Bi-Amping Paradigm Studio 100

Discussion in 'Archived Threads 2001-2004' started by Daniel Mai, Jan 22, 2003.

  1. Daniel Mai

    Daniel Mai Stunt Coordinator

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    I have a Rotel RSP-1066 with RMB-1075 (120W or 130W X 5) for my Studio 100, CC and ADP.

    Is it worth it to Bi-amp the 100s and add a smaller amp for the rear? What differences will I expect to hear? Do I need any crossovers or will I any kind of calibration for the woofer to match with mids and highs?

    Thanks!
     
  2. Chas_T

    Chas_T Supporting Actor

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    Daniel,

    I have a similar setup you are describing with bi-amping the 100's and then a smaller amp for the rears.

    Initally, I had a receiver on the 100's and it was not a good fit at all. The Sony 777ES was at 105 watts or something like that and the 100's needed something to drive them with more power to make them shine.

    Then I bought a Sherbourn 5/1500A 200 Per and used two channels each for biamping both speakers. The excess channel I use for the center. For the rears, a Modial 8002 125 per channel for the rears.

    The reproduction after making the change was rather striking to say the least. The 100's are noted for their need of power to drive them. If you do a search on here, there is a wealth of information about this speaker from Paradigm.

    As far as external crossovers, I would default to someone with more expertise then I. I've heard where they can be an asset. My thoughts are that with a good pre-pro, you should be able to set yourself up with a nice sounding system.

    Hope this helps.
    Charles
     
  3. Michael R Price

    Michael R Price Screenwriter

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    Charles, how did you set up the bi-amp system? Is the signal just split into the two amplifier inputs? Or do you have an active crossover of some sort? I'm just trying to find out if anyone can describe the difference in sound between passive and active bi-amping.
     
  4. Chas_T

    Chas_T Supporting Actor

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  5. Mark Russ

    Mark Russ Second Unit

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    Don't mean to hijack this thread, but does anyone KNOW FOR CERTIAN that if you do passively biamp (by removing the jumper straps between the speaker binding posts), that if this will actually change the ohm load of the speaker to the respective amps that they are hooked up to?
     
  6. Daniel Mai

    Daniel Mai Stunt Coordinator

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    Hi Charles,

    Thanks for your input and for the links. Right after my post, I got extremely busy at work and haven't been able to check in or look into anything. I did find out that I have passive internal crossover. I hope to have tomorrow or this weekend since this option does sound appealing or should I say dynamic.

    Mark,

    Hijack away!! The more questions ask, hopefully we get more answers or inputs.
     
  7. Michael R Price

    Michael R Price Screenwriter

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    Thanks for the links Charles. I really shouldn't bother asking since I plan to passive bi-amp, then get an active crossover and see what happens anyway.

    Mark, passive bi-amping changes the load your amplifiers see to whatever nominal load they were before, except split by the crossover. For example, hooking an amplifier to only the LF section of my speakers presents the amplifier with a 4 ohm nominal load that increases rapidly above 2KHz. (Likewise, the HF section is 4 ohms but that increases below about 2KHz). Some speakers' LF and HF sections have different nominal impedances (example: 4 ohm pair of woofers plus 8 ohm tweeter without zobel). So passively bi-amping reduces the current draw at the frequencies that are filtered out by the crossover. You can put a low powered amp on your tweeter and it will have less distortion because it will not have to deliver significant current at lower frequencies. Likewise, there are less intermodulation distortions caused by higher frequencies interfering with the LF amp output.

    So Charles, what differences in sound did you notice between using a single good amplifier, versus passive bi-amping?

    In my case at the moment I have one cheap amplifier and one really good amplifier. Passive bi-amping enabled my system to play louder with less distortion, but otherwise degraded the sound over that of the single high-quality amplifier. I hope to soon bi-amp using two worthy amplifiers.
     
  8. Mark Russ

    Mark Russ Second Unit

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    Thanks Michael. So, in layman's terms, if I were to passively biamp, for example, say a Polk LSi15 (which is originally rated at 4 ohms), by removing the jumper straps between the 2 sets of speaker binding posts and hooking up 2 power amps (1 for highs/mids, the other for bass), then both power amps will still see a 4 ohm load then?.
     
  9. Michael R Price

    Michael R Price Screenwriter

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    Exactly... same nominal impedance, just only in the frequencies they are driving. So bi-amping this way will reduce distortion caused by stress on your amp due to difficult impedance, especially with the HF amp not producing bass.
     
  10. Daniel Mai

    Daniel Mai Stunt Coordinator

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    But I only have 1 pair of stereo output. Now what do I need to do? If I split the signal with a Y, will I degrade the signal?
     
  11. Chas_T

    Chas_T Supporting Actor

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    Michael:

     

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