vortecjr Posted March 21, 2020 Share Posted March 21, 2020 Anyone care to guess why this channel imbalance is taking place in this measurement? The answer may surprise you. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | endPoint | opticalModule DX | Power Supplies | Link to comment
Matias Posted March 21, 2020 Share Posted March 21, 2020 One channel closer to the power supply would be my guess. Speedskater 1 1. WiiM Pro - Mola Mola Makua - Apollon NCx500+SS2590 - March Audio Sointuva AWG 2. LG 77C1 - Marantz SR7005 - Apollon NC502MP+NC252MP - Monitor Audio PL100+PLC150+C265 - SVS SB-3000 3. PC - RME ADI-2 DAC FS - Neumann KH 80 DSP 4. Phone - Tanchjim Space - Truthear Zero Red 5. PC - Keysion ES2981 - Truthear Zero Red Link to comment
Speedskater Posted March 21, 2020 Share Posted March 21, 2020 Wrong test for checking channel imbalance? Link to comment
vortecjr Posted March 21, 2020 Author Share Posted March 21, 2020 You guys are 🥶 SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | endPoint | opticalModule DX | Power Supplies | Link to comment
jabbr Posted March 21, 2020 Share Posted March 21, 2020 Is the peak higher on the red line? If not there is more noise on that line for some reason. Could be a variety of things. Custom room treatments for headphone users. Link to comment
Matias Posted March 21, 2020 Share Posted March 21, 2020 Different FFT samples? 1. WiiM Pro - Mola Mola Makua - Apollon NCx500+SS2590 - March Audio Sointuva AWG 2. LG 77C1 - Marantz SR7005 - Apollon NC502MP+NC252MP - Monitor Audio PL100+PLC150+C265 - SVS SB-3000 3. PC - RME ADI-2 DAC FS - Neumann KH 80 DSP 4. Phone - Tanchjim Space - Truthear Zero Red 5. PC - Keysion ES2981 - Truthear Zero Red Link to comment
vortecjr Posted March 21, 2020 Author Share Posted March 21, 2020 2 hours ago, jabbr said: Is the peak higher on the red line? If not there is more noise on that line for some reason. Could be a variety of things. I think the peak was the same, but I’m not certain. It’s only attributed to one simple issue. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | endPoint | opticalModule DX | Power Supplies | Link to comment
vortecjr Posted March 21, 2020 Author Share Posted March 21, 2020 30 minutes ago, Matias said: Different FFT samples? This is one FFT taken at the same time from one device’s left and right channels via the unbalanced RCA output. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | endPoint | opticalModule DX | Power Supplies | Link to comment
jabbr Posted March 21, 2020 Share Posted March 21, 2020 24 minutes ago, vortecjr said: I think the peak was the same, but I’m not certain. It’s only attributed to one simple issue. If the peak is the same between the 1k tone into both channels, then the difference is the baseline which is noise. Custom room treatments for headphone users. Link to comment
vortecjr Posted March 21, 2020 Author Share Posted March 21, 2020 4 minutes ago, jabbr said: If the peak is the same between the 1k tone into both channels, then the difference is the baseline which is noise. Run with that...what is causing the noise? SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | endPoint | opticalModule DX | Power Supplies | Link to comment
Matias Posted March 21, 2020 Share Posted March 21, 2020 Different grounds? Or impedance to ground? 1. WiiM Pro - Mola Mola Makua - Apollon NCx500+SS2590 - March Audio Sointuva AWG 2. LG 77C1 - Marantz SR7005 - Apollon NC502MP+NC252MP - Monitor Audio PL100+PLC150+C265 - SVS SB-3000 3. PC - RME ADI-2 DAC FS - Neumann KH 80 DSP 4. Phone - Tanchjim Space - Truthear Zero Red 5. PC - Keysion ES2981 - Truthear Zero Red Link to comment
vortecjr Posted March 21, 2020 Author Share Posted March 21, 2020 Here is what is going on. I wiggled the cable and it went away so I thought maybe a bad RCA connector. After further inspection the connector seemed okay. The issue was that the connector was not in all the way even though it seemed snug. It just needed to be punched in a bit more to make complete contact. motberg 1 SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | endPoint | opticalModule DX | Power Supplies | Link to comment
Matias Posted March 21, 2020 Share Posted March 21, 2020 Never would have guessed. Interesting. 1. WiiM Pro - Mola Mola Makua - Apollon NCx500+SS2590 - March Audio Sointuva AWG 2. LG 77C1 - Marantz SR7005 - Apollon NC502MP+NC252MP - Monitor Audio PL100+PLC150+C265 - SVS SB-3000 3. PC - RME ADI-2 DAC FS - Neumann KH 80 DSP 4. Phone - Tanchjim Space - Truthear Zero Red 5. PC - Keysion ES2981 - Truthear Zero Red Link to comment
bluesman Posted April 2, 2020 Share Posted April 2, 2020 On 3/21/2020 at 6:41 PM, vortecjr said: Here is what is going on. I wiggled the cable and it went away so I thought maybe a bad RCA connector. After further inspection the connector seemed okay. The issue was that the connector was not in all the way even though it seemed snug. It just needed to be punched in a bit more to make complete contact. There may well be oxidation on one or both of the connectors at that joint. This can develop in the tiniest of gaps if the male isn't fully & firmly seated in the female or if contact is weak for another reason (e.g. the ID of the outer apron on the male isn't a close fit to the OD of the female). Depending on the materials from which the connectors are made, the oxides that form can turn the joint into a capacitor, a resistor, or (probably) both. You might want to clean all of the connectors well and plug them back in firmly. Just twisting an RCA male in its female can improve contact and temporarily solve audio problems. But the oxidation is still there and will cause further problems if not removed. Many (most?) consumer grade RCA connectors are flimsy parts. Bits can separate from each other and are easily bent. In the old days, it wasn't uncommon to find a single strand of wire protruding from either the tip or around the outside of the apron of the male. Audiophile grade RCAs are much better today - but I avoid them whenever I can and use the best I can find if I'm stuck with them. sandyk 1 Link to comment
zacster Posted April 22, 2020 Share Posted April 22, 2020 Deoxit. Whenever I have an issue with tube noise I now just spray 'em all with Deoxit and insert and wiggle the tubes in the socket. All the noise goes away. It seems to be especially bad on Russian nine pin tubes. It is the same with RCAs. Anything that is held in place by friction will need this treatment eventually. Link to comment
Mike48 Posted April 26, 2020 Share Posted April 26, 2020 This illustrates again how horrible the RCA connector is. Something probably designed to be cheap and just good enough has established itself as a standard. Speedskater 1 Link to comment
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now