Erikgunnar
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- Jan 11, 2021
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I am not qualified the answer that but many on this forum are for sure. I like to know myself.Interesting, thanks! So does this setup make their pin 1 grounding not a problem?
I am not qualified the answer that but many on this forum are for sure. I like to know myself.Interesting, thanks! So does this setup make their pin 1 grounding not a problem?
Pros:Guys, are there any benefits if I would buy audiophonics Purifi mono blocks instead of €150 cheaper audiophonics Purifi stereo ?
Please let me know what do you think as I am very close to buy the amp, just deciding which one to buy. Thanks
Guys, are there any benefits if I would buy audiophonics Purifi mono blocks instead of €150 cheaper audiophonics Purifi stereo ?
Please let me know what do you think as I am very close to buy the amp, just deciding which one to buy. Thanks
To be more clear, you're aware of the the various XLR models that have an internal connection between pin 1 and the chassis, and you know this isn't using one of them?To be clear. There is chassis gound on pin 1 but the chassis ground does not come from grounding at the connector but from chassis grounding through the buffer board.
Well noted. For the Audiophonic amp if I dissconect the input cable to the buffer board that comes from the XLR/RCA input board the pin 1 chassis ground dissapear. If I messure on the ground pin on the buffer board it connects to chassis. So no ground chassis connection of the XLR/RCA input board.To be more clear, you're aware of the the various XLR models that have an internal connection between pin 1 and the chassis, and you know this isn't using one of them?
EDIT: for those that aren't aware, some connectors have something like a metal spike next to the mounting screw that's intended to pierce the paint or anodizing to make a good connection to the chassis during normal assembly, but this is invisible when installed. The connection between pin 1 and this spike may be difficult or impossible to see too, depending on connector model.
The only thing that MIGHT make any difference Stereo vs Mono is that Mono uses a power supply per channel (Hypex 600) while the stereo amp share one larger power supply for both left and right channel (Hypex 1200). If that will matter I do not dare to tell with my experienceMatius lays out the pros and cons well. My view is that the bottom line is that the stereo amp is the way to go and the dual mono blocks are not necessary.
Well noted. For the Audiophonic amp if I dissconect the input cable to the buffer board that comes from the XLR/RCA input board the pin 1 chassis ground dissapear. If I messure on the ground pin on the buffer board it connects to chassis. So no ground chassis connection of the XLR/RCA input board.
Also: if only one channel breaks, no need to buy the whole stereo amp anew.Pros:
- Absolute channel separation, although crosstalk between channels is usually very low anyway (like -100dB as per the NC252MP measurements on Buckeye amp).
- Moving each mono amp closer to the speaker allows shorter speaker cables, a little better damping factor.
Cons:
- More expensive.
- Takes up more space.
- Needs a 2nd power cable and outlet.
Yes does it really matter? If pin 1 has chassis ground does it matter of the interconection is at the jack or at the board.Right. So - and I apologize for being dense here - the Audiophonics appears not to use that configuration, but based on the connectivity tests/measurements @Erikgunnar has reported above, does it seem like Audiophonics has avoided the Pin 1 issue by other means, or do their units have the Pin 1 problem?
Right. So - and I apologize for being dense here - the Audiophonics appears not to use that configuration, but based on the connectivity tests/measurements @Erikgunnar has reported above, does it seem like Audiophonics has avoided the Pin 1 issue by other means, or do their units have the Pin 1 problem?
The "pin 1 problem" is caused by connecting pin 1 to signal ground instead of the chassis. As long as pin 1 is not connected to signal ground, you are OK.
If you want a practical test to see if it's a problem see AN007 from Jensen Transformers. The whole thing is worth reading, but section 3.3 introduces 'The Hummer' to check whether your device has a pin 1 problem.Yes does it really matter? If pin 1 has chassis ground does it matter of the interconection is at the jack or at the board.
Yes, it is explained there.I have some questions, do you know how I can bypass the gain stage and if it is worth it ? Do I need to screw out some screws and change it inside the case ?
Can distortion increase running high Vrms though XLR cables and bypass extra the additional gain stage?
Well noted. Thanks!The cables of course don't make a difference, but the absence of the buffer stage might, depending on how load-sensitive your DAC is. The role of the buffer is not just gain/amplification, but also impedance matching.