McIntosh Power Guard lights up in rhythm with music

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.

Living Room Music-2.0 Polk Legend L800 | 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-7.2.4/11.1 (Atmos/Auro-3D) Polk LSiM707, LSiM706c, LSiM702 F/X [x4], height LSiM703 [x4], HSU VTF-15H MK2 Dual | Marantz AV8805A | Appollon NC500 11ch | Sony UBP-X800 | AppleTV | JVC RS2100
Game Room-5.1 Polk LSi25, LSiC, LSiF/X, DSW microPRO3000 | Marantz SR7009 | AppleTV | Xbox One S | Sony PS2, PS3 | Nintendo Wii | Gaming PC | Sony 75" LCD
Master Bedroom Music-2.0 Totem Hawk | Rotel RA-1570 (Treble) | Rotel RB-1590 (Bass) | Marantz HD-CD1
Office-2.0 Ascend Acoustics Sierra LX | Marantz PM-10 | Marantz SA-10 | SONY PS-HX500
Daughter's Bedroom 1-2.0 TBD Martin Logan Forte
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 | TV
Maintenance: Pro-Ject VC-S Record Cleaning Machine

Comments

  • BlueFox
    BlueFox Posts: 15,255
    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.
    Lumin X1 file player, Westminster Labs interconnect cable
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    Three 20 amp circuits.
  • motorstereo
    motorstereo Posts: 1,818
    Lighting up the pg lights like that is a sure fired way to destroy something expensive.
  • mhardy6647
    mhardy6647 Posts: 30,088
    edited November 2021
    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: 3,268
    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: 1,818
    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: 462
    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 | 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-7.2.4/11.1 (Atmos/Auro-3D) Polk LSiM707, LSiM706c, LSiM702 F/X [x4], height LSiM703 [x4], HSU VTF-15H MK2 Dual | Marantz AV8805A | Appollon NC500 11ch | Sony UBP-X800 | AppleTV | JVC RS2100
    Game Room-5.1 Polk LSi25, LSiC, LSiF/X, DSW microPRO3000 | Marantz SR7009 | AppleTV | Xbox One S | Sony PS2, PS3 | Nintendo Wii | Gaming PC | Sony 75" LCD
    Master Bedroom Music-2.0 Totem Hawk | Rotel RA-1570 (Treble) | Rotel RB-1590 (Bass) | Marantz HD-CD1
    Office-2.0 Ascend Acoustics Sierra LX | Marantz PM-10 | Marantz SA-10 | SONY PS-HX500
    Daughter's Bedroom 1-2.0 TBD Martin Logan Forte
    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 | TV
    Maintenance: Pro-Ject VC-S Record Cleaning Machine
  • mhardy6647
    mhardy6647 Posts: 30,088
    edited November 2021
    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: 30,088
    edited November 2021
    I just looked at the manual for the MA5200: it calls for "8 ohm" loudspeakers.
    https://www.musicdirect.com/documents/pdf/AMCHMA5200.pdf

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    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.

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  • mhardy6647
    mhardy6647 Posts: 30,088
    Mac doesn't seem too concerned with "momentary illumination", though.
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  • tratliff
    tratliff Posts: 1,345
    Never seen my power guard!
    2 Channel
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    Vintage
    Pioneer SA-9800, Pioneer TX-9800, Pioneer PL-630 w/Ortofon 2m Bronze, Technics RS-1500, PSB Imagine T2's