Help with hissing sound

audio777
audio777 Posts: 9
edited March 2010 in Vintage Speakers
I just got my RTA 12b hooked up. Sounds great but there is a hissing sound when there is no music playing. Is there a way to get rid of the noise. Is it because of the amp i am using. I am using a crown com tech 400. any help will be welcomed :confused::confused:
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  • F1nut
    F1nut Posts: 51,700
    edited March 2010
    Seems as though your pro amp has a high noise floor, which they are known to have. As Sal hinted, a home amp is the answer.
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  • joeparaski
    joeparaski Posts: 1,865
    edited March 2010
    It isn't the amp, it's that snake that's curled up inside the speaker.

    Joe
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  • jz0h4d
    jz0h4d Posts: 33
    edited March 2010
    Garbage in Garbage out, it's the source not the Crown.
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  • F1nut
    F1nut Posts: 51,700
    edited March 2010
    jz0h4d wrote: »
    Garbage in Garbage out, it's the source not the Crown.

    Wanna try again?
    Sounds great but there is a hissing sound when there is no music playing.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • hearingimpared
    hearingimpared Posts: 21,136
    edited March 2010
    Are you using a turntable? I get hiss because I use a very low output MC cartridge and the necessary higher gain db level setting causes hiss when there is no music playing. I do agree that the Crown probably has a high noise floor because it is not meant to be used as home audiophile gear.
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  • audio777
    audio777 Posts: 9
    edited March 2010
    I don't have another amp to test it on or a scope to see how clean the signal going in the amp is. I was able to get rid of most of the noise by removing the third pins on the power cords of the amp and the cable box to make them the same as the tv. I have to put my ear to the speakers to hear noise. I tried connecting my pc to the tv but the pc made hissing worse. I can go without plugging the tv into the tv. I think its at the high frequencies because i can't hear it at the woofer.

    is a bit annoying because i know is there even though i can't hear it far away. Couldn't I get rid of the remaining noise by placing caps a cross the output of the amp. From what I know i believe i can use a cap as a filter right?
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  • JPSmario
    JPSmario Posts: 142
    edited March 2010
    You might want to look at a power conditioner that isolates your different components from each other at the power source. This really quieted down the noise in my system, expecially the turntable.
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  • hearingimpared
    hearingimpared Posts: 21,136
    edited March 2010
    JPSmario wrote: »
    You might want to look at a power conditioner that isolates your different components from each other at the power source. This really quieted down the noise in my system, expecially the turntable.

    Interesting! How does that come about?:) Like I said my hiss is from the high gain needed to bump of the db level due to the very low output of my cartridge.:confused:
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  • F1nut
    F1nut Posts: 51,700
    edited March 2010
    I have to put my ear to the speakers to hear noise.

    That's not unusual, so relax and enjoy the music.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • OldmanSRS
    OldmanSRS Posts: 419
    edited March 2010
    Amplification noise at -105 dB will produce a slight hiss audible with your ear at the tweeter. -125 is almost quiet.
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  • jz0h4d
    jz0h4d Posts: 33
    edited March 2010
    It is simple to determine which component is the culprit.
    1) Turn the volume off on the amp if the noise is still there the amp is the problem.
    2) Turn the vol. back up on the Crown, unplug the source from the preamp, if the noise is there it is the preamp.
    3) Still no noise? plug the source back in, noise?
    4) I am willing to concede that static could be an interconnect problem but it is not very likely.
    5) The Crown's 105db signal to noise ratio is better than some of the Adcom amps.
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  • Elinvader
    Elinvader Posts: 45
    edited March 2010
    +1 jz on all of the above...I run crown amps with a conditioner and a maximizer and never had problems, but then again it could be a cable....You could check pssl.com they do have a hiss/hum cancellation box..Never tried it though..Good luck
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  • audio777
    audio777 Posts: 9
    edited March 2010
    I figured out what the problem was. It was the source (tv) . I plan on buying a amplifier/receiver so i can hookup all my audio to it without having to put it through the tv. What is a good amplifier/receiver i can get to driver the rta 12bs for cheap? under 200 bucks
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  • hearingimpared
    hearingimpared Posts: 21,136
    edited March 2010
    audio777 wrote: »
    I figured out what the problem was. It was the source (tv) . I plan on buying a amplifier/receiver so i can hookup all my audio to it without having to put it through the tv. What is a good amplifier/receiver i can get to driver the rta 12bs for cheap? under 200 bucks

    A couple of NAD 2200 PEs. I think anonymouse might have one or two laying around.
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  • F1nut
    F1nut Posts: 51,700
    edited March 2010
    I plan on buying a amplifier/receiver so i can hookup all my audio to it without having to put it through the tv.

    Through your TV???
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

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  • audio777
    audio777 Posts: 9
    edited March 2010
    F1nut wrote: »
    Through your TV???


    things I have going through tv. xbox360 used for games and music, cable box, dvd player and pc and from tv to amp

    the amp i am using right now only has a single right and left inpints. If I can get a amp if multiple inputs i can take the audio from the 360, cable box, pc and dvd player straight to the amp and the video to the tv. basically taking the tv out of the audio connections
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  • F1nut
    F1nut Posts: 51,700
    edited March 2010
    So, how do you control the volume?

    You cannot connect all those sources to an amp. You must either connect them to an AVR or pre amp.

    What I recommend is sell to the Crown, buy a really nice AVR and be happy. As it is right now is just wrong.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • StantonZ
    StantonZ Posts: 452
    edited March 2010
    And replace the grounding pins on those plugs you removed: that's a dangerous way to fly.
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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited March 2010
    Please don't tell me you're controlling the volume with your TV...lol



    As F1 said, you can't connect those sources directly to a power amp. You need a preamp or an AVR in between them. It sounds like you may be confused about what you actually need.

    Also, most power amps are only going to have one pair of inputs.
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  • audio777
    audio777 Posts: 9
    edited March 2010
    I control the volume in the most inefficient way possible. Use the volume control of the back of the amp. For the gnd, it wasn’t the ground, it was the neutral (earth gnd I think) that I got rid off. I do plan of selling the crown on craigslist. Hopefully I can get enough money for it
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  • F1nut
    F1nut Posts: 51,700
    edited March 2010
    Use the volume control of the back of the amp.

    That is not really a volume control.
    I do plan of selling the crown on craigslist.

    Good. Now, you can start looking for an AVR. You'll have to ask the other guys here for recommendations as I don't use one.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • JPSmario
    JPSmario Posts: 142
    edited March 2010
    hearingimpared wrote: »
    Interesting! How does that come about?:) Like I said my hiss is from the high gain needed to bump of the db level due to the very low output of my cartridge.:confused:

    I wasn't referring to your low output cartridge situation. Before I bought my power conditioner, I noticed one day that when my preamp was set to phono and I turned on the TV (record ended, tv show started), I heard a distinct increase in hiss from my tweeters. after installing my power conditioner (all components plugged into separate outlets groups), this bump in hiss disappeared. My soundstage has deeper "blackness" between instruments and voices and is more transparent. I just never realized how dirty power can be and how much one component can affect another on the same circuit.
    Dual 1229/Grado Gold/Rotel RCD1070/RC995/RB980BX/Pioneer 7100/Denon DRM710/Monster HTS3600MKII/PolkAudio SDA2B/TL's
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  • hearingimpared
    hearingimpared Posts: 21,136
    edited March 2010
    JPSmario wrote: »
    I wasn't referring to your low output cartridge situation. Before I bought my power conditioner, I noticed one day that when my preamp was set to phono and I turned on the TV (record ended, tv show started), I heard a distinct increase in hiss from my tweeters. after installing my power conditioner (all components plugged into separate outlets groups), this bump in hiss disappeared. My soundstage has deeper "blackness" between instruments and voices and is more transparent. I just never realized how dirty power can be and how much one component can affect another on the same circuit.

    Ah I see, thanks for the clarification. That makes all the sense in world especially with your turntable as that is very suseptable to picking up noise.
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