OPINIONS! Blowing fuses on my SVS 20-39+

Discussion in 'Speakers' started by Gene Evans, Jan 12, 2004.

  1. Gene Evans

    Gene Evans Auditioning

    Joined:
    Jan 4, 2004
    Messages:
    8
    Likes Received:
    0
    Got it today. While calibrating with an Avia DVD...when it runs through its frequency sweep down to 20hz...if I have the volume up 1/2 way on my receiver and 1/2 way up on the sub, it WILL blow the fuse. Without fail.

    I have it tuned down to 16hz.

    Crossover frequency is disabled.

    My receiver is a Yamaha RX-V795A.

    No problems as such thus far with movies, music.

    Is this normal?

    I tried contacting SVS...but they're sales staff is off to the CES per their recording.

    Looking for opinions.

    Otherwise, this thing is unbelieveable.
     
  2. Robb Roy

    Robb Roy Supporting Actor

    Joined:
    Jul 15, 2002
    Messages:
    711
    Likes Received:
    0
    Gene,

    Have you tried emailing them? They've been on email despite the CES trip and may know what's going on quickly.

    -Robb
     
  3. Tom Vodhanel

    Tom Vodhanel Cinematographer

    Joined:
    Sep 4, 1998
    Messages:
    2,215
    Likes Received:
    8
    Hi Gene,

    Yes, that is normal. Based on the control settings you described, I'm betting the subwoofer is producing 115-120dBs when the fuse pops. You should never play test tones that loud. Although sweeps are less stressful than say a sinewave...you can still damage the subwoofer at extreme levels. Please calibrate the system with a SPL meter, and pop in a few DVDs or CDs and let me know how it sounds..[​IMG] Also, don't forget to experiment a bit with the phase control and placement of the subwoofer in the room too(corners tend to work well).

    Tom V.
    SVS
     
  4. Ronneil Camara

    Ronneil Camara Stunt Coordinator

    Joined:
    Dec 2, 2002
    Messages:
    235
    Likes Received:
    0
    Hey guys,

    I am still in the deciding stage. But I'm leaning towards getting an SVS sub. Though lately, I have seen some post regarding fuse issues with SVS. I know how the SVS guys takes care of their customers based from threads I've read from the forum. One question though, does this issue always happen?

    Thanks in advance.

    neil
     
  5. Tom Vodhanel

    Tom Vodhanel Cinematographer

    Joined:
    Sep 4, 1998
    Messages:
    2,215
    Likes Received:
    8
    Hello Neil,

    The fuse is supposed to blow in certain situations(that is actually exactly why is it a part of the amplification circuitry). Running test tones at very loud levels?. Well, the fuse BETTER blow...if it doesn't (when it should)...you likely be left with a subwoofer that no longer *woofs*..[​IMG]

    Match the correct subwoofer to your listening needs and room size, calibrate the system...and you'll likely never pop the fuse.

    Tom V.
    SVS
     
  6. ScottCarr

    ScottCarr Second Unit

    Joined:
    Jan 28, 2003
    Messages:
    459
    Likes Received:
    0
    Neil,

    I have to ask as a frequent visitor to many of these forums, Is there a rash of SVS fuse blowing going on. I honestly can only recall one.

    thanks
    Scott
     
  7. Ronneil Camara

    Ronneil Camara Stunt Coordinator

    Joined:
    Dec 2, 2002
    Messages:
    235
    Likes Received:
    0
    Hi scott,

    I just saw 2 threads related to it today and the other day. But forget it, probably, the fuse blows up because users are forcing it beyond its normal limits. And just told my self that having a fuse is a good feature.

    Thanks.

    neil
     
  8. James W. Johnson

    James W. Johnson Screenwriter

    Joined:
    May 26, 2001
    Messages:
    1,055
    Likes Received:
    0



    I wonder what percentage of your customer's blown drivers are because of the above? [​IMG]
     
  9. jeff_coil

    jeff_coil Stunt Coordinator

    Joined:
    Dec 3, 2002
    Messages:
    157
    Likes Received:
    0
    I have never blown a fuse in over a year with my 20-39pc+
     
  10. Edward J M

    Edward J M Cinematographer

    Joined:
    Sep 22, 2002
    Messages:
    2,031
    Likes Received:
    0
    The only other time I have ever read about a blown fuse on an SVS amp was recently with a PB1-ISD, and that unit was more than likely damaged by UPS in transit. The Indigo BASH amps SVS uses are extraordinarily reliable and rugged.

    I've owned two powered SV subwoofers, and helped set-up and calibrate several others. None of us have ever had a problem with a blown fuse. This is definitely a result of pushing the sub too hard on sine waves or sweeps, and it's a safety feature designed to protect the amp/woofer.

    My only other suggestion to Gene would be to try the stock 20 Hz tune. Running the PC+ with a port plugged makes it work a bit harder (more current draw, higher VC temp, etc.) to achieve a given sound pressure level.

    The 20-39PC+ will dig strong to about 17-18 Hz in the native tune - plenty deep for nearly all DVDs and music. I would only use the 16 Hz tune if I knew for sure there was strong signal content in the 14-17 Hz region. Otherwise, let the "triple threat" breathe deep. [​IMG]
     
  11. Ron Stimpson

    Ron Stimpson Stunt Coordinator

    Joined:
    Jul 19, 1998
    Messages:
    199
    Likes Received:
    0
    Gene,

    Please keep us posted but I do believe all is well and the fuses are working correctly as we discussed via e-mail. Hopefully you were able to get an SPL meter and see where your real calibration is. As already noted, 1/2 up on gain and receiver sub level can be actually very VERY high in reality, potentially 2-3 times recommended levels (ergo the blown fuses) for test tones as Tom indicated.

    PS, as you already know both sales and tech support was fully functional at CES, we did announce our presense there on the voice mail just in case we did not pick up. It can get pretty noisy at CES and wanted to warn folks of that is all.

    Ron
     
  12. Dave Shepard

    Dave Shepard Agent

    Joined:
    Sep 30, 2003
    Messages:
    39
    Likes Received:
    0
    I did the freq. sweep with the sub too loud one time and stopped the sweep before it was done, the sonics were just too much and every room in the house was shaking, I almost couldn't see straight I felt my eyes starting to shake. I couldn't imagin what was going on in your house.

    Dave
     
  13. Keith Hyde

    Keith Hyde Stunt Coordinator

    Joined:
    Dec 28, 2003
    Messages:
    106
    Likes Received:
    0


    I just ordered my Avia disc. The SVS PB2+ is on the way. And I'm reading stuff like this. The investment was the easy part - the waiting is killing me. Sigh.
     

Share This Page