Good Amp Feedback (Sustain)

Discussion in 'The Tone Zone' started by Gianni, Sep 20, 2014.

  1. Gianni

    Gianni Well-Known Member

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    Hello everyone.

    I really hope you can offer some insight into the following two questions.

    In a home-studio setting, using a JVM, 1 Watt, amp head, with your guitar facing the speakers and enough volume/overdrive, would you expect to be able to create feedback (sustain) of a single note more easily with:

    1. A 60-Watt OR a 140-Watt Cab?

    2. An open-back OR a closed-back Cab?

    Or does it not make much difference either way?

    Cheers,
    Gianni
     
  2. 12barjunkie

    12barjunkie Well-Known Member

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    Volume and gain are the key; speakers/cab configuration not as important.
     
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  3. charveldan

    charveldan Well-Known Member

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    [​IMG]


    U need 99 more watts ...
     
  4. Gianni

    Gianni Well-Known Member

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    CharvelDan,

    Well, I don’t have them. :D

    But I’m sure you already know that a 1-Watt valve amp through just one efficient speaker, let alone more, can get quite loud, too loud for home use when cranked up.

    Good for you if you’ve actually played in venues where you could turn up your master volume and hear what your amp really sounds like, ‘cause most people have only heard the preamp tubes of their 100-Watt amps working. Then again, if you’ve ever tried to crank up your 100-Watt amp at home, I sure hope you can still hear yourself playing your guitar.

    Although I did find your response amusing, after 3790 posts, and with all the impressive gear I see in your photos, I’m sure you can be much more helpful.
     
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  5. Gianni

    Gianni Well-Known Member

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    12BarJunkie,

    Thanks a lot for the quick response and input.

    I am very sorry for your recent loss.
    I’ve just posted a message in the relevant thread.
     
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  6. Gianni

    Gianni Well-Known Member

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    Just to explain the reason behind my post, I was just thinking that the speakers of a 60-Watt cab could be ‘moved’ more easily than those of a 140-Watt one by a 1-Watt amp, as well as that an open-back cab, having more mids, would also help with creating feedback. I’m quite new to all this and may well be wrong.
     
  7. The Ozzk

    The Ozzk Well-Known Member

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    Volume and a touch of reverb. :yesway:
     
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  8. Gianni

    Gianni Well-Known Member

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    The Ozzk,

    Thanks a lot for your input.
     
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  9. charveldan

    charveldan Well-Known Member

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    What u can do is fret the 6th and or 5th string which is low e and a on the 5th and 7th fret while facing the cab and crank the amp to get it howling.

    Thats how alot of pros do it and when they find the sweet spot for that gig or venue they mark the floor with a piece of gaff tape so the know where to stand.
     
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  10. dreyn77

    dreyn77 Well-Known Member

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    multiple silly pedals into the front of the amp.
    I got the VH eruption sound from a 5010 and the MXR 6 band EQ pedal and the phase 90 pedal. the amps volume could be set anywhere, but I had the same sound type and feedback with the amps Vol setting on '0.5'.
     
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  11. dreyn77

    dreyn77 Well-Known Member

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    I posted the settings ages ago. I think it was in the tone zone.
     
  12. charveldan

    charveldan Well-Known Member

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  13. Gianni

    Gianni Well-Known Member

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    CharvelDan,

    Thank you very much for the useful info.
    I just knew you could do a lot better! ;)

    I did enjoy your YouTube videos too.
     
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  14. Gianni

    Gianni Well-Known Member

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    Dreyn77,

    Thanks a lot for the useful info.

    You’ve got too many posts, mate, but I’ll look for it.
     
  15. blues_n_cues

    blues_n_cues Well-Known Member VIP Member

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    fresh strings and maybe even a compressor for added sustain if needed.:yesway:
     
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  16. 2203xman

    2203xman Well-Known Member

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    Sometimes you can create some sustained feedback just by creating a 'kind of pich harmonic followed by some vibrato.Sort of the same technic that EVH uses on every note he plays by holding the pick between the thumb and middle finger.This feels a little strange at first,but can spice up your tone a bit.
     
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  17. Gianni

    Gianni Well-Known Member

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    Blues n Cues,

    Thanks a lot for your input.

    I’ve just listened to ‘Stratisfied’ in ReverbNation, and I can’t tell you how ‘stratisfying’ it was for me too!
    What a lovely piece of music; so sweet and aggressive at the same time.

    Bloody hell, mate. You’re a guitar God!
     
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  18. Gianni

    Gianni Well-Known Member

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    2203xman,

    Thanks a lot for your interesting, and spicy, input.
     
  19. ampmadscientist

    ampmadscientist Well-Known Member

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    Science of Sustain
    is a positive feedback loop, which originates at the strings.

    The sound comes from the string, into the pickup, through the amp, out of the speaker, thru the air (as acoustic waves), which then reaches the guitar, and re-vibrates the string, starting the loop cycle over again.

    For example, if the acoustic sound reaches the guitar in-phase to the original string vibration, sustain will occur.

    If the sound reaches the string 180 degrees out-of-phase...
    cancellation occurs. Sustain is prevented.

    Then, the phase alignment of the guitar VS. acoustic wave from the speaker becomes pretty important.

    But wait, there's more...
    The wood that the guitar is made out of, can effect sustain dramatically. And completely independent of the hardware, pickups, and strings.

    I may have a rock maple Gibson L6-S, and no matter what hardware or pickups, it won't sustain. It's dead as a blanket.

    Then I take the same hardware and pickups, put it on a mahogany body, and it sustains like crazy.

    So there is a lot more to Science of sustain than just the phase alignment, strings, pickups, and electronics. More Importantly it's a function of guitar wood, construction and materials, in a vastly underrated way.
     
    Last edited: Sep 22, 2014
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  20. dreyn77

    dreyn77 Well-Known Member

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    I think my settings were, bass, mids, treble, and gain all 10, vol 0.5, pres, 'don't remember', mxr EQ frown boost and phase 90, slowish speed.
     

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