Messed about with the terassed ribbon but given its thickness it could not take a lot of handling. So I mounted an other one which I corrugated with a new apparatus. These are 15um. Best measures yet I think. Level was quite high at say 98dB 0,5m. Higher order is really low witch is nice. Sounds nice but I think there is something special in thinner foils.
For this ribbon I also made it possible to adjust one end while playing 2Khz and at the same time using REWs RTA distorsion analysis for the final tuning of tension and flatness.
For this ribbon I also made it possible to adjust one end while playing 2Khz and at the same time using REWs RTA distorsion analysis for the final tuning of tension and flatness.
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I happend to measure the connections to the driver without a ribbon... 18 ohm 8-o
Is that bad? Carbon is a conductor and I have not isolated the connection pads.
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Is that bad? Carbon is a conductor and I have not isolated the connection pads.
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Have I given up? No, just licking the wounds 🙂 Got some help to manufacture the parts for mk2.
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ai 0.3 percent distortion is till pretty high , if you ask me. but im not sure what mic you use. maybe it is the high spl you beat them with 🙂 i mean if the spl is a true value then ill take my words back for sure 🙂 BTW looks nicely flat !!! hope to see more when you are done with your DAC!
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With this jig gluing was a joy. The second magnet just slid into the jig with no big effort and everything felt in total control - quite the opposite from the previous experience. The remaining assembly after one have 2 magnets will also be a breeze compared to the first versions. Easy peasy. I believe that the symmetry will be superior as this method forces everything to be aligned - hopefully with reduced distorsion as the result.
One down, 3 to go - really looking forward to hearing these in stereo.
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One down, 3 to go - really looking forward to hearing these in stereo.
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Two makes a pair. Phjuu, they come out really well. Remains some removal of residual glue. I intend to use silicone to join the 4 parts in each driver in order to be able to separate them in the future if needed. As the N faces S it keeps together by itself but it surely needs glueing.
Now for a ribbon fastening and connection mechanism..
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Now for a ribbon fastening and connection mechanism..
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I now have 2 playing, each over a first order filter sat in at 5khz. There is a big peak but below and above it looks really good actually. There is I think something mechanical not ideal in my clamping system. Will look into this. promising of I can get rid of that peak and keep the rest 🙂 Mic distance was 30 cm. 2nd meas normalized and in %.
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I was able to get rid of the resonance by playing with the ribbon tension, you could try different tensions and see what the peak does.
Do you use contact fluid with the ribbon when you clamp it? I use VanDenHul 'The Solution', it's expensive but worth every penny. Because it's a bit viscous it allows me to position and tension the ribbon before putting on the clamps.
regards,
Gerrit
Ok maybe it is the actual tensioning and not the clamp system itself. I have been meaning to acquire the VDH solution.
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Gerrit, could you try to quantify how hard you tension your ribbons. Maybe relative to your corrugation, how much do you stretch a full "wave" in % would you say?
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