Where can I obtain a free Owners Manual for a Pioneer VSX 505S Stereo Amplifier?
On the rear of the receiver are four (4) speaker cable inputs / outputs. The lower two have ceased to work. I would like to install two sets of speaker cables (Positive & Negative) in the remaining two (2) speaker cable inputs / outputs. However, I need to know how many ohms this receiver uses for each speaker cable that I plan on installing, so I can still listen to all 4-speakers in Stereo.
Audio Players & Recorders - Pioneer - VSX-505S Receiver
Answers & Comments
The support section of the Pioneer website would seem like a good place to begin and failing that I am sure you will find a specialist forum.
What you are proposing to do I think, is to connect two speakers to each of the two remaining working outputs.
Connecting two speakers in parallel will tend to make the amplifier think it is one speaker of a reduced impedance into which it will attempt to deliver more power for a given volume setting. If you like your music loud you could soon overload the output stages.
Connect two speakers if you like but if you don't want to stress your amp you should set the volume control to half of your usual setting, when you could discover your disatisfaction with the arrangement or if the amp is a well-designed tough unit you might just get away with it.
Alternatively, you could take it to the repair shop and get it fixed.
In the old days of valves hi-fi speakers were 15 ohm and the amps built to match. 8 ohm speakers were considered low-fi. Transistors arrived on the scene and 8 ohm became the hi-fi value almost universally with 4 ohm being the new low-fi. Amplifier specs were often quoted as 25 watts (peak) music power into 8 ohm or 50 watts (peak) music power into 4 ohm, for example.
It seemed transistor amps didn't care very much about exact matching just that they weren't overloaded. One advantage of the 4 ohm speaker is there is less back emf but that is an almost negligible advantage for domestic listening. My hi-fi speaker manual tells me 300milliwatts is the comfortable average listening power for the average domestic lounge so the difference would seem to be academic...
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