Suspect a DTS board capacitor failures the ESR characteristics.
To troubleshoot connected any available device to RCA stereo connections at input to multi channel in. Test input to the corresponding speaker output confirming audio quality. This circuit bi-passes the DTS function and connects to the power amplifier for the speaker.
Connect any audio amplifier from the preamp out and confirm the quality of the audio.
I suspect that the pre-amp out will contain the distortedf noise. If the distrotion appears in all the channels it is most likely the DTS.
I think you're making this way more complex than it is.
This unit should have no trouble with any reputable speaker. Don't read too much into short term impedance readings as long as you run only one speaker per channel. Every speaker has a dip somewhere in its frequency range and the Pioneer will probably protect itself and the speaker should impedance or current get too out of whack. This is a high end unit and has plenty of clean power to feed any speakers out there.
I'd buy it if I didn't already have a 6-year old predecessor (VSX-T36TX) that I paid twice as much for and has only 5 amplified channels, less features and lower power output. ;-(
I would recommend checking your speakers polarity ( + on the + - on the - ). Also check to make sure the wires are not touching each other where they connect to the speaker or amp. Also check your input connections if you are not using HDMI or Optical. Worst case is you have to send it in to get serviced. Hope this helps
I am assuming the light that is flashig is the "MCCAC" light on the front display. Supposing this is correct you have either a blown amplifier (one or mor channels) is the protection circuitry is not operating correctly. In either case the receiver has locked up to prevent any additional damage. There is a key sequience that needs to be preformed to unlock the unit so a technician can troubleshoot the problem. In most cases a blown amplifier should be in the $150.00 dollar range to get repaired. This is a fairly high end Pioneer receiver and is probably worth repairing, or at least finding out what the repair will cost.
NOT HARD ...JUST FOLLOW THE DIRECTION TO THE BOARD THAT YOUARE REPLACING....IT WILL SAY WHAT THE BOARD AND WHAT IT CONTROLLS ...RIGHT ON IT....FIND IT ,REPLACE , PUT BACK TOGETHER......OOOOO MAKE SHURE YOU PUT THE SCREWS AND WIRES IN AN ORDER THAT YOU CAN REMEMBER....LABELING WITH TAPE HELPS FOR MEMORY....OK
I had the same problem only mine was VERY frequent (about twice/hour). I finally fixed it by taking off the cover and removing the MUTING button which I never used anyway. Remove the button that sticks through the front panel only - no wiring. The MUTING button is between the balance and volume controls. This reduced the problem from twice/hour to about once/year (we have it on severaly hours every day).
There are a few methods manufacturers use to automatically change the direction of play - sometimes a tight cassette will fool the mechanism into thinking the tape has ended and sometimes it is a matter of the internal control linkages being in such close proximity a slight misalignment can cause the pressing of one button to move another...