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RE: Onkyo A-8190 pre-outs?

Posted by Bold Eagle (A) on December 5, 2007 at 19:15:43

In Reply to: Onkyo A-8190 pre-outs? posted by joelongwood on December 5, 2007 at 14:47:50:

I have an A-8190 and the service manual with the schematic, so I can answer your question.

Those aren't really pre outs! Regardless of the labelling. What they are is the power amp output run through a voltage divider to bring the voltages back down to line level, as if it were a true preamp output.

As to use, it would be useful to drive a powered sub with a built in low pass filter, while the A-8190 power amp drives a full range speaker that's a little shy in the low bass. Otherwise, it's pretty useless.

The actual preamp on the A-8190 has a 100% passive line stage, including the tone controls, so it's very clean. The phono preamp is active, as it must be.

If you look through the grill in the cover, you'll see what looks like two power transformers. The one nearest the back is the tranny, the front one is an "true-phase" transformer and seems to be there to correct the power factor of the AC output from the main transformer.

It's a great integrated amp with the right speakers. The A-8190 is the model where Onkyo used all of their tricks.

I did change the speaker output connectors on mine to real 5-way binding posts on 3/4" centers. The ones Onkyo used only look like 5-ways and aren't on 3/4" centers. But that doesn't matter, because they won't accept dual banana plugs. Still sounds good though.

Jerry

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