audiolab 6000CDT
ADI 2 DAC
and Mrs’s C’s good old Nakamichi Cassette Deck 2 (which still amazes)
all the best to you from the west of Wales
Trevor
Previous set-up and construction:
|