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  1. #1

    Warm-up time for Pass amps?

    Hey gang,
    I know many folks here love and enjoy Pass Lab amps.

    Some of you may remember I built up two Nelson Pass-designed Amp Camp amps last summer.

    I've set these up again over the long Memorial Day holiday weekend to get some real hours on them and on my (also DIY) GR-Research X-LS Encore speakers (which I recently found out need 400 hours of running in), and have an anecdotal observation that they seem to require about an hour of warm-up time to fully come "on song". When I listen to them as soon as I switch them on, they seem to be a bit thin and 2-dimensional sounding. Once they've been on for an hour so, though, they really do sound very good, especially when run as a pair of bridged monos.

    Here they are set up on the floor in a quickie set-up configuration (sorry for the quality of the quickie iPhone 12 "snapshot")



    Is this observation consistent with your experiences? What do you guys that have a Pass Class A amp typically do? Do you leave the amp on all the time, or fire it up for listening sessions?

    Lastly, I'm not telling you guys anything you don't know, but Nelson Pass is a genius.

  2. #2
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    Re: Warm-up time for Pass amps?

    Nelson Pass IS a genius!

    Pass amps usually sound really good after about 20-30 minutes but I've found an hour or more really opens them up and makes them sing.
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  3. #3

    Re: Warm-up time for Pass amps?

    Quote Originally Posted by joeinid View Post
    Nelson Pass IS a genius!

    Pass amps usually sound really good after about 20-30 minutes but I've found an hour or more really opens them up and makes them sing.
    Ah, great! Thanks, Joe! I figured you'd chime in with your experience with several Pass and First Watt amps, so many thanks.

    Your observations are concordant with mine.

    Cheers.

  4. #4
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    Re: Warm-up time for Pass amps?

    My old XA60.5 amps sounded superb after an overnight run in and even beat MC2301's for a lot less money.
    Last edited by joeinid; May 31, 2021 at 06:25 PM.
    Franco Serblin Accordo Essence, Vienna Acoustics Haydn Jubilee, Wharfedale Linton w/ stands, Klipsch RB-75, Klipsch RP-160M.

    Job INTegrated. Luxman L-595a, NAD M33.

    NAD C 658 streamer.

    First Watt SIT-3, Job 250 Monos, NuForce STA200, AkitikA GT-102 amp, ASL Wave monos, Dennis Had 45 monos. Absolute Audio Labs PCF 25 amp (improved First Watt F7 super clone)

    RME Audio ADI-2 DAC FS, ModWright Ultimate Sony XA-5400ES.

    Burmester 948, McIntosh MCLK12, Kimber Kable, Siltech, Cardas, Avanti Audio cables.

  5. #5

    Re: Warm-up time for Pass amps?

    Quote Originally Posted by joeinid View Post
    My old XA60.5 amps sounded superb after an overnight run in and even beat MC2301's for a a lot less money.
    Yeah, that doesn't surprise. I've heard great things about the 60.8s, too.

  6. #6
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    Re: Warm-up time for Pass amps?

    Quote Originally Posted by Puma Cat View Post
    Yeah, that doesn't surprise. I've heard great things about the 60.8s, too.
    Our XA60.8’s are killer good. They will drive anything. Their real world specs are actually double their rated specs.


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  7. #7
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    Re: Warm-up time for Pass amps?

    I play one album as background before critical listening and don’t notice much change after that, so approximately 45 minutes. This has been consistent with a number of different Pass amps that I have owned over the years.
    Morgan

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  8. #8

    Re: Warm-up time for Pass amps?

    Quote Originally Posted by MPW View Post
    I play one album as background before critical listening and don’t notice much change after that, so approximately 45 minutes. This has been consistent with a number of different Pass amps that I have owned over the years.
    Great, thank you, Morgan. Very helpful. Anecdotally, it seemed like it was between 30 and 60 minutes.

    Cheers.

  9. #9
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    Re: Warm-up time for Pass amps?

    I've always left my Pass Labs products on 24/7 unless I was leaving for an extended period of time (usually several days) or there was a storm rolling through the area. The couple of times I did listen from cold, the only thinness I noticed was in the XP-10 and XP-22, not the X250.8. But. like others have said, give it 30-60 minutes and that sound was gone.
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  10. #10

    Re: Warm-up time for Pass amps?

    I've been listening to my little Amp Camp amps as bridged mono blocks since the beginning of the long holiday weekend, and I have to say that now that they are getting more hours on them, they are starting to sound very good indeed. Nelson Pass, I tell ya what...

    And...for 654 bucks, they're rather amazing.



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Warm-up time for Pass amps?

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