I'm trying to wire 6 headphone wall jacks in series from a stereo receivers speaker line output. I was given some bad advice to wire it this way, and it's too late to change it. I know it can be done but I'm unsure what type ans size of transformer to use. I'm using a Onkyo 8511 Stereo receiver with the speaker output at 8 oms.
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You'll have a lot more luck wiring them in parallel... but the effective resistance of 6 headphones in parallel may be too much for most stereos.
Calculate the effective resistance of all your headphones and see if it's within the range of what the stereo can handle (probably not far outside of 8 ohms).
Perhaps some form of mixer circuit would be better?
Wiring them in parallel is a bad idea because not all headphones have the same impedance.
Back to the originaly question, you can probably just hook them right up. Impedance ratings on amplifiers are just minimums. You can and do go well above 8 ohms every time you use your speakers. Tweekers are commonly in the 1Kohm range. If you still want to use a transformer, I suggest getting something with a 4:1 ratio like a 150/500 which is commonly available in audio transformers.
If you want to do it right, get a 600:10K transformer, and hook the output up to one of the common headphone amplifier IC's and then you can have your own volume control on each output.