S35 Center Channel "Popping"

Hello! I recently upgraded my home theater to digital with an Onkyo TX-NR686. I currently have a 5.0 setup (no subwoofer) with new Polk Signature S20's up front and a Signature S35 in the center (the S35 was picked out of necessity due to space constraints). My surrounds are old Philips satellites which work fine but will eventually be replaced with S15's. Thus far, I'm loving this setup with one troubling exception.

The problem that I'm having is with the S35 making alarming "popping" noises during certain low-frequency sound effects. I should note that I'm only having this problem with a particular BluRay (Star Wars: Rogue One) while listening at theater volumes (60-65) with the receiver set to the preferred DTS-HD Master mode. The issue goes away if I manually apply different audio codecs (which seem to draw back the low frequency sound effects).

I have the Onkyo's center channel crossover set to its 200 Hz max and the LFE to it's highest negative setting. It seems like the really low frequency effects shouldn't even be making it to the S35 (which is rated for as low as 53 Hz), but the "popping" persists. I also checked all of my wiring and switched out the HDMI cable running between the Onkyo and the BluRay player with no change.

I should note that the S35's "popping" happens both when I set the BluRay player's output to bitstream (allowing the Onkyo to do the decoding) or to PCM (allowing the BluRay player to do the decoding). No change at all.

Oddly, none of my other BluRays seem to cause the "popping." For instance, the S35 has zero issues with Harry Potter: Deathly Hallows Part II, which has some pretty deep low frequency effects and also uses the DTS-HD Master audio codec.

In the end, I'm trying to figure out if I have a problem with my Onkyo's center channel, the Polk S35 center speaker, or if this is simply an anomaly limited to the Rogue One BluRay (which I now avoid playing a theater sound levels out of fear of damaging the S35).

Thanks in advance for your trouble-shooting ideas.

Comments

  • mlistens03mlistens03 Posts: 2,673
    edited February 14
    First off, welcome to Club Polk!

    Is it a metallic kind of clapping sound?

    If so, you could be pushing it too hard and "bottoming out" the midbass drivers. This means that the speakers are moving farther than they are capable of, and the voice coilings are smacking into the back of the magnet. Be wary of this, it can cause significant damage to the drivers If continued for too long.

    I don't know much about the Signatures but I'd assume they aren't designed for low bass, especially if the S35 is the slim model.

    I'd cut low frequencies from the center in the menus of your receiver, and you should be good to go. :)

    Others here are more knowledgeable and may be able to help you if there is more to this issue.

    Rock on! -Micah
    Not Tom or Trey or Jim just Micah
    KEF Q150s, NAD 1155 preamp and 4155 tuner courtesy of DaddyJT, NAD C352 playing power amp, BJC Belden cables, Technics SL3200, Marantz CD6004 courtesy of Clipdat, Salamander Archetype rack, Millenium Falcon :)
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.

    Resident Child of Club Polk
  • ClipdatClipdat Posts: 7,539
    mlistens03 wrote: »
    I'd cut low frequencies from the center in the menus of your receiver

    Sounds like he already did that:
    south2027 wrote: »
    I have the Onkyo's center channel crossover set to its 200 Hz max and the LFE to it's highest negative setting. It seems like the really low frequency effects shouldn't even be making it to the S35 (which is rated for as low as 53 Hz), but the "popping" persists.

    If it only happens with the one movie, I would wager that it's something about that particular disc/movie.
    "Electronic music is human sound adapting to indulge technology, and for some, it feels like the signature sound of energy. New and abstract sounds over hypnotic rhythms can conjure vast soundscapes for escape, pleasure, and transcendence."
  • mlistens03mlistens03 Posts: 2,673
    Clipdat wrote: »
    mlistens03 wrote: »
    I'd cut low frequencies from the center in the menus of your receiver

    Sounds like he already did that:

    Ah. Yes, I see that now. Sorry for filling your thread needlessly OP!
    Not Tom or Trey or Jim just Micah
    KEF Q150s, NAD 1155 preamp and 4155 tuner courtesy of DaddyJT, NAD C352 playing power amp, BJC Belden cables, Technics SL3200, Marantz CD6004 courtesy of Clipdat, Salamander Archetype rack, Millenium Falcon :)
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.

    Resident Child of Club Polk
  • polrbehrpolrbehr Posts: 2,471
    edited February 14
    @Clipdat is likely correct, and it could be that particular movie; it also could be the volume level you’re listening to it.
    I had a CSi30 center in a similar configuration, and there was one part of War of the Worlds (when the first walker came out from under the street) that would cause that that center to buzz like it was distorting. So it’s not unknown to happen especially with a center that has smaller drivers. And for the record I have an S35 now too.

    Welcome to the Forum !
    So, are you willing to put forth a little effort or are you happy sitting in your skeptical poo pile?


    http://audiomilitia.proboards.com/
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