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new flatmate with surround speakers??

Discussion in 'AV Receivers & Amplifiers' started by Mannannan, May 9, 2003.

  1. Mannannan

    Mannannan
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    So.
    I was happily watching DVD through my playstation 2 and sony STR-DE585 in 5.1 etc. (JBL scs 10 speakers)
    Anyway, a friend is moving into the apartment with his own surround sound system: stand alone DVD player and a sound card, (dunno which ones).

    We wonder if I can hook up all ten speakers through my amp, and what should the settings then be?
    And would it be worth it?

    I was thinking to connect 2 speakers to each output on the amp. and to maybe set amp for large speakers if the combined wattage of the amps is high enough???
    The amps outputs 100W X 5
    Good idea or bad idea?

    Also thinking of placing one speaker high (ceiling corner) and one low (floor corner) and setting the speaker location settings on the amp to mid???
    Again is this a good idea or a bad idea?

    Also the amp only has one digital input, any suggestions for hooking up a playstation 2 and a DVD to one amp for best effect?
    Or is there such a thing as an "optical splitter"?

    Please don't let me ruin my gear before I get a projector!!!!!

    Cheers

    Johnny
     
  2. wookie

    wookie
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    If you must connect 10 speakers, wire them in series.
    If your speakers are wired in parallel, you may draw too much current and either "trip" your amp or damage its output stages/ speakers/ power supply etc etc.

    Series is amp + to sp + ,sp - to speaker +, sp - to amp -.

    Two 8 ohm speakers gives roughly 16ohms in series.
    Two 8 ohm speakers in parallel gives roughly 4ohms.
    """"4OHM""""""""""""in series """""""""8ohms
    """"4ohms"""""""""""in parallel"""""""""2ohms!!!!

    :hiya:
     
  3. mjn

    mjn
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    why would you want 10 speakers?
     
  4. alexs2

    alexs2
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    I think the results would be poor on many grounds.....

    using different makes of speakers with differing impedances etc.

    if you wire 8 ohm speakers in series to get a 16ohm load,the power output is going to be halved.
    if on the other hand you wire in parallel,as wookie points out,the resultant load may cause your amp to fry.

    Stick with what you have,as it already works!
     
  5. Mannannan

    Mannannan
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    Thanks Guys,

    I was pretty dubious about this anyway.
    The main reason to do this was to utilise everything we have, and maybe increase the surround sound effect.

    I really need to find out the ohms for the speakers before I go making posts like this, I suppose.

    My speakers are 50W each at the moment and I think the others will be 25W. In this case, am I right in thinking that the amp is in no danger?
    The surround sound has been satisfactory so far but not amazing, I keep the volume at less than 75% to avoid damaging the speakers, I was told in the shop that this would be fine and that the 100W X 5 amp would produce better sound even through 50W speakers than a 50W X 5 amp.

    Was I sold a pup?
     
  6. hornydragon

    hornydragon
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    no when you push an amp at 100% it often sounds harsh, you should never run one near 90% for long period the shop were probably right
     
  7. Mannannan

    Mannannan
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    Thanks there Hornydragon,

    But I was mostly worried about blowing a speaker as the Amp can output 100W and the speakers are 50W.

    Really have no interest in going "all the way to 11" anyway.

    But the rational from the shop was something like this:

    "100W will blow a 50W speaker,
    speaker should handle up to 50W,
    but, true output from amp will not be 100W even at 100% of volume
    therefore 75% of volume is safe for the speakers.
    And you should get a more powerful amp as it will have better sound reproduction at lower volumes also".

    I am a bit concerned that maybe Volume and Power are actually unrelated in this sense and I should worry about Resistance instead? maybe the speaker does not have a high enough Ohms for the Amp?

    So, if I am not using the amp at full capacity (?) and so if I hook up extra speakers (in series or parallel) it should handle them in terms of power and if the total resultant resistance (add for series, divide by 2 for parallel) does not exceed the recommended amount for the amp.
    Is this right or am I missing something?

    no need to say that I am completely green here.
    All help most appreciated
     

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