Question about Sony STR-DB940 Receiver
I know the manual talks about 4 and 8 ohm speaker loads, but my question is how low the load impedance can safely go. Basically, I want to wire the center channel output to a pair of speakers hanging off my Pioneer PDP-5020FD plasma TV. I figured I would wire them in parallel. I measured the ohms of each speaker; one is 6.8 and one is 7, so in parallel it would be around 3.4. Is that a safe load? It's not much below 4 ohms, and I know many amps can handle down to 2 ohms, but I don't know if my receiver will. Please help. Thanks!
Whats the rating on the Plasma? How many watts at 4 ohms? If the plasma is rated 100 w at 8 ohm... hanging a 3.4 ohm load would put a lot of strain on the plasma's output amp. At 3.4 ohm the amp would be trying to delive close to 200 watts at full power. But it depends on how hot you normally run the volumn. Remember an amplifier output is AC volts. 1 ohm of resistance is close to a dead short. The amplifier would have to work its *** off to supply that type of power and would probably burn the output op-amps. If the outputs burn & it pumps any DC current through the speaker wire..the speakers would be toast...if not catch on fire. Try to keep the speaker load at or very cloe to the plasma's output load rating. Also if the plasma doesn't state it will handle loads down to 2 ohms...It probably won't.
Posted on Mar 03, 2009
Since the Sony receiver has preamp outputs for all channels, you could use the center channel preamp output to drive the existing amplifier in the television set. This will avoid concerns over speaker impedance and make the cabling simpler as well. By the way, if you measured the speaker "impedance" with a DC ohmmeter, you haven't actually measured impedance. DC resistance is a scalar quantity measured with an ohmmeter, but impedance is a vector quantity consisting of resistance and reactance.
Posted on Jan 11, 2010
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If you don't want to buy new speakers, settle for safer low volume levels.
You're going to kill that receiver driving a 3-ohm load. HTS-style speakers aren't reliably re-deployable to other electronics. Perhaps, if you have 4 speakers and they're similar you could wire them in SERIES and present a 6-ohm load to each channel.
Re-engineering the speakers themselves is, well, don't do it. It isn't rocket science but it also isn
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