Help !!!

Discussion in 'Amps and Cabs [BG]' started by newborner, Sep 9, 2003.

  1. newborner


    Sep 9, 2003
    My band are getting together our own P.A. after recently finding ourselves with more gigs on the cards. We have acquired a couple of 300w speakers at 8 ohms and have the option of buying an amp. The amp however runs at 4 ohms. will this be a problem ??????? We understand very little on the subject and I'm hoping people her will.
  2. Amps do not "run" at any particular impedance. They deliver power to certain maximum levels when connected to a certain impedance.

    For example, you might find an amplifier rated at 350 watts into 4 ohms, 250 watts into 8 ohms, and a minimum impedance load specified as 2 ohms.

    Is the amplifier stereo or mono? If your speakers are 8 ohms each, and are connected in parallel to a mono output, they will show a 4 ohm load to the amplifier and you will get the power delivered at the 4 ohm rating for the amplifier. On the other hand, if you have a stereo amplifier rated at 'x' watts per channel into a 4 ohm load, it will likely deliver ~70% of that into an 8 ohm load on each channel.

    Also remember not to grossly underpower or overpower the speakers with your choice of amplifier. If each speaker is rated at 300 Watts, then the amp rating should be in the 250-400 watt range per channel (generally speaking). Hope this is clear.
  3. newborner


    Sep 9, 2003
    cheers. thats a great help and makes perfect sense. we were getting so disheartened by dodgy backstreet salesmen in stores trying to scam us but now im pretty sure we have it sorted. thanks again. Sam.