How come I can't bottom my subs

Discussion in 'Archived Threads 2001-2004' started by Greg Br, Mar 19, 2002.

  1. Greg Br

    Greg Br Second Unit

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    Well its been a couple of weeks since I added the Samson amp to my Dual SVS 20-39cs with the Improved driver and no matter what I do I have never heard a "clack". I see the amp clipping hard but hear no clack. I assume since I am not hearing it bottom, if there is no distortion I could keep pushing these subs to see what they can do. I was reference +5 db's and I had no problems on TPM THX. Maybe these new drivers are extremely hard to bottom.
     
  2. GabrielC

    GabrielC Stunt Coordinator

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  3. ColinM

    ColinM Cinematographer

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    Describe that experience for me....
     
  4. Greg Br

    Greg Br Second Unit

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    Thats a tough one, for starters TPM Intro, the ball exploding is picture knocking but the sweep down never did alot for me but last night when I was +5 I could really FEEL some good stuff at the very end.

    The best intro for me is the T2 THX intro, when I played that my wifes eyes got real big and my daughter whent running for a different room. Visualy think of Close Encounters of the Third Kind, when the ships come around and it looks like all hell is breaking loose, ok well maybe thats a stretch, at least till I get a couple of SS'S in th room.
     
  5. Greg Br

    Greg Br Second Unit

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    Colin, I thought I posted alot but 599 posts and you have only been logged 4 days longer than me, congrats on a quick 600!
     
  6. ColinM

    ColinM Cinematographer

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    Boring desk job

    HT obsession

    I look for questions with zero replies, I like to help.

    If I don't know WTF is going on, I shut up. 600!!! WOOOO!

    Thanks!
     
  7. Earl J

    Earl J Stunt Coordinator

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    Hey Greg, do you have the Gain all the way up on the amp? Have you calibrated your speakers? Just curious cuz that TPM THX intro does a number on my 2039CS (new driver on the way [​IMG])
     
  8. Craig_B

    Craig_B Agent

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    Greg,

    I had no problem bottoming mine, but I guess I was about 5 to 10db over reference with a new single 20-39cs and Samson S700 calibrated to the Denons internal test tones. Now that I have it calibrated to VE, it will just start to bottom at reference at the intro on Toy Story 2 when the name "Toy Story 2" comes on the screen. Is the TPM THX intro lower and louder than the Toy Story logo intro? I usually use the pod race as a demo, so I will have to try out the THX ball exploding. Can you get directly to it from the scene index?
     
  9. Greg Br

    Greg Br Second Unit

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    I have not tried Toy Story, and all the movie intros are on the new S&V Home Theater disk so that is where I get it from. Its a good thing that it does not bottom, I just want to make sure I am pushing them the way I should be.

    I have the Samson at -10dbs so its not quite full gain, this helps reduce the ground loop
     
  10. Dustin B

    Dustin B Producer

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    Figure out how to change titles on your DVD player. Then the THX intro is title 10. Bloopers are title 3.
     
  11. Dalton

    Dalton Screenwriter

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    Greg,

    I know this isn't topic related but i have seen some users that have only been here 2 months with over 1000 posts! BTW, i am installing my ISD's on my 25-31's right after i get off the computer. Can't wait to hear em!!
     
  12. JohnMW

    JohnMW Second Unit

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    Warning: The THX into on TPM will wreak havoc on your SVS. I have dual 20-39CS+'s w/ Samson 1000 (calibrated w/ AVIA @ 88db) and @ -10db on my 3802 I hear a "pop" when the ball explodes, and it doesn't sound very good when doing so.
     
  13. Greg Br

    Greg Br Second Unit

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    I have to be honest, I feel like I have alot of room still to push these. I am calibrated I am sure of that, I might really push these subs tonight and take some measurements as well, but if I can calibrate 5db's hot and then I am +10db's over reference and hear nothing then I am going to think that something is wrong.
     
  14. Troy_K

    Troy_K Stunt Coordinator

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    Greg,

    You may not believe me, but...

    I have the S&V disk, and I rented TPM this week. There is a difference between the 2 THX intros. My SVS will "pop" during the ball explosion on the TPM Disk, but I can push the S&V disk much higher (above reference like you stated) and it will not bottom out. I bottom at -12 on TPM.

    My sub is calibrated equally with all speakers - not hot!

    Go figure...

    Troy
     
  15. Greg Br

    Greg Br Second Unit

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    I agree, I am sure they know it is a sub killer. Its like the normal THX intro, depending on the DVD it sounds louder, for me the THX intro on T2 is by far the loudest. I have yet to bottom on anything yet, tomorrow I will have Toy Story 2, I am going to push it.
     
  16. Craig_B

    Craig_B Agent

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    Troy,

    I don't understand how you can be calibrated at 75 and then the sub will bottom at -12. Can you play any of the other bass heavy scenes at reference or will they all bottom the sub? I was having a similar problem and then I found that the internal test tones I had calibrated off of were not correct and I ended up lowering my sub by about 8 after using VE to calibrate.

    Craig
     
  17. VinhT

    VinhT Second Unit

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    The way you guys talk about bottoming-out due to high volume levels... I was under the impression that bottoming-out occurs when the frequency being played goes too far below the F3 of the sub. Could someone correct me on this?
     
  18. Troy_K

    Troy_K Stunt Coordinator

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    Craig,

    To my knowledge, I have not bottomed out on any other source material, and I play it very loud. I have reached 115 db easy when I watch TS2 for example.

    Troy
     
  19. Drew Bethel

    Drew Bethel Screenwriter

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    Ok, what is TPM?
     
  20. Dave Schofield

    Dave Schofield Second Unit

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    Star Wars: Episode 1 - The Phantom Menace
     

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