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  1. #1
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    Default A question about power amps.

    I have 2 stereo power amps used for bi-amping,one amplifier dedicated for each speaker.One power supply feeds both the outputs of each amp(150 watts per channel).So since the bass drivers draw more power than the tweet/midrange section will the amp borrow more power from the power transformer (if needed) to drive the bass section than the advertised 150 watts?
    PS. I believe this is called Vertical bi-amping
    Last edited by rubin; 10-27-2009 at 03:26 PM.

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    Quote Originally Posted by rubin View Post
    will the amp borrow more power from the power transformer (if needed) to drive the bass section than the advertised 150 watts?
    It really depends on the amps and it's power supply design and how is the output RMS power is measured by the manufacturer. But you don't likely need to use full RMS power all the time (unless you are playing your music at concert hall levels) for bass reproductions. Bass requires a lot of dynamic power and the manufacture usually states the dynamic power (the maximum amount of power) for the amp.

    Let's say if your amp has 150W RMS power at 8 ohms, it may probably puts out a bit more than that but not much. But the dynamic power ratings may be 250W at 8 ohms. So, it means your amp can supply 250W to your woofers for a small amount of time. Most of the music has deep bass passages that are periodically demanding lots of power from an amp but not all the time (I think rap music and some classical are exceptional in this case).
    Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone.

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    Quote Originally Posted by megasat16 View Post
    It really depends on the amps and it's power supply design and how is the output RMS power is measured by the manufacturer. But you don't likely need to use full RMS power all the time (unless you are playing your music at concert hall levels) for bass reproductions. Bass requires a lot of dynamic power and the manufacture usually states the dynamic power (the maximum amount of power) for the amp.

    Let's say if your amp has 150W RMS power at 8 ohms, it may probably puts out a bit more than that but not much. But the dynamic power ratings may be 250W at 8 ohms. So, it means your amp can supply 250W to your woofers for a small amount of time. Most of the music has deep bass passages that are periodically demanding lots of power from an amp but not all the time (I think rap music and some classical are exceptional in this case).
    Well you got that one right on! The specs say 150 watts/channel...255 watts dynamic.So then if I switch to Horizontal bi-amping will the one amp driving the bass section of both speakers be strong enough?

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    What amp, what speakers and how you wired them for bi-amping? Vertical or Horizontal? You said Vertical Bi-amping (means one amp for bass region and one amp for tweeter region).

    By horizontal bi-amping you mean, you trying to use stereo amp with one channel for tweeter and one channel for bass? If your stereo amp shares the reservoir capacitors and power supply section for both channels, one channel for tweeter requires less power than the other channel for bass has more reserve power to use from transformer and power supply section (it may or may not make a difference in sound). But it'll be capped out at the maximum power quoted by the manufacturer since there are output devices limitations as well.

    If you use true dual mono amps as horizontal bi-amping, the power supplies and reservoir capacitors are no longer shared between two channels so it'll not make any difference how you used it (vertifcal or horizontal) and always be capped out at it's limit and no borrowing of power from another channel.

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