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impedance question

Hi I'm trying to understand ohm's and power. My b&k 200.5 is rated at 200 watts per channel at 8 ohms and 375 at 4 ohms. Now some of my speakers are rated 4 ohms and some are rated at 6 ohms. My question is does the amp just feed the power differently to each speaker accordingly? ie, 4 ohm speaker will receive 375 watts and the 6 ohm somewhere between 200-375?

2nd question is i had my sub woofer wired parrellel to my mains, everything seems to be working fine but I just read that I really put a load on my amp by dropping it to 2 ohm? is this correct? Is this a bad thing to do? I don't know how else to wire my sub because for some reason my rca sub output on my receiver doesn't seem to work. any suggestions?
monterey
almarg's avatar
almarg
9,670 posts
 
So can I attach my sub to my mains via a parallel connection safely?
Yes, given that it is a powered sub (i.e., it has its own built-in amplifier, and an AC power cord that plugs into a wall outlet), and given that the sub has provisions to accept speaker-level inputs from the outputs of the main power amplifier.

Regards,
-- Al
elevick
2,638 posts
 
Keep in mind that the 4 ohm speakers are most likely less efficient than the 6 ohms speakers (ie 85db vs 87db) so the increase in wattage output won't be as drastic as you think.
monterey OP
31 posts
 
Since I got your attention, what is the phase knob for on my sub and where should it be set at?
ahendler
416 posts
 
If the sub is in line with the speakers set at zero. If some other position experiment with the phase setting. Why don't you feed your sub from a line output from your pre to the high level or line inputs on your sub? It almost sounds like you do not have a self powered sub. Is this so?
monterey OP
31 posts
 
Hi it is a self powered sub. In fact 1500 watts!
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