Ross Mega Amp 800

Discussion in 'rec.audio.pro' started by John R. Birkeland, Aug 29, 2003.

  1. I am trying to find out about the Ross Mega amp 800. I have the amp but do
    not have the owners manual. I want to use it in bridge mode powering two 8
    ohm speakers. that makes a resistance of 4 ohms. but the back panel of the
    amp says a minimum of 8 ohms in bridge.

    My question is, Will I damage the speakers if I bridge them to 8 ohms?


    --
    John & Kitty Birkeland
    From Macau China
  2. Scott Dorsey

    Scott Dorsey Guest

    John R. Birkeland <pfm@macau.ctm.net> wrote:
    >I am trying to find out about the Ross Mega amp 800. I have the amp but do
    >not have the owners manual. I want to use it in bridge mode powering two 8
    >ohm speakers. that makes a resistance of 4 ohms. but the back panel of the
    >amp says a minimum of 8 ohms in bridge.


    You bridge amplifiers when you need more voltage. What you need is more
    current, not more voltage.

    >My question is, Will I damage the speakers if I bridge them to 8 ohms?


    You'll damage the amp first, but you might take out the speakers in the
    process. Why not just run one speaker off each half of the amp, and
    run the same signal into each half? That way each side of the amp
    sees an 8 ohm load and it's happy, and the speaker sees a nice low-Z
    source and it's happy.
    --scott

    --
    "C'est un Nagra. C'est suisse, et tres, tres precis."
  3. Harvey Gerst

    Harvey Gerst Guest

    kludge@panix.com (Scott Dorsey) wrote:

    >John R. Birkeland <pfm@macau.ctm.net> wrote:
    >>I am trying to find out about the Ross Mega amp 800. I have the amp but do
    >>not have the owners manual. I want to use it in bridge mode powering two 8
    >>ohm speakers. that makes a resistance of 4 ohms. but the back panel of the
    >>amp says a minimum of 8 ohms in bridge.

    >
    >You bridge amplifiers when you need more voltage. What you need is more
    >current, not more voltage.
    >
    >>My question is, Will I damage the speakers if I bridge them to 8 ohms?


    >You'll damage the amp first, but you might take out the speakers in the
    >process. Why not just run one speaker off each half of the amp, and
    >run the same signal into each half? That way each side of the amp
    >sees an 8 ohm load and it's happy, and the speaker sees a nice low-Z
    >source and it's happy.
    >--scott


    The Mega 800 has current limiting protection built in, so it's unlikely you'll
    damage the amp by running in bridged mode at 4 ohms. Scott's suggestion makes a
    lot more sense though. The Mega 800 was the only decent amp Ross ever made, and
    we had a hell of a time keeping the builder from substituting whatever parts
    they had on hand to replace the required parts. Their motto seemed to be "If it
    physically fits, you can use it".

    Harvey Gerst
    Indian Trail Recording Studio
    http://www.ITRstudio.com/

Share This Page