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    Soundqubed Q1-750 1% thd vs 5% thd

    Okay, so ive been searching for this but have come up with nothing or do not understand what or how it works, bassically i am want to purchase the Q1-750d amp, on the soundqubed website it says (Output Power 14.4V @ 1% THD) 300X1 @ 4 ohm,500X1 @ 2 ohm,750X1 @1 ohm
    (Output Power 14.4V @ 5% THD) 1000X1 @ 1 ohm
    so bassically am i getting 750watts or 1000 watts, i know thd has something to do with clipping and harmonics and yadiyada but ive read a few things but dont fully get it.







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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    Quite simple, if you want a cleaner signal, give it 750, if you want to distort a little more but be a little louder, set it for 1000



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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    so it is doing 750 @ 1ohm or doing 1000 @ 1 ohm, or is it rated at 750 @ 1 ohm but is able to do 1000




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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    SQ products are underrated. So I sure you are getting more than 750rms watts, as for the THD...In my opinion, 1-3% isn't really audible. But the 5% is somewhat. It's just a distortion level, depending on your electrical I'm sure you can get closer to the 1000 rms watts out of it without 5% THD.
    I had the AQ/SQ 1200.D and I was getting around 1400rms on 13.8volts



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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    i was actually between the 1200d and the 750d, i just thought if i could get 1000 CLEAN watts out of the 750d @ the 1ohm and it was cheaper might as go for it, but i think i will just say **** it, put up the extra money and go with the 1200, thanks you guys, i really just wanted to understand what that thd was, but i kinda get it now




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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    and plus if i get the 1200d i can wire it to 2ohms instead of the 1ohm and it should be easier on my electrical and still get more @ 2 ohms than the 1ohm on the 750




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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    The lower the THD percentage you maintain the cooler and more efficent the amp will be. At 10% THD you will be burning woofers at a very rapid rate. I suggest using a larger amp to keep the distortion levels down and maintain the highest sound quality possible.
    Total harmonic distortion - Wikipedia, the free encyclopedia
    Last edited by USAMPFREAK; 02-06-2013 at 12:59 PM. Reason: Added link



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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    For subs under 10% thd is usually not noticeable. Thd and clipping are different. When. You look at clipping on a scope it is a flat spot on the wave peaks thd is wave deformation/unsmooth wave line. It would be easier to explain if I had some scope screen shots.



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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    The best advice is to set your amp to produce power with out clipping, or at least a soft clip at most. You can pick up a real cheap o-scope like a pocket nano to ensure you have a good signal.




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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    i know how to set the gains using a dmm, but how would i find out exactly how many watts the amp




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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    Quote Originally Posted by USAMPFREAK View Post
    The lower the THD percentage you maintain the cooler and more efficent the amp will be. At 10% THD you will be burning woofers at a very rapid rate. I suggest using a larger amp to keep the distortion levels down and maintain the highest sound quality possible.
    Total harmonic distortion - Wikipedia, the free encyclopedia
    how exactly would i test for the THD




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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    Quote Originally Posted by scottcrotch View Post
    i know how to set the gains using a dmm, but how would i find out exactly how many watts the amp
    A DMM does not allow you to determine if you are allowing the single to be clipped or not.

    ---------- Post added at 12:19 PM ---------- Previous post was at 12:19 PM ----------

    Quote Originally Posted by scottcrotch View Post
    how exactly would i test for the THD
    Using an 0-scope.




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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    well i figure if i set my gains correctly with the dmm and turn it down a little bit then i should be good




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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    Quote Originally Posted by pro-rabbit View Post
    A DMM does not allow you to determine if you are allowing the single to be clipped or not.

    ---------- Post added at 12:19 PM ---------- Previous post was at 12:19 PM ----------



    Using an 0-scope.
    Where can i get or what brand is a cheap or should i say inexpensive O-Scope




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    Re: Soundqubed Q1-750 1% thd vs 5% thd

    Quote Originally Posted by scottcrotch View Post
    Okay, so ive been searching for this but have come up with nothing or do not understand what or how it works, bassically i am want to purchase the Q1-750d amp, on the soundqubed website it says (Output Power 14.4V @ 1% THD) 300X1 @ 4 ohm,500X1 @ 2 ohm,750X1 @1 ohm
    (Output Power 14.4V @ 5% THD) 1000X1 @ 1 ohm
    so bassically am i getting 750watts or 1000 watts, i know thd has something to do with clipping and harmonics and yadiyada but ive read a few things but dont fully get it.
    ...................

    PS: OK, I just read the original post more carefully and saw that power output at 1% THD is also given. Anyways. I personally would recommend to stick with the 1% THD figure. However, when you set gain use a -5dB test tone unless you play test tones on daily basis. Normal music hardly every reaches -5dB, and those are short lived peaks.
    Last edited by zako; 02-07-2013 at 12:32 AM.




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