2. amps-preamps
  3. 128510-2280

Why Single-Ended?

I’ve long wondered why some manufacturers design their components to be SE only. I work in the industry and know that "balanced" audio lines have been the pro standard (for grounding and noise reduction reasons) and home stereo units started out as single-ended designs.

One reason components are not balanced is due to cost, and it’s good to be able to get high quality sound at an affordable price.
But, with so many balanced HiFi components available these days, why have some companies not offered a fully-balanced amp or preamp in their product line?
I’m referring to fine companies such as Conrad Johnson, Consonance, Coincident, and Bob Carver’s tube amps. CJ builds amps that sell for $20-$39K, so their design is not driven by cost.

The reason I’m asking is because in a system you might have a couple of balanced sources, balanced preamp, and then the final stage might be a tube amp or monoblocks which have SE input. How much of the total signal is lost in this type of setup? IOW, are we missing out on sonic bliss by mixing balanced and unbalanced?

128x128lowrider57
atmasphere's avatar
atmasphere
11,615 posts
 
^^Just FWIW, star grounding is nice but the real issue is how the chassis and circuit grounds are handled!
wolf_garcia
6,628 posts
 
I have a balanced preamp and XLR inputs into my power amp, but the amp inputs are likely not balanced at all (Jolida 502p). Thus when I hooked up a pair of balanced Mogamis to replace whatever the unmarked weird green XLRs (that sound fine by the way) are that came with my preamp, the Mogamis sounded awful…weirdly since I’ve used Mogami balanced cables in pro audio for years. I can now assume the Mogamis just didn’t mesh with the "unbalancing" of the amp inputs, so back they went to Guitar Center (I tried). I use Mogami Neglex for my turntable "din to RCA" and they’re much quieter than the stock Linn cable they replaced, so Mogami is still OK by me. I use an AQ balanced cable to the amp now, and it works fine. Note that when I was recording songs by "folkie" artists for a cable TV interview show we had in Maine years ago, I did notice that high quality XLR mic cables all around sounded somewhat better in my headphones than el cheapo cables…so there’s that.
bwaslo
51 posts
 
Why doesn't Magico build horn speakers?  They are.... wait... oh, they do.
lowrider57's avatar
lowrider57 OP
5,396 posts
 
i have a balanced preamp and XLR inputs into my power amp, but the amp inputs are likely not balanced at all (Jolida 502p). Thus when I hooked up a pair of balanced Mogamis to replace whatever the unmarked weird green XLRs (that sound fine by the way) are that came with my preamp, the Mogamis sounded awful…

If the Mogami's are truly balanced and the Jolida shorts pins 1 and 3 of the XLR inputs, could this cause a change in sonics?

atmasphere's avatar
atmasphere
11,615 posts
 
Yes! It brings the shield into play as part of the signal. IOW its not just for shielding any more. As soon as that happens, then the cable imposes considerably more artifact.
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