The voltage gain into 8 ohms was to specifications: at 26.8dB using the balanced inputs, and slightly higher, 27.2dB, using the unbalanced inputs. If so less noise and better sound if you go direct with rca, as this cuts out that balanced opamp with it’s added noise. What "could" be is that the balanced input is a balanced summing opamp feeding the single ended discrete input circuit. Levinson 532H it’s +0.4db difference in favor of the RCA!!!. Enjoy ! and stay safe.everyone.Ĭleeds I’m pretty sure that your amp is a true balanced ("differential") amplifier, so you will get 6dB more gain using the balanced connections than you will from unbalanced. Lots of articles abound, about these subjects. As cleeds indicated, the term " gain ", and mc, with " signal to noise ratio ", is quite a lot, of what connecting this audio stuff, is all about. I am a little confused about your statement, relating to the Parasound, and the 5 amps, available from the wall, which is quite inadequate. Speakers that are more sensitive ( efficient, playing louder with the same power applied), will likely show a higher hiss level, just as an fyi. Always keep your room, a major part of the equation, as both size, and the acoustics, matter. Replacing your speakers will be entirely up to what you like, and being a musician, just read up on manufacturer product descriptions, product reviews, both from professionals and consumers, and listen to stuff, if at all possible ( which can be difficult during the virus ). A recent thread on " Tech Talk " here, about transformer hum, might be a good read for you. Putting your ear close to the power amplifier, it is quite common to hear the transformer. As you stated, the hiss is not audible from your listening chair, so I would not worry about it. Appreciate any ideas on why the hiss increases when the switches are set to balanced inputs and how it could possibly be eliminated. Two other things: there is a very slight hum coming from the amp (again, only audible if I'm very close to the amp) and the A/C power from my outlets seems pretty inadequate (probably less than 5 amps according to the Parasound). Also, the addition of a power conditioner has made no difference at all. I should note that the hiss is evident whether or not anything is actually connected to the amp (other than the speakers, obviously), and there's no difference with gain when I have the 390s connected. In balanced mode, the hiss is only audible when my ear is 3 or 4 inches from the tweeters so it doesn't in any way detract from my overall musical experience. Both speakers have an equal amount of hiss. When unbalanced are selected, the hiss is substantially reduced, nearly but not quite silent. The switches had always been set for the RCA single ended inputs, so I just noticed that when the switches are set to balanced, there is a very slight hiss coming from my tweeters. The 532H has switches on the back for selecting balanced or unbalanced interconnects. Recently, I switched from single-ended to balanced interconnects (Cardas Neutral Reference) because it's a pretty long run (~12 feet) between the components. I have hesitated returning them since if they decide there is nothing wrong i will have to pay to have them sent back so i figure with my luck my money is better spent on buying a pair of clean monitors which I am presently shopping around for.I have a Mark Levinson 532H amp that is connected to a Levinson 390S CD processor only (no preamp). As a tip, i've found draping a thick towel over the front cuts the hiss down by about 60% making them almost bearable for practice use at home, however don't cover the back since thats where the passive heat exchanger is ! This ev hiss issue is also discussed in another forum, just google on "Electro-Voice ZXA1 - the Verve 8ma killer" to find the link. ![]() I wouldn't want to aim these at a audience either in a small room either since any quiet moment between songs would be overwhelmed by the hiss, so really the only practical use for these for me is stage monitors. Whether or not i am 1ft or 10ft in front the hiss sound is just as loud, which I attribute to the awesome power of these speakers and otherwise amazing sound quality and projection for their size. I have tried them at three different buildings and its all the same so nothing to do with the building power not to mention i run them through a pair of furman power factors. The hiss is at a fixed level independent of the master gain knob at the back. ![]() Same symptom as you describe, regardless of anything being plugged in the hiss is always there. Jazzjohn I have pair that i bought brand new a couple of years ago when they first came out, and they hiss like a couple of snakes.
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