NS7II - Phono preamp input hiss/noise

NS7II is the best in the world ! But...

Yesterday I tried to connect my 1210 turntable to phono inuput on the rear side. And was badly surprised how hiss/noise was high! Completely useless to work.

Even without a computer, hiss is there. Cables are ok, gnd connected, line inputs work fine, but at the moment i switch the knob above upfader from PC to LINE and from LINE to PHONO on the rear side, hiss appears. Even my MIC has lower noise!

Do you have some explanation?
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  • Hello,

    Thanks for posting. I'd like to help. Keep in mind, only channels 1 or 2 can be selected to Phono. On rear of the NS7II, connect your 1210 turntable to channel 1 or 2 and make sure the switch is set to PHONO. On top of your NS7II, switch either channel 1 or 2 to LINE.

    Mic 2 or Line (a device connected to the Mic 2 Input or Line Input on NS7II's rear panel). Please note that the Line/Phono selector switches on NS7II's rear panel must also be set properly. Also, a channel's controls will only send MIDI information when its Input Selector is set to PC.

    Important: Do not set more than one channel's Input Selectors to Mic2; doing so can cause unwanted feedback or distortion.

    Make sure you're using your Grounding Terminal. If using phono-level turntables with a grounding wire, connect the grounding wire to these terminals. If you experience a low "hum" or "buzz", this could mean that your turntables are not grounded.
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  • Hello Chris,

    Thanks a lot for your effort, appreciated much. But I did exactly as you described. Moreover, even when I don't connect anything on the rear panel and only switch to phono on the rear side and to Line on the top on channel 2 I hear high hiss!
    Just like the audio tape, maybe even louder. Even without Serato engaged. Whatever I do, the hiss is there.

    Is this the way NS7II works, I mean, is this as expected? I hope not...
    If you want, I can send photos of my setup or record a video... Whatever...

    I can believe that this could be "normal"... Thanks a lot!
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  • Hello everyone,

    Thanks again for posting! Let's clear everything up for everyone here. I can definitely see why hearing noise on any input would be alarming or confusing, but I can assure you that there’s nothing wrong with your NS7II. The signal that is being used on the phono circuitry, outputs at a higher level than the line circuity. The noise floor level is always going to be louder on a phono input than a line.

    Basically, comparing the noise levels of any inputs without sources playing is irrelevant. As with any audio system, you need to have an input signal to establish the reference level. Naturally, because a phono preamp has far more gain than a line level input, the noise floor will be much higher when the gain is cranked, which you would never do normally.

    Just to be sure, I tested a number of phono output turntables here with a few records into the NS7II. None of them required I turn the gain up beyond about 10 o’clock. The noise floor was undoubtedly not noticeable at this point.

    I didn't notice you playing a record from your 1210 on the video, but if you find you have to turn up the gain all the way with records from the 1210, here are some possibilities.

    * The cartridge output is lower than it’s normal level, perhaps due to age.
    * The RCA cables from the 1210 to the NS7II are too long; unbalanced RCA cables quickly lose signal strength the longer the cable is (keep it under 5ft when possible).
    * Although a much smaller factor in comparison, the needle’s tracking force can also affect volume output and signal to noise ratio.

    Lastly, on page 6 of your NS7II User Guide (not the Quick Start Guide) marked in yellow, it states "Important: Do not set more than one channel's Input Selectors to Mic2; doing so can cause unwanted feedback or distortion." I know your not doing this but keep this in mind in case if you decide to use your Mic2.



    I hope all this clears things up for everyone!
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