Need help with 20-39CS

Discussion in 'Archived Threads 2001-2004' started by Conrad_S, Jan 24, 2002.

  1. Conrad_S

    Conrad_S Stunt Coordinator

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    I'm getting a signal on it, but it is far from the performance I'd expect from it. I've double checked all my wiring, and it looks fine. The Polk PSW450 at half-gain sitting in my room plays substantially louder than the SVS maxed.

    Here's the setup:

    Onkyo TX-DS494

    to

    RCA cable running from sub pre-out

    to

    RCA/.25" mono converter

    to

    Channel 1 on Samson S700 (stereo mode)

    to

    ~ 10 ft. 16 gauge Home Depot speaker wire

    to

    20-39CS (sitting in a corner)

    The room is 12'x14'.

    TIA for any help/suggestions!
     
  2. Tom Vodhanel

    Tom Vodhanel Cinematographer

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    Have you turned the front gain control on the S700 to max?

    TV
     
  3. Conrad_S

    Conrad_S Stunt Coordinator

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    Yes, it's maxed out, but still relatively "quiet". I have to set my receiver's subwoofer level to +12db for the SVS to come close to the Polk at half gain with +2db.
     
  4. Tom Vodhanel

    Tom Vodhanel Cinematographer

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    Are you calibrating with a SPL meter during all this?

    How large is the room and how far from the SV are you sitting during calibration?

    TV
     
  5. Conrad_S

    Conrad_S Stunt Coordinator

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    No, I have not even started calibrating... At any given volume/setting, the SVS *should* be louder than the PSW450 at the same level, right?

    The room is 12'x14'. *Correction from up top, I'm running 12 gauge to the sub from the Samson.
     
  6. Conrad_S

    Conrad_S Stunt Coordinator

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    I've been going over my components, and perhaps this may be it: (excuse me if I sound like a newbie [​IMG])
    I'm using a "regular" RCA cable rather than a RCA patch cable. Would this make a difference?
    Here's a link to what I'm using:
    http://www.radioshack.com/product.as...5Fid=15%2D1539
     
  7. ColinM

    ColinM Cinematographer

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    That shouldn't be enough to attenuate the signal THAT much.

    Make sure there's no compression on.

    Make sure all speakers are set to small.

    Good sub, I have one on 165 watts and there's no comparison to the old box 10" I was using.

    Good Luck!

    - CM
     
  8. Conrad_S

    Conrad_S Stunt Coordinator

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    The receiver has no compression feature, nor does it have the ability to set the regular speakers as small/large. Only the sub can be set to large/small (Mode1/Mode2 in the Onkyo manual).

    It's really weird that this is happening to me, since my brother experienced the same thing when he tested an Ultra. He used completely different equipment, in a different room, on a different circuit. Yet the Ultra experienced similar "attenuation". (Only similarities we shared between the two setups are Home Depot 12 gauge wire and the same apartment.)
     
  9. ColinM

    ColinM Cinematographer

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    What kind of 1/4"adapter are you using? Stereo or mono?

    Should be mono...

    Otherwise I'm stumped.

    - CM
     
  10. JohnnyHK

    JohnnyHK Stunt Coordinator

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    Are you sure it's not just a lack of "boominess" that you're (not) hearing?
     
  11. Conrad_S

    Conrad_S Stunt Coordinator

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  12. Conrad_S

    Conrad_S Stunt Coordinator

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    I'm positive it's not boominess. The SVS is just not louder in anyway than the Polk I have in the same room. The Polk has more air movement and is louder - I can't max out the volume on the receiver otherwise I'll get noise complaints.

    The SVS is maxed at +12db on the receiver, I have the amp maxed, and I can turn my receiver to full volume. The SVS just starts reaching my normal listening level for the Polk.

    From everything I've read in these forums, there is no way I should be able to max out the 20-39CS and not be evicted in a few hours... :p
     
  13. ColinM

    ColinM Cinematographer

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    And when you swap in the Polk, the bass is back?
     
  14. Conrad_S

    Conrad_S Stunt Coordinator

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    That's what I was saying above, I set the Receiver at 0db for the sub. Turn the dial all the way up on the Samson, and the SVS is pretty much quiet.

    I turn off the Samson, unplug the RCA for it from the Sub Pre-Out. Then plug in the RCA for the Polk, which is set at half-gain otherwise it distorts :p. I notice a 2-3x increase in the loudness.
     
  15. ColinM

    ColinM Cinematographer

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    Sorry, we were posting at the same time.

    Is there a voltage switch on the Sam's power supply? Switched to 220 / 240?

    Ohm switch? I haven't seen the back panel of the Sam before, sorry...
     
  16. Conrad_S

    Conrad_S Stunt Coordinator

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    Here's a link to the user manual/tech sheet on the S700:
    http://www.samsontech.com/audio/sa700.html
    Pretty simple amp, only switches I see are for the Bridged/Stereo/Parallel modes and to reset the 15 amp fuse. The tech sheet has a pic of the back of the unit on the first page.
     
  17. ColinM

    ColinM Cinematographer

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    If you are daring, try pulling the polk driver and amp the SV with the polk amp...

    Otherwise I'd need to get my hands on it to figure this out.

    Good Luck, man. I love my SV. I hope it works for you.
     
  18. Tom Vodhanel

    Tom Vodhanel Cinematographer

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    1)Try using the channel #2 input on the S700.

    2)try a different adaptor

    3)try reversing the phase on the SV

    4) make sure all the cables/adaptors are firmly seated.

    5) the onkyo DD receiver should have a menu to set speakers to large/small...subwoofer to yes/no.

    calibrate the SV with a polk off...and post the details on the settings you had to use,and the SPL meter readings... this alone will help us pinpoint the problem much faster,

    TV
     
  19. Conrad_S

    Conrad_S Stunt Coordinator

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    It's late here now, so I'll run through that list after I get back from school tomorrow. I ordered AVIA tonight, so hopefully I'll be able to run the calibration test early next week.
     
  20. Conrad_S

    Conrad_S Stunt Coordinator

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    Had an idea at school, and I wanted to try maxing out the SVS. So, when I got home, I set all the speakers at -12db and the subwoofer at +12db on the Onkyo. Then turned the volume up to 60 of 80... And voila! The SVS was performing at about an awe inspiring 2-3x the level of the Polk. (With distortion, but the +12db was probably the cause)
    Now the question is, how can I get that peformance without having to max the settings out like that? Would something like this do it?
    http://www.partsexpress.com/pe/showd..._ID=5641&DID=7
     

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