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  1. #1

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    Default Center channel (CSiA6) in Polk surround setup sounds off

    Hey everyone,

    I have this setup:

    Receiver: Denon AVR3312CI
    Front Left & Right: Polk RTI A9
    Center: Polk CSiA6
    Surround Left & Right: Polk FXiA6
    Surround Back Left & Right: Polk FXiA6
    Sub: Epik Empire
    Amp: Emotiva XPR-5 (for Fronts, Center, Surrounds)

    I've had this setup for about a year. Everything sounds great except the center channel. I wish I could accurately describe it but it just sounds like it's missing something, almost like it's out of place with the rest of the setup and missing a certain punch. Like I'm waiting for it to pop and come to life. During pure dialogue scenes it quite frankly hurts my ears. I setup the speakers running Audyssey on the Denon. Since then I've played with adjusting the channel level of the center and nothing seems to make a difference.

    Does anyone have any suggestions?

    Much appreciate any help!

    Thanks,
    Mike

  2. #2

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    Is the center channel set to small or large ? Use large and see if it sounds better.

  3. #3

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    Have you tried hooking it up to a differnt channel. Possibly sometnig wrong with the amp or the Denon. Switch the amplifier channels to see if there is a problem with the amp. I have the A6 for my center and it sounds great.
    Home Theater
    Onkyo PR-SC5508 Sharp LC-70LE847U
    Emotiva XPA-5 Emotiva XPA-2 Emotiva UPA-2
    Front RTi-A9 Wide RTi-A7 Center CSi-A6 Surround FXi-A6 Rear RTi-A3 Sub 2x PSW505
    Sony BDP-S790 Dishnetwork Hopper/Joey Logitech Harmony One Apple TV
    Two Channel
    Oppo 105D BAT VK-500 w/BatPack SDA SRS 2.3 Dreadnought Squeezebox Touch Apple TV

  4. #4

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    Default

    Also make sure it's wired up in phase, positive to positive, negative to negative.

  5. #5

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    It's also possible one of those jumpers isn't quite connecting and all you're hearing is the tweeter.
    Usher CP-6311, Shuguang S200MK, Shuguang S845MK, Pioneer BDP-51fd, Essence Audio HDACC, Douglas IC's, Douglas Alpha bi-wire SC's, Pangea/Douglas PC's, Epson 8100

  6. #6

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    All great suggestions here. I have a similar set up as you, pretty much just a different AVR. Mine is always set to 40hz running off the Emotiva, I've found myself bumping up the center volume quite often.

    As of recently, I set it a 60hz and this has made a significant difference.

    Another thing I've noticed, some movies have great intelligible dialogue, and others do not. Though I'm guessing this is not the case with you.
    Draggn' knee is exhilarating, 150mph wheel standers are pretty cool too


    Home Theater-7.2
    Display-SamsungPN64D8000 | Receiver-Onkyo TX-NR807 | Source-OPPOBDP-103 | Amplifiers-Emotiva; XPA-2 x2, XPA-3 | Speakers: PolkAudio; mains-RTiA9, rears-RTiA9, center-CSiA6, surrounds-FXiA6 | Sub-Epik Empire x 2 | Interconnects-Emotiva


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    First purchase will be; a pair of ? but I'd love a pair of SDA SRS

  7. #7

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    Thanks everyone for the responses.

    Confirmed that it is wired up in phase. Switched it to a different channel and it sounds the same.

    I changed the Center Channel to small and it seems to have made some difference. These are the settings as I have them now. Does anyone see something jump out at them that could be causing a problem?

    Front L & R -3.0db, Center -4.0db, Subwoofer -11.0db,
    Crossover Frequency: Front/Surround 80Hz, Center 60Hz
    Subwoofer Mode LFE+Main
    LPF for LFE 120Hz

    Thanks again!

  8. #8

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    I would set the center to 80hz if your going to be running your towers that high. Your center channel shouldn't really be set to a lower frequency than the the towers.

    Right now I have the following set.

    Front RTi A7's - Full Range
    Center RTi A4 60hz
    Surround FXi A4 60hz

    LFE 120hz
    Subwoofer No

    I do have a sub that I turn on for movies and video games but for general TV watching I just run my RTi A7's at full range.
    Last edited by jbooker82; 09-03-2013 at 02:33 PM.
    AVR: Onkyo Tx-NR808
    Amplifier: Carver A-753x 250 watts x 3
    Fronts: Polk RTI A7 (modded by Trey VR3)
    Center: CSI A4 (modded by Trey VR3)
    Rear: FXI A4
    Sub: Polk DSW Pro 660wi
    TV: LG Infinia 50PX950 3D
    Speaker Cable: AudioQuest Type 8
    IC: AudioQuest Black Mamba II

  9. #9

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    Top be honest, I don't even know what those frequencies do...should I lower the towers then? Audyssey had set them all to 80 but I lowered the center to 60 for testing.

  10. #10

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    The Xo frequency is where it starts to roll off or switch where the sound is going to be played. Most people cannot hear or tell direction with low frequency. So at 60z it starts re routing sound from the center channel to sub.
    AVR: Onkyo Tx-NR808
    Amplifier: Carver A-753x 250 watts x 3
    Fronts: Polk RTI A7 (modded by Trey VR3)
    Center: CSI A4 (modded by Trey VR3)
    Rear: FXI A4
    Sub: Polk DSW Pro 660wi
    TV: LG Infinia 50PX950 3D
    Speaker Cable: AudioQuest Type 8
    IC: AudioQuest Black Mamba II

  11. #11

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    Quote Originally Posted by Rogalewski View Post
    Thanks everyone for the responses.

    Confirmed that it is wired up in phase. Switched it to a different channel and it sounds the same.

    I changed the Center Channel to small and it seems to have made some difference. These are the settings as I have them now. Does anyone see something jump out at them that could be causing a problem?

    Front L & R -3.0db, Center -4.0db, Subwoofer -11.0db,
    Crossover Frequency: Front/Surround 80Hz, Center 60Hz
    Subwoofer Mode LFE+Main
    LPF for LFE 120Hz

    Thanks again!
    My $0.02:

    I have a couple of things here. First lower the volume level of your sub (on your sub) and rerun audyssey and try to get the level within the +5 to -5 region

    Crossover frequency is fine.

    Submode should be LFE only

    Make your lowpass filter lower say 40-60 htz. You need to know the rolloff of your speakers and then set this. For example of your -3db rolloff of the csia6 is 50hz then set the lowpass filter at 60. The A9's can handle lower than that.

    When I did the above all my midbase and base sounded amazingly better and was not flabby and muddy. It was nice and tyte like a tiger!
    Last edited by chiptouz; 09-05-2013 at 06:42 PM.
    Sharp LC-80uq17u
    Denon 3808ci Receiver
    OPPO BDP-93 Blu-Ray Disc Player
    Monster HTS 3600
    Polk RTi-a7 (fronts)
    Polk CSi-a6 (Center)
    Polk TC-60i (Rear & Surround Rear)
    HSU Research VTF3-MK4 (Sub)
    Logitech Harmony 900 (Remote)

  12. #12

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    Quote Originally Posted by jbooker82 View Post
    I would set the center to 80hz if your going to be running your towers that high. Your center channel shouldn't really be set to a lower frequency than the the towers.

    Right now I have the following set.

    Front RTi A7's - Full Range
    Center RTi A4 60hz
    Surround FXi A4 60hz

    LFE 120hz
    Subwoofer No

    I do have a sub that I turn on for movies and video games but for general TV watching I just run my RTi A7's at full range.
    This is very similar to my setup, but I have the sub on and LFE is much lower, say 40 or 60hz.
    Sharp LC-80uq17u
    Denon 3808ci Receiver
    OPPO BDP-93 Blu-Ray Disc Player
    Monster HTS 3600
    Polk RTi-a7 (fronts)
    Polk CSi-a6 (Center)
    Polk TC-60i (Rear & Surround Rear)
    HSU Research VTF3-MK4 (Sub)
    Logitech Harmony 900 (Remote)

  13. #13

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    Quote Originally Posted by chiptouz View Post
    This is very similar to my setup, but I have the sub on and LFE is much lower, say 40 or 60hz.
    Yea but the setting for LFE is a low pass filter not a XO. The LFE is a separate sound track in an audio source with a x.1. Since its a low pass filter it will not re route LFE sound above your setting to the mains. You simply create a hole.

    The guys at Audyssey say to leave it at 120hz.
    https://audyssey.zendesk.com/entries/321931-LPF-on-LFE
    AVR: Onkyo Tx-NR808
    Amplifier: Carver A-753x 250 watts x 3
    Fronts: Polk RTI A7 (modded by Trey VR3)
    Center: CSI A4 (modded by Trey VR3)
    Rear: FXI A4
    Sub: Polk DSW Pro 660wi
    TV: LG Infinia 50PX950 3D
    Speaker Cable: AudioQuest Type 8
    IC: AudioQuest Black Mamba II

  14. #14

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    Quote Originally Posted by jbooker82 View Post
    Yea but the setting for LFE is a low pass filter not a XO. The LFE is a separate sound track in an audio source with a x.1. Since its a low pass filter it will not re route LFE sound above your setting to the mains. You simply create a hole.

    The guys at Audyssey say to leave it at 120hz.
    https://audyssey.zendesk.com/entries/321931-LPF-on-LFE
    I understand what the guys at odyssey have stated. Believe me I have ran mine for a long time at 120 hrz. For me the whole systems sounded much better when I switched it over to a much lower frequency. If 120 was the end all be all why would they give you the option to lower it?

    The whole argument I am making is that you need to listen to it yourself and see what works best. That is all.

    Chip
    Sharp LC-80uq17u
    Denon 3808ci Receiver
    OPPO BDP-93 Blu-Ray Disc Player
    Monster HTS 3600
    Polk RTi-a7 (fronts)
    Polk CSi-a6 (Center)
    Polk TC-60i (Rear & Surround Rear)
    HSU Research VTF3-MK4 (Sub)
    Logitech Harmony 900 (Remote)

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