McIntosh Power Guard lights up in rhythm with music

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Wow, I haven't been here in a while and I like the new forum look.

It seems I can get McIntosh Power Guard to light up in rhythm with music. BTW we're in the process of moving, hence grills on, on the L800's and ignore the clutter.

https://youtu.be/XnjkeajqYAM
  • Living Room Music-2.0 Polk Legend L800 | SVS SB1000Pro | McIntosh C70 | McIntosh MA5200 (Treble) | McIntosh MC452 (Bass) | Sublimeacoustic K231 Active xover | Denon DP-2500A | Denafrips Ares II | Belkin Soundform Connect | iPad Air USB to DAC
  • Media Room Ht-7.2.6/13.1 (Atmos/Auro-3D) Polk LSiM707, LSiM706c, LSiM702 F/X [x4], height LSiM703 [x6], HSU 15" Quad | Trinnov Altitude 20 | Rotel RB-1590 (L/R) | Appollon NC500 11ch | Sony UBP-X800 | AppleTV 4K | JVC RS2100 | 150” Elite Screen Acoustic Pro UHD
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Comments

  • BlueFox
    BlueFox Posts: 15,251
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    mpitogo wrote: »
    Wow, I haven't been here in a while and I like the new forum look.

    You are deep, deep inside the minority with that opinion.
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  • motorstereo
    motorstereo Posts: 2,063
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    Lighting up the pg lights like that is a sure fired way to destroy something expensive.
  • mhardy6647
    mhardy6647 Posts: 33,239
    edited November 2021
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    Hmm.
    I thought the purpose of the Power Guard was to prevent "destroy[ing] something expensive"...?

    EDIT: That said -- I would think that a condition that makes those lights flicker more than very occasionally suggests 1) there is something quite wrong in the chain -- perhaps the match of the amplifier and the load impedance and/or 2) the SPL is very dangerous.
    I guess there's also an option 3), which is that the amp is way underpowered (e.g., at least 3 dB; which is a factor of two in output power into the load) for the application.

  • DaveHo
    DaveHo Posts: 3,484
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    Not that hard to clip a 100 WPC amp. But yeah, I'd say you need more amp if you like to listen loudish.
  • motorstereo
    motorstereo Posts: 2,063
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    mhardy6647 wrote: »
    Hmm.
    I thought the purpose of the Power Guard was to prevent "destroy[ing] something expensive"...?
    Yes occasionally lighting up the pg's won't do any harm. But when it becomes a steady flicker the overdriven amp will take out tweeters and or damage crossovers.
    I agree with what was mentioned about either turning it down or buying a more capable amp.

  • mpitogo
    mpitogo Posts: 491
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    The MA5200 without autoformers is ~150WPC into 4ohms. more power is on order for the treble/SDA section, ~320WPC into 4ohms. Bass already fed with 450WPC and fairly easy for the amp.
    • Living Room Music-2.0 Polk Legend L800 | SVS SB1000Pro | McIntosh C70 | McIntosh MA5200 (Treble) | McIntosh MC452 (Bass) | Sublimeacoustic K231 Active xover | Denon DP-2500A | Denafrips Ares II | Belkin Soundform Connect | iPad Air USB to DAC
    • Media Room Ht-7.2.6/13.1 (Atmos/Auro-3D) Polk LSiM707, LSiM706c, LSiM702 F/X [x4], height LSiM703 [x6], HSU 15" Quad | Trinnov Altitude 20 | Rotel RB-1590 (L/R) | Appollon NC500 11ch | Sony UBP-X800 | AppleTV 4K | JVC RS2100 | 150” Elite Screen Acoustic Pro UHD
    • Game Room-5.1 Polk LSi25, LSiC, LSiF/X | Marantz SR7009 | AppleTV 4K | Xbox One S | Sony PS2, PS3 | Nintendo Wii | Gaming PC | Sony 75" LCD
    • Master Bedroom Music-2.0 Totem Hawk | Marantz PM-10 | Marantz SA-10 | SONY PS-HX500
    • Office-2.1 B&W Formation Duo and Bass
    • Orphan-2.1 Ascend Acoustics Sierra LX, DSW microPRO3000 | Rotel RA-1570 | Marantz HD-CD1
    • Daughter's Bedroom 1-2.0 TBD Martin Logan Forte | Roku TV
    • Guest Room 2-2.0 Klipsch RP-600M | Martin Logan Forte
    • Guest Room 3-3.0 Martin Logan Motion 40, 50XT | Onkyo TX-SR705 | Apple TV | Samsung 55" TV
    • Guest Room 4-2.0 QAcoustics 3030i | Sansui AU-6900 | Topping DX7s | Sansui FR-1080 | Fire TV
    • Maintenance: Pro-Ject VC-S Record Cleaning Machine
  • mhardy6647
    mhardy6647 Posts: 33,239
    edited November 2021
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    mpitogo wrote: »
    The MA5200 without autoformers is ~150WPC into 4ohms. more power is on order for the treble/SDA section, ~320WPC into 4ohms. Bass already fed with 450WPC and fairly easy for the amp.

    Well, that's all well and good -- but if the Power Guard lights are flickering more than occasionally, you're asking more of the amplifier than its designers are happy with it giving. That's what the circuit is there for, and the lights are there to tell the end user it is woking.
    The fault may lie in the amp, the load, or the volume.
    The easiest to test: turn the volume down just a hair (2 or 3 dB more attenuation) -- should be barely audible (one may check the delta with an SPL meter at the listening position if one is curious enough) but should take the amplfier out of its danger zone. If there is any audible impact, it should be beneficial.




  • mhardy6647
    mhardy6647 Posts: 33,239
    edited November 2021
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    I just looked at the manual for the MA5200: it calls for "8 ohm" loudspeakers.
    https://www.musicdirect.com/documents/pdf/AMCHMA5200.pdf

    ug2bsytzkpxj.png
    z0dm3p6dlh8o.png

    The L-800 isn't nominally 8 ohm, IIRC.
    EDIT: Occam's Razor and all that... my guess is the load impedance is stressin' the little MA5200 past whatever its Power Guard" figures it should be safely giving.

    60d97msab8ht.png



  • mhardy6647
    mhardy6647 Posts: 33,239
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    Mac doesn't seem too concerned with "momentary illumination", though.
    xo8ywwiai21y.png
  • tratliff
    tratliff Posts: 1,683
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    Never seen my power guard!
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