Could be!.... but I couldn't hear it.
Could be!.... but I couldn't hear it.
Shian7
--------------------------------------------------------
Kudakutemo
kudakutemo
ari mizu-no tsuki
Though it be be broken -
broken again - still it's there:
the moon on the water.
- Choshu.
Location: Lancaster(-ish), UK
Posts: 16,937
I'm ChrisB.
I've just stumbled on this thread but it interests me because of the experience I had with my headphone amp - a HFN/RR Headcase.
I once noticed that the hi-fi sounded a little quieter than usual & rather shut-in. I couldn't pin down the cause, pulled the whole system to pieces, tried replacing different components, checking phase - all sorts of stuff that couldn't possibly cause this.
Finally, I twigged that it was the volume pot on my headphone amp that was causing it. If it was left at anything other than zero setting, it had this effect - whether it was plugged into the mains or not. It was connected to the preamp via the tape out sockets.
Crap quality volume pot - changed it for a Sfernice & unplugged the Headcase from the system when it was out of use.
Moral - beware little used components with volume pots.
I only have three inputs into my (Pass Labs) preamp - phono XLR, CD XLR and digital. All digital inputs are switched before the DAC. I can't detect any difference by unplugging other inputs and I'm pretty sure my preamp switches signal + earth, so total disconnection anyway.
Location: Yorks
Posts: 16,643
I'm Nobody.
All you need is an handfull of RCA phono plugs , wire the signal to ground in the plug, plug em in the spare source input sockets...Don't do this for outputs tho...Remove any tape recorders from the Pre when not in use aswell.
Yes I have and sometimes it does improve things. Even better is to use shorting plugs on the inputs not used and properly screened/shielded interconnects on the inputs you do use.
Some input selector switches also allow breakthrough across their connections and this of course muddies the noise floor..
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me
Some preamplifiers disable unused inputs (other than the selected), no ?
Dimitri.
In a time of deceit telling the truth is a revolutionary act.
George Orwell
Location: Yorks
Posts: 16,643
I'm Nobody.
So people think
I've built a few preamps in my time and I always switch the return as well as the signal.
Many manufacturers bring everything back to a common or star point, signal return, psu ground, etc. I've never favoured this practice. I keep the signal and return together and completely seperate from any power supply grounding.
Ralph.