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Great, let us know the results when you do this test.
Both 6dB attenuators at the Hiface end sounded better than one at each end of the cable?
Your 16foot SPDIF cable is ala Jocko's recommendation of long SPDIF cables?
The 10 dB and 6 dB attenuators, both connected to the HiFace side of the cable, and the 6 dB attenuator connected to the DAC side of the cable, sounds better, listening to Santana's Samba Pa Ti, than the 10 and 6 dB attenuators. Guitar notes are more distinct. Background is quieter. I am becoming an attenuation junkie. Anyone know where I can score a 15 dB bag?
My distinctly amateurish efforts didn't bear much fruit. I used a powered USB hub from Rosewill and an RCA to RCA adapter to connect the HiFace directly into my Havana DAC and the results were pretty bad. The highs were quite sharp and there was absolutely no soundstage at all. On switching back to my GH spdif coaxial cable and the HiFace plugged into my netbook, everything improved immensely with great separation and soundstaging and the edge on the highs disappeared. At least I can use the hub on my other PC so all was not lost.... .
Minicircuits have 3,6,10,15,20dB attenuators - where did you get the ones you have?You can use too much attenuation & SPDIF lock will fail but just before that the sound will probably be worse dropping out randomly. This is also dependent on the DAC are you running into?
I received the attenuators from minicircuits. I might order a few more. I haven't had any dropouts with the 22 dB combination. I am using an AVA Vision DAC.
With 22dB, you are now mainlining ( ) did it sound any better/worse? I don't think you will get any more out of it - that is a significant attenuation. What these attenuators do is give you the equivalent of a very good i.e. expensive cable (in fact I would say it betters a very good cable) for a pittance!!
I believe what you are hearing in that HF sharpness & soundstage collapse is the sound of increased reflections (jitter) from impedance mismatches - maybe your RCA to RCA connector is introducing this. I've seen scope shots of a Hiface plugged directly into a scope & badly terminated - it showed horrible reflections. Try the attenuators for an even more improvement in sound!
It's possible although I purchased a supposedly 75 ohm RCA-RCA adaptor off the web. I know they are not true 75 ohm connections but I figured it might be a better quality. What I got looked like a pretty bog-standard one, no gold finish, nothing. How would I determine if it is an impedance mismatch? Also how to I attach the attenuators? I thought they were only BNC-ended. I'm also not sure if I hooked everything up correctly. I had originally trouble finding a decent A to A USB cable and the instructions said to connect the hub to the netbook using the small USB A to mini-B supplied cable. After that I then connected the HiFace directly to the hub and the Havana via the RCA-RCA adaptor. Did I do something wrong here?
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