|Midrange and top
Midrange and top has been through quite a few changes. The final decision fell on the PHL 3451 Midrange and the Aurum Cantus G1 ribbon. Both high sensitivity systems with more than 100 dB/1Watt.
Click thumbnail for lager picture.
|PHL 3451 frequency plot. This is a CLIO file
converted to the NetCalc file which I use for calculation of the X-over. The
plot is a gated frequency sweep at approx. 1 meter distance. The sensitivity
is approximated as the microphone has not been calibrated.
The small peak at 350 Hz may be some cavity resonance on the back of the baffle.
|Midrange baffle has been covered with 3 layers of cork - totalling 12 mm. Cut out to fit the PHL midrange.|
|The cork covered baffle with cut-out for the Aurum Cantus ribbon.|
|The leather is glued on.|
|The leather is fastened on the back side of the bafle|
|A trial mount - everything fits nicely.|
|A view from the side. The top corner of the leather covering as well as the top plate not yet finished.|
|A closer look at the new
DIY ribbon. Still in it's prototype stage but working quite OK. I have tried
a few stepup-transformers but still remain to find the right compromise
between load and sensitivity. The first one gave 1,5 ohm and well over 100
dB/1W, but the new one I made recently is more than 10 ohms and approx 92
Another thinner 4u ribbon will be tried, The one I use now is 9 u.
|Go to next page - finished system|