|Originally posted by Cammo
I am currently building up my first HT and today I purchased a Pioneer VSX-912 A/V receiver and a Canton Movie 6 CX pack (5.1). I noticed in the Pioneer manual that the requirements are for 8 or 16 Ohm speaker impedance. However in the Canton manual it says "Speaker Impedance - 4...8 Ohm". Can anyone help with this? I assume it is ok but I thought I had better check. :rolleyes:
P.S Wasn't sure whether to post in Amps or Speakers so thought I'd try here first...
You need to match the capability of the amp / receiver to the speakers.
For a given voltage - it requires more current to flow through a low impedance than a
higher impedance. Thus 16 ohm speakers are the easiest to drive, 8 ohm speakers
are more difficult, and 4 ohm speakers are still more difficult to drive.
The most common speaker impedances are 4 ohm and 8 ohm, the latter the more common of the two.
The amp in you receiver doesn't have the current reserves to put out a lot of current -
hence it can't drive 4 ohm speakers at full output. As Larry states - the Pioneer is
ill suited to drive the Cantons.
However, Larry is also correct that if you keep the volume control low enough so that
don't tax the receiver - it will still play through those speakers.
However, if you crank up the volume - you could overtax the receiver - it won't be able
to deliver all the current required. If this happens, the receiver will "clip" the top off the
waveform - because it can't go up to the full voltage being asked of it because it ran out
of current into an impedance lower than it's rated for.
If this happens - you will hear distortion - a "crackly" quality to the sound. If this happens,
turn down the volume QUICK. If the amplifier clips - it produces distortion due to the
clipped wave - and this is real bad for speakers - it will fry the tweeters.
More speakers are destroyed by amps / receivers with too little power, or that can't drive
a too low impedance.
If it sounds OK - you're probably OK. But just be mindful that if you crank up the volume
control with that combination of receiver and speakers - you're flirting with the possibility
of frying the speakers. So be careful with that volume control.