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Active or passive ?

Discussion in 'Subwoofers' started by Ray, Feb 28, 2005.

  1. Ray

    Ray
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    Yet another newbie question I'm afraid. :rolleyes:

    I'm still in the planning stage for both room and system but was thinking of going with a canton system including the AS22 sub. As I'm not familiar with the sub connections can anyone tell me if the choice of active or passive will affect my choice of receiver and is there an advantage of one over the other ?

    Thanks

    Ray
     
  2. mhuk05

    mhuk05
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    Active. If you use passive you'll need an another amp.
     
  3. Ray

    Ray
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    Doesn't the LFE (?) output power the sub then ? What about on 7.1 amps ?

    Thanks

    Ray :)
     
  4. mhuk05

    mhuk05
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  5. Ray

    Ray
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    Mhuk05,

    Thanks for the links. Did try searching myself at first but couldn't find the answer (must remember to use the + sign in searches in the future!)

    Ray
     
  6. Iceman12

    Iceman12
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    I have both a active sub and a passive sub.The DSP 12 Velodyne is an active sub that is connected to the sub out on my Denon receiver.The passive sub is a Paradigm dual 12" sub that is connected to my receiver speaker terminals.I have a pair of Jamo speakers that I connect to the sub for my front speakers.The active sub has more power than the passive sub because it has it's own amp but passive sub helps give the front speakers a full bass tone.
     
  7. Reiner

    Reiner
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    The subwoofer output is line level, i.e. not amplified. Hence you need an active sub (or a passive sub plus a mono power amp). Typically the LFE is routed to the subwoofer output, as well as bass from all speakers that are configured as "SMALL".

    There is no difference in connectivity if this is a 5.1, 6.1 or 7.1 amp though in theory you could use a 7.1 amp with power re-routing feature to drive a 5.1 system plus 2 passive subs. Not all 7.1 amps do have this feature though.


    Otherwise a passive sub would be connected in parallel to the (front) speakers, though this will put additional stress on the amp and hence should be avoided, in particular if it's an underpowered (budget) AV amp/receiver.
     
  8. Nimby

    Nimby
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    Passive subs put a very low impedance load on the receiver or amplifier.
    I cooked one stereo amp and came close to cooking another with my two 8 ohm passive subs in parallel with my speakers. The cooling fins on the back of my first amp used to get red hot before it went very quiet. :mad:

    Proabably I should have fitted plate amps to them to drive them properly.

    I would strongly recommend the purchase of an active sub over a passive one. It also gives you lots of adjustements to play with on Saturday mornings into the bargain. :D

    Nimby
     
  9. Eddy Boy

    Eddy Boy
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    When you connected those subs together you would have made the total impendance 4 ohms propaply why they cooked the amp.
     
  10. Nimby

    Nimby
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    It was worse than that I think. :rolleyes:
    The subs were in parallel with Linn Kans which are notoriously difficult to drive. Probably nearer 2.5 - 3 Ohms impedance.
    I like my music loud as well! :devil:

    Regards
    Nimby
     
  11. Iceman12

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    When I listen to my system without the active sub on there is a huge difference in sound.The active sub helps drive the bass.It's very noticeable with dvd movies.The ending scene in the dvd Saving Private Ryan has alot of sub sound.With the passive sub you can hear the movements of the tanks and the explosions.When I switch on the active sub you can FEEL the action.I just purchased a Velodyne DSP 12 sub and it
    has a great sound.I would give it a try.Go with the active subwoofer.
     
  12. Ray

    Ray
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    Thanks for all the info guys :smashin: I have just purchased a Velodyne CHT10 :thumbsup:

    Cheers

    Ray
     
  13. Iceman12

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    Make sure you try your subwoofer in different areas of the room to find the sweet spot.I have mine in the front corner of my room.Also switch the phase
    to see where it sounds best.Velodyne makes a great sub.

    Enjoy!!

    Robbie
     
  14. Ray

    Ray
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    Still waiting for delivery :( but it doesn't matter as it's the only the 1st bit of my new AV kit so I've got nothing to hook it up to yet anyway :eek: (unless I sneek it into the front room and scare the next door neighbours.

    Hoping to get the rest of the sound kit and receiver in the next few weeks.

    What's the bit about switching phase about Iceman ? :confused:

    Ray
     
  15. Iceman12

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    This control allows you to reverse the phase of the subwoofers output signal.Listen to your system with music playing then move the switch from one postion to the other and listen for a change.The proper position will have a greater amount of bass.What type of receiver did you purchase?

    Robbie
     
  16. Ray

    Ray
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    Ok - I'll remember that. Still sussing out receivers/amps. Can't stretch to a 2805 but there's a 2nd hand 2803 in the classifieds so thinking about that. Also looking at the Yammy AX750SE - just over £300 in Germany .

    Ray
     
  17. Iceman12

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    2805 is that a Denon receiver?
     

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