200Hz for SVS?

Discussion in 'Archived Threads 2001-2004' started by Steve Stogel, Jan 16, 2002.

  1. Steve Stogel

    Steve Stogel Supporting Actor

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    Looks like I'm either going to have to get another amp for the used SVS I just bought from Houston [​IMG] (won't be able to pick it up for at least 1-1/2 weeks, though [​IMG]) or run the SVS up to 200Hz. My sub amp only has speaker level inputs, so I've got to use the amp's internal crossover (200Hz [​IMG]). My receiver does have A/B speaker level outs, so I could run one set to the mains (thus giving them the full bandwidth) and one to the amp, or I could just use the amp's speaker level outs to the mains and have them just get 200Hz and up.
    While 20-200Hz going to the sub is far from ideal, my main concern (until I get a good 300W+ amp) is how bad this is for the sub (performance-wise, but more importantly if it would somehow damage the woofer...I think not, but I'm far from an expert). So what's the verdict (Tom, Ron, or anyone who has input [​IMG]).
    Steve
     
  2. Craig Woodhall

    Craig Woodhall Supporting Actor

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    it would be pretty localizable (is that a word)... 80hz (or even lower) is much better!
     
  3. Tom Vodhanel

    Tom Vodhanel Cinematographer

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    You won't hurt the subwoofer, but it's definitely far from ideal system performance wise.

    Until you can upgrade the XO issue...try to keep the subwoofer near the front speakers. If you can run the mains full range...you could also get a *F-mod* to LP the subwoofer around 60-100hz. $29 from harrisonlabs.

    TV
     
  4. Steve Stogel

    Steve Stogel Supporting Actor

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    Mr. Vodhanel, you never fail to amaze me. I've never even heard of these things. Yes, I could send full range to my speakers, and that's a relatively inexpensive fix (can't beat $30).
    Let me start by apologizing for the length of this post. It is directed mainly to Tom, but if anybody has the courage to try to make it through the post and has any input, I would be more than happy to hear from you. Well, on with the rambling...
    The F-mod looks to be a nice (cheap) fix to my crossover problem, but I may have stumbled on my own solution. Tell me what you think. RatShack sells a "mini stereo amplifier" (http://support.tandy.com/support_audio/8411.htm). It's got three audio inputs and two speaker level outs (phono jacks, not springs). It pushes an amazing 1.8W per channel (that's over 3 1/2 watts total!!!).
    Here's the plan. I hook the sub out line level from my receiver into (pick one) the CD input of the "amp" (left audio input, I guess). Then I use the speaker level out (the left out only), using that annoying speaker wire from RatShack that has phono on one end and regular speaker wire on the other, to go to my sub amp (which only has speaker level inputs). Then I go from my sub amp to the SVS (catch here is that the sub amp has left/right inputs, left/right outs to the sub, and left/right outs to the speaks).
    So, does this basically do the job of converting line level to speaker level to go into my sub amp? I can't see the problem with the convertion, but will I only get half the juice of the sub amp (rated at 150W into 4 ohms) since I'm only using the left speaker out to the subwoofer? I considered splitting the line level so I could use both the L/R inputs to the "amp" and then both the speaker outs to the sub amp, but then I'd have to send both the left and right speaker level outs to the same speaker level inputs on the SVS. I have no idea, however, what that might do to the sub amp's impedence, so that concerns me.
    I think I'm just about done rambling. So, of the two options (mini stereo amp vs. the F-mod), which is the best way to go? The mini "amp" sells for $60 at the Shack, but I saw it on Ebay, and it went for in the range of 30-40 bucks. Any opinions would be appreciated, and I promise I'm just about done asking annoying questions about this. Thanks.
    Steve
     
  5. Steve Stogel

    Steve Stogel Supporting Actor

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    bump (I put this meaning I wanted it to go back up near the top so Tom would get a chance to read it. Is that why people put "bump"? If not, I used it incorrectly :b)

    Steve
     
  6. RichardH

    RichardH Supporting Actor

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    Not sure what TV will say, but here's my advice:

    Just get the $79 KLH receiver from Best Buy and an FMOD filter if you want it.

    The whole converting line-level to speaker-level just so you can feed it into an amp seems like a bad idea.

    Better yet, see if you can find someone's used Pro Logic or stereo receiver they don't need anymore.
     
  7. Tom Vodhanel

    Tom Vodhanel Cinematographer

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    >>>Mr. Vodhanel, you never fail to amaze me. I've never even heard of these things. Yes, I could send full range to my speakers, and that's a relatively inexpensive fix (can't beat $30). Let me start by apologizing for the length of this post. It is directed mainly to Tom, but if anybody has the courage to try to make it through the post and has any input, I would be more than happy to hear from you. Well, on with the rambling...>The F-mod looks to be a nice (cheap) fix to my crossover problem, but I may have stumbled on my own solution. Tell me what you think. RatShack sells a "mini stereo amplifier" (http://support.tandy.com/support_audio/8411.htm). It's got three audio inputs and two speaker level outs (phono jacks, not springs). It pushes an amazing 1.8W per channel (that's over 3 1/2 watts total!!!). Here's the plan. I hook the sub out line level from my receiver into (pick one) the CD input of the "amp" (left audio input, I guess). Then I use the speaker level out (the left out only), using that annoying speaker wire from RatShack that has phono on one end and regular speaker wire on the other, to go to my sub amp (which only has speaker level inputs). Then I go from my sub amp to the SVS (catch here is that the sub amp has left/right inputs, left/right outs to the sub, and left/right outs to the speaks). So, does this basically do the job of converting line level to speaker level to go into my sub amp? I can't see the problem with the convertion, but will I only get half the juice of the sub amp (rated at 150W into 4 ohms) since I'm only using the left speaker out to the subwoofer? I considered splitting the line level so I could use both the L/R inputs to the "amp" and then both the speaker outs to the sub amp, but then I'd have to send both the left and right speaker level outs to the same speaker level inputs on the SVS. I have no idea, however, what that might do to the sub amp's impedence, so that concerns me.
     

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