1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.

need some help setting up hi fi audio

Discussion in 'CB Radio Modifications' started by tootall170, Jan 3, 2017.

  1. 543_Dallas

    543_Dallas
    Expand Collapse
    Sr. Member

    Joined:
    Jul 25, 2011
    Messages:
    1,152
    Likes Received:
    1,098
    Turn the bass down around 100hz. Frequencies in that neighborhood will make you sound muddy and boomy.



    Be sure you aren't overmodulating or have any clipping on the audio gear. It will cause distortion that a lot of guys have confused as too much bass. They start screwing with the eq and never make any progress.

    Try to use the eq to reduce the undesirable frequencies. Don't boost anything in the beginning. Once you get a good sound listen closely and try boosting some frequencies to see if you can make any improvement.

    Invest in a dummy load if you don't have one. Ive spent hours talking to myself and no one else had to hear me.
     
    LeapFrog likes this.

  2. jon666

    jon666
    Expand Collapse
    Well-Known Member

    Joined:
    Jan 24, 2006
    Messages:
    900
    Likes Received:
    207
    i took care of the problem. he wont be hearing anything. until he finds the tiny transmitter i built. and hid in his culvert. all he will hear is metallica enter sandman..
     
    JoeDirt likes this.
  3. jon666

    jon666
    Expand Collapse
    Well-Known Member

    Joined:
    Jan 24, 2006
    Messages:
    900
    Likes Received:
    207
    he only uses one channel 6
     
  4. StrangeBrew

    StrangeBrew
    Expand Collapse
    Well-Known Member

    Joined:
    Aug 15, 2011
    Messages:
    427
    Likes Received:
    287
    I wish more people would realize this.(y)
     
    LeapFrog likes this.
  5. 543_Dallas

    543_Dallas
    Expand Collapse
    Sr. Member

    Joined:
    Jul 25, 2011
    Messages:
    1,152
    Likes Received:
    1,098
    That sounds pretty elaborate. I hate to keep getting this thread off topic but if you want to start another thread with details I'd be interested.
     
    StrangeBrew, LeapFrog and JoeDirt like this.
  6. jon666

    jon666
    Expand Collapse
    Well-Known Member

    Joined:
    Jan 24, 2006
    Messages:
    900
    Likes Received:
    207
    its just a simple fm transmitter. easy to build. he is running around his house trying to find it.
    funny to watch. its only good for about 500 feet.
    i never give away my secrets. i had the build plans for years.
     
  7. BBB

    BBB
    Expand Collapse
    Well-Known Member

    Joined:
    Jan 17, 2012
    Messages:
    697
    Likes Received:
    336
    #52 BBB, Jan 12, 2017
    Last edited: Jan 12, 2017
    LeapFrog likes this.
  8. rabbiporkchop

    rabbiporkchop
    Expand Collapse
    Well-Known Member

    Joined:
    Jan 18, 2007
    Messages:
    1,079
    Likes Received:
    252
  9. PA629

    PA629
    Expand Collapse
    Active Member

    Joined:
    Jan 22, 2007
    Messages:
    192
    Likes Received:
    66
    You're going to drive yourself nuts trying out all the very usable and highly affordable condenser mic elements available on the market. Just pick out a frequency range and response curve you like and go at it. Even Rat Shack had a desirable version for like 2 bucks.
     
    rabbiporkchop likes this.
  10. rabbiporkchop

    rabbiporkchop
    Expand Collapse
    Well-Known Member

    Joined:
    Jan 18, 2007
    Messages:
    1,079
    Likes Received:
    252
    It's not too often you run across the perfect housing with an opening on the front and rear..
    I just figured I'd share that in case somebody decided to take on a project.
     
  11. PA629

    PA629
    Expand Collapse
    Active Member

    Joined:
    Jan 22, 2007
    Messages:
    192
    Likes Received:
    66
    Without a doubt a perfect housing for a NC project, but w/o looking on EBay, how readily available is that old model Shure?
     
  12. fourstringburn

    fourstringburn
    Expand Collapse
    W9WDX Amateur Radio Club Member K5KNM

    Joined:
    Feb 11, 2007
    Messages:
    1,382
    Likes Received:
    753
    I would bet that mic would have better voice quality if the impedance was 600 ohms or less since most mic input impedances are around 600 ohms.

    When you use a high Z mic into a much lower impedance input its like forcing a 4 inch water line into a 1 inch line. The result will be too much resistance, not letting all the water pass. With mics this will mean many voice quality frequencies will be blocked from being passed. In the pro audio world, this would give a dull and lifeless sound that I doubt any sound engineer would accept unless purposely going for an effect.

    Impedances don't have too be matched, but they shouldn't be substantially higher than the input. Many pro mics are around 300 ohms and will pass excellent voice quality audio just like running a 1 inch water line into a 4 inch line, no problem because the all the water will flow into it.

    RK 56 mics are high Z mics and while they do have thier own sound, I find it to be dark sounding where as the Astatic 636L is 200 ohms and sounds more open and clear to me.

    On CB radio, it is a personal preference.
     
    rabbiporkchop likes this.
  13. rabbiporkchop

    rabbiporkchop
    Expand Collapse
    Well-Known Member

    Joined:
    Jan 18, 2007
    Messages:
    1,079
    Likes Received:
    252
    they seem to be a dime a dozen on eBay
     
  14. rabbiporkchop

    rabbiporkchop
    Expand Collapse
    Well-Known Member

    Joined:
    Jan 18, 2007
    Messages:
    1,079
    Likes Received:
    252
    It's really easy to build an Attenuator pad to match the impedance as well as attenuate the signal to whatever amount you need.
    [​IMG]
     
    fourstringburn likes this.
  15. fourstringburn

    fourstringburn
    Expand Collapse
    W9WDX Amateur Radio Club Member K5KNM

    Joined:
    Feb 11, 2007
    Messages:
    1,382
    Likes Received:
    753
    That's what I would do. Build a simple project box with a mic in and out and use some impedance transforming resistors to get the impedance down.
     
    rabbiporkchop likes this.

Share This Page

Members Online Now

  1. Robb,
  2. Stargate,
  3. 187lonestar,
  4. midnight special,
  5. Tim Fletcher,
  6. autotuner
Total: 245 (members: 6, guests: 152, robots: 87)