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    TaylorFade's Avatar
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    My test: SounDigital Nano 400.1

    I've been looking at these things since the little 250.2 came out. And they really piqued my interest when Murilo put them up on sale. For a couple reasons... obviously the size, the name and of course, the price. How do they make them so small? And how can they sell them so cheaply? I don't know, but let's take a look.

    Murphy got one for sub duty in the wife's car so he had one on hand. We'll just assume the rest of the line's performance is similar to the 400.1.

    They come in this little box. Which I think is just... awesome. Lol. Looks like it could be hanging on the rack at the convenience store. Maybe they should be?



    It's really difficult to get an idea of how small this thing really is until you get one in your hands. It's tiny. I love it. No frills. It's just a circuit board in a plexi box. Very cool. I've heard others say the fan is kinda loud. I didn't even hear it so take that for what it's worth.

    The input side will seem rather anemic if you're used to 4awg inputs and 8awg outputs from other highs amps, but I actually like these little terminals. All you need is a little micro screwdriver that you probably already have to set your gains. Or, if you're like I am and set your gains with your pocketknife, a teeny tiny flathead is cheap. That's AudioTechnix 10awg speaker wire for power and ground. I don't think much bigger would go. And I think those speaker outs might hold 12awg. Maybe.



    Confession... SD's crossovers confuse the crap out of me. There's no selector for LPF or HPF. I ran them both wide open and it made noise so I guess the tones I was playing were in the passband. Was there a manual? Maybe I should have looked at that if there was. Anyone that knows how the hell these work, feel free to chime in; because I'm stuck in a "Wait... wut?" loop.

    The "HI" says 5-1khz. I assume that's a 5khz to 1khz high pass filter. The "LO" says 50-20khz. I'll assume that's full range. If that's the case, I was running the "LO" full range, yet high passing at 1khz? I'm lost. Or is that the "HI" range? Perhaps I was low passing everything from 1khz down. Wait... wut?



    Anyway... I hooked up the scope unloaded. I was curious about what kind of voltage it was going to make, but all I was getting was millivolts. Either the thing needs a load or I'm a retard and one of the DMM leads came out of the itsy bitsy speaker wire. I suppose we should go with retard there. Either way... this was as "clean" as I could get it. I quote "clean" because it's kinda... fuzzy. But it resembled a round wave. Scope says 28.4v, so let's go with that.



    Hooked her up to a pair of D2 subs in series for a 2ohm nominal. Power was supplied by a single G31 batt. Battery power only. HU was an Alpine 9855, volume 28/35 further attenuated by a PAC knob at half. I reckon that's about what normal listening positions would be. It still took very, very little gain to get where we were. I kept the scope on it while clamping, but the battery died half way through testing. I'll vouch for the wave staying "clean" under load even though I didn't get any pics of it in action.



    So, using different notes to get different reactive...

    5.8 amps & 26 volts = 151w rising to 4.5ohms.

    8 amps & 24.5 volts = 251w rising to 3.5ohms.

    I drove it into a soft clip and got 6.2 amps & 33 volts = 204w rising to 5.3ohms.

    All of these barely got into the battery and were all around 12.7vdc. SD says 400w @ 2ohm @ 12.6v. No doubt that at alternator charging levels or at actual rated impedance, you would get close to 2ohm rated power AFTER rise. That's a good thing.



    So, in conclusion... I can't speak for the "SQ" of them since this was only on subs, but I was surprised how loud 250w was on a pair of 12's. I'm a little leery of the fuzziness of the wave but the price is a little too good and the size a little too small not to try some on my highs and get a listening impression. Maybe they lose some of the "clean up" bits to make the 400 watter and the two and four channels are cleaner. I can't see using these on my sub stage. But SD makes bigger amps for that.



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    Re: My test: SounDigital Nano 400.1

    That amps awesome






    REFS alot

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    Re: My test: SounDigital Nano 400.1

    excellent review.



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    Re: My test: SounDigital Nano 400.1

    how much are these lil wonders?



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    TaylorFade's Avatar
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    Re: My test: SounDigital Nano 400.1

    Quote Originally Posted by nu2spl View Post
    how much are these lil wonders?
    SD250.1 is now $99
    SD250.2 is now $99
    SD400.1 is now $159
    SD400.4 is now $159



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    Re: My test: SounDigital Nano 400.1

    Quote Originally Posted by TaylorFade View Post
    SD250.1 is now $99
    SD250.2 is now $99
    SD400.1 is now $159
    SD400.4 is now $159
    wow good pricing



    bought from: wccoug21 sundownz thegreatestpenn loudwhat? woofercooker jonny101abc spooney fasfocus00

    sold to: jpx18 Nateberrier Ge_off_me spm_215 2lo2flo akheathen etm34 djjdnap jfroghobo traded: SPLaudio Zeuslicious

    under construction:
    1992 Toyota Paseo(1) Pioneer DEH-P500UB head unit(2)American Bass VFL 500.1 amps(4) stinger batteries,building 2 10's in tubes

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    Re: My test: SounDigital Nano 400.1

    Enjoyable read. Good sense of humor and good write-up.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

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    Re: My test: SounDigital Nano 400.1

    Dammn to bad this wasn't the 400.4. I assume the xovers are the same on all those lil amps???




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    Re: My test: SounDigital Nano 400.1

    thats a huge dmm!



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    Re: My test: SounDigital Nano 400.1

    "1 channel 1ohm/2ohms" does that mean it does the rated 500 watts at both 1ohm and 2ohm? Neat little amp. That's quite a bit of power in such a small amp. Is the 250 even smaller?!



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    Re: My test: SounDigital Nano 400.1

    Where can you buy these?



    2012 Civic Si Sedan

    .:Real playas ride slow loud and bangin:.

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    Re: My test: SounDigital Nano 400.1

    I looked at these amps and for a little more money or almost the same the Rockford PBR (also a very tiny amp) won my vote and it did not disappoint.




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    Re: My test: SounDigital Nano 400.1

    Quote Originally Posted by naughtyca View Post
    I looked at these amps and for a little more money or almost the same the Rockford PBR (also a very tiny amp) won my vote and it did not disappoint.
    The Rockfords are little powerful amps but they get REALLY HOT!!!! We switched to using the Soundstream Nano's in their place...



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    Re: My test: SounDigital Nano 400.1

    they do tend to run hot but it never went out on me even after 9hour drive with very less stopping.




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    Re: My test: SounDigital Nano 400.1

    looking at buying these come spring. How are they holding up so far? any problems?




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