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Thread: 7 1/2 / 15 / 30 ips ?

  1. #1
    Audio Al is offline Pishanto Specialist & Super-Daftee
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    I'm Allen.

    Default 7 1/2 / 15 / 30 ips ?

    Silly question time

    Why do people say that recording at 30 IPS is better than 7 1/2 or 15 IPS ?

    Opinions please
    [

  2. #2
    Join Date: Nov 2016

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    I'm Chris.

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    Very basic but it does explain the reason for faster tape speeds sounding better.
    https://www.schoolphysics.co.uk/age1...ing/index.html
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    Revox A77 MK IV 2 track 15 & 7 1/2 IPS
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  3. #3
    Audio Al is offline Pishanto Specialist & Super-Daftee
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    OK so it's this

    The faster the tape moves the better the recording because the information (lets say the music) is spread out over a longer piece of tape. Slow tape speed compresses the information into a small length and a poorer recording results. The recording head should be as close to the tape as possible so that the changing magnetic field can affect the iron oxide grains more easily.

    Thanks
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  4. #4
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    Quote Originally Posted by Audio Al View Post
    OK so it's this

    The faster the tape moves the better the recording because the information (lets say the music) is spread out over a longer piece of tape. Slow tape speed compresses the information into a small length and a poorer recording results.

    Thanks
    That's it
    Turntable : Project 2 Xperience Tone Arm & Cartridge : Project 9c Ortofon 2M Blue Phono Stage : Project Phono Box SE II Digital Source :Primare CD21 Integrated Amp : Primare I30 Speakers : ProAc 110 Headphones : Beyerdynamic DT770 Pro

    Revox A77 MK IV 2 track 15 & 7 1/2 IPS
    TEAC A-3300SX 4 track 7 1/2 & 3 3/4 IPS
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  5. #5
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    The shortest wavelength that can be recorded onto the tape is determined by the width of the head gap. Thus the highest recordable frequency is thus given by (recording speed)/(gap width), so the higher the recording speed the higher the frequency that can be recorded.

    It's not quite as simple as that, but you get the idea.
    Barry

  6. #6
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    Same reason 45rpm will sound better than 33 given a level playing field.
    “Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”

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  7. #7
    Audio Al is offline Pishanto Specialist & Super-Daftee
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    Quote Originally Posted by Ali Tait View Post
    Same reason 45rpm will sound better than 33 given a level playing field.
    So where does half speed masters come in then
    [

  8. #8
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    Quote Originally Posted by Audio Al View Post
    So where does half speed masters come in then
    The cutting stylus doesn't get as hot cutting the high frequencies because the high frequencies are halved.
    The higher the frequency, the hotter the cutter stylus gets, and if there's too much high frequency information at too high an amplitude the cutting stylus will literally burn out.
    Chris



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  9. #9
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    I remember my VCR having a "long play" facility, where it could record and play back at half speed, so doubling the available length of programmes you could record. Picture quality wasn't as good though.
    I just dropped in, to see what condition my condition was in

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  10. #10
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    Allen,

    The multitrack 1970s/1980s session masters were usually on 2 inch tape at 30 IPS with 16 or 24 tracks. The original stereo mix down master was usually a 30 IPS 1/2 inch tape. Production or distribution tapes were copied form the 1/2 inch 2 track stereo master and sent out to record pressing plants. Most production masters were sent out on 1/4 inch tape as 15 IPS 2 track.

    Charlie
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