SVS 20-39CS

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  • EndersShadow
    EndersShadow Posts: 17,687
    Is this with or without that SVS rossover box? Maybe try it without, being careful to not play any test tones below 20hz lol...

    See if that helps as it could be that box. Have you tried different interconnects to see if Thor change anything? Have you tried the other channel of the amp?

    Lots of variables to check.
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • Airplay355
    Airplay355 Posts: 4,298
    I took the driver out of the enclosure. I was worried the enclosure might have an air leak that was making noise but there's still some sound coming from the driver itself.

    This is with the subsonic filter. I'll remove it and see what happens. I've swapped out interconnects and used a single channel of the amp, bridged and it did this before with the monoblock but I attributed it to clipping from an underpowered amp. The Crown has clipping lights on it and occasionally the -20db light pops on during a loud scene but that's it.
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  • Airplay355
    Airplay355 Posts: 4,298
    You sir are a genius. I unplugged the box and the problem is gone. The overall volume is much less now so would that suggest it has something to do with the gain knob on the SVS box? I had it all the way up but maybe that was a poor choice. There are so many volume controls for the one speaker I'm not sure what should be what.

    I've got the preamp level, gain on the SVS box and gain on the amp. Should be using something like 75% on the box and amp and use the preamp to adjust the level?
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  • EndersShadow
    EndersShadow Posts: 17,687
    edited August 2017
    So you've got the Crown XLS1502 right? There should be a .775 and 1.4 VRMS setting on the amps menu...

    Make sure your at .775. 1.4 is the default (you will find that making it .775 CHANGES THE GAME FOR YOU)....

    Then put the gain on the Crown wide open, then adjust the SVS box to maybe 25 - 50% (make sure its not making a noise). Personally I'd start with it @ 25% and adjust up as you feel comfortable, paying attention to the driver to make sure its not making any noise :smile:.

    That input sensitivity change on the Crown will really make a big difference IMHO.

    Then adjust your pre-amp... I forget, what IS your pre-amp?
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • Airplay355
    Airplay355 Posts: 4,298
    Thanks very much!

    I had the .775v sensitivity setting on already. It looks like I had my gains all backwards though. I had the svs box maxed, the preamp (outlaw 975) at -3 for LFE and the crown at half.

    I'll try out the new way tonight and see how it sounds.
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  • EndersShadow
    EndersShadow Posts: 17,687
    Airplay355 wrote: »
    Thanks very much!

    I had the .775v sensitivity setting on already. It looks like I had my gains all backwards though. I had the svs box maxed, the preamp (outlaw 975) at -3 for LFE and the crown at half.

    I'll try out the new way tonight and see how it sounds.

    Yes. If you want to be slow with things, put the Crown at 50%, the Outlaw at -3, and the SVS at 25. Then turn up the Crown till it maxed, or your happy with things

    Your setup is a bit wonky in that you have 3 gain adjustments, but thats also just 2 up from a normal setup, so not that big a deal.

    As a FYI with my dual sealed subs, XT32 wanted my Crown gain @ 1/2 to run EQ.... It then set things @ negative numbers (forget what they are) after calibration.

    I left those numbers there, but adjusted the gain up.

    Just be careful and maybe put that subsonic filter at 20 to start with and get your settings dialed in. Then after a few days making sure your not hearing anything bad, adjust it to the 17hz one if you want.

    I'm just concerned with how much wattage the Crown can give that sub that you might send it too much and blow it....
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • Airplay355
    Airplay355 Posts: 4,298
    Ok I messed with some things and settled on these settings for now...Crown wide open, LFE @ preamp on -6db, SVS box at...2 of 8 haahaa. The sub definitely sounds better - deeper, louder, better integrated with the rest of the system. Occasionally I can notice some noise from that corner but it's difficult to tell of it's the walls, windows etc vibrating. Either way, it's definitely improved from before.

    I haven't gotten a chance to mess with test tones yet - gotta do that when the wife isn't around. Were watching fantastic beasts right now and so far no complaints.

    What exactly is that box doing that had things so messed up when turned up? I assumed it would only attenuate a signal and was meant to give you an easy way to turn it down. Clearly that's not the case, right?
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  • Airplay355
    Airplay355 Posts: 4,298
    Are the test tone videos on youtube a bunch of compressed BS?
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  • EndersShadow
    EndersShadow Posts: 17,687
    Airplay355 wrote: »
    Are the test tone videos on youtube a bunch of compressed BS?

    Here ya go: http://realtraps.com/test-cd.htm
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • Airplay355
    Airplay355 Posts: 4,298
    Thanks man! You've been invaluable to fixing my issues with this sub. I think I've managed to get them all pinned down so far. They were...

    1) Old internal wiring that may have been bouncing around against the driver (and had also turned completely green throughout).

    2) Screwed up gain settings sending distortion to the driver.

    3) A cabinet air leak around the screws that hold in the base and binding posts.

    I couldn't hear the air leaks well during movies but using the test tones they're easier to spot. I used some weather stripping to seal things up a little better. There's still a tiny bit of noise around the binding posts in the 20-25hz region but it's quiet enough now that I shouldn't be able to tell during a movie.

    I think I've gotten rid of all the gremlins for now. I managed to play the 20-29hz test tone louder than I cared to listen to it. What an ordeal this has been B)
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  • EndersShadow
    EndersShadow Posts: 17,687
    Welcome to the BASS club :smile:

    Now play Blowout by Crystal Method and giggle like a schoolgirl
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • sgmsmg
    sgmsmg Posts: 556
    If you are still looking for something to treat the surround on your driver you may want to look into 303 Aerospace Protectant. Definitely a better idea than Armor All. It won't leave a greasy residue either. Sometimes you can find single application samples on-line.
    2 Channel
    Pre: Bryston BR20
    Amp: Buckeye NCx500
    Speakers: Polk L200
    Source: Oppo UDP-205, Bryston BDP-3, Bryston BCD-3, Apple TV, Amazon Fire
    Cables: Wireworld Gold Eclipse 7 Speaker, Wireworld Gold Eclipse 7 XLR, AQ Diamond USB/HDMI
    Power: PS Audio P10 Regenerator, AC12, AC10 and AC5 Cables
    Display: Sony XBR65Z9F

    Home Theater
    Pre: Anthem AVM90
    Amps: Buckeye NC502
    Speakers: Polk LSiM 707 (FL/FR), Polk LSiM706 (Center), LSiM 703 (SL/SR/SBL/SBR), Polk 900-LS (Atmos)
    Subwoofers: SVS SB16 x 4
    Source: Oppo UDP-205, Apple TV, Amazon Fire
    Cables: AQ Meteor/Rocket 88, AQ Niagara/Sky
    Power: Torus AVR20, Shunyata Denali, Shunyata Delta, Cullen, PangeaAC9SE Cables
    Display: Sony XBR85Z9G
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  • Airplay355
    Airplay355 Posts: 4,298
    Thanks! I might grab some of that the next time I order from Amazon. I was going to put purified mineral oil on it but if I'm wrong about the surround being nitrile and it's butyl, I'll wreck it. So I've waited haha
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  • Airplay355
    Airplay355 Posts: 4,298
    edited September 2017
    Ok, now that I've got things all fixed I feel like I've got more output than I'll need. I've usually got things turned down.

    What would happen if I plugged port(s)? Is that possible with this sub? How would I experiment with it?
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  • VR3
    VR3 Posts: 29,392
    That's a bad **** subwoofer. My Dad had the powered version in a 1500 sq Ft room and it could shake the windows with some nice clean bass.

    I would leave the surround alone, it's fine.

    I believe that driver was made by TC Sounds before SVS started making their own
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • Airplay355
    Airplay355 Posts: 4,298
    Thanks man! Yea it's a monster, more than I needed for sure but it was so cheap :)
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  • EndersShadow
    EndersShadow Posts: 17,687
    You can always turn it down... you cant always turn it up :smile:

    Glad you got it all figured out and are loving the stuffing out of it.
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • Airplay355
    Airplay355 Posts: 4,298
    @EndersShadow what do you think about plugging some of the ports? Can I stuff one or two with a towel to see what happens or is that a bad idea?
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  • EndersShadow
    EndersShadow Posts: 17,687
    You could. I'd also contact SVS to see if they can sell you some foam plugs for giggles, but a towel will work ok.

    Your gonna want to try and find the manual to figure out what tune plugging a single or dual port results in.
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • Airplay355
    Airplay355 Posts: 4,298
    I got a PDF manual from SVS but there's no mention of port tuning. I asked their CS department about port plugging before but didn't get an answer. It's such an old product the guy I e-mailed may not have known about it.

    I assumed since it was tuned to 20hz with all ports open because of the name but I'm not sure what the "39" in the name would correspond to then.

    Could I accidentally hurt anything or will I be fine as long as I don't crank the knob off?
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  • EndersShadow
    EndersShadow Posts: 17,687
    Shouldn't be able to hurt anything I think
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • Airplay355
    Airplay355 Posts: 4,298
    Sweet, thanks!

    I'll try it out and report back >:)
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  • Airplay355
    Airplay355 Posts: 4,298
    There's some sort of missing post here :D
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