My humble review of the Benchmark AHB2 and LH4

Discussion in 'Audio Hardware' started by Tone?, Jun 1, 2021.

  1. avanti1960

    avanti1960 Forum Resident

    Location:
    Chicago metro, USA
    geez, can't a guy experiment a little :)
     
  2. avanti1960

    avanti1960 Forum Resident

    Location:
    Chicago metro, USA
    of course, just trying to say it should sound at least as powerful as the reigning amp. you really don't know until you plug it in and play it. i had an 80 watt amp and a 150 watt amp by the same manufacturer and the 150 watt amp sounded much more powerful.
    also had two different 100 watt amps by the same manufacturer and one of them sounded much more powerful.
     
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  3. avanti1960

    avanti1960 Forum Resident

    Location:
    Chicago metro, USA
    yes, uno- for now.
     
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  4. Glmoneydawg

    Glmoneydawg Forum Resident

    Location:
    Ontario Canada
    Of course!...you get an amp,@Slippers-on gets a bottle of scotch...it's a win for everybody;)
     
  5. avanti1960

    avanti1960 Forum Resident

    Location:
    Chicago metro, USA
    ever try it without the subwoofers adding the grunt work?
     
  6. avanti1960

    avanti1960 Forum Resident

    Location:
    Chicago metro, USA
    and a Labatts light.
     
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  7. avanti1960

    avanti1960 Forum Resident

    Location:
    Chicago metro, USA
    i wasn't opposed to looking at bigger amps either, saw a used Krell DUO XD and a Pass XA30.8 but after handling and shipping the 110 lb carton of the Parasound JC5 I thought about going small. Still has to sound great though, open to the possibility of adding another if needed.
     
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  8. Glmoneydawg

    Glmoneydawg Forum Resident

    Location:
    Ontario Canada
    Yep I've had big azz amps for about 40 years of my audio life....but i still think back and wonder occasionally about the NAD 3020? Amp i had before all that.20 Watts i think?It successfully replaced a 150 watt Sansui amp that would shut down on overload trying to drive my M+K S1a speakers and Goliath sub.Weird little hobby we have here.
     
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  9. avanti1960

    avanti1960 Forum Resident

    Location:
    Chicago metro, USA
    very weird. i had a conversation with someone who got tired of the euphonic sound and i could not understand. now i am right there.
     
  10. RZangpo2

    RZangpo2 Forum Know-It-All

    Location:
    New York
    Have them both. Love 'em. Get the DAC3, you won't regret it. A trifecta of goodness.

    Actually I have two AHB2s, run in bridged mono. The AHB2's noise spec is 3db lower when run in bridged mono. Yes, you can hear the difference. Subtle but very real.
     
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  11. Glmoneydawg

    Glmoneydawg Forum Resident

    Location:
    Ontario Canada
    I've always felt that "euphonic" sound is easier to achieve with transducer gear,speakers,cartridges ect.I like to think amps and preamps are at the point where accurate reproduction should be a given....resolution being the only acceptable improvement.That's just my 2 cents for what it's worth:)
     
  12. Tone?

    Tone? Forum Resident Thread Starter

    Location:
    San Francisco

    I had the DAC3 for awhile and didn’t like it as much as my Marantz.
    Go figure.
     
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  13. Tone?

    Tone? Forum Resident Thread Starter

    Location:
    San Francisco
    curious to see what you think of it.

    especially since you’ve had some great amps there.

    congrats !
     
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  14. timind

    timind phorum rezident

    I've listened without the subs, but as you may know, my room is large and the speakers are well away from any boundary, so getting any real bass isn't going to happen with monitor speakers. That said, both the PSB Synchrony 1Bs, and the Chartwell LS6 speakers provide a fairly robust presentation through the Benchmark.
     
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  15. Slippers-on

    Slippers-on Forum Resident

    Location:
    St.Louis Mo.
    Lil bro....nothing wrong with experimenting! Especially when you gots deep pockets like your self!:D....nothing wrong with a little side bet, either!
     
  16. Slippers-on

    Slippers-on Forum Resident

    Location:
    St.Louis Mo.
    Almost sounds like mi man, only wanted to vent!
     
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  17. Black Elk

    Black Elk Music Lover

    Location:
    Bay Area, U.S.A.
    In case any of you are wondering (or haven't tried to find out for yourself), the protection circuitry in the AHB2 in bridged mode is very robust! A short while back we used one to measure some prototype speakers (WITHOUT crossovers) in an anechoic chamber. Unfortunately, the guy who usually runs the Audio Precision measurement system was not available, so the chamber owner stepped in, and he was not an AP expert by any stretch of the imagination. Due to his clumsiness, not only did we trip the AHB2 a few times, but he burned out a very expensive tweeter. Fortunately, we had spares on hand.
     
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  18. jazzsurfer

    jazzsurfer Forum Resident

    Location:
    new york
    It only has balanced outputs correct?
     
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  19. Helom

    Helom Forum member

    Location:
    U.S.
    If that’s the case you might want to try the LA4 rather than the AHB2.
     
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  20. Helom

    Helom Forum member

    Location:
    U.S.
    It has both balanced and single-ended outputs. It can also run them simultaneously.

    The remote works a little better now that I removed the protective film from the display, but it’s still finicky. Seems to have max range of about 10’.
     
  21. Ingenieur

    Ingenieur Just a dog looking for a home...

    Location:
    Back in PA
    The AHB2 is unusual

    from Stereophile
    8 ohm stereo 100 W, hard clip
    [​IMG]

    Mono bridged, 8 Ohm
    400 W
    [​IMG]
     
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  22. Tone?

    Tone? Forum Resident Thread Starter

    Location:
    San Francisco

    Explain?
     
  23. Harris11235

    Harris11235 Forum Resident

    Location:
    Minneapolis, MN
    Just catching up on this - sounds like I’m sending a package to St. Louis!
     
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  24. Helom

    Helom Forum member

    Location:
    U.S.
    The AHB2 has a tightly regulated power supply so when it does clip, it clips hard. It’s not a gradual increase in distortion, rather it goes from low distortion to peak distortion almost instantaneously. Basically, it doesn’t have the power reserve for dynamic swings that more typical A/B amps possess. Luckily its protection circuitry should keep any clipping from damaging the speakers. But at the end of the day it’s not a powerhouse, and should be viewed as the ~110 WPC amp it is. If a system needs an amp that can supply even 140 WPC during dynamic swings (into 8 ohm nominal), the AHB2 should not be used.
     
    Ingenieur likes this.
  25. Ingenieur

    Ingenieur Just a dog looking for a home...

    Location:
    Back in PA
    this^
    No capacitor reserve
    It is on or off
    On < cutoff
    Off > cutoff
    SMPS vs linear PS

    not a bad thing, a design choice
    Obviously a good one, impeccable performance, excellent price and value.
     

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