Solid-State Power Amp Adventures

Discussion in 'Power Amps' started by purr1n, Jan 24, 2017.

  1. Armaegis

    Armaegis Friend

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    I think the general fuzzy exception is with OTL tube amps which require a certain load to operate within "optimal" parameters.
     
  2. foo_me

    foo_me Friend

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    I've been using my hd800 sdr and he500 using that type of adpater cable without any issues for 6+ months now.
    I hope there isn't any long-term issues but it's working fine so far.
    In fact, I've liked it so much, I got rid of all my headphone amps, and just use power amps for both speakers and headphones now.
     
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  3. JeffYoung

    JeffYoung Almost "Made"

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    The ad gives the bias current at 100mA. That's going to support at most 0.3 Class A watts into 8 ohms.

    FWIW, push-pull is still Class A when you're above the bias point. When the pulling side reaches -100mA of music signal the total (bias + music) goes to 0 and the transistor shuts off. At that point only the push side is working and you're in Class AB.
     
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  4. straydcat

    straydcat Rando

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    +1, also with some bass notes the sense of air developed up to the high frequencies comes through with no discontinuity, a drum thwack (in music), a deep bass note (generated to add suspense on shows or movies) just expands throughout the soundstage. The high frequency component that comes along with a bass wavefront is sensed and heard, along with how the wavefront decays in the recording space, organically.

    For folks considering this amp, I'm pretty sure it clips hard, when high levels of transient low bass power are required, mostly shows or blu-ray. I use our 60" 4k TV as a preamp of sorts to switch between video sources, through a deq2496 for room correction, then to a MyDac, all optically. Had to lower the 20-100hz boost the 2496 set in room correction, +12db at 20-40Hz for the MMGs lol. I did also run everything at first through the preamp section of a great sounding old modded Proton AI-3000 with the loudness button engaged as well.

    I don't remember it ever clipping with music, since most my music is from a laptop/Tidal via usb, direct to the MyDac and through a Lightspeed Attenuator to the STA200. I also don't remember it hard clipping through the 2496 before I tamed the bass boost while playing jazz or classical music concerts from youtube, *maybe* on hard piano strikes at the lower registers.

    I'm expecting a crown xls 2002 to be delivered in a couple of days rated at 650W into the 4 ohm maggies. I will probably definitively know if it's the STA200 or the speakers re: the hard clipping after I run the room correction again. I love this amp but reluctantly, I just *have* to see what I get with 650w on tap but not expecting much SQ-wise. If the MMGs die, I'll have to put our 1.6s to work.

    Hope this helps someone, I'm so glad membership to this board opened up again. Love the vibes on this board and been learning a lot from you guys since I found you a few months ago!
     
  5. bengo

    bengo Friend

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    You'll need probably some negative gain in the DEQ2496 else you will clip in the digital domain before you get anywhere near the amp. Check the output meter and adjust in Utility screen as needed.
     
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  6. straydcat

    straydcat Rando

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    Thanks, did that and it stopped clipping. I did replace it with a crown xls 2002 for raw power. Keeping the STA200, it did have better 3 dimensionality and depth of stage, including inner detail but need to run room correction again since replacing it to be sure.
     
  7. rlow

    rlow A happy woofer

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    Next amp to go up against Vidar is this one:

    Belles 150A Reference (V2):
    [​IMG]

    On holidays at the moment, but will do some serious listening starting next week.

    Will Vidar finally be dethroned??
     
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  8. Kernel Kurtz

    Kernel Kurtz Acquaintance

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    Now I'm no expert here, but I can safely say MMGs are just not going to be very satisfactory below 40Hz no matter what you drive them with. My MG12s response fall off quite rapidly below 45Hz and I can't imagine trying to somehow equalize that out. I'd expect the 1.6s to be only marginally better. If you are seriously looking for good bass down to 20Hz you should really be looking for a subwoofer(s).
     
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  9. bixby

    bixby Friend

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    Now THAT is an Amp! Sounded superb every time I got to hear it. Would be on my shopping list for sure!
     
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  10. Alaarx

    Alaarx Facebook Friend

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    Has anyone put ears to the First Watt SIT-2. The SIT3 is hitting production now and I'm interested but an audition will be nigh on impossible. Would be driving Dali Epicon 6 speakers.
     
  11. allegro

    allegro Almost "Made"

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    It is not an easy task to pair a dynamic sub with any Maggie. You have to keep the crossover freq low (like 30 Hz) to avoid screwing up the midrange. If you really appreciate Maggies and crave more bass you should be looking at larger Maggies or a Magnepan DWM Bass Panel.
     
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  12. JeffYoung

    JeffYoung Almost "Made"

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    I have my 0.7 Maggies quite happily paired with a PSA S1500. I've tried the crossover all the way down at 40 Hz, but I think I normally leave it around 55 Hz. YMMV.
     
  13. Kernel Kurtz

    Kernel Kurtz Acquaintance

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    Absolutely the best solution is bigger panels, but that is just not practical for everyone. I've had good luck pairing my subs, but no question relative placement is critical.

    Sounds about right. I'm at about 50 myself.
     
  14. artur9

    artur9 Rando

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    Loved my Belles. It's the amp that convinced me that amps do matter. In my dream world, I have Belles monoblocks.
     
  15. bengo

    bengo Friend

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    It's 4x the price of a Vidar so I don't think you should compare directly...
     
  16. Hrodulf

    Hrodulf MOT: Sonarworks

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    The inside looks worse than my first DIY project tho.

    I'd say, keep the crossover as high as possible. It really depends on crossover slope steepness and sub quality (how much 160Hz it puts out when playing back 80Hz and noise characteristics).

    The sub not only lets your system play lower, but it also relieves the speakers of playing much of the lower range, thus letting them play cleaner and louder.
     
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  17. rlow

    rlow A happy woofer

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    New retail, yes it's a fair bit more expensive obviously. For me, I picked it up used for only a few hundred bucks more than the new Vidar cost me.

    If there's anything under 2x new retail that would beat Vidar, I would love to know.

    At this point, I'm trying to find something used under 1.5x the price of Vidar that will beat it. Hoping the Belles is it.
     
    Last edited: Jul 12, 2018
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  18. alubis

    alubis Acquaintance

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    Read a lot of good impressions pairing this amp with dynaudio. Looking forward to hear your impression.

     
  19. Kernel Kurtz

    Kernel Kurtz Acquaintance

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    That is what I was thinking. That anyone thinks it is reasonable to make the comparison is a win for the Vidar in itself.
     
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  20. msommers

    msommers High on Epipens

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    Diminishing returns has to start somewhere. Additionally, those two amps might have a completely different presentation and tone to them (regardless of the price delta), making one more appealing than the other. Liking something because it's good value is one thing, and liking it because you actually like it is another.

    I'm glad you're doing the comparison @rlow and look forward to what you find!
     
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